MG is both a mutagen and a genotoxic agent. At high cellular concentration, itinhibits cell proliferation (Ray et al., 1994) and results in a number of adverseeffects such as increasing the degradation of proteins through the formation ofadvanced glycation end products (AGEs) and inactivating the antioxidant defencesystem (Wu and Juurlink, 2002; Hoque et al., 2010). Additionally, MG causesincreased sister chromatic exchange and endoreduplication and also inducesDNA strand breaks and increases point mutations (Chaplen, 1998). Therefore,efficient detoxification of MG overproduced during various abiotic or bioticstresses is one of the most important adaptive strategies of plant stress tolerance.Genes expressed during NaCl and high MG stress are anticipated to promotecellular tolerance through protective functions in the cytoplasm, alteration ofcellular water potential to promote water uptake, control of ion accumulation andfurther regulation of gene expression.
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