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辣椒连作障碍土壤中的真菌群落结构特征

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连作障碍是目前制约我国辣椒产业可持续发展的重要因素.解析土传病害中健康土壤和发病土壤的微生物互作机制,可为缓解辣椒连作障碍提供理论支持.以连续种植多年的辣椒健康土壤和发病土壤为研究对象,利用ITS高通量测序技术解析辣椒健康土壤与发病土壤的真菌群落特征,并通过相关性分析及随机森林模型构建,进一步阐述健康土壤的核心关键物种.结果发现,发病土壤具有病原真菌物种多样性增多的特征,其中新赤壳属(Neocosmospora)和镰刀菌属(Fusarium)是导致辣椒病害的主要生物因素.通过健康土壤中的核心微生物与发病率和病原菌相关性随机森林分析发现,梭孢壳属(Thielavia)和丝葚霉属(Papulaspora)可能具有抑制病原菌种群丰度及降低辣椒发病率的作用.研究结果可为辣椒连作障碍的解析和解决提供理论及技术支撑.
Characteristics of Fungal Community Structure in Soils with Continuous Cropping Obstacles of Pepper
Continuous cropping obstacle is currently an important problem restricting the sustainable development of the pepper industry in China.Analyzing the microbial interactions between healthy soils and soils with soil-borne diseases can provide theoretical support for alleviating the continuous cropping obstacle of peppers.In this paper,healthy and diseased soils of peppers grown continuously for many years were studied.The fungal communities in healthy and diseased soils of peppers were characterized using ITS high-throughput sequencing.The core keystone species for healthy soils were further explored through correlation analysis and random forest model construction.The results showed that the pathogenic soils was characterized by an increased diversity of pathogenic fungal species,with Neocosmospora and Fusarium being the main biological factors responsible for pepper disease.A random forest analysis of core microorganisms in healthy soils correlated with morbidity and pathogens revealed the ability of Thielavia and Papulaspora to suppress pathogen population abundance and pepper morbidity.These results provided theoretical and technical supports for the resolution of continuous crop obstacle in pepper cultivation.

peppercontinuous crop obstaclefungal community

陈梦、刘秋梅、李德军、游甜、葛旭、欧立军

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蔬菜生物学湖南省重点实验室,湖南农业大学园艺学院,长沙 410128

中国科学院亚热带农业生态研究所亚热带农业生态过程重点实验室,长沙 410125

中国科学院环江喀斯特生态系统观测研究站,广西河池 547100

辣椒 连作障碍 真菌群落

国家自然科学基金湖南省自然科学基金广西八桂学者建设工程专项

422010682023JJ40647

2024

辣椒杂志
辣椒新品种技术研究推广中心

辣椒杂志

影响因子:0.205
ISSN:1672-4542
年,卷(期):2024.22(1)
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