Soil management in a mountain agroecosystem and clubroot disease

Clubroot, caused by Plasmodiophora brassicae, is a disease limiting the production of Brassica species. Its severity varies according to the density of the pathogen's resting spores and environmental conditions. Although the soil environment (including its physical, chemical and biological char...

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Bibliographic Details
Published in:Plant pathology 2020-02, Vol.69 (2), p.302-309
Main Authors: Bhering, A. S., Carmo, M. G. F., Coelho, I. S., Lima, E. S. A., Carvalho, C. F., Saraiva, A. L. R. F., Passos, S. R., Amaral Sobrinho, N. M. B.
Format: Article
Language:English
Subjects:
Acidic soils
Acidity
acidity potential
Agricultural ecosystems
Bacteria
Brassica
Brassica oleracea var. botrytis
Cauliflowers
Clubroot
Composition
Disease control
Environmental conditions
Mountains
Organic chemistry
Organic matter
Organic soils
Pathogens
Plasmodiophora brassicae
Population
Soil conditions
Soil environment
Soil investigations
Soil management
Soil microorganisms
Soils
Spores
Tropical environment
Tropical environments
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Summary:Clubroot, caused by Plasmodiophora brassicae, is a disease limiting the production of Brassica species. Its severity varies according to the density of the pathogen's resting spores and environmental conditions. Although the soil environment (including its physical, chemical and biological characteristics) is determinant in the development of the disease, little is known regarding these characteristics in tropical regions, such as Brazil. The objective of this study was to investigate the relationships between soil attributes, bacterial population composition and clubroot intensity in a tropical mountain agroecosystem. Soil and plant samples were collected from 17 cauliflower‐producing localities in Nova Friburgo, Brazil. The physical and chemical attributes, the bacterial population composition, the number of pathogen resting spores in the soil samples, and the clubroot severity were evaluated. Based on bacterial population composition, two distinct groups of soils were identified, which varied in attributes such as organic matter, potential acidity, pH and disease severity. The organic matter level was associated with differences in soil acidity, bacterial population composition and disease intensity, but there was not a cause and effect relationship between bacterial population composition and clubroot severity. Under the conditions of this agroecosystem, soils with increased organic matter presented higher acidity potential (H + Al), which was strongly correlated to clubroot severity. Thus, high acidity potential could be a key factor leading to clubroot development in mountain regions of Brazil. Inadequate management and intensive application of fresh poultry litter in mountain tropical soils interfere with bacterial community composition and increase the severity of clubroot in cauliflower.
ISSN:0032-0862
1365-3059
DOI:10.1111/ppa.13123