Molecular cloning of Sdr4, a regulator involved in seed dormancy and domestication of rice

  • Sugimoto K
  • Takeuchi Y
  • Ebana K
 et al. 
  • 110

    Readers

    Mendeley users who have this article in their library.
  • 104

    Citations

    Citations of this article.

Abstract

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.

Get free article suggestions today

Mendeley saves you time finding and organizing research

Sign up here
Already have an account ?Sign in

Find this document

Authors

  • K. Sugimoto

  • Y. Takeuchi

  • K. Ebana

  • A. Miyao

  • H. Hirochika

  • N. Hara

Cite this document

Choose a citation style from the tabs below

Save time finding and organizing research with Mendeley

Sign up for free