Aminoethoxyvinylglycine: isolated and combined with other growth regulators on quality of ‘Brookfield’ apples after storage

Growth regulators are used in the production of apples worldwide, especially to extend the harvest period and maintain postharvest quality. This study aimed to investigate the effects of applying aminoethoxyvinylglycine (AVG) in isolation as well as in combination with other growth regulators and postharvest techniques on the harvest quality and storage potential of ‘Brookfield’ apples (Malus domestica), a ‘Gala’ strain. Fruit receiving AVG only had the highest starch content and the highest titratable acidity at harvest. After 8 months of storage, the AVG + 1-MCP (1-methylcyclopropene) and AVG + ABS (ethylene absorption) conserved higher flesh firmness than to all the other treatments. Naphthaleneacetic acid (NAA) application induced ACC oxidase enzyme activity at harvest, but not after storage. AVG application, with or without the aid of another technique, did not decrease the red skin color of ‘Brookfield’ apples. Low mealiness and a high healthy fruit percentage was obtained when the fruits were submitted to pre-harvest AVG application combined with NAA, 1-MCP and ABS. Internal carbon dioxide had an inverse correlation with the quantity of healthy fruit and was directly correlated with mealiness.

目前全球苹果生产中广泛使用植物生长调节剂，主要用于延长采收期并维持采后品质。本研究旨在探究单独施用氨基乙氧基乙烯基甘氨酸（aminoethoxyvinylglycine, AVG），或将其与其他植物生长调节剂、采后处理技术联用时，对‘布鲁克菲尔德’苹果（Malus domestica，‘Gala’品系）的采收品质与贮藏潜力的影响。仅施加AVG的果实，采收时的淀粉含量与可滴定酸度均为最高。经过8个月贮藏后，AVG与1-甲基环丙烯（1-methylcyclopropene, 1-MCP）联用、AVG与乙烯吸收剂（ethylene absorption, ABS）联用的处理组，果肉硬度保留效果优于其余所有处理。萘乙酸（naphthaleneacetic acid, NAA）的施用可在采收时诱导ACC氧化酶活性，但该效应在贮藏后未显现。无论是否辅以其他处理技术，施用AVG均未降低‘布鲁克菲尔德’苹果的果皮红色占比。当采前施用AVG并联合NAA、1-MCP与ABS处理时，果实的粉质化程度更低，健康果占比更高。果实内部二氧化碳浓度与健康果数量呈负相关，与粉质化程度呈正相关。