A double haploid (DH) population of rice ( Oryza sativa L.) derived from anther culture of ZYQ8/JX17, a typical indica and japonica hybrid, was used for genetic analysis of rice peduncle vascular system and panicle traits. The number of large vascular bundles (LVB), the number of small vascular bundles (SVB) in the peduncle, and the panicle traits including the number of primary rachis branches (PRB), the number of spikelets per panicle (SNP), peduncle top diameter (PTD), and panicle length (PL) were investigated in the parents and DH lines. The quantitative trait loci (QTLs) for each trait were analyzed based on the constructed molecular linkage map of this population. Three QTLs for LVB (qLVB 1, qLVB 6 and qLVB 7) were detected on chromosomes 1, 6, and 7, respectively. Two putative QTLs for SVB (qSVB 4 and qSVB 6) were mapped on chromosomes 4 and 6 respectively. Four QTLs (qPRB 4a, qPRB 4b, qPRB 6 and qPRB 7) on chromosomes 4, 6, and 7, respectively, were detected for PRB. Three QTLs (qSPN 4a, qSPN 4b and qSPN 6) were identified on chromosomes 4 and 6, respectively, which could significantly affect SPN. Five QTLs for PTD (qPTD 2, qPTD 5, qPTD 6, qPTD 8 and qPTD 12) were identified on chromosomes 2, 5, 6, 8, and 12, respectively. Three QTLs for PL (qPL 4, qPL 6 and qPL 8) were detected on chromosomes 4, 6, and 8, respectively. Clustering of QTLs, such as qLVB 6, qSVB 6, qSNP 6, qPTD 6, and qPL 6 detected in the interval G122 G1314b on chromosome 6, was found. These results suggest that some QTLs for peduncle vascular bundle system are possibly responsible for the panicle traits.
水稻穗颈维管束及穗部性状的
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