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Identification and Analyses of Chromosome Segments Affecting Heterosis Using Chromosome-Segment Substitution Lines in Rice

文献类型： 外文期刊

作者： Peng, Xiaosong 1 ; He, Haohua 1 ; Zhu, Guoqiang 1 ; Jiang, Lin; Zhu, Changlan 1 ; Yu, Qiuying 1 ; He, Jun; Shen, Xi 1 ;

作者机构： 1.Jiangxi Agr Univ, Key Lab Crop Physiol Ecol & Genet Breeding, Minist Educ,Coll Agron, Southern Reg Collaborat Innovat Ctr Grain & Oil C, Nanchang 330045, Jiangxi, Peoples R China

2.Jiangxi Agr Univ, Key Lab Crop Physiol Ecol & Genet Breeding, Minist Educ,Coll Agron, Southern Reg Collaborat Innovat Ctr Gr

期刊名称：CROP SCIENCE （ 影响因子：2.319； 五年影响因子：2.631 ）

ISSN： 0011-183X

年卷期： 2017 年 57 卷 4 期

页码：

收录情况： SCI

摘要： A high level of heterosis exists in intersubspecific crosses between indica and japonica rice (Oryza sativa L.) cultivars, and the exploitation of heterosis has long been considered a promising method of increasing rice yield. To analyze the chromosome segments associated with heterosis for yield-related traits and to dissect the major heterosis quantitative trait loci (QTL) for marker-assisted selection in intersubspecific crosses to improve rice yield, we introduced a set of 37 chromosome-segment substitution lines (CSSLs), each of which carried one or a few chromosome segments of the indica rice cultivar Habataki, in the genetic background of the japonica rice cultivar Sasanishiki. The CSSLs were individually crossed with 'Changhui T025' to generate a set of corresponding F-1 hybrids (chromosome-segment substitution line hybrids, CSSLHs). These CSSLHs were field-tested for nine yield-related traits in two different environments, and 20 heterosis QTL were detected. These QTL were divided into two groups: the positive alleles of one group originated from the Habataki x Changhui T025 hybrid, whereas those of the other group originated from the Sasanishiki x Changhui T025 hybrid. This implied that many different genes that positively contribute to heterosis likely exist in indica and japonica cultivars. Four key heterosis QTL were identified in both environments: qHppp10 for panicle number per plant, qHph1-1 for plant height, qHtgw4-1 for 1000-grain weight, and qHdsp1 for spikelet density per plant. The indica x indica segments at these QTL represent good candidates for marker-assisted selection for the corresponding traits in intersubspecific crosses to improve yield. Moreover, the CSSLs harboring these QTL represent candidate parents of F-1 hybrids along with Changhui T025 or other indica lines.

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