Lim, Pyung Ok, Kim, Yumi, Breeze, Emily, Koo, Ja Choon, Woo, Hye Ryun, Ryu, Jong Sang, Park, Don Ha, Beynon, Jim, 1956-, Tabrett, Alex, Buchanan-Wollaston, Vicky and Nam, Hong Gil. (2007) Overexpression of a chromatin architecture-controlling AT-hook protein extends leaf longevity and increases the post-harvest storage life of plants. PLANT JOURNAL, 52 (6). pp. 1140-1153. ISSN 0960-7412

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Abstract

Leaf senescence is the final stage of leaf development and is finely regulated via a complex genetic regulatory network incorporating both developmental and environmental factors. In an effort to identify negative regulators of leaf senescence, we screened activation-tagged Arabidopsis lines for mutants that exhibit a delayed leaf senescence phenotype. One of the mutants (ore7-1D) showed a highly significant delay of leaf senescence in the heterozygous state, leading to at least a twofold increase in leaf longevity. The activated gene (ORE7/ESC) encoded a protein with an AT-hook DNA-binding motif; such proteins are known to co-regulate transcription of genes through modification of chromatin architecture. We showed that ORE7/ESC, in addition to binding to a plant AT-rich DNA fragment, could also modify the chromatin architecture, as illustrated by an altered distribution of a histone-GFP fusion protein in the nucleus of the mutant. Globally altered gene expression, shown by microarray analysis, also indicated that activation of ORE7/ESC results in a younger condition in the mutant leaves. We propose that ectopically expressed ORE7/ESC is negatively regulating leaf senescence and suggest that the resulting chromatin alteration may have a role in controlling leaf longevity. Interestingly, activation of ORE7/ESC also led to a highly extended post-harvest storage life.

Item Type:	Journal Article
Subjects:	S Agriculture > SB Plant culture
Journal or Publication Title:	PLANT JOURNAL
Publisher:	BLACKWELL PUBLISHING
ISSN:	0960-7412
Official Date:	December 2007
Volume:	52
Number:	6
Number of Pages:	14
Page Range:	pp. 1140-1153
Identification Number:	10.1111/j.1365-313X.2007.03317.x
Publication Status:	Published
URI:	http://wrap.warwick.ac.uk/id/eprint/30870

Data sourced from Thomson Reuters' Web of Knowledge

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