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RISS 인기검색어
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- 저자 : Tabrett, Alex (검색결과 1 건)
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Lim, Pyung Ok,Kim, Yumi,Breeze, Emily,Koo, Ja Choon,Woo, Hye Ryun,Ryu, Jong Sang,Park, Don Ha,Beynon, Jim,Tabrett, Alex,Buchanan-Wollaston, Vicky,Nam, Hong Gil Blackwell Publishing Ltd 2007 The Plant journal Vol.52 No.6
<P>Summary</P><P>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 (<I>ore7-1D</I>) 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 (<I>ORE7</I>/<I>ESC</I>) 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 <I>ORE7</I>/<I>ESC</I> results in a younger condition in the mutant leaves. We propose that ectopically expressed <I>ORE7</I>/<I>ESC</I> is negatively regulating leaf senescence and suggest that the resulting chromatin alteration may have a role in controlling leaf longevity. Interestingly, activation of <I>ORE7</I>/<I>ESC</I> also led to a highly extended post-harvest storage life.</P>
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