JGG 2002, 29(11): 995-1000 DOI:   ISSN: 1673-8527 CN: 11-5450/R           

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Molecular Mapping of Quantitative Trait Loci (QTL) for Characters of Vascular Bundles in Peduncle Related to indica-japonica Differentiation in Rice (Oryza sativa L.)

ZHANG Zhi-Hong1; LI Ping2; WANG Ling-Xia2; HU Zhong-Li1; ZHU Ying-Guo1; ZHU Li-Huang3

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,Winjiang,Sichuan 611130,China 3.Institute of Genetics and Developmental Biology,Chinese Academy of Science, Beijing 100101,China

Abstract

A doubled-haploid popualtion,consisting of 81 DH lines derived from the F1 hybrid of a cross between an indica cultivar and a japonica cultivar,was used to map quantitative trait loci (QTL) controlling numbers of vascular bundles in peduncle,primary rachis branches and the ratio of vascular bundles to primary rachis branches (V/R ratio). For vascular bundles, three QTL were detected. Among them, the QTL qVB-8 with the largest effect individually accounted for 31.1% of the total variation. Two QTL controlling primary rachis branches were identified and they were co-located with 2 of the 3 QTL for vascular bundles respectively. Three QTL for the V/R ratio were mapped on chromosome 1,2 and 8, respectively. Of the three QTL. 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 QTL 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. It was also shown that the chromosome region carrying the QTL qV/R-1 on chromosome 1 might play an important role in the processes of indica-japonica differentiation in rice.

Keywords indica-japonica differentiation in rice   vascular bundles in peduncle   RFLP marker   quantitative trait loci (QTL)  
Received 1900-01-01 Revised 1900-01-01 Online 2002-11-10 
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