The qSD12 locus controls offspring tissue-imposed seed dormancy in rice.

Genetics
Xing-You GuMichael E Foley

Abstract

Seed component structures were grouped into maternal and offspring (embryo and endosperm) tissues to characterize a dormancy quantitative trait locus (QTL) for tissue-specific function using a marker-assisted genetic approach. The approach was devised to test if genotypic/allelic frequencies of a marker tightly linked to the QTL deviate from Mendelian expectations in germinated and nongerminated subpopulations derived from a segregation population of partially after-ripened seeds and was applied to the dormancy QTL qSD12 and qSD7-1 in a nearly isogenic background of rice. Experimental results unambiguously demonstrated that qSD12 functions in the offspring tissue(s) and suggested that qSD7-1 may control dormancy through the maternal tissues. These experiments also provide the first solid evidence that an offspring tissue-imposed dormancy gene contributes to the segregation distortion in a mapping population developed from partially after-ripened seeds and, in part, to the germination heterogeneity of seeds from hybrid plants. Offspring and maternal tissue-imposed dormancy genes express in very early and late stages of the life cycle, respectively, and interact to provide the species with complementary adaptation strategies. The...Continue Reading

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Citations

Feb 11, 2010·TAG. Theoretical and applied genetics. Theoretische und angewandte Genetik·Kiyosumi HoriMasahiro Yano
Jul 4, 2009·The Plant Cell·Carlos Alonso-BlancoMaarten Koornneef
Aug 13, 2010·TAG. Theoretical and applied genetics. Theoretische und angewandte Genetik·Jason ArgyrisKent J Bradford
Jun 30, 2010·Molecular Ecology·Carrie S ThurberAna L Caicedo

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