Identification of quantitative trait loci controlling heading date in rice using a high-density linkage map

M. Yano, Y. Harushima, Y. Nagamura, N. Kurata, Y. Minobe and T. Sasaki
Theoretical and Applied Genetics, 1997, 95(7): 1025-1032     追溯原文......本站官方QQ群:62473826
RFLP markers; Days-to-heading; QTL analysis; Rice; Epistatic interaction

Quantitative trait locus (QTL) analysis has been carried out to identify genes conferring heading date in rice. One hundred and eighty six F2 plants derived from a cross between a japonica variety, Nipponbare, and an indica variety, Kasalath, were used as a segregating population for QTL mapping and more than 850 markers were employed to identify QTLs. Scan-analysis revealed the existence of two QTLs with large effects, Hd-1 and Hd-2, one in the middle of chromosome 6 and one at the end of chromosome 7, respectively. For both loci, the Kasalath alleles reduced days-to-heading. In addition, three QTLs with minor effects, Hd-3, Hd-4 and Hd-5, were found to be located on chromosomes 6, 7 and 8 based on a secondary scan analysis which was carried out by removing the phenotypic effects of Hd-1 and Hd-2. For the three secondary loci, the Nipponbare alleles reduced days-to-heading. The five QTLs explained 84% of the total phenotypic variation in the F2 population based on a multiple-QTL model. The presence of a digenic interaction between Hd-1 and Hd-2 was clearly suggested.

  抽穗期基因 Hd1
  抽穗期基因 Hd-3
  抽穗期基因 Hd3b;
  抽穗期基因 Hd5
  成花素基因;抽穗期基因;生育期基因;光周期敏感基因;感光基因 Hd3a; FT
  抽穗期基因;光周期敏感基因 Hd-2
  抽穗期基因 Hd4;