摘要
水稻的糯性基因控制着籽粒胚乳的直链淀粉含量。在糯与非糯水稻的杂种中,曾发现一些F2中糯性纯合体显著少于25％,使分离比偏离正常的 3:1,这种趋势在远缘杂交组合中尤为明显,已知存在某些对异常分离起作用的因子。与胚乳糯性基因wx连锁的F1不育基因以及花粉竞争所引起的配子选择被认为是造成分离异常的主要因子。我们对糯稻品种所配亚种间杂种的研究发现,糯性基因的异常分离具有糯性纯合体偏少和偏多两个方向,且与F1育性基因无关。现报道如下。
In order to study the segregation distortion of waxy gene, three intersubspecific com- patible japonica varieties Xiushui 117, T8340 and 02428, and Taichung 65 and its four isogenic F_1-sterile lines were used to cross and backcross with three pairs of waxy and isogenic nonwaxy indica lines Yuanfengzao vs Yuanfengzao Nuo, Guangluai 4 vs Guangluai 4 Nuo and Zhenzhu 19 vs Zhenzhu 19 Nuo. Results indicated that for grains setting on F_1 plants and triple cross F_1 plants, the segregation of nonwaxy(n) and waxy(w)could be classified into three types, namely, n: w> 3:1, n: w=3:1 and n: w<3:1. Some genetic factor was found to be responsible for the dis- torted segregation by influencing pollen competition to some extent and its function was independent of F_1 sterility gene. Considering that the distorted segregation showed distinct characterizations from the gametophyte genes reported hitherto, the authors postulated that it could be controlled by the interaction between sporophytic and gametophytic genes.
出处
《中国水稻科学》
CAS
CSCD
北大核心
1992年第2期89-92,共4页
Chinese Journal of Rice Science
关键词
异常分离
糯性基因
籼粳杂种
小稻
Distorted segregation
Waxy gene
Indica--japonica hybrids
