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JXB Advance Access originally published online on October 8, 2004
Journal of Experimental Botany 2004 55(408):2617-2623; doi:10.1093/jxb/erh275
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Journal of Experimental Botany, Vol. 55, No. 408, © Society for Experimental Biology 2004; all rights reserved

RESEARCH PAPER

Bcl-2 family members localize to tobacco chloroplasts and inhibit programmed cell death induced by chloroplast-targeted herbicides

Shaorong Chen and Martin B. Dickman*

Department of Plant Pathology, 406 Plant Sciences Hall, University of Nebraska, Lincoln, NE 68583-0722, USA

* To whom correspondence should be addressed. Fax: +1 402 472 2853. E-mail: mdickman{at}unlnotes.unl.edu

In mammalian cells, apoptosis is often mediated via organelles. While apoptotic-like cell death occurs in plants, the mechanistic details are unresolved. Transgenic tobacco plants have been generated that harbour selected animal anti-apoptotic genes. Subcellular fractionation followed by western blot analysis indicated that chloroplasts serve as a location for these animal anti-apoptotic proteins in addition to the established mitochondrial location. To explore the functional significance of this observation, tobacco plants were treated with three chloroplast-directed herbicides. Wild-type plants died and exhibited features associated with apoptosis. Transgenic plants survived and did not show any apoptotic-like characteristics. Moreover, the herbicide-induced apoptotic-like cell death was light requiring. It was concluded that chloroplasts may be involved in mediating certain types of plant programmed cell death.

Key words: Apoptosis, Bcl-2, chloroplast, herbicide


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