Maize is one of our country quite important grain crops,its height output is an important pillar ensure that grain of our country is safe,if speedy science ascertaining that maize expediency area cultivating,it can pr...Maize is one of our country quite important grain crops,its height output is an important pillar ensure that grain of our country is safe,if speedy science ascertaining that maize expediency area cultivating,it can provide the most reliable decision-making reference to jobs such as agricultural regionalization,crop layout,accurate agriculture of essence.The article carries out a maize cultivating expediency research make use of the minute RS and GIS means,it can guarantee the results is timeliness and scientificalness.展开更多
[Objective] The research aimed at introducing the background and utilization of germplasm resources in maize.[Method] The research progress on genetic background and utilization of maize germplasm resources was compre...[Objective] The research aimed at introducing the background and utilization of germplasm resources in maize.[Method] The research progress on genetic background and utilization of maize germplasm resources was comprehensively reviewed in this paper,including maize heterotic groups and heterotic patterns,their flexible application in breeding and the utilization of various types of original materials.[Result] The results show that germplasm resource is the premise and basis for maize breeding.In-depth understanding and a reasonable selection of germplasm resources can significantly improve the breeding efficiency and speed up the breeding process.At the same time,it is considered that the selection and construction of original materials in maize breeding can not be limited to the heterotic groups and heterotic patterns,but has to be used reasonablely according to different types of germplasm resources and individual breeding objective and idea as well.[Conclusion] This study had broadened the idea and provided inspiration for the maize breeding practice in China.展开更多
[Objective] The aim was to study on effects of N fertilizer on yield, N absorption and utilization of different cultivars of super high-yielding summer maize, in order to provide reference for reasonable N fertilizati...[Objective] The aim was to study on effects of N fertilizer on yield, N absorption and utilization of different cultivars of super high-yielding summer maize, in order to provide reference for reasonable N fertilization in accordance with different cultivars. [Method] Field experiment was conducted to study on effects of different N fertilizers on yield, N absorption and use efficiency of Zhengdan 958 and Xundan 20, in order to learn the effect differences at different N fertilizer levels. [Result] After N was applied, yields of the two summer maize increased significantly. Zhengdan 958 achieved the highest in yield and proceeds at 12 051.18 kg/hm2 and 1 722.40 yuan/hm2, respectively in low N level. In contrast, Xundan 20 achieved the highest at 13 166.00 kg/hm2 and 1 343.92 yuan/hm2 in the above two aspects in high N level. Compared with Zhengdan 958, Xundan 20 increased by 9.90%, 5.20% and 12.00% in N levels of 0, 240, and 450 kg/hm2, respectively. When N fertilizers were applied, protein yield of Xundan 20 was significantly higher than that of Zhengdan 958, so that higher N fertilizers contributed higher protein yield for Xundan 20. In high N level, N efficiency, N-fertilizer utilization and partial productivity of Xundan 20 were significantly higher than that of Zhengdan 958. [Conclusion] Lower N-fertilizer was suitable for Zhengdan 958 and Xundan 20 would get a good harvest if more N-fertilizers were applied. The results provided references for reasonable N fertilization.展开更多
[Objective] The study was to explore the molecular interpretation standards on parentage in the seeds of corn variety. [Method] With 16 hybrids and their parents and 202 inbred elites as materials for screening primer...[Objective] The study was to explore the molecular interpretation standards on parentage in the seeds of corn variety. [Method] With 16 hybrids and their parents and 202 inbred elites as materials for screening primers, the artificial groups of two standard diad and two standard triad were respectively established as the verification materials. Genomic DNA of seedlings was extracted by using CTAB method. 137 pairs of SSR primers were selected for SSR amplification and product detection, which was used for the parentage identification of maize varieties. [ Result] Twenty pairs of corn primers with high polymorphism information content ( PIC value), clearly amplified bands and good reproducibility were screened from 137 pairs of corn SSR primers tested. The identification results of using SSR molecular were consistent with the actual situation. [ Conclusion] It is feasible to identify the parentage of maize variety using SSR markers.展开更多
Genetic diversity of 54 maize landraces from southwest China was tested using bulk DNA samples and 42 microsatellite (SSR) loci distributed on 10 chromosomes of maize. A total of 256 alleles were detected among the ...Genetic diversity of 54 maize landraces from southwest China was tested using bulk DNA samples and 42 microsatellite (SSR) loci distributed on 10 chromosomes of maize. A total of 256 alleles were detected among the landraces. At each locus, the number of alleles varied from 2 to 9, with an average of 6.1. On the basis of the genetic similarity coefficients, clustering analysis separated the landraces into four groups. The landraces collected from the same region were mostly grouped together. To reveal the genetic structure and genetic diversity within landraces, 165 individuals from 11 landraces were analyzed. Individual DNA samples proved to be superior to bulk DNA samples in identifying genetic diversity of landraces. A total of 330 alleles were detected in the 11 landraces. According to the results of the individual DNA sampling analysis, estimates of the mean number of alleles ‘A’, the effective allelic number ‘Ae’, the observed heterozygosity ‘Ho’, and expected heterozygosity ‘He’ were 7.86, 3.90, 0.69, and 0.37, respectively. An obvious genetic deviation from Hardy-Weinberg expectation was observed both among and within landraces and a considerable genetic variation was revealed within rather than among landraces. In addition, genetic diversity of landraces was greater in Sichuan than in the other three regions. It can be concluded that maize landraces in southwest China were initially introduced to Sichuan and from there to adjacent areas.展开更多
Haploid seedlings were inducted from different maize materials.At 2-3-leaf stage,maize haploids were treated with 0.06% colchicine and 2.0% dimethyl sulfoxide(DMSO) by dipping root,dripping heart leaf and acupunctur...Haploid seedlings were inducted from different maize materials.At 2-3-leaf stage,maize haploids were treated with 0.06% colchicine and 2.0% dimethyl sulfoxide(DMSO) by dipping root,dripping heart leaf and acupuncturing growing point,respectively.The doubling rate and mortality rate in different treatments were analyzed by variance analysis and multiple comparisons.The result showed that growing point acupuncturing method exhibited the highest doubling efficiency with an average doubling rate of 23%,seed-setting rate of 21.4%,and mortality rate of 16.3%.Composed with other two chemical doubling methods,growing point acupuncturing method significantly improved the doubling rate of maize haploids with a lower application dose of colchicine.This study laid the foundation for industrial application of haploid breeding techniques.展开更多
Referring to corn breeding literature at home and abroad,the possible ways to improve the efficiency of maize breeding were discussed.The results showed that through the summary and reflection on breeding objectives a...Referring to corn breeding literature at home and abroad,the possible ways to improve the efficiency of maize breeding were discussed.The results showed that through the summary and reflection on breeding objectives and strategies,and improvement and optimization of breeding techniques and methods,as well as adjustment and simplification of experimental design and implementation,the breeding cost would be greatly reduced,and the breeding efficiency would be improved.展开更多
Elite maize hybrid Guidan0810 was selected as material, and the effects of fertilizing level and planting densities on yield and nitrogen utilization were dis- cussed in the study. In field experiments as per double-c...Elite maize hybrid Guidan0810 was selected as material, and the effects of fertilizing level and planting densities on yield and nitrogen utilization were dis- cussed in the study. In field experiments as per double-cropping system, 4 main plots (fertilization levels) and 6 subplots (planting densities) were set in a split plot design. The results suggested that yield had close relationship with fertilization levels and planting densities. Different fertilization levels and planting densities significantly affected yield. With the increase of nitrogen fertilization, nitrogen use efficiency, nitrogen agronomic efficiency and nitrogen physiological efficiency declined. Under the same fertilization level, nitrogen use efficiency, nitrogen agronomic efficiency and nitrogen physiological efficiency grew a little with the increase of planting density, so nitrogen efficiency could be improved by regulating planting density. The results also showed that A2 (including N 225.0 kg/hm2, P205 75.0 kg/hm^2, K20 187.5 kg/hm^2) matching to B3 (52 500 plants/hm^2) or B4(60 000 plants/hm^2) was a better design, which could obtain a higher yield in the range of 7 913.2-8 207.8 kg/hm2, respectively.展开更多
Liangtianzi 1 was used as a material to study the effects of transplanting density on the yield formation characteristics of purple rice. The results showed that the whole growth period of Liangtianzi 1 was 146 d. Its...Liangtianzi 1 was used as a material to study the effects of transplanting density on the yield formation characteristics of purple rice. The results showed that the whole growth period of Liangtianzi 1 was 146 d. Its biomass yield was above 10 t/hm^2, while its economic yield was only about 3 t/hm^2. Transplanting density had a large impact on the number of effective panicles, number of grains par panicle, seed setting rate and yield of purple rice variety. In this study, the planting spacing of 20.0 cm × 20.0 cm gained the highest yield, 3.63 t/hm^2. Key techniques for high-yielding cultivation of Liangtianzi 1 remain to further research.展开更多
In this study, maize plant seedlings were grown in soilless cultures, with and without ^-B radiation at a close of 5.4 kJt(m2-d). Three clays later, it was found that the treatment of UV-B radiation significantly re...In this study, maize plant seedlings were grown in soilless cultures, with and without ^-B radiation at a close of 5.4 kJt(m2-d). Three clays later, it was found that the treatment of UV-B radiation significantly reduced such characteristics as biomass, plant height, leaf area, and so on. Also, the photosynthesis of the maize was inhabited, the anti-oxid activity decreased, and the MDA concentration increased with the UV-B radiation exposure. The maize presented visible hybrid vigor under the control condition, while the hybrid vigor under UV-B radiation barely emerged in biomass, plant height, leaf area, and physiological metabolic index.展开更多
The greenness (SPAD) of uneven-aged leaves of dominant species in the Castanopsis carlessi forest at different altitude gradients in Lingshishan National Forest Park, Fujian Province, China were measured by using po...The greenness (SPAD) of uneven-aged leaves of dominant species in the Castanopsis carlessi forest at different altitude gradients in Lingshishan National Forest Park, Fujian Province, China were measured by using portable chlorophyll meter SPAD-502. In addition, the correlation between SPAD value and the concentration of chlorophyll and foliar nitrogen was also investigated. Significant variations in SPAD values were found between the uneven-aged leaves of different dominant species and different altitude gradients. Regression analysis showed that SPAD value was significantly correlated with the concentration of chlorophyll and the content of foliar nitrogen, indicating that SPAD value could be indicators for foliar chlorophyll and nitrogen. It is suggested that SPAD meter is a useful tool for forest assessments in decision-making and operational nutrient management programs.展开更多
This article summarizes the research progress inthe breeding of maize haploids, including the production and identification of maize haploids, especially the methods to produce doubled haploids and the selection of ba...This article summarizes the research progress inthe breeding of maize haploids, including the production and identification of maize haploids, especially the methods to produce doubled haploids and the selection of basic materials, as well as the applications of the maize haploids in maize breeding. Finally, this article pro- poses several issues researchers should pay attention to, and the prospects of hap- Ioids in maize breeding.展开更多
To reveal the genetic diversity of maize germplasm resources in Guizhou Province, we screened 20 pairs of SSR primers out of 100 pairs tested for amplify-ing the al eles in 21 shares of maize germplasm col ected there...To reveal the genetic diversity of maize germplasm resources in Guizhou Province, we screened 20 pairs of SSR primers out of 100 pairs tested for amplify-ing the al eles in 21 shares of maize germplasm col ected there. Total y 85 al eles were identified from the experimental materials, and each primer pair amplified 2-9 al eles, with an average of 4.25. The polymorphism information content (PIC) values varied from 0.19 to 0.74, with an average of 0.50. The clustering analysis by UPG-MA indicated that the genetic distance among the tested lines was 0.22-0.63, with an average of 0.43. This provided the theoretical foundations for establishing the finger print chromatogram of maize, further for exploring and utilizing maize germplasms Guizhou Province.展开更多
The study was conducted to evaluate 12 traits of 15 hybrid maize culti- vars using multi-factor comprehensive appraisal. The results showed that Xianyu 335, ND8 and ND2 were better than other cultivars in these agrono...The study was conducted to evaluate 12 traits of 15 hybrid maize culti- vars using multi-factor comprehensive appraisal. The results showed that Xianyu 335, ND8 and ND2 were better than other cultivars in these agronomic traits. Multi- factor comprehensive appraisal with simple computing, comprehensive and reason- able results is suitable to be used for evaluating the performance of hybrid maize cultivars in field.展开更多
Variety identification is important for maize breeding, processing and trade. The computer vision technique has been widely applied to maize variety identification. In this paper, computer vision technique has been su...Variety identification is important for maize breeding, processing and trade. The computer vision technique has been widely applied to maize variety identification. In this paper, computer vision technique has been summarized from the following technical aspects including image acquisition, image processing, characteristic parameter extraction, pattern recognition and programming softwares. In addition, the existing problems during the application of this technique to maize variety identification have also been analyzed and its development tendency is forecasted.展开更多
The effects of interspecific competition on the population dynamics of four insect grain Insecp pests ( Sitophilus zeamais, Rhizopertha dominica, Tribolium castaneum and Cryptolestes ferrugineus ) was studied at 30...The effects of interspecific competition on the population dynamics of four insect grain Insecp pests ( Sitophilus zeamais, Rhizopertha dominica, Tribolium castaneum and Cryptolestes ferrugineus ) was studied at 30℃, 75% relative humidity. A regression analysis of the population dynamics was conducted. The results showed that population growth of S. zeamais , R. dominica, T. castaneum and C. ferrugineus was restrained under mixed rearing. Population growth of T. castaneum and C. ferrugineus was remarkably accelerated when they coexisted with S. zeamais or R. dominica, while that of S. zeamais and R. dominica was restrained to some extent. Regression analysis results showed that the population growth potential of S. zeamais was the largest and that of C. ferrugineus was the smallest, and the changing trends of population growth rates were not distinct.展开更多
The research explored adaptability maize seed coating agent in spring sowing and effects of ultra-fine powder shaped areas in northeast China. The results showed that germination potential and rate both improved aroun...The research explored adaptability maize seed coating agent in spring sowing and effects of ultra-fine powder shaped areas in northeast China. The results showed that germination potential and rate both improved around 5% and the num- ber of root increased by 4% in the treatments with ultra-fine powder shaped maize seed coating agent compared with the control group without seed coating. What's more, the treatments with ultra-fine powder shaped maize seed coating agent took advantages in terms of fresh weight of seeding, stem diameter, and dry weight. It is notable that control effects on underground insects performed the best, with per- centage over 94%, which is more excellent relative to other agents in markets. Therefore, ultra-fine powder shaped maize seed coating agent can be widely applied in spring sowing areas in northeast China, without side effects.展开更多
Nuoda 1 is a high-yield and high-quality hybrid maize variety with multiple resistances, which is bred by Shandong Academy of Agricultural Sciences. Its female parent is Lx6958 and male parent is H318. In 2013, Nuoda ...Nuoda 1 is a high-yield and high-quality hybrid maize variety with multiple resistances, which is bred by Shandong Academy of Agricultural Sciences. Its female parent is Lx6958 and male parent is H318. In 2013, Nuoda 1 was approved by the Crop Variety Approval Committee of Shandong Province. In the regional trial of maize variety in Shandong Province from 2010 to 2011, the average yield within two years was 8 862.0 kg/hm^2, which enhanced by 4.0% compared with the control Zhengdan 958. In 2012, average yield of production test was 10 119.0 kg/hm^2, which enhanced by 4.4%. Nuoda 1 was introduced in the research from the aspects of characteristics, breeding foundation and breeding process.展开更多
By field experiments with Uniform Design, the effects of planting density and nitrogen rate on three varieties (Yunrui No.8, Yunrui No.6 and Yunrui No.88) grain yield under different ecological conditions were studi...By field experiments with Uniform Design, the effects of planting density and nitrogen rate on three varieties (Yunrui No.8, Yunrui No.6 and Yunrui No.88) grain yield under different ecological conditions were studied in Yunnan Province. The results showed that the grain yields were different among the five experiment locations, when increasing of planting density, it did not affected the plant height, ear height and ear factor, with the planting density increased, stem diameter, leaf width, ear length, number of grains per row and 1 000-grain weight decreased sig- nificantly, but the grain yield of the third varieties increased. High planting density had a negative impact on ear traits, but the grain yield increased by high-density compensate for the adverse effects.Control space and time of fertilizer application can reach the highest yield under less Nitrogen fertilizer Yunrui 88 had the charec- teristics of wide range of adaptability and the density-tolerance, high-yielding poten- tial, which was favorable in planting on large areas.展开更多
文摘Maize is one of our country quite important grain crops,its height output is an important pillar ensure that grain of our country is safe,if speedy science ascertaining that maize expediency area cultivating,it can provide the most reliable decision-making reference to jobs such as agricultural regionalization,crop layout,accurate agriculture of essence.The article carries out a maize cultivating expediency research make use of the minute RS and GIS means,it can guarantee the results is timeliness and scientificalness.
基金Supported by National Key Technology R&D Program(2007BAD69B05)~~
文摘[Objective] The research aimed at introducing the background and utilization of germplasm resources in maize.[Method] The research progress on genetic background and utilization of maize germplasm resources was comprehensively reviewed in this paper,including maize heterotic groups and heterotic patterns,their flexible application in breeding and the utilization of various types of original materials.[Result] The results show that germplasm resource is the premise and basis for maize breeding.In-depth understanding and a reasonable selection of germplasm resources can significantly improve the breeding efficiency and speed up the breeding process.At the same time,it is considered that the selection and construction of original materials in maize breeding can not be limited to the heterotic groups and heterotic patterns,but has to be used reasonablely according to different types of germplasm resources and individual breeding objective and idea as well.[Conclusion] This study had broadened the idea and provided inspiration for the maize breeding practice in China.
基金Supported by Cooperation project of International Plant Nutrition Institution(IPNI)(NMBF-HenanAU-2007)Special Fund for Construction of National Modern Maize Industrial Technology System(nycytx-02-17)~~
文摘[Objective] The aim was to study on effects of N fertilizer on yield, N absorption and utilization of different cultivars of super high-yielding summer maize, in order to provide reference for reasonable N fertilization in accordance with different cultivars. [Method] Field experiment was conducted to study on effects of different N fertilizers on yield, N absorption and use efficiency of Zhengdan 958 and Xundan 20, in order to learn the effect differences at different N fertilizer levels. [Result] After N was applied, yields of the two summer maize increased significantly. Zhengdan 958 achieved the highest in yield and proceeds at 12 051.18 kg/hm2 and 1 722.40 yuan/hm2, respectively in low N level. In contrast, Xundan 20 achieved the highest at 13 166.00 kg/hm2 and 1 343.92 yuan/hm2 in the above two aspects in high N level. Compared with Zhengdan 958, Xundan 20 increased by 9.90%, 5.20% and 12.00% in N levels of 0, 240, and 450 kg/hm2, respectively. When N fertilizers were applied, protein yield of Xundan 20 was significantly higher than that of Zhengdan 958, so that higher N fertilizers contributed higher protein yield for Xundan 20. In high N level, N efficiency, N-fertilizer utilization and partial productivity of Xundan 20 were significantly higher than that of Zhengdan 958. [Conclusion] Lower N-fertilizer was suitable for Zhengdan 958 and Xundan 20 would get a good harvest if more N-fertilizers were applied. The results provided references for reasonable N fertilization.
基金Supported by the National Standard Plan(20051079-T-469)~~
文摘[Objective] The study was to explore the molecular interpretation standards on parentage in the seeds of corn variety. [Method] With 16 hybrids and their parents and 202 inbred elites as materials for screening primers, the artificial groups of two standard diad and two standard triad were respectively established as the verification materials. Genomic DNA of seedlings was extracted by using CTAB method. 137 pairs of SSR primers were selected for SSR amplification and product detection, which was used for the parentage identification of maize varieties. [ Result] Twenty pairs of corn primers with high polymorphism information content ( PIC value), clearly amplified bands and good reproducibility were screened from 137 pairs of corn SSR primers tested. The identification results of using SSR molecular were consistent with the actual situation. [ Conclusion] It is feasible to identify the parentage of maize variety using SSR markers.
基金This work was supported by the National High Technology Research and Development Program of China (No. 2004BA525B04)Changjiang Scholars and Innovative Research Team in University (No. IRTO453).
文摘Genetic diversity of 54 maize landraces from southwest China was tested using bulk DNA samples and 42 microsatellite (SSR) loci distributed on 10 chromosomes of maize. A total of 256 alleles were detected among the landraces. At each locus, the number of alleles varied from 2 to 9, with an average of 6.1. On the basis of the genetic similarity coefficients, clustering analysis separated the landraces into four groups. The landraces collected from the same region were mostly grouped together. To reveal the genetic structure and genetic diversity within landraces, 165 individuals from 11 landraces were analyzed. Individual DNA samples proved to be superior to bulk DNA samples in identifying genetic diversity of landraces. A total of 330 alleles were detected in the 11 landraces. According to the results of the individual DNA sampling analysis, estimates of the mean number of alleles ‘A’, the effective allelic number ‘Ae’, the observed heterozygosity ‘Ho’, and expected heterozygosity ‘He’ were 7.86, 3.90, 0.69, and 0.37, respectively. An obvious genetic deviation from Hardy-Weinberg expectation was observed both among and within landraces and a considerable genetic variation was revealed within rather than among landraces. In addition, genetic diversity of landraces was greater in Sichuan than in the other three regions. It can be concluded that maize landraces in southwest China were initially introduced to Sichuan and from there to adjacent areas.
文摘Haploid seedlings were inducted from different maize materials.At 2-3-leaf stage,maize haploids were treated with 0.06% colchicine and 2.0% dimethyl sulfoxide(DMSO) by dipping root,dripping heart leaf and acupuncturing growing point,respectively.The doubling rate and mortality rate in different treatments were analyzed by variance analysis and multiple comparisons.The result showed that growing point acupuncturing method exhibited the highest doubling efficiency with an average doubling rate of 23%,seed-setting rate of 21.4%,and mortality rate of 16.3%.Composed with other two chemical doubling methods,growing point acupuncturing method significantly improved the doubling rate of maize haploids with a lower application dose of colchicine.This study laid the foundation for industrial application of haploid breeding techniques.
基金Supported by National Science and Technology Support Program(2007BAD69B05)~~
文摘Referring to corn breeding literature at home and abroad,the possible ways to improve the efficiency of maize breeding were discussed.The results showed that through the summary and reflection on breeding objectives and strategies,and improvement and optimization of breeding techniques and methods,as well as adjustment and simplification of experimental design and implementation,the breeding cost would be greatly reduced,and the breeding efficiency would be improved.
文摘Elite maize hybrid Guidan0810 was selected as material, and the effects of fertilizing level and planting densities on yield and nitrogen utilization were dis- cussed in the study. In field experiments as per double-cropping system, 4 main plots (fertilization levels) and 6 subplots (planting densities) were set in a split plot design. The results suggested that yield had close relationship with fertilization levels and planting densities. Different fertilization levels and planting densities significantly affected yield. With the increase of nitrogen fertilization, nitrogen use efficiency, nitrogen agronomic efficiency and nitrogen physiological efficiency declined. Under the same fertilization level, nitrogen use efficiency, nitrogen agronomic efficiency and nitrogen physiological efficiency grew a little with the increase of planting density, so nitrogen efficiency could be improved by regulating planting density. The results also showed that A2 (including N 225.0 kg/hm2, P205 75.0 kg/hm^2, K20 187.5 kg/hm^2) matching to B3 (52 500 plants/hm^2) or B4(60 000 plants/hm^2) was a better design, which could obtain a higher yield in the range of 7 913.2-8 207.8 kg/hm2, respectively.
基金Supported by Hunan Pilot Project of the Remediation of Farmland Polluted by Heavy Metals and the Adjustment of Crop Planting Structure(2016)~~
文摘Liangtianzi 1 was used as a material to study the effects of transplanting density on the yield formation characteristics of purple rice. The results showed that the whole growth period of Liangtianzi 1 was 146 d. Its biomass yield was above 10 t/hm^2, while its economic yield was only about 3 t/hm^2. Transplanting density had a large impact on the number of effective panicles, number of grains par panicle, seed setting rate and yield of purple rice variety. In this study, the planting spacing of 20.0 cm × 20.0 cm gained the highest yield, 3.63 t/hm^2. Key techniques for high-yielding cultivation of Liangtianzi 1 remain to further research.
基金Supported by the Special Fund for the Industrial Technology System Construction of Modern Agriculture(CARS-11-B-11)Standardization Cultivation Technology Research and Development in Sweet Potato(2014CXZ05-3)~~
文摘In this study, maize plant seedlings were grown in soilless cultures, with and without ^-B radiation at a close of 5.4 kJt(m2-d). Three clays later, it was found that the treatment of UV-B radiation significantly reduced such characteristics as biomass, plant height, leaf area, and so on. Also, the photosynthesis of the maize was inhabited, the anti-oxid activity decreased, and the MDA concentration increased with the UV-B radiation exposure. The maize presented visible hybrid vigor under the control condition, while the hybrid vigor under UV-B radiation barely emerged in biomass, plant height, leaf area, and physiological metabolic index.
基金supported by National Natural Science Foundation of China (No: 30671664)
文摘The greenness (SPAD) of uneven-aged leaves of dominant species in the Castanopsis carlessi forest at different altitude gradients in Lingshishan National Forest Park, Fujian Province, China were measured by using portable chlorophyll meter SPAD-502. In addition, the correlation between SPAD value and the concentration of chlorophyll and foliar nitrogen was also investigated. Significant variations in SPAD values were found between the uneven-aged leaves of different dominant species and different altitude gradients. Regression analysis showed that SPAD value was significantly correlated with the concentration of chlorophyll and the content of foliar nitrogen, indicating that SPAD value could be indicators for foliar chlorophyll and nitrogen. It is suggested that SPAD meter is a useful tool for forest assessments in decision-making and operational nutrient management programs.
基金Supported by Key Science and Technology Research and Development Program of Anhui Province(1604a0702021)Seed Program of Anhui Academy of Agricultural Sciences(16D0911)+1 种基金the General Program of Special Foundation of the President of Anhui Academy of Agricultural Sciences for Young Scholars(16B0916,14B0946)Discipline Construction Program of Anhui Academy of Agricultural Sciences(14A0925)
文摘This article summarizes the research progress inthe breeding of maize haploids, including the production and identification of maize haploids, especially the methods to produce doubled haploids and the selection of basic materials, as well as the applications of the maize haploids in maize breeding. Finally, this article pro- poses several issues researchers should pay attention to, and the prospects of hap- Ioids in maize breeding.
基金Supported by Special Fund of Guizhou Academy of Agricultural Science[2X(2007)004]~~
文摘To reveal the genetic diversity of maize germplasm resources in Guizhou Province, we screened 20 pairs of SSR primers out of 100 pairs tested for amplify-ing the al eles in 21 shares of maize germplasm col ected there. Total y 85 al eles were identified from the experimental materials, and each primer pair amplified 2-9 al eles, with an average of 4.25. The polymorphism information content (PIC) values varied from 0.19 to 0.74, with an average of 0.50. The clustering analysis by UPG-MA indicated that the genetic distance among the tested lines was 0.22-0.63, with an average of 0.43. This provided the theoretical foundations for establishing the finger print chromatogram of maize, further for exploring and utilizing maize germplasms Guizhou Province.
基金Supported by the Fund of Development and Industrialization of New Maize Cultivar 702(131100110100)~~
文摘The study was conducted to evaluate 12 traits of 15 hybrid maize culti- vars using multi-factor comprehensive appraisal. The results showed that Xianyu 335, ND8 and ND2 were better than other cultivars in these agronomic traits. Multi- factor comprehensive appraisal with simple computing, comprehensive and reason- able results is suitable to be used for evaluating the performance of hybrid maize cultivars in field.
基金Special Fund for Science & Technology Research of Education Commission,Chongqing(KJ101302)~~
文摘Variety identification is important for maize breeding, processing and trade. The computer vision technique has been widely applied to maize variety identification. In this paper, computer vision technique has been summarized from the following technical aspects including image acquisition, image processing, characteristic parameter extraction, pattern recognition and programming softwares. In addition, the existing problems during the application of this technique to maize variety identification have also been analyzed and its development tendency is forecasted.
基金重庆市科委攻关项目(CSTC,2004A C 1003) 重庆市教委科学技术研究资助项目(KJ030204)~~
文摘The effects of interspecific competition on the population dynamics of four insect grain Insecp pests ( Sitophilus zeamais, Rhizopertha dominica, Tribolium castaneum and Cryptolestes ferrugineus ) was studied at 30℃, 75% relative humidity. A regression analysis of the population dynamics was conducted. The results showed that population growth of S. zeamais , R. dominica, T. castaneum and C. ferrugineus was restrained under mixed rearing. Population growth of T. castaneum and C. ferrugineus was remarkably accelerated when they coexisted with S. zeamais or R. dominica, while that of S. zeamais and R. dominica was restrained to some extent. Regression analysis results showed that the population growth potential of S. zeamais was the largest and that of C. ferrugineus was the smallest, and the changing trends of population growth rates were not distinct.
基金Supported by Key Projects in the National Science&Technology Pillar Program~~
文摘The research explored adaptability maize seed coating agent in spring sowing and effects of ultra-fine powder shaped areas in northeast China. The results showed that germination potential and rate both improved around 5% and the num- ber of root increased by 4% in the treatments with ultra-fine powder shaped maize seed coating agent compared with the control group without seed coating. What's more, the treatments with ultra-fine powder shaped maize seed coating agent took advantages in terms of fresh weight of seeding, stem diameter, and dry weight. It is notable that control effects on underground insects performed the best, with per- centage over 94%, which is more excellent relative to other agents in markets. Therefore, ultra-fine powder shaped maize seed coating agent can be widely applied in spring sowing areas in northeast China, without side effects.
文摘Nuoda 1 is a high-yield and high-quality hybrid maize variety with multiple resistances, which is bred by Shandong Academy of Agricultural Sciences. Its female parent is Lx6958 and male parent is H318. In 2013, Nuoda 1 was approved by the Crop Variety Approval Committee of Shandong Province. In the regional trial of maize variety in Shandong Province from 2010 to 2011, the average yield within two years was 8 862.0 kg/hm^2, which enhanced by 4.0% compared with the control Zhengdan 958. In 2012, average yield of production test was 10 119.0 kg/hm^2, which enhanced by 4.4%. Nuoda 1 was introduced in the research from the aspects of characteristics, breeding foundation and breeding process.
文摘By field experiments with Uniform Design, the effects of planting density and nitrogen rate on three varieties (Yunrui No.8, Yunrui No.6 and Yunrui No.88) grain yield under different ecological conditions were studied in Yunnan Province. The results showed that the grain yields were different among the five experiment locations, when increasing of planting density, it did not affected the plant height, ear height and ear factor, with the planting density increased, stem diameter, leaf width, ear length, number of grains per row and 1 000-grain weight decreased sig- nificantly, but the grain yield of the third varieties increased. High planting density had a negative impact on ear traits, but the grain yield increased by high-density compensate for the adverse effects.Control space and time of fertilizer application can reach the highest yield under less Nitrogen fertilizer Yunrui 88 had the charec- teristics of wide range of adaptability and the density-tolerance, high-yielding poten- tial, which was favorable in planting on large areas.