根系建成(RSA,Root system architecture)决定根系系统的构成,在作物生长发育过程中起着不可替代的作用。解析小麦根系建成遗传机制、选育具有较好根系建成的品种对于小麦高产、抗逆育种具有十分重要的意义。全基因组关联分析(GWAS)是...根系建成(RSA,Root system architecture)决定根系系统的构成,在作物生长发育过程中起着不可替代的作用。解析小麦根系建成遗传机制、选育具有较好根系建成的品种对于小麦高产、抗逆育种具有十分重要的意义。全基因组关联分析(GWAS)是解析小麦复杂数量遗传性状遗传机制的有效方法。本研究基于全基因组关联分析方法,发掘根系建成相关性状关联位点,以期为小麦根系建成分子育种提供参考。对160份来自于河南和山东等地的小麦品种根系建成相关性状(总根长、总根表面积、总根体积、平均根直径和根尖数)进行统计评价,并结合660K SNP芯片数据进行全基因组关联分析。检测到23个关联位点,分布于1A、2A、2B、3B、4A、5A、5B、5D、6A、6B和7B染色体上,解释7.2%~12.8%的表型变异。其中,11个位点与已报道的位点一致,其他12个位点为新的位点。本研究对于解析根系建成遗传机制,选育高产、抗逆小麦品种具有重要意义。展开更多
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
文摘根系建成(RSA,Root system architecture)决定根系系统的构成,在作物生长发育过程中起着不可替代的作用。解析小麦根系建成遗传机制、选育具有较好根系建成的品种对于小麦高产、抗逆育种具有十分重要的意义。全基因组关联分析(GWAS)是解析小麦复杂数量遗传性状遗传机制的有效方法。本研究基于全基因组关联分析方法,发掘根系建成相关性状关联位点,以期为小麦根系建成分子育种提供参考。对160份来自于河南和山东等地的小麦品种根系建成相关性状(总根长、总根表面积、总根体积、平均根直径和根尖数)进行统计评价,并结合660K SNP芯片数据进行全基因组关联分析。检测到23个关联位点,分布于1A、2A、2B、3B、4A、5A、5B、5D、6A、6B和7B染色体上,解释7.2%~12.8%的表型变异。其中,11个位点与已报道的位点一致,其他12个位点为新的位点。本研究对于解析根系建成遗传机制,选育高产、抗逆小麦品种具有重要意义。
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.
