Mapping two major effect grain dormancy QTL in rice
文献类型: 外文期刊
第一作者: Lu, Bingyue
作者: Lu, Bingyue;Xie, Kun;Yang, Chunyan;Wang, Songfeng;Liu, Xi;Zhang, Long;Jiang, Ling;Wan, Jianmin;Wan, Jianmin
作者机构:
关键词: Dormancy;Advanced backcross population;Epistatic interaction;Dry heat treatment;Rice (Oryza sativa L.)
期刊名称:MOLECULAR BREEDING ( 影响因子:2.589; 五年影响因子:2.75 )
ISSN: 1380-3743
年卷期: 2011 年 28 卷 4 期
页码:
收录情况: SCI
摘要: The intrachromosomal positions of the two grain dormancy quantitative trait loci (QTL) qSdn-1 (chromosome 1) and qSdn-5 (chromosome 5) were obtained from the segregation analysis of the advanced backcross populations derived from the cross between rice (Oryza sativa L.) cultivars N22 (indica) and Nanjing35 (japonica). Marker-assisted selection (MAS) was applied to select derivatives carrying one or both of qSdn-1 and qSdn-5 in a genetic background which was nearly isogenic to Nanjing35. An analysis of dormancy in the BC4F2 population allowed qSdn-1 to be located between the simple sequence repeat (SSR) markers RM11669 and RM1216; the QTL explained 24.58% of the overall phenotypic variation and the most closely linked marker was RM11694. qSdn-5 was mapped between RM480 and RM3664, and explained 17.58% of the overall phenotypic variation. The SSR locus RM19080 mapped within 0.4 cM of qSdn-5. No epistasis was observed between qSdn-1 and qSdn-5. The mean germination rates of lines containing qSdn-1, qSdn-5 and both qSdn-1 and qSdn-5 were 7.9, 11.1 and 6.1%, respectively, whereas that of the check line lacking both QTL was 86.3%. The SSR loci linked most tightly to qSdn-1 and qSdn-5 are suitable for MAS for reduced pre-harvest sprouting in rice. The dormancy of both qSdn-1 and qSdn-5 could be readily broken by a 7-day post-harvest treatment at 50A degrees C.
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