*Article not assigned to an issue yet
Yadav Rekha, Sharma Manish, Sharma Yogita, Singh Chandra Pal
Keywords: Soybean, Abiotic stress, Drought, MicroRNAs, Crop improvement
Soybean is an important cash crop and a good source of vegetable oil and protein. It is rich in proteins with essential amino acids and is therefore known as poor man’s meat. Multiple natural and packaged food products prepared from soybeans are consumed worldwide, which has increased soybean global demand. The changing climatic and environmental conditions cause severe abiotic stress, which can significantly hamper soybean production. Drought is one of the predominant abiotic stress factors, which affects growth, development, and eventually crop yield. Soybean grows in tropical regions and is tolerant to water stress. To understand the molecular mechanism underlying drought tolerance in soybeans, several studies have been carried out to analyze the function of different genes and miRNAs expressed under drought conditions. The miRNAs are endogenously encoded non-coding RNAs with ∼22 nt in length, found in higher eukaryotes. These small RNAs bind to corresponding target mRNAs and regulate their gene expression. The development of drought-tolerant soybean varieties using miRNA as a genetic engineering tool has thus been applied to meet the rising demands of soybean and other derived products. Herein, we provide an overview of the miRNAs, which have been reported in soybeans under drought conditions. Additionally, the biogenesis and mechanism of action of miRNA have also been discussed. Further, an attempted review would help to understand the role of miRNAs in soyabean drought tolerance and would provide vital information to devise novel strategies for developing drought-tolerant varieties of soybean.
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Department of Botany, University of Rajasthan, Jaipur, India