Limited information is available for soybean root traits and their plasticity under drought stress. To date, no studies have focused on examining diverse soybean germ- plasm for regulation of shoot and root response u...Limited information is available for soybean root traits and their plasticity under drought stress. To date, no studies have focused on examining diverse soybean germ- plasm for regulation of shoot and root response under water limited conditions across varying soil types. In this study, 17 genetically diverse soybean germplasm lines were selected to study root response to water limited conditions in clay （trial 1） and sandy soil （trial 2） in two target environments. Physiological data on shoot traits was measured at multiple crop stages ranging from early vegetative to pod filling. The phenotypic root traits, and biomass accumulation data are collected at pod filling stage. In trial 1, the number of lateral roots and forks were positively correlated with plot yield under water limitation and in trial 2, lateral root thickness was positively correlated with the hill plot yield. Plant Introduction （PI） 578477A and 088444 were found to have higher later root number and forks in clay soil with higher yield under water limitation, in sandy soil, P1458o2o was found to have a thicker lateral root system and higher yield under water limitation. The genotypes identified in this study could be used to enhance drought tolerance of elite soybean cultivars through improved root traits specific to target environments.展开更多
根系构型影响根系空间分布和营养吸收效率,反映了植物适应环境胁迫的生存策略。采用标准化主轴估计(Standardized major axis estimation,SMA)的方法,分析了甘肃金塔北海子国家湿地公园3年生和6年生多枝柽柳(Tamarix ramosissima)根系...根系构型影响根系空间分布和营养吸收效率,反映了植物适应环境胁迫的生存策略。采用标准化主轴估计(Standardized major axis estimation,SMA)的方法,分析了甘肃金塔北海子国家湿地公园3年生和6年生多枝柽柳(Tamarix ramosissima)根系分叉数与分支角度的异速生长关系。结果表明:随着林龄的增长,湿地群落盖度、高度逐渐增加,多枝柽柳种群的盖度、密度、高度和地上生物量以及根系深度、分叉数、比根长、比表面积、各级根系直径随之增加,根系分支角度和根冠比逐渐减小;多枝柽柳根系分叉数与分支角度回归方程的标准主轴斜率逐渐增大(P<0.05),随着林龄的增长,多枝柽柳根系分叉数的增加速度逐渐大于根系分支角度的生长速度,二者在林龄间呈现出差异化的异速生长关系。随着林龄的增长,多枝柽柳根系构型模式由"扩散型"转变为"紧缩型",体现了种群应对生境胁迫和竞争的生态适应机制。展开更多
基金funding support from Missouri Soybean Merchandising Council-Project 220
文摘Limited information is available for soybean root traits and their plasticity under drought stress. To date, no studies have focused on examining diverse soybean germ- plasm for regulation of shoot and root response under water limited conditions across varying soil types. In this study, 17 genetically diverse soybean germplasm lines were selected to study root response to water limited conditions in clay （trial 1） and sandy soil （trial 2） in two target environments. Physiological data on shoot traits was measured at multiple crop stages ranging from early vegetative to pod filling. The phenotypic root traits, and biomass accumulation data are collected at pod filling stage. In trial 1, the number of lateral roots and forks were positively correlated with plot yield under water limitation and in trial 2, lateral root thickness was positively correlated with the hill plot yield. Plant Introduction （PI） 578477A and 088444 were found to have higher later root number and forks in clay soil with higher yield under water limitation, in sandy soil, P1458o2o was found to have a thicker lateral root system and higher yield under water limitation. The genotypes identified in this study could be used to enhance drought tolerance of elite soybean cultivars through improved root traits specific to target environments.
文摘根系构型影响根系空间分布和营养吸收效率,反映了植物适应环境胁迫的生存策略。采用标准化主轴估计(Standardized major axis estimation,SMA)的方法,分析了甘肃金塔北海子国家湿地公园3年生和6年生多枝柽柳(Tamarix ramosissima)根系分叉数与分支角度的异速生长关系。结果表明:随着林龄的增长,湿地群落盖度、高度逐渐增加,多枝柽柳种群的盖度、密度、高度和地上生物量以及根系深度、分叉数、比根长、比表面积、各级根系直径随之增加,根系分支角度和根冠比逐渐减小;多枝柽柳根系分叉数与分支角度回归方程的标准主轴斜率逐渐增大(P<0.05),随着林龄的增长,多枝柽柳根系分叉数的增加速度逐渐大于根系分支角度的生长速度,二者在林龄间呈现出差异化的异速生长关系。随着林龄的增长,多枝柽柳根系构型模式由"扩散型"转变为"紧缩型",体现了种群应对生境胁迫和竞争的生态适应机制。
