Mapping quantitative trait loci controlling seed dormancy and heading date in rice, Oryza sativa L., using backcross inbred lines |
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Authors: | S Y Lin T Sasaki M Yano |
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Institution: | (1) Rice Genome Research Program, Institute of Society for Techno-Innovation of Agriculture, Forestry and Fisheries, 446-1, Ippaizuka, Kamiyokoba, Tsukuba, Ibaraki 305 Japan, JP;(2) Rice Genome Research Program, National Institute of Agrobiological Resources, 2-1-2, Kannondai, Tsukuba, Ibaraki 305 Japan Fax: +81-298-38-7468 or +81-298-38-2302 E-mail: myano@abr.affrc.go.jp, JP |
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Abstract: | To detect quantitative trait loci (QTLs) controlling seed dormancy, 98 BC1F5 lines (backcross inbred lines) derived from a backcross of Nipponbare (japonica)/Kasalath (indica)//Nipponbare were analyzed genetically. We used 245 RFLP markers to construct a framework linkage map. Five putative QTLs
affecting seed dormancy were detected on chromosomes 3, 5, 7 (two regions) and 8, respectively. Phenotypic variations explained
by each QTL ranged from 6.7% to 22.5% and the five putative QTLs explained about 48% of the total phenotypic variation in
the BC1F5 lines. Except for those of the QTLs on chromosome 8, the Nipponbare alleles increased the germination rate. Five putative
QTLs controlling heading date were detected on chromosomes 2, 3, 4, 6 and 7, respectively. The phenotypic variation explained
by each QTL for heading date ranged from 5.7% to 23.4% and the five putative QTLs explained about 52% of the total phenotypic
variation. The Nipponbare alleles increased the number of days to heading, except for those of two QTLs on chromosomes 2 and
3. The map location of a putative QTL for heading date coincided with that of a major QTL for seed dormancy on chromosome
3, although two major heading-date QTLs did not coincide with any seed dormancy QTLs detected in this study.
Received: 10 October 1997 / Accepted: 12 January 1998 |
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Keywords: | Rice Seed dormancy Heading date Backcross inbred line QTL analysis |
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