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New seed dormancy loci detected from weedy rice-derived advanced populations with major QTL alleles removed from the background

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Domestication of cereal crops from wild relatives tended to eliminate seed dormancy. Our objective was to identify all the detectable seed dormancy loci that differentiated between a weedy and a cultivated line of rice to understand the impact of domestication on distribution of dormancy genes. Three additional dormancy quantitative trait loci (QTLs) were identified from two BC₁F₁ plant-derived F₂ populations, in which the five previously known QTL-containing segments from the weedy rice donor were substituted by the genome of the recurrent parent. The three new QTLs that accounted for 8-11% phenotypic variance in the F₂s were confirmed with three BC₁F₂ plant-derived F₃ populations. Counting the seven previously identified QTLs, the parental lines differentiate at a total of ten dormancy loci that vary in dominance from dominant, partially dominant, co-dominant, to recessive types. The weedy and cultivated parents contribute dormancy alleles to eight and two of the ten loci, respectively. The two loci were newly detected. We concluded that a large proportion (8/10) of seed dormancy genes have been eliminated during domestication. The minor proportion (2/10) of dormancy genes retained in cultivars could be masked by those with a relatively large effect in a primary segregating population.
Ye, Heng , Foley, Michael E. , Gu, Xing-You
Includes references
Plant science 2010 Dec., v. 179, no. 6
Elsevier Science Ireland Ltd.
Journal Articles, USDA Authors, Peer-Reviewed
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