Abstract
Phytocystatins are a type of proteinase inhibitor which are extensively studied for their specific inhibitory action against cysteine protease enzymes (CP) of insects and pathogens. Oryzacystatins (OC), a phytocystatin from rice inhibits CP in a reversible manner with its conserved tripartite wedge. OCs have important role in plant innate defense mechanism through phytohormonal signalling pathways. OC are induced in response to both biotic and abiotic stress conditions and are used to develop transgenic plants exhibiting resistance against stress conditions. In this review, we focus on the structure and mechanism of action of oryzacystatins, their possible role in plant physiology, biotic and abiotic stress tolerance mechanism in plants and their potential application strategies for future crop management studies.
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