Journal Article

Abolition of the Tapetum Suicide Program Ruins Microsporogenesis

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

in Plant and Cell Physiology

Published on behalf of Japanese Society of Plant Physiologists

Volume 47, issue 6, pages 784-787
Published in print June 2006 | ISSN: 0032-0781
Published online June 2006 | e-ISSN: 1471-9053 | DOI: http://dx.doi.org/10.1093/pcp/pcj039
Abolition of the Tapetum Suicide Program Ruins Microsporogenesis

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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.

Keywords: Arabidopsis thaliana; Microsporogenesis; Pollen development; Programmed cell death; Tapetum; AtBI-1, Arabidopsis thaliana ortholog of Bax inhibitor-1; BI-1, Bax inhibitor-1; ER, endoplasmic reticulum; PCD, programmed cell death; TUNEL, terminal deoxynucleotidyltransferase-mediated dUTP nick end-labeling

Journal Article.  2384 words.  Illustrated.

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

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