We aimed to investigate the effects of phosphate treatment on growth dynamics of wheat in wheat/corn intercropping system in southwest hil y area. [Method] Five phosphate fertilization levels were designed for wheat a...We aimed to investigate the effects of phosphate treatment on growth dynamics of wheat in wheat/corn intercropping system in southwest hil y area. [Method] Five phosphate fertilization levels were designed for wheat and corn respectively to investigate the effects of phosphate fertilization level on wheat/corn intercropping system by field block experiment. [Result] The number of til ers, plant height and yield component of wheat trended to increase with the increase of phos-phate fertilization amount and al reached the peak for phosphate fertilization amount of 135 kg/hm2. However, the number of til ers, plant height and yield component of wheat al decreased significantly with the further increase of phosphate fertilization amount. [Conclusion] Phosphate fertilization contributed to the wheat growth in a certain degree. However, excessive phosphate fertilization would affect final yield.展开更多
Variables among the macroclimate, microclimate and rice canopy categories and three other different farming systems were evaluated on their effects to the egg and larval density of Aedes spp. mosquitoes known as trans...Variables among the macroclimate, microclimate and rice canopy categories and three other different farming systems were evaluated on their effects to the egg and larval density of Aedes spp. mosquitoes known as transmitters of animal and human diseases. No statistical difference in egg density （#eggs/mL） among farming systems （P = 0.345） were observed. However, there was significant difference in larval density （#1arvae/mL） among farming systems （P 〈 0.001） particularly between organic and conventional farms and between organic and mixed farms at （P 〈 0.05）. Among the variables in the macroclimate category, wind velocity and ambient temperature significantly influenced larval density in conventional farms. Among the variables in the microclimate category, water temperature significantly contributed to larval density in both the mixed and conventional farms whereas water turbidity, in conventional farms. Among the variables in the rice canopy category, the number of tillers per plant was a significant contributor to larval density in all farm types. No variable among the environmental exposure categories affected the larval density in organic farms.展开更多
The morphological characters, physiological characters, yield traits and yield per plant of total 49 rice cultivars from Ningxia were investigated under conditions of water stress and non-water stress so as to determi...The morphological characters, physiological characters, yield traits and yield per plant of total 49 rice cultivars from Ningxia were investigated under conditions of water stress and non-water stress so as to determine the relationship between each trait and yield per plant under water stress and the relationship between each relative character and drought resistance coefficient under water stress and non-water stress. The correlation, grey correlation, stepwise regression and path analyses showed that the tiller number per plant, plant height, grain density, effective panicle number per plant and grain number per panicle, total 5 traits, were significantly correlated with the drought resistance of rice, and they could be used to identify the drought resistance of rice in Ningxia. In addition, the drought resistance of rice was graded qualitatively according to the subordinate function value of corresponding drought resistance coefficient. The results showed that among the 49 rice cultivars from Ningxia,6 rice cultivars were highly drought resistant, and 9 rice cultivars were moderately drought resistant, suggesting that the evaluation method was feasible and effective.展开更多
In this study,the cultivated bitter gourd inbred line‘Foli 112’and the wild bitter gourd accession THMC170 were used as female(P1)and male(P2)parent,respectively,to obtain 4 generations(P1,P2,F1 and F2)through self-...In this study,the cultivated bitter gourd inbred line‘Foli 112’and the wild bitter gourd accession THMC170 were used as female(P1)and male(P2)parent,respectively,to obtain 4 generations(P1,P2,F1 and F2)through self-crossing and hybridization.The mixed major gene plus polygene inheritance model of plant quantitative trait was used to perform genetic analysis for 5 plant type-related traits including the number of internode,leaf length,leaf width,stem width and internode length in bitter gourd.Results showed that the inheritance of internode number,leaf length and leaf width was in accordance with E-6 model which involved two pairs of equi-dominant major genes with additive-dominant polygene model;the stem width was controlled by additive-dominance-epistasis polygene inheritance model(C-0 model);the inheritance of internode length involved 2 pairs of equi-additive major genes with additive-dominant polygene model(E-4 model).Meanwhile,the heritability(h2)of stem width and internode number was 20.08%and 39.28%,respectively,indicating that they were vulnerable to environment impacts;leaf length,leaf width and internode length had a higher heritability of 51.50%,52.16%and 64.36%,respectively;the inheritance of leaf length was mainly controlled by major gene(the heritability of major gene was 40.75%),indicating that early-generation selection was better for leaf length,while the inheritance of leaf width and internode length was mainly controlled by mutiple minor genes,indicating that it was better to select these two parameters for late generation.展开更多
Gnaphalium oxyphyllum DC is a medicinal plant whose common uses by Mexican people include the treatment of cancer. The toxicity of the aqueous and organic fractions as well as the aqueous decoction of G. oxyphyllum va...Gnaphalium oxyphyllum DC is a medicinal plant whose common uses by Mexican people include the treatment of cancer. The toxicity of the aqueous and organic fractions as well as the aqueous decoction of G. oxyphyllum var. natalie F. J. Espinosa were assessed on three human cancer cell lines as well as in blood cells in healthy human lymphocyte cultures. Cytotoxic activity was assessed by the Sulforhodamine B method on HeLa （human cervical carcinoma）, T47D （human breast carcinoma） and 22Rvl （human prostate carcinoma cancer）. Colchicine was used as positive control. The decoction was also tested on lymphocytes from healthy donors through the mitotic index as biomarker. We used whole blood for these cultures and estimated the effect of the extract on platelets, leukocytes and erythrocytes. The aqueous decoction was cytotoxic （EDs0 〈 20 μg/mL） on the three cancer cell lines. The mitotic index in the exposed lymphocyte cultures did not significantly differ from the control nor the blood counts showed any difference between the experimental and control cultures. These results prove that the toxic effect of the aqueous decoction of G. oxyphyllum var. natalie is specific for cancer cell lines.展开更多
文摘We aimed to investigate the effects of phosphate treatment on growth dynamics of wheat in wheat/corn intercropping system in southwest hil y area. [Method] Five phosphate fertilization levels were designed for wheat and corn respectively to investigate the effects of phosphate fertilization level on wheat/corn intercropping system by field block experiment. [Result] The number of til ers, plant height and yield component of wheat trended to increase with the increase of phos-phate fertilization amount and al reached the peak for phosphate fertilization amount of 135 kg/hm2. However, the number of til ers, plant height and yield component of wheat al decreased significantly with the further increase of phosphate fertilization amount. [Conclusion] Phosphate fertilization contributed to the wheat growth in a certain degree. However, excessive phosphate fertilization would affect final yield.
文摘Variables among the macroclimate, microclimate and rice canopy categories and three other different farming systems were evaluated on their effects to the egg and larval density of Aedes spp. mosquitoes known as transmitters of animal and human diseases. No statistical difference in egg density （#eggs/mL） among farming systems （P = 0.345） were observed. However, there was significant difference in larval density （#1arvae/mL） among farming systems （P 〈 0.001） particularly between organic and conventional farms and between organic and mixed farms at （P 〈 0.05）. Among the variables in the macroclimate category, wind velocity and ambient temperature significantly influenced larval density in conventional farms. Among the variables in the microclimate category, water temperature significantly contributed to larval density in both the mixed and conventional farms whereas water turbidity, in conventional farms. Among the variables in the rice canopy category, the number of tillers per plant was a significant contributor to larval density in all farm types. No variable among the environmental exposure categories affected the larval density in organic farms.
基金Supported by Natural Science Foundation of Ningxia(NZ1189)National Rice Industrial Technology System(CARS-01-84)
文摘The morphological characters, physiological characters, yield traits and yield per plant of total 49 rice cultivars from Ningxia were investigated under conditions of water stress and non-water stress so as to determine the relationship between each trait and yield per plant under water stress and the relationship between each relative character and drought resistance coefficient under water stress and non-water stress. The correlation, grey correlation, stepwise regression and path analyses showed that the tiller number per plant, plant height, grain density, effective panicle number per plant and grain number per panicle, total 5 traits, were significantly correlated with the drought resistance of rice, and they could be used to identify the drought resistance of rice in Ningxia. In addition, the drought resistance of rice was graded qualitatively according to the subordinate function value of corresponding drought resistance coefficient. The results showed that among the 49 rice cultivars from Ningxia,6 rice cultivars were highly drought resistant, and 9 rice cultivars were moderately drought resistant, suggesting that the evaluation method was feasible and effective.
文摘In this study,the cultivated bitter gourd inbred line‘Foli 112’and the wild bitter gourd accession THMC170 were used as female(P1)and male(P2)parent,respectively,to obtain 4 generations(P1,P2,F1 and F2)through self-crossing and hybridization.The mixed major gene plus polygene inheritance model of plant quantitative trait was used to perform genetic analysis for 5 plant type-related traits including the number of internode,leaf length,leaf width,stem width and internode length in bitter gourd.Results showed that the inheritance of internode number,leaf length and leaf width was in accordance with E-6 model which involved two pairs of equi-dominant major genes with additive-dominant polygene model;the stem width was controlled by additive-dominance-epistasis polygene inheritance model(C-0 model);the inheritance of internode length involved 2 pairs of equi-additive major genes with additive-dominant polygene model(E-4 model).Meanwhile,the heritability(h2)of stem width and internode number was 20.08%and 39.28%,respectively,indicating that they were vulnerable to environment impacts;leaf length,leaf width and internode length had a higher heritability of 51.50%,52.16%and 64.36%,respectively;the inheritance of leaf length was mainly controlled by major gene(the heritability of major gene was 40.75%),indicating that early-generation selection was better for leaf length,while the inheritance of leaf width and internode length was mainly controlled by mutiple minor genes,indicating that it was better to select these two parameters for late generation.
文摘Gnaphalium oxyphyllum DC is a medicinal plant whose common uses by Mexican people include the treatment of cancer. The toxicity of the aqueous and organic fractions as well as the aqueous decoction of G. oxyphyllum var. natalie F. J. Espinosa were assessed on three human cancer cell lines as well as in blood cells in healthy human lymphocyte cultures. Cytotoxic activity was assessed by the Sulforhodamine B method on HeLa （human cervical carcinoma）, T47D （human breast carcinoma） and 22Rvl （human prostate carcinoma cancer）. Colchicine was used as positive control. The decoction was also tested on lymphocytes from healthy donors through the mitotic index as biomarker. We used whole blood for these cultures and estimated the effect of the extract on platelets, leukocytes and erythrocytes. The aqueous decoction was cytotoxic （EDs0 〈 20 μg/mL） on the three cancer cell lines. The mitotic index in the exposed lymphocyte cultures did not significantly differ from the control nor the blood counts showed any difference between the experimental and control cultures. These results prove that the toxic effect of the aqueous decoction of G. oxyphyllum var. natalie is specific for cancer cell lines.
