Regulation of 2,4-dinitrophenol and Adenosine Triphosphate on Disease Development, Energy Status, and Respiratory Metabolism of Phomopsis longanae Chi-infected Longan Fruit
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Abstract:
The DNP treatment increased the contents of nicotinamide adenine dinucleotide (NAD) and reduced NAD (NADH), decreased NAD kinase (NADK) activity in the pericarp, and led to lower contents of NAD phosphate (NADP) and reduced NADP (NADPH) and a lower level of energy charge. By contrast, ATP treatment reduced the disease index and pericarp-browning index for P. longanae-inoculated longans, and decreased the respiration rate of the fruit as well as the activities of COX, AAO, and PPO in the pericarp. Additionally, ATP treatment reduced the contents of NAD and NADH, increased NADK activity in the pericarp, and led to higher contents of NADP and NADPH and a higher level of energy charge. These results suggest that DNP treatment accelerates the development of postharvest disease in P. longanae- infected longans through exacerbating energy deficiency, decreasing pentose phosphate pathway activity in respiration and metabolism, and increasing the activities of respiratory terminal oxidases such as COX, AAO, and PPO. On the other hand, ATP treatment likely delayed the development of postharvest disease in P. longanae-infected longans through maintaining a relatively high level of energy charge, increasing PPP activity in respiration and metabolism, and decreasing the activities of respiratory terminal oxidases such as COX, AAO, and PPO.
