井冈红米米色的遗传研究

Study on Heredity of Seed Color in Jinggang Red Rice

[目的]了解井冈红米米色的遗传规律。[方法]用井冈红米品种红米3号与无色米品种蜀恢5279、311、R207作正反交,调查统计子代种子颜色及数量。[结果]结果表明:杂种F1种子颜色由其所着生的母本植株基因型决定。以红米3号做母本时,所结F1种子均为红色;以蜀恢5279、311、R207为母本时,所结F1种子均为无色。正反交F1所产生的F2种子均为红色。以红米3号做母本时,F3群体中红色种子的单株与无色种子的单株呈3∶1分离;以无色米做母本时,F3群体中红色种子的单株与无色种子的单株分离比接近3∶1,但红色种子的单株数低于期望值,无色种子的单株数高于期望值。F3群体中红米单株间米色程度存在差异。[结论]根据杂种F1、F2和F3代种子颜色和植株分离比例,井冈红米品种红米3号种子红色表现型由单显性基因控制,并受母性影响和微效基因的修饰作用。

[Objective]Tlie researeh aimed to study the heredity rules of Jinggang red rice seed color. [Method]Reciprocal crosses experiments were carried out between Jinggang red rice No.3 and achromatic rice Shuhui 527,9311, R207 . And the color and number of filial generations seeds were investigated and counted. [Result]The results revealed that the seed color of F1 was determined by its female parent. Furthermore, all F2 seeds displayed red phenotype. When Jinggang red rice No.3 was female , all F3 population plants segregated into red and achromarism phenotypic classes with ratio of 3：1. When acluomatte rice as Shuhui 527,9311,R207 were female, the number of red phenotypic plants in F3 population was less than that was expected with ratio of 3：1, whether the number of achromatism phenotypic plants was more than that was expected. Furthermore, the degree of red seed color was different among red phenotypic plants in F3 population. [ Conclusion] It was suggested that the red phenotype of Jinggang red rice No.3 was determined by a dominant, manogene with maternal effect and modified by minor gene