关键词: 遗传分析, 叶色, 紫叶水稻

Abstract: The purple rice plants OPL and PL184 were segregated from normal green rice varieties Ketan Nangka and W6184S in 1988 and 1990, respectively. No segregation appeared in the sequent two generations. Their agronomic traits were stable. These two kinds of purple rice plant were crossed with each other, F₁ and F₂ showed purple color and no separations were found, inferring that the two kinds of purple rice plant may have a same genotype. The two kinds of purple rice plant were crossed with 22 normal green color rice varieties, the F₁s were all green color. Investigations on the leaf color in seedling stage were conducted in 14 crosses. F₂s from the crosses between W9056S, W8013S and PL184 had ratios of 3:1 for green:purple, indicating one pair of genes differences between them. The ratios of green:purple in F₂s from the crosses between Shuangguang S, Zhenshan 97A, Mi'ai 64 S, Petai 64S, Yuetai A, W91273S and PL184 were 13:3, indicating the differences between them are based on two pairs of genes with one inhibitory gene. When the purple rice plants were crossed with W6068S. Annong S, 3285S, W91238S and E47S, the ratios of green:purle in F₂s were accorded with the model of 55:9, indicating the differences between them are based on 3 pair of genes with one inhibitory gene. F₂ from the cross HN5S/PL184 had a ratio of 229:27 for green:purple, making known the difference between them is based on 4 pairs of genes with one inhibitory gene. In the backcross Zhenshan 97A/PL184 PL184 and HN5S/PL184 PL184, the ratios of green:purple were 1:1. However, the ratio of green:purple in triple cross F₂ of Shuangguang S W9056S/PL184 was 113:15, indicating the inhibitory genes in W9056S and Shuangguang S are non-allelic. To sum up, the expression of purple leaf color in OPL and PL184 is probably controlled by 3 pairs of basic genes and 2 pairs of inhibitory genes. It is possible for combining the purple leaf color and PGMS or TGMS or CMS.

Key words: genetic analysis, leaf color, purple rice