RICE SCIENCE ›› 2011, Vol. 18 ›› Issue (4): 287-296.

• Research Paper • Previous Articles     Next Articles

Genetic Analysis of Heading Date of Japonica Rice Cultivars in Southwest China

  1. 1State Key Laboratory of Crop Genetics and Germplasm Enhancement, Nanjing Agricultural University, Nanjing 210095, China; 2Lianyungang Academy of Agricultural Sciences, Lianyungang 222006, China; 3Institute of Crop Sciences, Chinese Academy of Agricultural Sciences, Beijing 100081, China; # These authors contributed equally to this paper
  • Online:2011-12-28 Published:2011-10-13
  • Contact: WAN Jian-min
  • Supported by:

    the National Natural Science Foundation of China (Grant No. 30871497), the National High Technology Research and Development Program of China (Grant No. 2009AA101101), the Program of Introducing Talents of Discipline to University (Grant No. B08025).

Abstract: Heading dates of 26 native japonica rice cultivars in Southwest China were investigated, and their basic vegetative growth (BVG), photoperiod-sensitivities (PS) and temperature-sensitivities (TS) were analyzed under artificial short-day and natural long-day conditions in Nanjing, as well as artificially high temperature and naturally low temperature conditions in winter in Hainan. The results showed that the PS and TS varied among different cultivars. The BVGs of all the japonica cultivars were well situated, but differed within cultivars. Regression analysis showed a significant correlation between heading date and PS, indicating that PS was the main factor affecting heading date of japonica cultivars in Southwest China. Genetic analyses were conducted on these 26 cultivars using a set of heading date near isogenic lines as test lines. All the japonica cultivars carried the dominant early-heading gene Ef-1or Ef-1t, and most of these cultivars carried the dominant photoperiod sensitivity allele E1 or E1t, the PS of which was slightly weaker than E1. For the Se-1 locus, these cultivars mainly carried recessive photoperiod insensitivity gene Se-1e. In addition, the PS of 22 japonica varieties could be repressed or weakened by the recessive allele hd2, inhibiting the expression of E1 and Se-1. These results indicated that the heading date genotypes determined different PS and well situated BVG in japonica rice cultivars in Southwest China.

Key words: rice, heading date, genetic analyses, photoperiod sensitivity, temperature sensitivity, basic vegetative growth