Yi Zheng , Jing Yu , Hongyi Wen , Yazhen Chen , Mengshi Lin , Yuzhao Lin , Yueying Sang , Shucheng Li , Yihui Chen , Yifen Lin , Hetong Lin
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引用次数: 0
Abstract
Pulp breakdown is one of the primary symptoms of quality deterioration in postharvest longan fruit. As a pivotal pathogen, Phomopsis longanae Chi (P. longanae) leads to the spoilage of fresh longan. This work aimed to elucidate the influences of P. longanae infection on the metabolisms of energy and respiration in relation to longan pulp breakdown. Longan fruit were infected for 5 min with P. longanae at 104 spores mL−1, while the fruit dipped in distilled water were served as the control. These longans were stored for five days under the conditions of 28 °C and 90 % relative humidity. The results showed that, compared with the control longans, P. longanae-infected longans displayed a higher index of pulp breakdown, lower levels of ATP, ADP and EC, and lower activities of H+, Ca2+ and Mg2+-ATPase in the membranes of mitochondria, plasma and vacuoles. Besides, P. longanae-infected longans presented a higher respiration rate, higher activities of PGI, SDH, CCO, AAO, PPO and AOX, and higher levels of NAD and NADH, while showing lower activities of G-6-PDH + 6-PGDH and NADK, and lower levels of NADP and NADPH. These findings suggest that P. longanae infection aggravated the development of pulp breakdown in fresh longan, which was related to the reduced energy status and the enhanced respiratory metabolism.
期刊介绍:
The journal is devoted exclusively to the publication of original papers, review articles and frontiers articles on biological and technological postharvest research. This includes the areas of postharvest storage, treatments and underpinning mechanisms, quality evaluation, packaging, handling and distribution of fresh horticultural crops including fruit, vegetables, flowers and nuts, but excluding grains, seeds and forages.
Papers reporting novel insights from fundamental and interdisciplinary research will be particularly encouraged. These disciplines include systems biology, bioinformatics, entomology, plant physiology, plant pathology, (bio)chemistry, engineering, modelling, and technologies for nondestructive testing.
Manuscripts on fresh food crops that will be further processed after postharvest storage, or on food processes beyond refrigeration, packaging and minimal processing will not be considered.