浙江农业学报

• 作物科学 • 上一篇    下一篇

影响高粱茎秆汁液含量基因的精细定位

翟国伟1,邹桂花1,严松2,王华1,邵健丰1,陶跃之1   

  1. 1浙江省植物有害生物防控重点实验室,浙江省农业科学院 作物与核技术利用研究所,浙江 杭州 310021;2 江西省农业科学院 水稻研究所,江西 南昌 330200
  • 出版日期:2014-07-25 发布日期:2014-08-06

Identification and fine mapping of the gene associated with moisture content of stem in sorghum [Sorghum bicolor (L.) Moench]

  1. 1 State Key Laboratory Breeding Base for Zhejiang Sustainable Pest and Disease Control, Institute of Crop and Nuclear Technology Utilization, Zhejiang Academy of Agricultural Sciences, Hangzhou 310021, China;2 Rice Research Institute, Jiangxi Academy of Agricultural Sciences, Nanchang 330200, China
  • Online:2014-07-25 Published:2014-08-06

摘要: 无论是用作牲畜饲料或榨汁做糖,茎秆汁液含量对于甜高粱而言都是一个非常重要的农艺性状。本研究通过对两套独立的F2群体观察统计发现,影响高粱茎秆汁液含量(MCS)的基因Dd呈现质量性状基因的遗传规律,且干髓对多汁为显性。用SSR标记初定位表明该基因位于第6号染色体,扩大定位群体后,用群体F21将其定位在标记sm06068和sm06093之间,用群体F22将其定位在sm06068和sm06069之间,两个区段的物理距离均约为470 kb。为了进一步缩小定位区间,对定位群体的亲本进行了测序分析并开发了2个InDel标记。最终,目标基因被锁定在只包含6个候选基因的区间范围内。基因d的精细定位为该基因的克隆及今后分子育种中的应用打下基础。

关键词: 高粱, 基因Dd, 遗传分析, 精细定位

Abstract: The moisture content is very important for both forage and syrup use of sweet sorghum. In the present study, the gene Dd, which is related to moisture content of stem (MCS), was proved as qualitative and the dominance of pithy over juicy type by the genetic analysis, using two F2 populations derived from a pithy cultivar Fangshannian crossing a juicy cultivar Shuangli and a juicy cultivar Btx623 crossing a pithy cultivar 7361. Primary mapping of the gene indicated that d was located on chromosome 6. By enlarging the mapping population, the locus was then fine mapped to a 470 kb interval between SSR markers sm06068 and sm06093 for F21 and sm06068 and sm06069 for F22. To narrow down the number of candidate genes, the target regions of Fangshannian, Shuangli and 7361 were sequenced and 2 InDel markers were mined. Finally, the locus was located to the region between markers sm06068 and Sb62, which harbored only six candidate genes. Genetic mapping of d provided an opportunity to identify genes involved in the moisture content of sorghum.

Key words: sorghum (Sorghum bicolor (L.) Moench), gene Dd, genetic analysis, fine mapping