By A. Shanker, et al.,

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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. -) is converted to hydrogen peroxide (H2O2) by a chloroplast-associated superoxide dismutase (SOD). Singlet oxygen (1O2) is produced at PSII by energy transfer from excited chlorophyll molecules to oxygen.

Excess of iron is harmful for cells due to its high reactivity with oxygen which leads to ROS production. , 2001). , 2010). , 2009). Detailed gene expression analyses have allowed the identification of HM stress-specific transcriptional profiles and suggested the existence of HM sensors. Transcriptional analysis of plant responses to different HMs suggested the presence of a Zn2+ sensor in the cell. Interestingly, this Zn2+ sensor might have an important role in response to Cd2+ through competitive binding of Cd2+ or Zn2+.

It has become clear that ROS are not only toxic to cells but serve important functions as signalling molecules. However, we do not currently have a clear understanding of how ROS signalling works and how ROS signals are perceived. The regulation of ROS production occurs in different subcellular locations including the chloroplasts, peroxisomes, mitochondria and in the apoplast. Important components of the apoplastic oxidative burst are the NADPH oxidases respiratory burst oxidase homologues (AtRBOH).

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

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