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Plant and Cell Physiology Advance Access first published online on March 31, 2008
This version published online on April 3, 2008
Plant and Cell Physiology, doi:10.1093/pcp/pcn050
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© The Author 2008. Published by Oxford University Press on behalf of Japanese Society of Plant Physiologists. All rights reserved. For Permissions, please e-mail: journals.permissions@oxfordjournals.org

Unequal Genetic Redundancy of Rice PISTILLATA Orthologs, OsMADS2 and OsMADS4, in Lodicule and Stamen Development

Shan-Guo Yao, Shinnosuke Ohmori, Mayumi Kimizu and Hitoshi Yoshida*

Hokuriku Research Center, National Agricultural Research Center, Niigata 943-0193, Japan

* Corresponding author: Dr. Hitoshi Yoshida, Hokuriku Research Center, National Agricultural Research Center, Jo-etsu, Niigata 943-0193, Japan, Tel: +81-25-526-8251, Fax: +81-25-524-8578, E-mail: yocida@affrc.go.jp


  Abstract

Although two homologs of PISTILLATA, OsMADS2 and OsMADS4, have been identified in the rice genome, their roles in floral organ development are controversial. Here, we demonstrate that the two genes show unequal redundancy of class-B function. Although OsMADS2 plays the important role in lodicule development, OsMADS4 also supports specification of lodicule identity. On the other hand, the two genes are almost equally important in stamen development. Consistent with their redundant function, both OsMADS2 and OsMADS4 interact with SPW1, the unique rice AP3 ortholog.

Keywords: OsMADS2 - OsMADS4 - redundancy - SPW1 - lodicule - stamen

(Received February 27, 2008; Accepted March 25, 2008)
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