Quantitative trait loci, epistasis and other interactions associated with dormancy in weedy rice (Oryza sativa l.)

M. E. Foley, X. Y. Gu, S. F. Kianian

Research output: Chapter in Book/Report/Conference proceedingChapter

1 Scopus citations


A wild weedy strain (i.e. SS18-2) of Oryza sativa L. was selected to investigate the geneticarchitecture underlying seed dormancy. A framework genetic map covering the whole ricegenome was constructed based on a backcross population (i.e. BC1 [EM93-1 (non-dormantbreeding line)//EM93-1/SS18-2]). Dormancy was determined by germination of seeds after1, 11 and 21 days after ripening (DAR). Six dormancy quantitative trait loci (QTLs), designatedas qSD4, 6, 7-1, 7-2, 8 and 12, were identified. The locus qSD7-1 was tightly linked tothe red pericarp colour gene Rc. In addition, the locus qSD4 was associated with an intervalimparting black hull colour. A QTL × DAR interaction was detected for qSD12, the locuswith the highest effect at 1, 11 and 21 DAR (R2 = 14%, 24% and 20%, respectively). Twoand more (i.e. three and four) orders of epistases were detected with four and all the sixQTLs, respectively. The higher-order epistases strongly suggest the presence of geneticallycomplex networks in the regulation of variation for seed dormancy in natural populations, and make it critical to select a favourable combination of alleles at multiple loci in positionalcloning of a target dormancy gene. Backcrossing techniques in combination with phenotypicand marker-assisted selection are being used to introduce the weedy rice-derived dormancylocus qSD7-1 into the EM93-1 genetic background to develop near isogenic lines for finemappingand positional cloning.

Original languageEnglish (US)
Title of host publicationSeeds
Subtitle of host publicationBiology, Development and Ecology
PublisherCABI Publishing
Number of pages8
ISBN (Print)9781845931971
StatePublished - Feb 27 2007


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