Identification of quantitative trait loci controlling heading date in rice using a high-density linkage map |
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Authors: | M Yano Y Harushima Y Nagamura N Kurata Y Minobe T Sasaki |
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Institution: | (1) Rice Genome Research Program (RGP), National Institute of Agrobiological Resources, Tsukuba, Ibaraki 305, Japan Fax: +81-298-38-7468 or +81-298-38-2302 e-mail: myano@abr.affrc.go.jp, JP;(2) Institute of Society for Techno-innovation of Agriculture, Forestry and Fisheries, Tsukuba, Ibaraki 305, Japan, JP |
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Abstract: | 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.
Received: 18 March 1997 / Accepted: 24 June 1997 |
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Keywords: | RFLP markers Days-to-heading QTL analysis Rice Epistatic interaction |
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