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Sugar Protectants Improve the Thermotolerance and Biocontrol Efficacy of the Biocontrol Yeast Candida oleophila

机译：糖类保护剂提高了生防酵母菌嗜油假丝酵母的耐热性和生防功效。

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摘要

A variety of sugar compounds have been used as additives to protect various biocontrol yeasts from adverse environmental stresses. However, studies on maltose and lactose as sugar protectants are limited, and their protective effect is not clear. In the present study, exposure of the biocontrol yeast Candida oleophila cells to 45°C for 10 min, while immersed in either 5 or 10% (w/v) maltose or lactose, provided a significant protective effect. The addition of maltose and lactose significantly enhanced enzyme activity and gene expression of catalase, thioredoxin reductase, and glutathione reductase, relative to cells that have been immersed in sterile distilled water (controls) exposed to 45°C. In addition, C. oleophila cells suspended in maltose and lactose solutions also exhibited higher viability and ATP levels, relative to control cells. Notably, the biocontrol efficacy of C. oleophila against postharvest diseases of apple fruit was maintained after the yeast was exposed to the high temperature treatment while immersed in maltose and lactose solutions. These results demonstrate the potential of maltose and lactose as sugar protectants for biocontrol agent against heat stress.
机译：多种糖化合物已用作添加剂，以保护各种生物防治酵母免受不利的环境压力。然而，关于麦芽糖和乳糖作为糖保护剂的研究是有限的，并且它们的保护作用还不清楚。在本研究中，将生防菌酵母念珠菌细胞暴露于45°C 10分钟，同时浸入5％或10％（w / v）的麦芽糖或乳糖中，可提供显着的保护作用。相对于已浸入暴露于45°C的无菌蒸馏水（对照）中的细胞，麦芽糖和乳糖的添加显着增强了酶活性以及过氧化氢酶，硫氧还蛋白还原酶和谷胱甘肽还原酶的基因表达。另外，相对于对照细胞，悬浮在麦芽糖和乳糖溶液中的嗜油梭菌细胞还表现出更高的生存力和ATP水平。值得注意的是，在将酵母浸入麦芽糖和乳糖溶液中进行高温处理后，保持了油果衣原体对苹果果实采后病的生物防治功效。这些结果证明了麦芽糖和乳糖作为生物防治剂抗热应激的糖保护剂的潜力。

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