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

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• 作者：Heng Ye ; Michael E. Foley ; Xing-You Gu
• 关键词：Seed dormancy ; Quantitative trait locus ; Weedy rice ; Domestication ; Germination
• 刊名：Plant Science
• 出版年：2010
• 出版时间：December 2010
• 年：2010
• 卷：179
• 期：6
• 页码：612-619
• 全文大小：664 K

文摘

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.