水稻叶脉黄化突变体yml的遗传分析及基因定位  

Genetic analysis and gene mapping of the yellow midrib leaf mutant(yml)in rice(Oryza sativa L.)

作　　者：郭均瑶 刘斌美 杨惠杰[1,2] 秦超琦 任艳 姜鸿瑞 陶亮之 叶亚峰[2] 吴跃进[1,2] GUO Jun-Yao;LIU Bin-Mei;YANG Hui-Jie;QIN Chao-Qi;REN Yan;JIANG Hong-Rui;TAO Liang-Zhi;YE Ya-Feng;WU Yue-Jin(Institutes of Physical Science and Information Technology,Anhui University,Hefei 230031,Anhui,China;Hefei Institutes of Physical Science,Chinese Academy of Science,Hefei 230031,Anhui,China)

机构地区：[1]安徽大学物质科学与信息技术研究院,安徽合肥230031 [2]中国科学院合肥物质科学研究院,安徽合肥230031

出　　处：《作物学报》2022年第12期3120-3129,共10页Acta Agronomica Sinica

基　　金：安徽省自然科学基金项目(2108085MC99);合肥市“借转补”科技专项(J2020G45);安徽省科技重大专项(202003c08020006)资助。

摘　　要：水稻(Oryza sativa L.)是重要的粮食作物之一,其产量一直备受关注。水稻叶片是光合作用的重要场所,叶脉是叶片中具有支撑和运输功能的组织。同时,叶脉中存在的光合色素也能提供一定的光合作用。本研究采用重离子束诱变籼稻9311获得的叶脉黄化突变体yml进行遗传分析及基因定位研究。该突变体在抽穗期开花后5d左右,开始出现叶脉黄化表型,并于抽穗后期黄化性状明显,并持续至成熟期。在分蘖期,突变体与野生型相比,光合色素含量无显著差异。但在抽穗后期,突变体叶片及叶脉中光合色素含量显著降低,导致光合效率明显降低,净光合速率仅为野生型的50.37%。成熟期突变体的株高、穗长、有效穗数、每穗实粒数、结实率、千粒重均显著低于野生型。通过遗传分析,确定该突变性状由一对隐性基因控制。利用图位克隆技术,将该基因定位于6号染色体。进一步通过简单重复序列(SSR)及插入缺失(InDel)标记,将该基因位置缩小至InDel5与RM3431之间,物理距离约为700 kb。本研究为后续突变体基因的克隆和功能分析提供了研究基础。Rice(Oryza sativa L.)is an important food crop,and its yield has been concerned for a long time.Rice leaves are the essential sites for photosynthesis,and leaf midrib is the tissue with the function of supporting and transporting.Meanwhile,the photosynthetic pigments present in leaf midrib can also provide a certain amount of photosynthesis.In this study,the yellow midrib leaf(yml)mutant obtained by the heavy ion beam implantation on indica rice 9311 was applied for genetic analysis and gene mapping.The mutant began to had the yellowing phenotype of leaf midrib about 5 days after flowering at heading stage,and the yellowing character was obvious at the late heading stage,and this change could last until the mature stage.At tillering stage,there was no significant difference in photosynthetic pigment content between the mutant and the wild type.However,compared with wild type at the late heading stage,the photosynthetic pigment content in the leaves and midribs of the mutant was significantly lower.Consequently,the photosynthetic efficiency of the mutant was substantially reduced,and the net photosynthetic rate was only 50.37%of wild type.At mature stage,plant height,panicle length,effective panicle,filled grain number per panicle,seed setting rate,and the 1000-grain weight of mutants were significantly lower than wild type.Genetic analysis revealed that this mutant character was controlled by a pair of recessive genes.By using map-based cloning technique,this gene was located on chromosome 6.Moreover,the gene was further located between InDel5 and RM3431 with a physical distance of approximately 700 kb by using simple repeat sequence(SSR)and insertional deletion(InDel)markers.This study provides a research basis for the subsequent cloning and functional analyses of the mutant gene.

关 键 词：水稻 叶脉 黄化 光合特性 基因定位 

分 类 号：S511[农业科学—作物学]