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Evaluation of high yielding soybean germplasm under water limitation
Authors:Silvas J Prince  Mackensie Murphy  Raymond N Mutava  Zhengzhi Zhang  Na Nguyen  Yoon Ha Kim  Safiullah M Pathan  Grover J Shannon  Babu Valliyodan  Henry T Nguyen
Institution:National Center for Soybean Biotechnology and Division of Plant Sciences, University of Missouri, Columbia, MO, USA
Abstract:Limited information is available for soybean root traits and their plasticity under drought stress. To date, no studies have focused on examining diverse soybean germplasm 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, PI458020 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.
Keywords:Fibrous root  root angle  root plasticity  root system architecture (RSA)  root thickness  spectral indices  soybean  spectral indices  total root length  water limitation
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