密旋链霉菌Act12对柑橘采后酸腐病及果实品质的影响

doi:10.3969/j.issn.1674-7968.2024.11.017

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Abstract Citrus sour rot is the common citrus (Citrus reticulata) postharvest disease which can cause fruit rot and acidity, seriously affect the storage effect. Microbial control of citrus acid rot has the advantages of being green, environmentally friendly, and no drug resistant, and is the direction for the healthy development of agriculture. In this study, the effect of Streptomyces pactum Act12 against the sour rot pathogen Geotrichum candidum was evaluated by plate confrontation culture method and growth rate method, the control effect was verified by acupuncture inoculation method, and the effects of filtrate on citrus resistant enzymes, resistant substances, and fruit quality were determined. The results showed that the inhibition rate of Act12 against Geotrichum candidum was 76.04%, and the inhibition rate of 20% fermentation filtrate against Geotrichum candidum reached 97.17%. Act12 had antibacterial activity against 8 types of pathogens derived from fruit. The filtrate significantly decreased the disease index of citrus sour rot (P<0.05), showing control effect of 88.20%. After treatment with 20% fermentation filtrate, the activities of fruit resistance enzymes - polyphenol oxidase (PPO), phenylalanine ammonia-lyase (PAL), chitinase (CHI), and glucanase (GLU), as well as the total phenolic and flavonoid content of the fruit peel were significantly increased (P<0.05), while the content of soluble solids and reducing sugars was significantly increased (P<0.05). The titratable acidity was significantly decreased (P<0.05), and the fruit quality was improved. This study provides theoretical reference and new resources for the biological control of postharvest sour rot in citrus fruits.

Key words： Citrus sour rot Streptomyces pactum Antagonistic disease prevention Quality

Received: 10 November 2023

ZTFLH:

S432.1

Corresponding Authors: *zhy2219@163.com

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	Articles by authors
	QI Hua-Ling
	CHEN Ying-Ying
	ZHOU Yan
	LIU Kai-Dong
	ZHANG Hong-Yan

Cite this article:

QI Hua-Ling,CHEN Ying-Ying,ZHOU Yan, et al. Effect of Streptomyces pactum Act12 on Postharvest Sour Rot of Citrus (Citrus reticulata) and Fruit Quality[J]. 农业生物技术学报, 2024, 32(11): 2640-2648.

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https://journal05.magtech.org.cn/Jwk_ny/EN/10.3969/j.issn.1674-7968.2024.11.017 OR https://journal05.magtech.org.cn/Jwk_ny/EN/Y2024/V32/I11/2640

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