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Plant and Cell Physiology Advance Access published online on March 31, 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

Two homologs of PISTILLATA have been identified in rice: OsMADS2 and OsMADS4. However, their roles in floral organ development are controversial. Here, we demonstrate that the genes show unequal redundancy of class-B function. Although OsMADS2 plays an important role in lodicule development, OsMADS4 also supports the specification of lodicule identity. In contrast, the genes are roughly equally important in stamen development. Consistent with their redundant functions, both OsMADS2 and OsMADS4 interact with the unique rice AP3 ortholog SPW1.

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

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