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Acta Agron Sin ›› 2008, Vol. 34 ›› Issue (05): 737-742.doi: 10.3724/SP.J.1006.2008.00737

• CROP GENETICS & BREEDING · GERMPLASM RESOURCES · MOLECULAR GENETICS • Previous Articles     Next Articles

Mapping QTL for Seed Dormancy in Weedy Rice

JING Wen1,JIANG Ling1,ZHANG Wen-Wei1,ZHAI Hu-Qu2,WAN Jian-Min13*   

  1. 1 State Key Laboratory for Crop Genetics and Germplasm Enhancement / Jiangsu Plant Gene Engineering Research Center, Nanjing Agricultural
    University, Nanjing 210095, Jiangsu; 2 Chinese Academy of Agricultural Sciences, Beijing 100081; 3 Institute of Crop Sciences, Chinese Academy of
    Agricultural Sciences, Beijing 100081, China
  • Received:2007-10-16 Revised:1900-01-01 Online:2008-05-12 Published:2008-05-12
  • Contact: WAN Jian-Min

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Abstract: The genetic basis of the seed dormancy of a weedy rice was dissected using a segregation population derived from a cross with a japonica cultivar. Two QTLs were located on chromosomes 1 and chromosomes 2, and two on chromosome 6. These QTLs explained 7.8%, 7.1%, 5.5%, and 4.5% of the overall phenotypic variance, respectively. The QTL on chromosome 2 appears to represent a novel source of genetic variation for seed dormancy. A multi-way analysis of variance indicated that the gene action of these four QTLs was additive. A significant negative correlation was found between germination rate and flowering time. A single heading date QTL was identified, to be either pleiotropic on or linked to a seed dormancy QTL on chromosome 6, thereby accounting for the observed correlation between seed dormancy and flowering time.

Key words: Weedy rice, Seed dormancy, Heading date, Quantitative trait locus (QTL)

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