Abstract:

An eui(elongated uppermost internode) mutant was found from wild type of Luoshami, in which the uppermost internodes contribute to the variation of plant height. The eui mutation also resulted in significant increase in flag leaf and grain length. The crosses from mutant type/wild type, wild type/mutant type, mutant type/Jinhui 10 and mutant type/Jin 1B expressed normal uppermost internodes in F₁, and segregated differently in F₂(ratio of normal to eui was 3∶1 in F₂ between wild and mutant type, and 13∶3 in F₂ between mutant type and Jinhui 10, Jin 1B). Inheritance analysis indicated that the eui character is controlled by not only a major effective gene but also an inhibited gene. Two genetic systems were proposed to explain the hereditary behaviors. One was that the eui character is controlled by a dominant major gene of Eui and the Eui gene is inhibited by a dominant gene I, and the other was the eui character is controlled by a recessive major gene of eui and the eui gene is inhibited by a recessive gene i.

Key words: elongated upmost internode, genetic analysis, genotype, rice, mutant

摘要： 在罗沙米的自然群体中发现一种隐性高秆突变体，秆型分析表明,突变体的株高增加主要是倒1节间伸长所致，属最上节间伸长型，是一种长穗颈突变。该突变还引起了剑叶和粒长发生显著变化。突变体/野生型、野生型/突变体的F1代全部为正常穗颈，F2代正常穗颈与长穗颈之比为3∶1；突变体/缙恢10号、缙1B/突变体的F1代全部为正常穗颈，F2代正常穗颈与长穗颈之比为13∶3。遗传分析结果表明,除主要基因外，高秆性状的遗传还受到一对抑制基因的作用，有两种遗传模式可解释该突变体的遗传行为。

关键词: 长穗颈, 遗传分析, 基因型, 水稻, 突变体