Journal Article

<i>MAA3</i> (<i>MAGATAMA3</i>) Helicase Gene is Required for Female Gametophyte Development and Pollen Tube Guidance in <i>Arabidopsis thaliana</i>

Kentaro K. Shimizu, Toshiro Ito, Sumie Ishiguro and Kiyotaka Okada

in Plant and Cell Physiology

Published on behalf of Japanese Society of Plant Physiologists

Volume 49, issue 10, pages 1478-1483
Published in print October 2008 | ISSN: 0032-0781
Published online October 2008 | e-ISSN: 1471-9053 | DOI: http://dx.doi.org/10.1093/pcp/pcn130
MAA3 (MAGATAMA3) Helicase Gene is Required for Female Gametophyte Development and Pollen Tube Guidance in Arabidopsis thaliana

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The female gametophyte plays a central role in the sexual reproduction of angiosperms. We previously isolated the maa3 (magatama3) mutant of Arabidopsis thaliana, defective in development of the female gametophyte, micropylar pollen tube guidance, and preventing the attraction of multiple pollen tubes. We here observed that the nucleolus of polar nuclei is small, and that the fusion of polar nuclei often did not occur at the time of pollination. The MAA3 gene encodes a homolog of yeast Sen1 helicase, required for RNA metabolism. It is suggested that MAA3 may regulate RNA molecules responsible for nucleolar organization and pollen tube guidance.

Keywords: Arabidopsis thaliana; Female gametophyte; magatama3 (maa3); Nucleolus; Pollen tube guidance; Sen1 RNA helicase

Journal Article.  3129 words.  Illustrated.

Subjects: Biochemistry ; Molecular and Cell Biology ; Plant Sciences and Forestry

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