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Plant and Cell Physiology Advance Access originally published online on March 25, 2006
Plant and Cell Physiology 2006 47(6):784-787; doi:10.1093/pcp/pcj039
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Short Communication

Abolition of the Tapetum Suicide Program Ruins Microsporogenesis

Takahiro Kawanabe1, Tohru Ariizumi1, Maki Kawai-Yamada2, Hirofumi Uchimiya2 and Kinya Toriyama1,*

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

* Corresponding author: E-mail, torikin{at}bios.tohoku.ac.jp; Fax, +81 22 717 8834.

Microsporogenesis in angiosperms 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 report herein 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.

(Received January 11, 2006; Accepted March 17, 2006)
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