Drought is a major abiotic stress that causes the yearly yield loss of maize, a crop cultured worldwide. Breeding drought-tolerant maize cultivars is a priority requirement of world agriculture. Clade A PP2C phosphata...Drought is a major abiotic stress that causes the yearly yield loss of maize, a crop cultured worldwide. Breeding drought-tolerant maize cultivars is a priority requirement of world agriculture. Clade A PP2C phosphatases （PP2C-A）, which are conserved in most plant species, play important roles in abscisic acid （ABA） signaling and plant drought response. However, natural variations of PP2C-A genes that are directly associated with drought tolerance remain to be elucidated. Here, we conducted a candidate gene association analysis of the ZmPP2C-A gene family in a maize panel consisting of 368 varieties collected worldwide, and identified a drought responsive gene ZmPP2C-AIO that is tightly associated with drought tolerance. We found that the degree of drought tolerance of maize cultivars negatively corre- lates with the expression levels of ZmPP2C-AIO. ZmPP2C-A10, like its Arabidopsis orthologs, interacts with ZmPYL ABA receptors and ZmSnRK2 kinases, suggesting that ZmPP2C-A10 is involved in mediating ABA signaling in maize. Transgenic studies in maize and Arabidopsis confirmed that ZmPP2C-A10 functions as a negative regulator of drought tolerance. Further, a causal natural variation, deletion allele-338, which bears a deletion of ERSE （endoplasmic reticulum stress response element） in the 51-UTR region of ZmPP2C-AIO, was detected. This deletion causes the loss of endoplasmic reticulum （ER） stress-induced expression of ZmPP2C-AIO, leading to increased plant drought tolerance. Our study provides direct evidence linking ER stress signaling with drought tolerance and genetic resources that can be used directly in breeding drought-tolerant maize cultivars.展开更多
为了建立稳定可靠的玉米真实性和纯度鉴定SSR标记,对DNA提取方法、SSR引物和多重PCR反应程序进行了优化。结果表明,用预热到75℃以上的研钵和95℃的1.5×CTAB提取缓冲液进行材料研磨,可得到纯度高、完整性好的DNA,并且提取成本较低...为了建立稳定可靠的玉米真实性和纯度鉴定SSR标记,对DNA提取方法、SSR引物和多重PCR反应程序进行了优化。结果表明,用预热到75℃以上的研钵和95℃的1.5×CTAB提取缓冲液进行材料研磨,可得到纯度高、完整性好的DNA,并且提取成本较低。利用软件Primer Premier 5.0和Oligo 6.72对玉米指纹鉴定的SSR核心引物进行重新分析与设计,建立了21对SSR通用引物构成的8组多重PCR复合扩增体系和3步法扩增程序,均能在统一的PCR扩增条件下进行,扩增片段之间不存在交叉现象,扩增条带清晰,扩增结果稳定,这一扩增体系检测效率比单对SSR引物提高2.6倍以上。展开更多
文摘Drought is a major abiotic stress that causes the yearly yield loss of maize, a crop cultured worldwide. Breeding drought-tolerant maize cultivars is a priority requirement of world agriculture. Clade A PP2C phosphatases （PP2C-A）, which are conserved in most plant species, play important roles in abscisic acid （ABA） signaling and plant drought response. However, natural variations of PP2C-A genes that are directly associated with drought tolerance remain to be elucidated. Here, we conducted a candidate gene association analysis of the ZmPP2C-A gene family in a maize panel consisting of 368 varieties collected worldwide, and identified a drought responsive gene ZmPP2C-AIO that is tightly associated with drought tolerance. We found that the degree of drought tolerance of maize cultivars negatively corre- lates with the expression levels of ZmPP2C-AIO. ZmPP2C-A10, like its Arabidopsis orthologs, interacts with ZmPYL ABA receptors and ZmSnRK2 kinases, suggesting that ZmPP2C-A10 is involved in mediating ABA signaling in maize. Transgenic studies in maize and Arabidopsis confirmed that ZmPP2C-A10 functions as a negative regulator of drought tolerance. Further, a causal natural variation, deletion allele-338, which bears a deletion of ERSE （endoplasmic reticulum stress response element） in the 51-UTR region of ZmPP2C-AIO, was detected. This deletion causes the loss of endoplasmic reticulum （ER） stress-induced expression of ZmPP2C-AIO, leading to increased plant drought tolerance. Our study provides direct evidence linking ER stress signaling with drought tolerance and genetic resources that can be used directly in breeding drought-tolerant maize cultivars.
文摘为了建立稳定可靠的玉米真实性和纯度鉴定SSR标记,对DNA提取方法、SSR引物和多重PCR反应程序进行了优化。结果表明,用预热到75℃以上的研钵和95℃的1.5×CTAB提取缓冲液进行材料研磨,可得到纯度高、完整性好的DNA,并且提取成本较低。利用软件Primer Premier 5.0和Oligo 6.72对玉米指纹鉴定的SSR核心引物进行重新分析与设计,建立了21对SSR通用引物构成的8组多重PCR复合扩增体系和3步法扩增程序,均能在统一的PCR扩增条件下进行,扩增片段之间不存在交叉现象,扩增条带清晰,扩增结果稳定,这一扩增体系检测效率比单对SSR引物提高2.6倍以上。
