数字农科院2.0

Biocontrol effect of Bullera alba PGY-2 on postharvest black spot of pear and insights into the associated defense mechanisms

文献类型： 外文期刊

作者： Yu, Xiaoyan;Zhang, Kuan;Yang, Zhiqi;Guo, Bowen;Yang, Xinru;Zhang, Yan;Liu, Jiayi;Zhao, Zhenhua;Wang, Xiangjing;Zhao, Junwei;Xiang, Wensheng

作者机构：

关键词： Pear;Bullera alba;Biocontrol;Defense enzyme activity;Transcriptomics;Secondary metabolites

期刊名称： POSTHARVEST BIOLOGY AND TECHNOLOGY

ISSN： 0925-5214

年卷期： 2025 年 234 卷

页码：

收录情况： SCIE（2025版）

摘要： This study evaluated Bullera alba PGY-2 as a biocontrol agent against pear black spot caused by Alternaria alternata. Bullera alba PGY-2 significantly reduced disease incidence by 73.28 % and lesion diameter by 47.61 %, with higher efficacy when applied prior to pathogen inoculation. It was capable of rapid colonization and stable growth at pear wounds under both 25 degrees C and 4 degrees C, demonstrating strong adaptability and competitiveness against A. alternata for nutrients and space. Bullera alba PGY-2 enhanced the activity of POD, PPO, PAL, and CHI closely associated with disease resistance in plants. It also upregulated the expression of genes in plant defense-related pathways, including flavonoid biosynthesis, phenylpropanoid biosynthesis, and glutathione metabolism. Furthermore, B. alba PGY-2 increased the accumulation of phenolics, flavonoids, and lignin, strengthening pear resistance to black spot. These findings highlight the potential of B. alba PGY-2 as an effective biocontrol agent and provide novel insights into its physiological and molecular defense mechanisms.

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