Fine mapping of a gene causing hybrid pollen sterility between Yunnan weedy rice and cultivated rice (Oryza sativa L.) and phylogenetic analysis of Yunnan weedy rice
文献类型: 外文期刊
第一作者: Wang, Yong
作者: Wang, Yong;Zhong, Zheng Zheng;Zhao, Zhi Gang;Jiang, Ling;Bian, Xiao Feng;Zhang, Wen Wei;Liu, Ling Long;Wan, Jian Min;Wan, Jian Min;Ikehashi, H.
作者机构:
关键词: Cytology;Fine mapping;Hybrid sterility;Phylogeny analysis;Pollen abortion;Weedy rice
期刊名称:PLANTA ( 影响因子:4.116; 五年影响因子:4.316 )
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收录情况: SCI
摘要: Weedy rice represents an important resource for rice improvement. The F-1 hybrid between the japonica wide compatibility rice cultivar 02428 and a weedy rice accession from Yunnan province (SW China) suffered from pollen sterility. Pollen abortion in the hybrid occurred at the early bicellular pollen stage, as a result of mitotic failure in the microspore, although the tapetum developed normally. Genetic mapping in a BC1F1 population (02428//Yunnan weedy rice (YWR)/02428) showed that a major QTL for hybrid pollen sterility (qPS-1) was present on chromosome 1. qPS-1 was fine-mapped to a 110 kb region known to contain the hybrid pollen sterility gene Sa, making it likely that qPS-1 is either identical to, or allelic with Sa. Interestingly, F-1 hybrid indicated that Dular and IR36 were assumed to carry the sterility-neutral allele, Sa (n) . Re-sequencing SaM and SaF, the two component genes present at Sa, suggested that variation for IR36 and Dular may be responsible for the loss of male sterility, and the qPS-1 sequence might be derived from wild rice or indica cultivars. A phylogenetic analysis based on microsatellite genotyping suggested that the YWR accession is more closely related to wild rice and indica type cultivars than to japonica types. Thus it is probable that the YWR accession evolved from a spontaneous hybrid between wild rice and an ancient cultivated strain of domesticated rice.
分类号: Q94
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