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Plant and Cell Physiology Advance Access published online on March 25, 2006
Plant and Cell Physiology, doi:10.1093/pcp/pcj039
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Plant and Cell Physiology 2006 © The Japanese Society of Plant Physiologists (JSPP); all rights reserved.
Received January 11, 2006
Accepted March 17, 2006

Short Communication

Abolition of Tapetum Suicide Program Ruins Microsporogenesis

Takahiro Kawanabe 1, Tohru Ariizumi 1, Maki Kawai-Yamada 2, Hirofumi Uchimiya 2, and Kinya Toriyama 1 *

1 Laboratory of Environmental Biotechnology, Graduate School of Agricultural Science, Tohoku University, Sendai 981-8555, Japan
2 Institute of Molecular and Cellular Biosciences, The university of Tokyo, Tokyo 113-0032, Japan

* To whom correspondence should be addressed.
Kinya Toriyama, E-mail: torikin{at}bios.tohoku.ac.jp


  Abstract

Microsporogenesis in angiosperm takes places within the anther. Microspores are surrounded by a layer of cells, the tapetum, which degenerates during the later stages of pollen development with cytological features characteristic of programmed cell death (PCD). We herein report that the expression of AtBI-1, which suppresses Bax-induced cell death, in the tapetum at the tetrad stage inhibits tapetum degeneration and subsequently results in pollen abortion, while activation of AtBI-1 at the later stage does not. Our results demonstrate that the PCD signal commences at the tetrad stage and that the proper timing of PCD in the tapetum is essential for normal microsporogenesis.

Keywords: Arabidopsis thaliana; microsporogenesis; pollen development; programmed cell death; tapetum.
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