水稻早衰突变体esl3的鉴定与基因定位  

Identification and Gene Mapping of Rice Early Senescent Leaf (esl3) Mutant

作　　者：苗润隆[1] 蒋钰东[1] 廖红香[1] 徐芳芳[1] 何光华[1] 杨正林[1] 赵芳明[1] 桑贤春[1] 

机构地区：[1]西南大学水稻研究所/转基因植物与安全控制重庆市市级重点实验室/南方山地农业教育部工程研究中心,重庆400716

出　　处：《作物学报》2013年第5期862-867,共6页Acta Agronomica Sinica

基　　金：国家自然科学基金项目(31071072)资助

摘　　要：叶片早衰直接降低作物的光合作用、产量和品质。因此,鉴定早衰突变体和研究其基因功能对于作物的遗传改良具有重要的作用。esl3来源于水稻籼型恢复系缙恢10号的EMS诱变库,苗期叶片中上部呈现褐化枯萎,该特征一直持续到植株成熟。与野生型相比,突变体衰老部位叶绿素和光合速率极显著下降,绿色部位光合色素和光合速率则略有升高。农艺性状分析发现,结实率无显著变化,有效穗、穗长、穗粒数、千粒重、株高和干物质重则显著或极显著下降。遗传分析表明,esl3叶片早衰枯死性状受1对隐性核基因控制。利用391株日本晴/esl3的F2突变型单株,最终把ESL3基因定位在第5染色体SSR标记RM19085和InDel标记Ind05-2之间,物理距离91kb,包含14个注释基因,为下一步调控基因的克隆和功能研究奠定了基础。Leaf early senescence can directly decrease crop photosynthesis, yield and quality. Therefore, the identifications of mutants with early senescence and its gene fimction play key roles in crop genetic improvement. A mutant with early senescent leaf blades, named as esl3, was identified from an EMS-induced progeny in the restorer line Jinhui 10. The middle-upper leaf in mutation displayed a brown and withered phenotype from seedling stage to maturity. Correspondingly, the chlorophyll content and net photosynthetic rate declined in the abnormal leaves while enhanced in the normal green part of leaves compared with the wild type. Agronomic traits, such as panicle number, panicle length, grains per panicle, 1000-grain weight, plant height and weight of dry matter, were reduced significantly or very significantly except for seed setting rate as compared with those of wild type. Ge-netic analysis showed the senescence was controlled by a recessive nuclear gene. Using 391 mutation individuals in a F2 genera- tion ofNipponbare/esl3, ESL3 was mapped between SSR marker RM19085 and InDel marker Ind05-2 on the chromosome 5 with physical distance 91 kb including 14 annotated genes. These results provide a foundation for the further gene cloning and func- tional analysis ofESL3 gene.

关 键 词：水稻(Oryza sativa) 早衰 基因定位 光合速率 

分 类 号：S511[农业科学—作物学]