Abiotic Stress Response in Plants - Phys., Biochem, Genetic by A. Shanker, et al.,

By A. Shanker, et al.,

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2011). In the cyanobacterium Synechocystis sp. PCC6803 the key enzyme of the glucosyl-glycerol pathway (GgpS) can be non-competitively inhibited by nucleic acids in a sequence- and length-independent manner via a saltdependent electrostatic interaction. The intracellular salt concentration thus could serve as a trigger for GgpS regulation leading to inactivation through nucleic acid binding at low salt concentrations. An increase in salt concentration leads to liberation of GgpS and the accumulation of glucosyl-glycerol facilitates the acclimatization to salt stress.

This results in differential regulation of gene expression that will affect pathways including the induction of the ROS scavenging system and repression of the ROS-producing mechanisms. Ultimately this sensing, signalling and transcriptional reprogramming will be critical for the future fate of the cell leading to adaptation to the stress or to cell death. 2. Perception of salt and osmotic stresses Salt stress is an abiotic stress, for which some perception components have been identified. , Na toxicity (Munns & Tester, 2008).

Current Opinion in Immunology 13: 63-68 Ton J, Mauch-Mani B (2004) β-amino-butyric acid-induced resistance against necrotrophic pathogens is based on ABA-dependent priming for callose. The Plant Journal 38: 119-130 Torres MA, Dangl JL (2005) Functions of the respiratory burst oxidase in biotic interactions, abiotic stress and development. Curr Opin Plant Biol 8: 397-403 Torres MA, Jones JD, Dangl JL (2006) Reactive oxygen species signaling in response to pathogens. Plant Physiol 141: 373-378 Tsutsui T, Kato W, Asada Y, Sako K, Sato T, Sonoda Y, Kidokoro S, Yamaguchi-Shinozaki K, Tamaoki M, Arakawa K, Ichikawa T, Nakazawa M, Seki M, Shinozaki K, Matsui M, Ikeda A, Yamaguchi J (2009) DEAR1, a transcriptional repressor of DREB protein that mediates plant defense and freezing stress responses in Arabidopsis.

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