遗传背景对无花粉型水稻温敏核不育系籼S杂交后代不育性表达的影响研究

将无花粉型温敏核不育系籼S与不同父本杂交,在籼S不育期内调查F2和BC1F2育性分离.结果表明:8个组合F2及BC1F2群体不育株数∶可育株数均符合1∶3,符合1对主效基因控制的遗传模式;无花粉败育方式可以稳定遗传,但遗传背景会对出现无花粉败育的时间产生影响;各组合F2不育株的不育期长短及可育期育性的差异均达到显著水平,且各组合不同单株间也存在差异;13个组合的不育株不育期长短与可育期育性的相关性差异较大,其中,籼S/金华占、籼S/籼黄占、籼S/新小占、籼S/野绿占、籼S/密粒早占等5个组合达到显著负相关水平.

Effect of Genetic Backgrounds on Sterility Expression of Filial Generation Derived from a Thermo-Sensitive Genic Male Sterile Line of Non-Pollen Type XianS in Rice

XianS is a thermo-sensitive genic male sterile line of non-pollen type in rice and a mutant from a traditional variety Xianhuangzhan.The effects of genetic backgrounds on sterility expression of filial generations of XianS were studied by cross of XianS with several parental lines.The results were as follows:during the sterile period of XianS,the rate of sterile plants to fertile plants followed 1∶ 3 in generation F2 and BC1F2 of 8 combinations.The sterility of XianS was controlled by one pair of major genes and the type of pollen abortion could be inherited.However,the time of appearance of non-pollen abortion could be affected by genetic backgrounds.Analysis of variance showed that the variance of days of sterile period and fertile period for sterile plants from F2 of different combinations was significant,and the variance of different plants in the same combination was obvious.The relationship between days of sterile period and fertile period for sterile plants from F2 of 8 combinations was negatively correlated,and the correlation of XianS/Jinhuazhan,XianS/Xianhuangzhan,XianS/Xinxiaozhan,XianS/Yeluzhan,XianS/Minizaozhan was significant.