水稻极早抽穗期基因的鉴定和遗传分析

利用一个带有华粳籼74遗传背景的单片段代换系文库对水稻抽穗期基因进行评价,发现单片段代换系W 23-03-08-9-1带有极早抽穗期基因,在山东和海南种植,抽穗期稳定且表现早抽穗。该代换系代换区间为PSM306-PSM305-PSM304-RM3894-RM3372-RM569-RM231-RM489-RM545-RM251-RM282,在第3染色体上,带有抽穗期基因qHD3-1。利用该代换系与受体华粳籼74杂交,得到F2代分离群体,对分离群体单株进行抽穗期鉴定,发现早抽穗单株数对晚抽穗单株数的分离比例符合3∶1,说明早抽穗基因为一个显性基因控制,且属于基本营养生长型的抽穗期基因。

Identification and Genetic Analysis of Gene for Extremely Early Heading Date in Rice

A library of single segment substitution line(SSSL) in the same genetic background of Huajingxian 74 was used to evaluate the gene for heading date.From the library,SSSL W23-03-08-9-1 was found having gene for extremely early heading date which performed stable and early heading in two environments of Shandong and Hainan province.qHD3-1 gene on the third chromosome was identified in SSSL W23-03-08-9-1 with substituted interval of PSM306-PSM305-PSM304-RM3894-RM3372-RM569-RM231-RM489-RM545-RM251-RM282.The F2 segregating population was developed from a cross between SSSL W23-03-08-9-1 and Huajingxian 74.In this segregating population,the distribution of ear-heading plants and late-heading plants fit a ratio of 3∶1,indicating early heading was controlled by one major dominant genes,and the gene identified in SSSL W23-03-08-9-1 belonging to the heading-date gene for basic vegetative growth.