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doi:10.1534/genetics.105.049155
A more recent version of this article appeared on February 1, 2006.
REGULAR RESEARCH PAPERS |
Dormancy Genes from Weedy Rice Respond Divergently to Seed Development Environments
Xing-You Gu 1*, Shahryar F. Kianian 1 and Michael E. Foley 2
1 North Dakota State University
2 USDA-ARS
* To whom correspondence should be addressed. E-mail: gux{at}fargo.ars.usda.gov.
Submitted on August 3, 2005
Revised on October 9, 2005
Accepted on 18 October 2005
Genes interacting with seed developmental environments control primary dormancy. To understand how a multigenic system evolved to adapt to the changing environments in weedy rice, we evaluated genetic components of three dormancy QTLs in a synchronized non-dormant genetic background. Two genetically identical populations segregating for qSD1, qSD7-1, and qSD12 were grown in greenhouse and natural conditions differing in temperature, relative humidity, and light intensity during seed development. Low temperatures tended to enhance dormancy in both conditions. However, genotypes responded to the environments divergently so that two populations displayed similar distributions for germination. Additive and/or dominance effects of the three loci explained about 90% of genetic variances and their epistases accounted for the remainder in each environment. The qSD1 and qSD7-1 main effects were increased, while the qSD12 additive effect was decreased by relatively low temperatures. Both gene main and epistatic effects were involved in G-by-E interactions, which in magnitude were greater than environmental main effect. The divergent responses of dormancy genes observed in this simple multigenic system presumably have selective advantages in natural populations adapted to changing environments and hence represent a genetic mechanism stabilizing the dormancy level of weedy rice ripened in different seasons or temperature regimes.
Key Words: Adaptive genetic variation, Dormancy, Epistasis, Genotype by environment interaction, Weedy rice
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  X.-Y. Gu, E. B. Turnipseed, and M. E. Foley The qSD12 Locus Controls Offspring Tissue-Imposed Seed Dormancy in Rice Genetics, August 1, 2008; 179(4): 2263 - 2273. [Abstract] [Full Text] [PDF]
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