By Dariusz Latowski, Ewa Surówka (auth.), Naser A. Anjum, Ming-Tsair Chan, Shahid Umar (eds.)
Plants are sessile organisms that dwell less than a relentless barrage of biotic and abiotic insults. either biotic and abiotic rigidity elements were proven to impact numerous points of plant approach together with the acceleration within the formation of reactive oxygen species (ROS). The ascorbate (AsA)-glutathione (GSH) pathway is a key a part of the community of reactions concerning enzymes and metabolites with redox houses for the detoxing of ROS, and therefore to evade the ROS-accrued oxidative harm in vegetation. the current publication normally bargains with the data received in the course of the cross-talks and inter-relationship reviews at the physiological, biochemical and molecular points of the cumulative reaction of varied parts of AsA-GSH pathway to emphasize elements and their importance in plant rigidity tolerance.
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Extra resources for Ascorbate-Glutathione Pathway and Stress Tolerance in Plants
Dietz (2003) grouped redox signals on three types based on their origin and mode of action in signal transmission. Type-I signals derive specifically from single pathways, type-II signals integrate redox information from various pathways and type-III redox signals indicate more extreme redox imbalances and their transmission depends on cross-talk with other signaling cascades. Similarly, Pfannschmidt et al. (2001, 2003) defined three classes of redox signals based on perturbation of the photosynthetic electron transfer depending on the light intensity.
2003). These effects point to opposing functions for GSH and Asc in redox signal transduction. A striking relationship between glutathione oxidation and mitochondrial DNA damage during aging has also been reported (Yen et al. 1994; Esteve et al. 1999). In addition, accumulation of GSSG is often associated with tissue death or quiescence (Wachter et al. 2005). Kranner et al. (2006) demonstrated that the alteration in the half-cell reduction potential of the GSH/GSSG couple (EGSSG/2GSH), a major cellular antioxidant and redox buffer is part of the 1 Regulatory Role of Components of Ascorbate–Glutathione Pathway 33 signaling cascade that initiates programmed cell death (PCD), finally causing internucleosomal DNA fragmentation in the final, or execution phase, of PCD (Kranner et al.
2003; Nunes-Nesi et al. 2005), what is coupled to a general up-regulation of levels of transcripts encoding genes associated with photosynthesis (Urbanczyk-Wochniak et al. 2006). Sweetlove et al. (2007) suggest that redox signals emanating from the mitochondria are important in setting the cellular machinery to maintain the overall redox balance, and experiments on transgenic/mutant plants hint at important role for ascorbate in the co-ordination of major pathways of energy metabolism in the leaf (Nunes-Nesi et al.