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《Journal of Henan Agricultural Sciences》 2009-06
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Research on Relationship between Physiological Indexes and Drought Resistance of Soybeans

GUO Shu-jin,LI Gui-quan(College of Agriculture,Shanxi Agricultural University,Taigu 030801,China)  
The objective of present study was to probe the relationship between physiological in-dexes and drought resistance of different soybean strains and select the most appropriate drought-resistant physiological indexes according to reality of strains.Four strains from the same cross were selected,namely 73-1(sharp leaves and white flowers),73-2(round leaves and purple flowers),73-3(round leaves and white flowers),73-4(sharp leaves and purple flowers).In the condition of drought stress in the nutritional growth period,physiological indexes such as relative water content,contents of proline and chlorophyll,relative electric conductivity and osmotic potential were determined.After harvesting,data of agronomic characters such as plant height,hundred-seed weight,branch quantity,total pods and seed weight of per plant were evaluated.Drought-resistant classes of strains were divided by subordinate function values.Also,relationship between physiological indexes and drought resistance of different strains was analyzed and analysis of correlation and regression was applied.The results were summarized as follows:The order of drought-resistance of the four strains was as following:73-2(round leaf and purple flower),73-1(sharp leaf and white flower),73-3(round leaf and white flower),73-4(sharp leaf and purple flower).Relative water content,contents of chlorophyll and proline were positively correlated with drought resistance,whereas relative electric conductivity,osmotic potential were negatively correlated with drought resistance.By comprehensive comparison of various indexes,it was found that relative water content,chlorophyll content and osmotic potential showed closer relationship with drought resistance,which indicated that they could be used as the best physiological indexes for drought-resistant evaluation.
【Fund】: 国家科技支撑计划重大项目资助(2006BAD01A04);; 山西省科技攻关计划(20080311007-1);; 山西农业大学科技创新基金项目(育种基金)(2006057)
【CateGory Index】: S565.1
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