Phosphate Levels: The Hidden Gatekeepers of the Rice-Blast Pathosystem.

Rice (Oryza sativa L.), the staple food for more than half of the world's population, depends on a balanced phosphate supply to sustain its growth, development, and defense mechanisms. While phosphate is fundamental to plant metabolism, its specific role in the Rice-blast pathosystem remains an emerging area of research. Recent studies reveal that excess phosphate enhances disease severity, whereas phosphate deficiency restricts fungal entry, highlighting phosphate homeostasis as a hidden determinant of blast susceptibility. Paradoxically, the pathogen Magnaporthe oryzae can activate the phosphate starvation response (PSR) in rice, even under phosphate-sufficient conditions. This Mini Review integrates these seemingly conflicting findings into a unified framework linking phosphate signaling with pathogen-induced PSR. We further discuss how the M. oryzae Nudix effector (MoNUDIX) disrupts host phosphate signaling and propose that strengthening arbuscular mycorrhizal symbiosis, alongside optimized fertilization, could restore phosphate balance and enhance resistance to blast disease in rice plants.

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