[Objective] This study was to investigate the effect of atrazine stress on the growth of Pennisetum hydridum. [Method] Pot experiments were conducted to study the effects of atrazine stress （20, 50, 100, 200, 500 mg...[Objective] This study was to investigate the effect of atrazine stress on the growth of Pennisetum hydridum. [Method] Pot experiments were conducted to study the effects of atrazine stress （20, 50, 100, 200, 500 mg/kg） on plant height, biomass, root-shoot ratio and chlorophyll content of P. hydridum. [Results] Low level of atrazine stress （20 and 50 mg/kg） showed no significant effects on plant height and biomass of P. hydridum. Moderate level of atrazine stress （100 and 200 mg/kg） did not show significant effect on plant height, but did on the biomass of P. hydridum. Biomass of P. hydridum stressed by 100 and 200 mg/kg of atrazine was decreased by 34.1% and 36.4% compared with control, respectively. High level of atrazine stress （500 mg/kg） brought significant decrease in plant height（by 40.6%） and biomass（20.0%） of P. hydridum. All levels of atrazine stress showed no significant effects on root-shoot ratio and chlorophyll content of P. hydridum. [Conclusion] Pennisetum hydridum has strong tolerance to atrazine stress.展开更多
[Objective] The aim of this study was to extract effective feature bands of damaged rice leaves by planthoppers to make identification and classification rapidly from great amounts of imaging spectral data. [Method] T...[Objective] The aim of this study was to extract effective feature bands of damaged rice leaves by planthoppers to make identification and classification rapidly from great amounts of imaging spectral data. [Method] The experiment, using multi-spectral imaging system, acquired the multi-spectral images of damaged rice leaves from band 400 to 720 nm by interval of 5 nm. [Result] According to the principle of band index, it was calculated that the bands at 515, 510, 710, 555, 630, 535, 505, 530 and 595 nm were having high band index value with rich information and little correlation. Furthermore, the experiment used two classification methods and calcu-lated the classification accuracy higher than 90.00% for feature bands and ful bands of damaged rice leaves by planthoppers respectively. [Conclusion] It can be con-cluded that these bands can be considered as effective feature bands to identify damaged rice leaves by planthoppers quickly from a large scale of crops.展开更多
Salt is a major environmental stressor for crops.MicroRNAs(miRNAs)play a crucial role in plant response to salt stress.In this study,a comparative analysis of miRNAs between salt-tolerant and salt-sensitive jute subje...Salt is a major environmental stressor for crops.MicroRNAs(miRNAs)play a crucial role in plant response to salt stress.In this study,a comparative analysis of miRNAs between salt-tolerant and salt-sensitive jute subjected to high salinity were carried out.374 known mature miRNAs were identified and 87 potential miRNA candidates from the eight sRNA libraries were predicted.For the salt-stressed versus the control,181 miRNAs including 45 novel miRNAs were differentially expressed.More differentially expressed miRNAs were present in TC(salt tolerant)than in NY(salt sensitive).Among NY,58 and 27 differentially expressed miRNAs were discovered in leaves and roots,respectively,whereas among TC,45 and 113 differentially expressed miRNAs were discovered in leaves and roots,respectively.Two common differentially expressed miRNAs were discovered in both leaves and roots of the two genotypes.10 differentially expressed miRNAs were common across both leaves and roots only in TC,including 6 upregulated,3 downregulated and one both up and down-regulated miRNA.The results obtained in this analysis contribute to an improved understanding of abiotic-stress tolerance in jute and will be useful for breeding programs to improve jute productivity in soils with high salinity.展开更多
Salt and low temperature were both very important factors for soybean production. It was necessary to improve the salt stress and low-temperature tolerance of soybean. The main purpose of this paper was to map the qua...Salt and low temperature were both very important factors for soybean production. It was necessary to improve the salt stress and low-temperature tolerance of soybean. The main purpose of this paper was to map the quantitative trait loci(QTL) related with salt tolerance and low- temperature tolerance at germination stage with backcross introgression lines(BILs),and analyze the genetic overlap between them. There were 22 QTL located with BC2 F4 introgression populations after salt stress,and 15 QTL were mapped after low-temperature stress. Seven overlapping QTLs between salt tolerance and low-temperature tolerance were detected on 6 linkage groups at germination stage. In total,there were 31.81 % of salt tolerance and low-temperature tolerance loci existed genetic overlap.展开更多
In recent years,due to excessive emission of industrial waste,wastewater irrigation,and unreasonable utilization of fertilizers,pesticides and plastic sheeting,heavy metal pollution is increasing rapidly,resulting in ...In recent years,due to excessive emission of industrial waste,wastewater irrigation,and unreasonable utilization of fertilizers,pesticides and plastic sheeting,heavy metal pollution is increasing rapidly,resulting in many environmental problems.Silicon(Si),as the second most abundant element in the soil,can not only stimulate plant growth,but alleviate various biotic and abiotic stresses,including heavy metal stress.Here,we reviewed recent advances in the mechanisms for Si-mediated heavy metal tolerance in plants.These mechanisms included reducing active heavy metal ions in growth media,reducing heavy metal transport to the shoot,stimulating enzymatic and non-enzymatic antioxidants,chelation,compartmentation,regulation of the expression of metal transport genes,and structural changes in plants.Further research orientation is also discussed.展开更多
基金Supported by Natural Science Foundation of Yunnan Province(2010CD058)~~
文摘[Objective] This study was to investigate the effect of atrazine stress on the growth of Pennisetum hydridum. [Method] Pot experiments were conducted to study the effects of atrazine stress （20, 50, 100, 200, 500 mg/kg） on plant height, biomass, root-shoot ratio and chlorophyll content of P. hydridum. [Results] Low level of atrazine stress （20 and 50 mg/kg） showed no significant effects on plant height and biomass of P. hydridum. Moderate level of atrazine stress （100 and 200 mg/kg） did not show significant effect on plant height, but did on the biomass of P. hydridum. Biomass of P. hydridum stressed by 100 and 200 mg/kg of atrazine was decreased by 34.1% and 36.4% compared with control, respectively. High level of atrazine stress （500 mg/kg） brought significant decrease in plant height（by 40.6%） and biomass（20.0%） of P. hydridum. All levels of atrazine stress showed no significant effects on root-shoot ratio and chlorophyll content of P. hydridum. [Conclusion] Pennisetum hydridum has strong tolerance to atrazine stress.
基金Supported by National Natural Science Foundation of China under Grant(No.60968001,61168003)Natural Science Foundation of Yunnan Province under Grant(No.2011FZ079,2009CD047)National Training Programs of Innovation and Entrepreneurship for Undergraduates under Grant(No.201210681005,201310681004)~~
文摘[Objective] The aim of this study was to extract effective feature bands of damaged rice leaves by planthoppers to make identification and classification rapidly from great amounts of imaging spectral data. [Method] The experiment, using multi-spectral imaging system, acquired the multi-spectral images of damaged rice leaves from band 400 to 720 nm by interval of 5 nm. [Result] According to the principle of band index, it was calculated that the bands at 515, 510, 710, 555, 630, 535, 505, 530 and 595 nm were having high band index value with rich information and little correlation. Furthermore, the experiment used two classification methods and calcu-lated the classification accuracy higher than 90.00% for feature bands and ful bands of damaged rice leaves by planthoppers respectively. [Conclusion] It can be con-cluded that these bands can be considered as effective feature bands to identify damaged rice leaves by planthoppers quickly from a large scale of crops.
文摘Salt is a major environmental stressor for crops.MicroRNAs(miRNAs)play a crucial role in plant response to salt stress.In this study,a comparative analysis of miRNAs between salt-tolerant and salt-sensitive jute subjected to high salinity were carried out.374 known mature miRNAs were identified and 87 potential miRNA candidates from the eight sRNA libraries were predicted.For the salt-stressed versus the control,181 miRNAs including 45 novel miRNAs were differentially expressed.More differentially expressed miRNAs were present in TC(salt tolerant)than in NY(salt sensitive).Among NY,58 and 27 differentially expressed miRNAs were discovered in leaves and roots,respectively,whereas among TC,45 and 113 differentially expressed miRNAs were discovered in leaves and roots,respectively.Two common differentially expressed miRNAs were discovered in both leaves and roots of the two genotypes.10 differentially expressed miRNAs were common across both leaves and roots only in TC,including 6 upregulated,3 downregulated and one both up and down-regulated miRNA.The results obtained in this analysis contribute to an improved understanding of abiotic-stress tolerance in jute and will be useful for breeding programs to improve jute productivity in soils with high salinity.
文摘Salt and low temperature were both very important factors for soybean production. It was necessary to improve the salt stress and low-temperature tolerance of soybean. The main purpose of this paper was to map the quantitative trait loci(QTL) related with salt tolerance and low- temperature tolerance at germination stage with backcross introgression lines(BILs),and analyze the genetic overlap between them. There were 22 QTL located with BC2 F4 introgression populations after salt stress,and 15 QTL were mapped after low-temperature stress. Seven overlapping QTLs between salt tolerance and low-temperature tolerance were detected on 6 linkage groups at germination stage. In total,there were 31.81 % of salt tolerance and low-temperature tolerance loci existed genetic overlap.
基金Supported by the Program for New Century Excellent Talents in University of China(No.NCET-11-0441)the Chinese Universities Scientific Fund(No.QN2011092)the Talent Introduction Startup Fund of Northwest A&F University,China(No.Z111021003)
文摘In recent years,due to excessive emission of industrial waste,wastewater irrigation,and unreasonable utilization of fertilizers,pesticides and plastic sheeting,heavy metal pollution is increasing rapidly,resulting in many environmental problems.Silicon(Si),as the second most abundant element in the soil,can not only stimulate plant growth,but alleviate various biotic and abiotic stresses,including heavy metal stress.Here,we reviewed recent advances in the mechanisms for Si-mediated heavy metal tolerance in plants.These mechanisms included reducing active heavy metal ions in growth media,reducing heavy metal transport to the shoot,stimulating enzymatic and non-enzymatic antioxidants,chelation,compartmentation,regulation of the expression of metal transport genes,and structural changes in plants.Further research orientation is also discussed.
