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NAD synthesis and catabolic pathways involved in rice leaf senescence. Asp: aspartate, QA: quinolinic acid, Na: nicotinic acid, Nam: nicotinamide, PRPP: 5-phosphoribosyl-1-pyrophosphate, NaMN: nicotinate mononucleotide, NAAD: nicotinic acid adenine dinucleotide, NAD: nicotinamide adenine dinucleotide.
