Abstract
Understanding gene regulation mechanisms is important for genetic improvement of abiotic stress resistance of crops. In response to developmental and environmental cues, plants employ a plethora of gene regulation mechanisms, one of which is posttranscriptional regulation of gene expression by non-protein coding small RNAs. Samll RNAs, namely, microRNAs (miRNAs) and short interfering RNAs (siRNAs), are ∼20 to 24-nucleotide single stranded RNAs. miRNAs are synthesized from MIR gene transcripts, while siRNAs are synthesized from dsRNA formed by transcripts of heterochromatin DNA repeats, mRNAs encoded by natural cis-antisense gene pairs and miRNA directed cleavage of ssRNA/mRNA. Small RNAs regulate the expression of complementary/partially complementary genes by directing mRNA cleavage, translational repression, chromatin remodeling and DNA methylation. Several stress responsive small RNAs have been identified in plants and their role in oxidative stress tolerance, osmolyte accumulation/osmoprotection and nutrient starvation response have been established. Under abiotic stresses, stress-upregulated miRNAs may down-regulate their target genes, which are likely negative regulators of stress tolerance, while stress down regulated miRNAs may result in accumulation of their target gene mRNAs, which may positively regulate stress tolerance. Overexpression of miRNA-resistant target genes will help overcome post-transcriptional gene silencing, and thus may lead to better expression of engineered trait in transgenic plants. Understanding the roles of small RNAs in transcriptome homeostasis, cellular tolerance, phenological and developmental plasticity of plants under abiotic stress and recovery will help genetic engineering of abiotic stress resistance in crop plants
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Chinnusamy, V., Zhu, J., Zhou, T., Zhu, JK. (2007). Small Rnas: Big Role In Abiotic Stress Tolerance Of Plants. In: Jenks, M.A., Hasegawa, P.M., Jain, S.M. (eds) Advances in Molecular Breeding Toward Drought and Salt Tolerant Crops. Springer, Dordrecht. https://doi.org/10.1007/978-1-4020-5578-2_10
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