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Semi-commercial testing of native yeasts selected from north patagonia argentina for the biocontrol of pear postharvest decays
Biological Control ( IF 3.7 ) Pub Date : 2020-11-01 , DOI: 10.1016/j.biocontrol.2020.104246
María Cecilia Lutz , Christian Ariel Lopes , María Cristina Sosa , Marcela Paula Sangorrín

Abstract The efficacy of two regional yeasts, Pichia membranifaciens NPCC 1250 and Vishniacozyma victoriae NPCC 1263, for controlling pear postharvest decay was evaluated at large scale (semi-commercial conditions) in two different packing houses. The human safety of the two yeast strains was initially assayed by assessing growth at body temperature, pseudohyphal growth, phospholipases production, and growth in simulated gastric juice. Subsequently, yeasts biomass was produced in a bioreactor (22 L) containing 18 L of culture medium based on sugarcane molasses plus urea. The produced biomass, with/without CaCl2 (2% w/v) addition, was used in biocontrol experiments carried out at semi-commercial scale on Beurre d'Anjou and Packham’s Triumph pears. Vishniacozyma victoriae NPCC 1263 plus CaCl2 showed high performance on controlling decay caused by Penicillium expansum and Botrytis cinerea. On Beurre d'Anjou cv, P. expansum and B. cinerea incidence was reduced by 70% and 100%, respectively, after 90 days of commercial storage. On Packham’s Triumph the incidence of the two decay forms was 63% after 150 days. The two antagonistic yeasts were able to establish and colonize the surface of the fruits, with an estimated increase in the population density of approximately three orders of magnitude during the postharvest period. This work is the first to evaluate and demonstrate the efficacy of local biocontrol experiments with regional yeasts under semi-commercial conditions.

中文翻译:

来自阿根廷北巴塔哥尼亚的天然酵母用于梨采后腐烂生物防治的半商业试验

摘要 在两个不同的包装厂大规模(半商业条件)评估了两种区域酵母,膜毕赤酵母 NPCC 1250 和维多利亚维多利亚酵母 NPCC 1263 控制梨采后腐烂的功效。这两种酵母菌株的人体安全性最初是通过评估体温生长、假菌丝生长、磷脂酶产生和模拟胃液中的生长来测定的。随后,在包含基于甘蔗糖蜜加尿素的 18 L 培养基的生物反应器 (22 L) 中生产酵母生物质。产生的生物质,添加/不添加 CaCl2 (2% w/v),用于在 Beurre d'Anjou 和 Packham's Triumph 梨上以半商业规模进行的生物防治实验。Vishniacozyma victoriae NPCC 1263 加 CaCl2 在控制由膨胀青霉和灰葡萄孢引起的腐烂方面表现出很高的性能。在 Beurre d'Anjou cv 上,在商业储存 90 天后,P. expansum 和 B. cinerea 的发生率分别降低了 70% 和 100%。在 Packham's Triumph 上,150 天后两种腐烂形式的发生率为 63%。这两种拮抗酵母能够在果实表面建立并定殖,估计在收获后期间种群密度增加了大约三个数量级。这项工作是第一个评估和证明在半商业条件下使用区域酵母进行局部生物防治实验的功效的工作。在商业储存 90 天后,灰霉病的发病率分别降低了 70% 和 100%。在 Packham's Triumph 上,150 天后两种腐烂形式的发生率为 63%。这两种拮抗酵母能够在果实表面建立并定殖,估计在收获后期间种群密度增加了大约三个数量级。这项工作是第一个评估和证明在半商业条件下使用区域酵母进行局部生物防治实验的功效的工作。在商业储存 90 天后,灰霉病的发病率分别降低了 70% 和 100%。在 Packham's Triumph 上,150 天后两种腐烂形式的发生率为 63%。这两种拮抗酵母能够在果实表面建立并定殖,估计在收获后期间种群密度增加了大约三个数量级。这项工作是第一个评估和证明在半商业条件下使用区域酵母进行局部生物防治实验的功效的工作。在收获后期间,估计人口密度增加了大约三个数量级。这项工作是第一个评估和证明在半商业条件下使用区域酵母进行局部生物防治实验的功效的工作。在收获后期间,估计人口密度增加了大约三个数量级。这项工作是第一个评估和证明在半商业条件下使用区域酵母进行局部生物防治实验的功效的工作。
更新日期:2020-11-01
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