Identification of quantitative trait loci (QTLs) for the characters of vascular bundles in peduncle related to indica-japonica differentiation in rice (Oryza sativa L.) |
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Authors: | Zhi-Hong Zhang Ping Li Ling-Xia Wang Chang-Jun Tan Zhong-Li Hu Ying-Guo Zhu Li-Huang Zhu |
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Institution: | (1) Key Laboratory of the Education Ministry of China for Plant Developmental Biology, College of Life Sciences, Wuhan University, Wuhan, 430072, China;(2) Rice Research Institute, Sichuan Agricultural University, Chengdu, 611130, China;(3) Institute of Genetics, Chinese Academy of Sciences, Beijing, 100101, China |
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Abstract: | The number of vascular bundles in peduncle and the ratio of vascular bundles to primary rachis branches (V/R ratio)distinguishable
between indica andjaponica, are the traits associated with the processes of differentiation between indica and japonica inrice (Oryza sativa L.). In this paper a doubled-haploid population derived from the F1 hybrid of a cross between anindica cultivar and a japonicacultivar was used to map quantitative trait loci(QTLs) controlling numbers of vascular bundles in peduncle, primary rachis
branches and the V/R ratio. For vascular bundles, three QTLs were detected and they collectively explained 58.8% of the total
variation. Among them, the QTLqVB-8 with the largest effect,located on chromosome 8, individually accounted for 31.1% of the total variation. Two QTLs controlling
primary rachis branches, located on chromosome 8and 10 respectively, were identified and they individually explained 10.5%
and18.0% of the total variation respectively. Three QTLs for the V/R ratio, mapped on chromosome 1, 2 and 8, respectively,jointly
explained 61.3% of the total variation. Of the three QTLs, the QTL qV/R-1 with the largest additive effect,explained 25.3% of the total variation,was located on chromosome 1 and found to be closely
linked to the gene sh-2, a major gene underlying grain-shattering ability. In addition, four and two pairs of significant epistatic QTLs were detected
for vascular bundles and the V/R ratio,respectively, but none for rachis branches. Our results suggested that the numbers
of vascular bundles and primary rachis branches were independently controlled by different polygenic systems, but the two
polygenic systems shared a fraction of quantitative trait loci. The present study also demonstrated that the chromosome region
carrying the QTL qV/R-1 for the V/R ratio and the gene sh-2 might play an important role in the processes ofindica-japonica differentiation in rice (Oryza sativa L.).
This revised version was published online in August 2006 with corrections to the Cover Date. |
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Keywords: | indica-japonica differentiation quantitative trait loci (QTLs) RFLP marker rice (Oryza sativa L ) vascular bundles in peduncle |
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