By A. Shanker, et al.,
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Additional info for Abiotic Stress Response in Plants - Phys., Biochem, Genetic Persps
Essentially all abiotic stresses lead to the production of reactive oxygen species (ROS) albeit different forms and in different subcellular compartments (Jaspers & Kangasjärvi, 2010). , 2007). , 2008; Munns & Tester, 2008; Vaahtera & Brosché, 2011; Zhu, 2002). Despite the wealth of information on abiotic stress defence in plants the mechanisms of stress sensing have remained relatively elusive. In this review we turn our attention to the mechanisms of abiotic stress perception. Generally, stresses, as well as other stimuli, can be perceived in a direct or an indirect manner.
2006). While the evidence supports a role for histidine kinases as sensors for salt and osmotic stress, the mechanism of this stress perception is still unclear. Much information originates from gene expression analysis of stress responses and from phenotypic analysis of mutant plants; direct biochemical evidence for salt or osmotic stress sensing is however lacking. , 2009). , 1981). , 2008). It is abundantly clear, that histidine kinases have important roles during the regulation of salt and osmotic stress responses in addition to their roles in hormone signalling and they are probably very early elements in the perception machinery.
The mechanisms of acclimation include reversible phosphorylation and migration of a part of the light-harvesting antenna complexes between photosystems to balance the energy distribution (so-called state transitions). The process is controlled by the redox status of the plastoquinone pool (PQ). , 2003). , 2005). , 2010; Pfannschmidt, 2010). , 2010). Thus, the pair STN7/TAP38(PPH1) is a key regulator of state transitions and shortterm acclimation in Arabidopsis. , 2008). The photosynthetic reactions in chloroplasts are a continuous source of ROS: several different ROS are produced inside plastids as by-products of photosynthesis.
Abiotic Stress Response in Plants - Phys., Biochem, Genetic Persps by A. Shanker, et al.,