The crown root system is the most important root component in maize at both the vegetative and reproductive stages. However, the genetic basis of maize crown root traits(CRT) is still unclear, and the relationship bet...The crown root system is the most important root component in maize at both the vegetative and reproductive stages. However, the genetic basis of maize crown root traits(CRT) is still unclear, and the relationship between CRT and aboveground agronomic traits in maize is poorly understood. In this study, an association panel including 531 elite maize inbred lines was planted to phenotype the CRT and aboveground agronomic traits in different field environments. We found that root traits were significantly and positively correlated with most aboveground agronomic traits, including flowering time, plant architecture and grain yield. Using a genome-wide association study(GWAS)coupled with resequencing, a total of 115 associated loci and 22 high-confidence candidate genes were identified for CRT. Approximately one-third of the genetic variation in crown root was co-located with 46 QTLs derived from flowering and plant architecture. Furthermore, 103 (89.6%) of 115 crown root loci were located within known domestication-and/or improvement-selective sweeps, suggesting that crown roots might experience indirect selection in maize during domestication and improvement. Furthermore, the expression of Zm00001d036901, a high-confidence candidate gene, may contribute to the phenotypic variation in maize crown roots, and Zm00001d036901 was selected during the domestication and improvement of maize. This study promotes our understanding of the genetic basis of root architecture and provides resources for genomics-enabled improvements in maize root architecture.展开更多
钙调磷酸酶B类互作蛋白激酶(CIPK,CBL interacting protein kinases)是植物钙离子信号通路中响应非生物逆境胁迫的重要蛋白激酶之一。本研究以拟南芥和水稻中CIPK家族基因序列信息为基础,利用玉米参考基因组B73和生物信息学分析方法,全...钙调磷酸酶B类互作蛋白激酶(CIPK,CBL interacting protein kinases)是植物钙离子信号通路中响应非生物逆境胁迫的重要蛋白激酶之一。本研究以拟南芥和水稻中CIPK家族基因序列信息为基础,利用玉米参考基因组B73和生物信息学分析方法,全基因组范围内鉴定玉米CIPK基因家族成员,分析CIPK家族基因的进化关系、基因结构、基因表达模式和对干旱胁迫的响应。本研究共鉴定出44个玉米CIPK家族基因,并将其分为5个亚家族,每个亚家族有不同的外显子-内含子和UTR的结构特征;基于基因差异表达分析,筛选出5个与抗旱性相关的候选基因ZmCIPK3、ZmCIPK7、ZmCIPK44、ZmCIPK25和ZmCIPK28;进一步的遗传数据表明,干旱胁迫下ZmCIPK3拟南芥转基因株系的存活率明显高于野生型,提高了拟南芥的抗旱性;同时,干旱胁迫下ZmCIPK3拟南芥转基因株系中抗旱性相关生化指标过氧化物酶、超氧化物歧化酶活性显著高于野生型,而丙二醛和脯氨酸的含量显著低于野生型。本研究在玉米全基因组水平上鉴定了CIPK基因家族成员,分析了其在不同抗旱性材料、不同水分处理下的基因表达模式,明确了ZmCIPK3是一个抗旱性候选基因。展开更多
基金supported by grants from the National Natural Science Foundation of China (31971891)the Guangxi Key Research and Development Projects, China (GuikeAB21238004)+1 种基金the Scientific Innovation 2030 Project, China (2022ZD0401703)the Modern AgroIndustry Technology Research System of Maize, China (CARS-02-03)。
文摘The crown root system is the most important root component in maize at both the vegetative and reproductive stages. However, the genetic basis of maize crown root traits(CRT) is still unclear, and the relationship between CRT and aboveground agronomic traits in maize is poorly understood. In this study, an association panel including 531 elite maize inbred lines was planted to phenotype the CRT and aboveground agronomic traits in different field environments. We found that root traits were significantly and positively correlated with most aboveground agronomic traits, including flowering time, plant architecture and grain yield. Using a genome-wide association study(GWAS)coupled with resequencing, a total of 115 associated loci and 22 high-confidence candidate genes were identified for CRT. Approximately one-third of the genetic variation in crown root was co-located with 46 QTLs derived from flowering and plant architecture. Furthermore, 103 (89.6%) of 115 crown root loci were located within known domestication-and/or improvement-selective sweeps, suggesting that crown roots might experience indirect selection in maize during domestication and improvement. Furthermore, the expression of Zm00001d036901, a high-confidence candidate gene, may contribute to the phenotypic variation in maize crown roots, and Zm00001d036901 was selected during the domestication and improvement of maize. This study promotes our understanding of the genetic basis of root architecture and provides resources for genomics-enabled improvements in maize root architecture.
文摘钙调磷酸酶B类互作蛋白激酶(CIPK,CBL interacting protein kinases)是植物钙离子信号通路中响应非生物逆境胁迫的重要蛋白激酶之一。本研究以拟南芥和水稻中CIPK家族基因序列信息为基础,利用玉米参考基因组B73和生物信息学分析方法,全基因组范围内鉴定玉米CIPK基因家族成员,分析CIPK家族基因的进化关系、基因结构、基因表达模式和对干旱胁迫的响应。本研究共鉴定出44个玉米CIPK家族基因,并将其分为5个亚家族,每个亚家族有不同的外显子-内含子和UTR的结构特征;基于基因差异表达分析,筛选出5个与抗旱性相关的候选基因ZmCIPK3、ZmCIPK7、ZmCIPK44、ZmCIPK25和ZmCIPK28;进一步的遗传数据表明,干旱胁迫下ZmCIPK3拟南芥转基因株系的存活率明显高于野生型,提高了拟南芥的抗旱性;同时,干旱胁迫下ZmCIPK3拟南芥转基因株系中抗旱性相关生化指标过氧化物酶、超氧化物歧化酶活性显著高于野生型,而丙二醛和脯氨酸的含量显著低于野生型。本研究在玉米全基因组水平上鉴定了CIPK基因家族成员,分析了其在不同抗旱性材料、不同水分处理下的基因表达模式,明确了ZmCIPK3是一个抗旱性候选基因。
