ABA Receptors: Prospects for Enhancing Biotic and Abiotic Stress Tolerance of Crops

摘要: The plant stress hormone abscisic acid (ABA) regulates myriad of developmental programs such as germination, root development, vegetative growth, seed dormancy, and desiccation tolerance. ABA, the master controller transpiration, ion channels gene expression that are necessary for abiotic tolerance plants hence popularly called hormone. In past one decade, role ABA in regulation biotic is emerging. response to low leaf water status well pathogen-associated molecular pattern (PAMP) signaling, induces closure stomata, which major gateways pathogens entry into cells. Salicylic (SA) promotes systemic acquired resistance (SAR) biotrophic lifestyle, while jasmonic (JA) ethylene positively regulate induced (ISR) against necrotrophic insects. addition its PAMP-mediated stomatal closure, interacts synergistically or antagonistically with SA, JA, disease pathway. Intense efforts made since 1980s have unraveled details culminating breakthrough discovery START domain proteins PYR/PYL/RCAR receptors (ABAR) identification core components signaling 2009. Recent studies also revealed critical processes fruit ripening secondary metabolite accumulation. Genetic manipulation envisaged a potential tool enhancing development crops. This chapter focuses on structural basis signaling. Further, it explores genetic engineering components, protein develop orthogonal receptor, novel synthetic agonists ABARs improving crop yield, quality,