Journal Article

A <i>SUPERMAN</i>-like Gene is Exclusively Expressed in Female Flowers of the Dioecious Plant <i>Silene latifolia</i>

Yusuke Kazama, Makoto T. Fujiwara, Ayako Koizumi, Kiyoshi Nishihara, Rie Nishiyama, Etsuko Kifune, Tomoko Abe and Shigeyuki Kawano

in Plant and Cell Physiology

Published on behalf of Japanese Society of Plant Physiologists

Volume 50, issue 6, pages 1127-1141
Published in print June 2009 | ISSN: 0032-0781
Published online April 2009 | e-ISSN: 1471-9053 | DOI: http://dx.doi.org/10.1093/pcp/pcp064
A SUPERMAN-like Gene is Exclusively Expressed in Female Flowers of the Dioecious Plant Silene latifolia

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  • Biochemistry
  • Molecular and Cell Biology
  • Plant Sciences and Forestry

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To elucidate the mechanism(s) underlying dioecious flower development, the present study analyzed a SUPERMAN (SUP) homolog, SlSUP, which was identified in Silene latifolia. The sex of this plant is determined by heteromorphic X and Y sex chromosomes. It was revealed that SlSUP is a single-copy autosomal gene expressed exclusively in female flowers. Introduction of a genomic copy of SlSUP into the Arabidopsis thaliana sup (sup-2) mutant complemented the excess-stamen and infertile phenotypes of sup-2, and the overexpression of SlSUP in transgenic Arabidopsis plants resulted in reduced stamen numbers as well as the suppression of petal elongation. During the development of the female flower in S. latifolia, the expression of SlSUP is first detectable in whorls 2 and 3 when the normal expression pattern of the B-class flowering genes was already established and persisted in the stamen primordia until the ovule had matured completely. In addition, significant expression of SlSUP was detected in the ovules, suggestive of the involvement of this gene in ovule development. Furthermore, it was revealed that the de-suppression of stamen development by infection of the S. latifolia female flower with Microbotryum violaceum was accompanied by a significant reduction in SlSUP transcript levels in the induced organs. Taken together, these results demonstrate that SlSUP is a female flower-specific gene and suggest that SlSUP has a positive role in the female flower developmental pathways of S. latifolia.

Keywords: Dioecious plant; Female flower specific expression; Floral development; Silene latifolia; SUPERMAN

Journal Article.  9009 words.  Illustrated.

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

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