QTL Analysis for Flag Leaf Characteristics and Their Relationships with Yield and Yield Traits in Rice

YUE Bing , XUE Wei-Ya , LUO Li-Jun , XING Yong-Zhong
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引用次数: 130

Abstract

Photosynthesis of carbohydrate is the primary source of grain yield in rice (Oryza sativa L.). It is important to genetically analyze the morphological and the physiological characteristics of functional leaves, especially flag leaf, in rice improvement. In this study, a recombinant inbred population derived from a cross between an indica (O. sativa L. ssp. indica) cultivar and a japonica (O. sativa L. ssp. japonica) cultivar was employed to map quantitative traits loci (QTLs) for the morphological (i.e., leaf length, width, and area) and physiological (i.e., leaf color rating and stay-green) characteristics of flag leaf and their relationships with yield and yield traits in 2003 and 2004. A total of 17 QTLs for morphological traits (flag leaf length, width, and area), 6 QTLs for degree of greenness and 14 QTLs for stay-green-related traits (retention-degrees of greenness, relative retention of greenness, and retention of the green area) were resolved, and 10 QTLs were commonly detected in both the years. Correlation analysis revealed that flag leaf area increased grain yield by increasing spikelet number per panicle. However, the physiological traits including degree of greenness and stay-green traits were not or negatively correlated to grain yield and yield traits, which may arise from the negative relation between degree of greenness and flag leaf size and the partial sterility occurred in a fraction of the lines in this population. The region RM255-RM349 on chromosome 4 controlled the three leaf morphological traits simultaneously and explained a large part of variation, which was very useful for genetic improvement of grain yield. The region RM422-RM565 on chromosome 3 was associated with the three stay-green traits simultaneously, and the use of this region in genetic improvement of grain yield needs to be assessed by constructing near-isogenic lines.

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水稻旗叶性状及其与产量和产量性状关系的QTL分析
碳水化合物的光合作用是水稻籽粒产量的主要来源。对水稻功能叶特别是旗叶的形态和生理特性进行遗传分析是水稻改良的重要内容。在本研究中,由籼稻(O. sativa L. ssp.)和籼稻(O. sativa L. ssp.)杂交获得了一个重组自交系群体。籼稻)栽培品种和粳稻(O. sativa L. ssp.)。利用粳稻(japonica)品种2003年和2004年的旗叶形态特征(叶长、叶宽、叶面积)和生理特征(叶色等级、叶绿度)的数量性状位点(qtl)及其与产量和产量性状的关系。共解析了17个形态性状(旗叶长度、宽度和面积)qtl, 6个绿度性状qtl和14个绿度相关性状(绿度保持、相对绿度保持和绿面积保持)qtl,其中10个qtl在两个年份中都被普遍检测到。相关分析表明,旗叶面积通过增加每穗颖花数来提高籽粒产量。然而,绿度和保持绿度等生理性状与籽粒产量和产量性状不相关或呈负相关,这可能是由于该群体中部分品系的绿度与旗叶大小呈负相关,且部分品系出现部分不育。4号染色体rm255 ~ rm349区域同时控制了3个叶片形态性状,解释了大部分变异,对籽粒产量的遗传改良具有重要意义。3号染色体上的RM422-RM565区域与3个保持绿色性状同时相关,需要通过构建近等基因系来评估该区域在粮食产量遗传改良中的应用。
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