津原89×五优稻4号群体倒二叶相关性状数量遗传分析

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中图分类号：S511 文献标识码：A DOI编码：10.3969/j.issn.1006-6500.2025.08.003

Abstract：Ivestigatingthegneticofpenultimateleavesinicetoprovideatheoreticalbasisforbredingimprovedriceplantch tecture，this study conducted a quantitative genetic analysis using an F2 population derived from a cross between Jingyuan 89 and Wuyoudao4riceultivars.Fivefunctionaltraitsofthepenultimateleaveswereanalyzedforcorelations，andtheirheritabilitywas calculatedbasedonamajorgene-polygenemixedinheritancemodel.Theresultsshowedthatleafareaofthepenultimateleffitted Model A_4，with amajor gene heritabilityof 34.43% .Leaftipangle，penultimate leaf length，and leaf-stemangle followed Model B_1，exhibiting major gene heritabilities of 17.58% ， 88.41% ，and 16.83% ，respectively.Penultimate leaf width aligned with Model B_6，showing a major gene heritability of 26.80% .Inconclusion，the length of theleaf can serve asa key trait with stable inheritance inriceplant-typebreeding，whileteleaftipgleandleaf-stemanglerequreselectioninconjunctionwithnvironmentalltio. These findings provide critical insights for optimizing rice plant architecture breeding strategies.

Keywords：rice;penultimate leaf;quantitative genetic analysis; heritability

水稻是重要的粮食作物之一，为全球提供主要的粮食来源。（剩余5687字）