Journal
PLANT SCIENCE
Volume 179, Issue 6, Pages 612-619Publisher
ELSEVIER IRELAND LTD
DOI: 10.1016/j.plantsci.2010.04.003
Keywords
Seed dormancy; Quantitative trait locus; Weedy rice; Domestication; Germination
Categories
Funding
- National Science Foundation [0641376]
- United States Department of Agriculture National Research Initiative [2008-35301-19058]
- NIFA [583579, 2008-35301-19058] Funding Source: Federal RePORTER
- Direct For Biological Sciences
- Division Of Integrative Organismal Systems [0641376] Funding Source: National Science Foundation
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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 F-2 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 F(2)s were confirmed with three BC1 F-2 plant-derived F-3 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. Published by Elsevier Ireland Ltd.
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