Abstract
Abiotic stresses significantly reduce the grain yield and productivity of cereal crops, especially rice, and this may affect food security in the future. Different abiotic stress adaptation pathways have been investigated and depicted in plants. Among these, the ubiquitin-proteasome system (UPS) has been studied as a key mechanism to understand the protein regulation pathways that enhance the adaptation and survival of plants under various environmental stresses such as drought, salinity, cold, and toxic metalloid exposure. RING E3 ligases constitute a highly diverse and important enzyme group that acts within the 26S UPS, and it also plays a crucial role as a central regulator of plant physiological and cellular processes. This review aimed to highlight recent findings and discoveries regarding the different stress-induced RING E3 ligase genes of major cereal crops and their functions via ubiquitination pathways under different environmental stress conditions. Such genes regulate different physiological responses including protein stabilization, cell membrane integrity, regulation of stomatal opening, and the maintenance of meristematic cells, and they also regulate reactive oxygen species and heavy metal levels via ubiquitination in plants. Hence, the ubiquitination process is considered a potential target for the development of abiotic stress-tolerant crops, and it might be used as an excellent mechanism for stress-tolerant crop improvement programs.
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Chapagain, S., Park, Y.C. & Jang, C.S. Functional diversity of RING E3 ligases of major cereal crops in response to abiotic stresses. J. Crop Sci. Biotechnol. 20, 351–357 (2017). https://doi.org/10.1007/s12892-017-0104-0
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DOI: https://doi.org/10.1007/s12892-017-0104-0