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Continuous Cropping Duration Alters Green Pepper Root Exudate Composition and Triggers Rhizosphere Feedback Inhibition.

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Title: Continuous Cropping Duration Alters Green Pepper Root Exudate Composition and Triggers Rhizosphere Feedback Inhibition.
Authors: Li, Zhou1 (AUTHOR), Lian, Dongmei1,2 (AUTHOR), Zhang, Shaoping1 (AUTHOR), Yao, Yunfa1,2 (AUTHOR), Lin, Bizhen1 (AUTHOR), Hong, Jianji1 (AUTHOR), Wu, Songhai1 (AUTHOR), Li, Honghong2 (AUTHOR)
Source: Agronomy. Aug2025, Vol. 15 Issue 8, p2010. 17p.
Subject Terms: *PLANT exudates, *SOIL degradation, *BELL pepper, *CROP management, *ALDEHYDES, *MICROBIAL communities, *CROPPING systems
Abstract: Continuous cropping poses a significant threat to sustainable pepper production by triggering soil degradation and growth inhibition, yet the role of root exudates in this process remains unclear. This study aimed to elucidate how continuous cropping duration (0, 1, 2, and 6 years) alters root exudate composition and drives rhizosphere feedback in green pepper. Pot experiments revealed that long-term continuous cropping (6 years) severely inhibited pepper growth, reducing photosynthetic rate (32.02%), chlorophyll content (12.26%), plant height (23.89%), and yield (42.37%). Critically, the relative abundance of 3,4-dimethylbenzaldehyde in root exudates increased progressively with cropping duration. Exogenous application of this compound or long-term monoculture extracts reduced soil pH and increased electrical conductivity, altered the rhizosphere microbial community (notably decreasing Proteobacteria abundance and fungal diversity while increasing Bacteroidota and Firmicutes), and significantly inhibited root development and vitality. Correlation analysis indicated that fungal communities were more responsive to soil property changes, while bacterial communities correlated more closely with root traits. This study demonstrates that the accumulation of specific root exudates, particularly 3,4-dimethylbenzaldehyde, is a key driver of continuous cropping obstacles in green pepper by disrupting rhizosphere microbial community structure and soil properties. This highlights the importance of managing root exudate dynamics, potentially through crop rotation or soil amendments, to mitigate these obstacles. [ABSTRACT FROM AUTHOR]
Database: Academic Search Index
Description
Abstract:Continuous cropping poses a significant threat to sustainable pepper production by triggering soil degradation and growth inhibition, yet the role of root exudates in this process remains unclear. This study aimed to elucidate how continuous cropping duration (0, 1, 2, and 6 years) alters root exudate composition and drives rhizosphere feedback in green pepper. Pot experiments revealed that long-term continuous cropping (6 years) severely inhibited pepper growth, reducing photosynthetic rate (32.02%), chlorophyll content (12.26%), plant height (23.89%), and yield (42.37%). Critically, the relative abundance of 3,4-dimethylbenzaldehyde in root exudates increased progressively with cropping duration. Exogenous application of this compound or long-term monoculture extracts reduced soil pH and increased electrical conductivity, altered the rhizosphere microbial community (notably decreasing Proteobacteria abundance and fungal diversity while increasing Bacteroidota and Firmicutes), and significantly inhibited root development and vitality. Correlation analysis indicated that fungal communities were more responsive to soil property changes, while bacterial communities correlated more closely with root traits. This study demonstrates that the accumulation of specific root exudates, particularly 3,4-dimethylbenzaldehyde, is a key driver of continuous cropping obstacles in green pepper by disrupting rhizosphere microbial community structure and soil properties. This highlights the importance of managing root exudate dynamics, potentially through crop rotation or soil amendments, to mitigate these obstacles. [ABSTRACT FROM AUTHOR]
ISSN:20734395
DOI:10.3390/agronomy15082010