Abstract
The objective of the study is to dissect the genetic basis of seed dormancy. The weedy rice “Ludao” ( Oryza sp.) with strong seed dormancy was crossed with the rice variety Akihikari ( O. sativa subsp. japonica) and 215 lines of BC 1F 1 were developed for QTL mapping. A total of 4 quantitative trait loci (QTLs) associated with seed dormancy were located on chromosomes 1, 2, 6, and 6, explaining 7.8, 7.1, 5.5, and 4.5% of the overall phenotypic variance, respectively. The QTL, qSD-2, on chromosome 2 appeared to represent a novel source of genetic variation for seed dormancy. A multi-way analysis of variance indicated that the gene action of the 4 QTLs was additive. There was significant negative correlation between the germination rate and the flowering time. A single heading date QTL was identified to be either pleiotropic or linked to a seed dormancy QTL on chromosome 6, thereby accounting for the observed correlation between seed dormancy and flowering time.
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