Phomopsis longanae Chi infection induces changes in the metabolisms of energy and respiration in relation to longan pulp breakdown

IF 6.4 1区 农林科学 Q1 AGRONOMY Postharvest Biology and Technology Pub Date : 2024-09-17 DOI:10.1016/j.postharvbio.2024.113199
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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.

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Phomopsis longanae Chi感染引起的能量和呼吸代谢变化与龙眼果肉分解的关系
果肉腐烂是采后龙眼果实质量下降的主要症状之一。作为一种重要的病原菌,龙眼拟鳞霉菌(Phomopsis longanae Chi,P. longanae)会导致新鲜龙眼变质。本研究旨在阐明龙眼疫霉菌感染对龙眼果肉分解过程中能量代谢和呼吸作用的影响。以 104 个孢子 mL-1 的龙眼孢子感染龙眼果实 5 分钟,而浸泡在蒸馏水中的果实作为对照。这些龙眼在 28 °C 和 90% 相对湿度的条件下贮藏 5 天。结果表明,与对照龙眼相比,感染了龙眼孢子的龙眼果肉分解指数较高,ATP、ADP和EC水平较低,线粒体、浆和液泡膜中的H+、Ca2+和Mg2+-ATP酶活性较低。此外,受龙眼菌感染的龙眼呼吸速率较高,PGI、SDH、CCO、AAO、PPO 和 AOX 活性较高,NAD 和 NADH 水平较高,而 G-6-PDH + 6-PGDH 和 NADK 活性较低,NADP 和 NADPH 水平较低。这些研究结果表明,龙眼疫霉菌感染加剧了新鲜龙眼果肉分解的发展,这与能量状态降低和呼吸代谢增强有关。
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来源期刊
Postharvest Biology and Technology
Postharvest Biology and Technology 农林科学-农艺学
CiteScore
12.00
自引率
11.40%
发文量
309
审稿时长
38 days
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.
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