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Gene regulation; genetic manipulation; grain yield; microRNAs; plant architecture; rice

Ensuring agricultural food security is a major concern for the future world, and being the second mostconsumed crop, rice yield needs an urgent upliftment. Grain yield is a pleiotropic trait that employs a plethoraof genes functioning in complex signalling cascades. The yield related genes are controlled by variousregulatory factors including the microRNAs (miRNAs), the small 20–22 nucleotide (nt) non-coding RNAs,which have emerged as the master ribo-regulators of eukaryotic genes. Plant miRNAs can bind to highlycomplementary sequences in the target messenger RNAs (mRNAs) and negatively regulate gene expression tocoordinate the various biological processes involved in plant development. In rice, an ideal plant architecture(IPA) has been regarded as the key to attain high yield and several miRNAs have been deciphered to playimportant roles in orchestrating vital regulatory procedures for achieving optimum plant morphological yieldrelated traits like less unproductive tillers, more panicle branches and heavier grains. In this review, we presentand discuss the various genetic engineering strategies undertaken to manipulate the miRNA-mRNA expressionlevels in order to achieve improved grain output by modulation of rice plant architecture and recent advancesmade in this regard.

RANJEET KAUR¹ RUPAM KUMAR BHUNIA² MANCHIKATLA VENKAT RAJAM¹

1. Department of Genetics, University of Delhi South Campus, Benito Juarez Road, New Delhi 110 026, India
2. Plant Tissue Culture and Genetic Engineering, National Agri-Food Biotechnology Institute (NABI), Mohali, Punjab 140 306, India

Published

21 September 2020