Assembling seed dormancy genes into a system identified their effects on seedbank longevity in weedy rice.

Heredity
Wirat PipatpongpinyoXing-You Gu

Abstract

Seed dormancy (SD) and longevity (SL) may share developmental and genetic mechanisms, as both traits are developed in the same maternal environment and evolved to coordinate the timing of germination and the life span of seedbanks. To test the hypothesis, allelic variants at the SD1-2, 7-1, 7-2, and 12 loci from weedy and cultivated rice (Oryza sativa) were assembled into the same genetic background, and 16 homozygous lines selected as a tetragenic system. These lines were evaluated for SD measured by germination at 7, 21, 35, and 150 days of after-ripening (DAR), and for SL measured by the seed decay rate and survivability in the soil of a rice field for 7 months. Pyramiding the alleles from weedy rice lengthened the dormancy duration, and seeds survived in the soil remained dormant at the excavation. Germination levels at 7 to 150 DAR were correlated positively with the seed decay rate (r = 0.41-0.53) and negatively with the survivability (r = -0.45 to -0.28) in the tetragenic system. All four loci contributed to genotypic variation for each of the SD and SL measurements through main and/or epistatic (two- to four-order interactions) effects. SD7-1 (identical to the pericarp color gene Rc) played a major role in regulating se...Continue Reading

References

Oct 5, 2001·Nature Reviews. Genetics·G S Khush
May 10, 2011·Trends in Genetics : TIG·Jill T AndersonThomas Mitchell-Olds
Oct 23, 2012·Plant Physiology·Thu-Phuong NguyenLeónie Bentsink
Apr 23, 2013·G3 : Genes - Genomes - Genetics·Muhamad S MispanXing-You Gu
Sep 1, 2010·Evolutionary Applications·Norman C EllstrandCaroline E Ridley
Dec 8, 2015·Plant & Cell Physiology·Naoto SanoMitsunori Seo
Apr 10, 2017·Journal of Experimental Botany·William E Finch-Savage, Steven Footitt

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BETA
genotyping

Software Mentioned

SAS GLM
REG
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