Effect of sugar-induced senescence on gene expression and implications for the regulation of senescence in Arabidopsis.

Planta
Nathalie PourtauAstrid Wingler

Abstract

There has been some debate whether leaf senescence is induced by sugar starvation or by sugar accumulation. External supply of sugars has been shown to induce symptoms of senescence such as leaf yellowing. However, it was so far not clear if sugars have a signalling function during developmental senescence. Glucose and fructose accumulate strongly during senescence in Arabidopsis thaliana (L.) Heynh. leaves. Using Affymetrix GeneChip analysis we determined the effect of sugar-induced senescence on gene expression. Growth on glucose in combination with low nitrogen supply induced leaf yellowing and changes in gene expression that are characteristic of developmental senescence. Most importantly, the senescence-specific gene SAG12, which was previously thought to be sugar-repressible, was induced over 900-fold by glucose. Induction of SAG12, which is expressed during late senescence, demonstrates that processes characteristic for late stages are sugar-inducible. Two MYB transcription factor genes, PAP1 and PAP2, were identified as senescence-associated genes that are induced by glucose. Moreover, growth on glucose induced genes for nitrogen remobilisation that are typically enhanced during developmental senescence, including the g...Continue Reading

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Citations

May 3, 2011·Plant Molecular Biology·Qing-Jun LuoChristopher D Rock
Sep 29, 2011·Analytical Chemistry·Ali YilmazJerzy W Jaroszewski
Mar 12, 2009·Journal of Experimental Botany·Astrid WinglerAndreas M Fischer
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