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Plant and Cell Physiology Advance Access published online on March 8, 2005
Plant and Cell Physiology, doi:10.1093/pcp/pci080
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Plant and Cell Physiology 2005 © The Japanese Society of Plant Physiologists (JSPP); all rights reserved.
Received December 5, 2004
Accepted February 21, 2005

Short Communication

Expression of the Floral B-Function Gene SLM2 in Female Flowers of Silene latifolia Infected with the Smut Fungus Microbotryum violaceum

Yusuke Kazama 1*, Ayako Koizumi 1, Wakana Uchida 1, Amr Ageez 1, and Shigeyuki Kawano 1

1 Department of Integrated Biosciences, Graduate School of Frontier Sciences, University of Tokyo, FSB-601, 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8562, Japan

* To whom correspondence should be addressed.
Yusuke Kazama, E-mail: kk37505{at}mail.ecc.u-tokyo.ac.jp


  Abstract

Silene latifolia is a dioecious plant in which sex is determined by X and Y chromosomes. Expression of the B-function gene SLM2, an ortholog of PISTILLATA (PI) in Arabidopsis, was examined by in situ hybridization. SLM2 was not expressed in suppressed stamens of female flowers, but was expressed in developing stamens of smut-infected female flowers. These results indicate that the control of SLM2 is independent of the presence of the Y chromosome. Smut-infected females provide a useful system for clarifying the relationship between the B-function gene and the sex determination factor.

Keywords: Dioecious plant; Flower development; Microbotryum violaceum; PISTILLATA; Silene latifolia; smut fungus.
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