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Author Sugimoto,K., Takeuchi,Y., Ebana,K., Miyao,A., Hirochika,H., Hara,N., Ishiyama,K., Kobayashi,M., Ban,Y., Hattori,T. and Yano,M.
Title Molecular cloning of Sdr4, a regulator involved in seed dormancy and domestication of rice
Seed dormancy provides a strategy for flowering plants to survive adverse natural conditions. It is also an important agronomic trait affecting grain yield, quality, and processing performance. We cloned a rice quantitative trait locus, Sdr4, which contributes substantially to differences in seed dormancy between japonica (Nipponbare) and indica (Kasalath) cultivars. Sdr4 expression is positively regulated by OsVP1, a global regulator of seed maturation, and in turn positively regulates potential regulators of seed dormancy and represses the expression of postgerminative genes, suggesting that Sdr4 acts as an intermediate regulator of dormancy in the seed maturation program. Japonica cultivars have only the Nipponbare allele (Sdr4-n), which endows reduced dormancy, whereas both the Kasalath allele (Srd4-k) and Sdr4-n are widely distributed in the indica group, indicating prevalent introgression. Srd4-k also is found in the wild ancestor Oryza rufipogon, whereas Sdr4-n appears to have been produced through at least two mutation events from the closest O. rufipogon allele among the accessions examined. These results are discussed with respect to possible selection of the allele during the domestication process.
Journal Proc. Natl. Acad. Sci. U.S.A.
Country Japan
Volume 107(13)
Pages 5792-5797
Year 2010
PubMed ID 20220098
PubMed Central ID -
DOI 10.1073/pnas.0911965107
Gene EXPB3 GNP1 PIP1;3 PIP2;2 SDR4 VP1 _ _ _
INSD AB510199 AB506455
Strain Wild Core Collection -
Induced Mutation Lines(NIG Collection) -
Sterile Seed Strain -
Lethal Embryo
Mutantion Strain
Stages in Each Organ
- Muant Lines (Gene)
Cultivated Varieties(NIG Collection) -
Stages in Each Organ -