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

By A. Shanker, et al.,

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These proteins however rely on intracellular ROS for redox regulation. The perception of apoplastic ROS is so far not well understood. Extracellular ROS might be perceived in different ways. , 2006; Jaspers & Kangasjärvi, 2010). In particular cysteine-rich proteins have been proposed as candidates for ROS perception in the apoplast (Reddie & Carroll, 2008). Candidates include receptor-like kinases (RLKs) and small apoplastic proteins and peptides. , 1999). , 2010). , 2004). , 2009b). A peptide derived from GRI can induce cell death in plants in the presence of superoxide.

Another Zn2+/H+ antiporter, METAL TOLERANCE PROTEIN 1 (AtMTP1), localizes to the vacuolar membrane and is involved in Zn2+ homeostasis. It drives Zn2+ detoxification and accumulation in the leaves. , 2008). It is clear that metal transporters perform the task of metal sensing to regulate import or export of metal ions. How that subsequently translates into a downstream response as reflected in transcriptional adaptation however, is still unclear. Detoxification of HMs occurs in the cytosol where high affinity targets of HM, so called chelators, bind and sequester HM in order to detoxify the cell.

2009). LONG HYPOCOTYLS 5 (HY5) is a bHLH transcription factor, acting downstream of light signalling cascades induced by activation of photoreceptors. , 2007a). Activity of HY5 is mediated by protein phosphorylation and degradation, where COP1 plays an important role. , 2007). , 2007). Belonging to another class of blue light photoreceptors, PHOT1 and PHOT2 have a minor role in blue light dependent photomorphogenesis compared to CRYs. However, PHOT1 and PHOT2 play a key role in blue light-dependent chloroplast movement, which serves as a rapid response to different light regimes (Celaya & Liscum, 2005; Demarsy & Fankhauser, 2009).

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