RICE SCIENCE ›› 2012, Vol. 19 ›› Issue (4): 269-276.

• Research Paper • Previous Articles     Next Articles

Identification and Fine Mapping of Heading Date Related Mutant in Rice

  1. 1College of Chemistry and Life Science, Zhejiang Normal University, Jinhua 321004, China; 2Institute of Crop and Nuclear Technology Utilization, Zhejiang Academy of Agricultural Sciences, Hangzhou 310021, China; 3College of Life and Environment Sciences, Hangzhou Normal University, Hangzhou 310036, China. # These authors contributed equally to this work
  • Online:2012-12-28 Published:2012-10-15
  • Contact: ZHANG Xiao-ming
  • Supported by:

    This work was supported by the Chinese Ministry of Agriculture (Grant Nos. 200803034 and 2011ZX08001- 001), the Zhejiang Provincial and the National Natural Science Foundation of China (Grant Nos. Y3080361 and 31071207), the Science and Technology Department of Zhejiang Province, China (Grant No. 2004C12020), the Special Fund for Agro-scientific Research in the Public Interest (Grant No. 201103007), and the Special Fund of Zhejiang Academy of Agricultural Science, China.

Abstract: A rice heading-date-related mutant was isolated from a 60Co-γ-ray-induced mutation pool of Zhejing 22, a conventional japonica cultivar in Zhejiang Province, China. The mutant was characterized by a delayed heading date of almost 20 d longer than the wild type plant. Genetic analysis revealed that the mutation was controlled by a single nuclear-encoded recessive gene that was designed as HD(t) (heading date tentatively). To isolate the HD(t) gene, a map-based cloning approach was employed using 479 F2 mutant individual plants derived from the cross between the hd(t) mutant (japonica) × Zhenshan 97 (indica). Finally, the HD(t) gene was mapped to an approximate 53 kb region between the InDel markers of 10-61W and 10-66W on chromosome 10. According to the genome sequence of Nipponbare, the target region contains 11 annotated genes. It is helpful for future cloning of HD(t) gene based on this fine mapping results.

Key words: 60Co-γ-ray-induced, late heading date, flowering, SSR, InDel marker, fine mapping