Metabolic regulation of leaf senescence: interactions of sugar signalling with biotic and abiotic stress responses

Plant Biology
Astrid Wingler, Thomas Roitsch

Abstract

Sugars are important signals in the regulation of plant metabolism and development. During stress and in senescing leaves, sugars often accumulate. In addition, both sugar accumulation and stress can induce leaf senescence. Infection by bacterial and fungal pathogens and attack by herbivores and gall-forming insects may influence leaf senescence via modulation of the sugar status, either by directly affecting primary carbon metabolism or by regulating steady state levels of plant hormones. Many types of biotic interactions involve the induction of extracellular invertase as the key enzyme of an apoplasmic phloem unloading pathway, resulting in a source-sink transition and an increased hexose/sucrose ratio. Induction of the levels of the phytohormones ethylene and jasmonate in biotic interactions results in accelerated senescence, whereas an increase in plant- or pathogen-derived cytokinins delays senescence and results in the formation of green islands within senescing leaves. Interactions between sugar and hormone signalling also play a role in response to abiotic stress. For example, interactions between sugar and abscisic acid (ABA) signalling may be responsible for the induction of senescence during drought stress. Cold tre...Continue Reading

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Citations

Jan 15, 2013·Plant Molecular Biology·Klaus Humbeck
Mar 12, 2009·Journal of Experimental Botany·Astrid WinglerAndreas M Fischer
Jan 24, 2012·Journal of Experimental Botany·Sébastien BesseauE Tapio Palva
Oct 1, 2013·Journal of Experimental Botany·Maria V YamburenkoThomas Börner
Dec 3, 2013·Journal of Experimental Botany·David GranotRakefet David-Schwartz
Jul 4, 2012·Molecular Plant-microbe Interactions : MPMI·Michael BehrStefan G R Wirsel
Oct 6, 2010·Plant Physiology·Jen Sheen
Jun 27, 2012·Plant Physiology·Rajandeep S SekhonShawn M Kaeppler
May 22, 2013·Plant Physiology·Michael E StokesMalcolm M Campbell
Mar 1, 2014·Plant Science : an International Journal of Experimental Plant Biology·Mingxun ChenLixi Jiang
Dec 27, 2015·Plant Science : an International Journal of Experimental Plant Biology·Amandeep MittalChristopher D Rock
Mar 13, 2012·Plant Science : an International Journal of Experimental Plant Biology·Ligang Ren, Guiliang Tang
Apr 24, 2010·Journal of Plant Physiology·Marianela RodríguezRamiro Lascano
May 8, 2010·Journal of Plant Physiology·Krzysztof LeśniewiczElzbieta Poreba
May 18, 2010·Plant Physiology and Biochemistry : PPB·Jitka ProkopováAles Lebeda
Dec 2, 2015·Nature Genetics·Frank F White, Wolf Frommer
Aug 15, 2015·Journal of Experimental Botany·Jing WangCordelia Bolle
Sep 20, 2008·Plant Biology·K Krupinska, K Humbeck

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