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首页> 外文期刊>Acta Horticulturae >Systemic resistance inducers applied preharvest for Colletotrichum gloeosporioides control in avocados.
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Systemic resistance inducers applied preharvest for Colletotrichum gloeosporioides control in avocados.

机译：全身抗性诱导剂在收获前用于鳄梨中炭疽菌的防治。

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摘要

World avocado production has consistently increased over the past decade. Long shipping periods are common to consistently provide distant markets with fruit, necessitating extended cold storage which often results in poor fruit quality and early softening. This may enhance postharvest disease incidence. Anthracnose (Colletotrichum gloeosporioides) as a latent infection may cause considerable losses. Antifungal compounds in the fruit decline during fruit ripening. The objective of this study was to use systemic resistance inducers to enhance the concentration of antifungal compounds and thus decrease postharvest diseases, reducing the need for other chemical control measures such as copper sprays. Preharvest sprays of phosphorous acid (500 mg L-1 a.i.) were applied to fruit trees, and fruit harvested on the day of spraying as well as 7, 14, and 21 days thereafter. Fruit were either ripened immediately at ambient temperature or stored for 28 days at either 5.5 or 2 degrees C before ripening. The general fruit appearance was evaluated during ripening and exocarp samples analysed for potential antifungal compounds and phenylalanine ammonia-lyase (PAL) activity. Preharvest phosphorous acid application decreased anthracnose development with optimum results obtained when fruit were harvested 14 days after phosphorous acid application for both PAL and phenolic activity.
机译：在过去的十年中，世界鳄梨的产量一直在增长。通常需要较长的运输时间才能始终为遥远的市场提供水果，因此需要延长冷藏时间，这通常会导致水果质量差和早软化。这可能会增加收获后疾病的发病率。炭疽病（Colletotrichum gloeosporioides）作为潜在感染可能会造成相当大的损失。果实中的抗真菌化合物在果实成熟期间会下降。这项研究的目的是使用系统性抗药性诱导剂来提高抗真菌化合物的浓度，从而减少收获后疾病，从而减少对其他化学控制措施（如铜喷雾剂）的需求。在果树上收获前喷洒亚磷酸（500 mg L -1 a.i.），并在喷洒当天以及之后的7、14和21天收获果实。果实在环境温度下立即成熟，或者在成熟前在5.5或2摄氏度下保存28天。在成熟期间评估果实的总体外观，并分析外果皮样品中潜在的抗真菌化合物和苯丙氨酸氨裂合酶（PAL）的活性。收获前亚磷酸的施用减少了炭疽病的发生，当施用亚磷酸14天后收获果实时，其炭黑和PAL活性均获得最佳结果。

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