Effects of a three-year maize-soybean rotation on soil bacterial diversity and fumonisin-producing Fusarium spp. inoculum potential.
7 affiliations
- 1Department of Phytopathology, Laboratory of Biological Control of Plant Diseases, Universidade Federal de Lavras (UFLA), Lavras, 37200-000, MG, Brazil.
- 2Department of Phytopathology, Laboratory of Biological Control of Plant Diseases, Universidade Federal de Lavras (UFLA), Lavras, 37200-000, MG, Brazil. [email protected].
- 3Department of Phytopathology, Universidade Federal de Lavras (UFLA), Lavras, 37200-000, MG, Brazil. [email protected].
- 4Department of Soil Science, Sector of Biology, Microbiology and Biological Processes, Universidade Federal de Lavras (UFLA), Lavras, 37200-000, MG, Brazil.
- 5Department of Plant, Soil and Microbial Sciences, Center for Microbial Ecology, Michigan State University, East Lansing, MI, 48824, USA.
- 6Department of Phytopathology, Laboratory of Biological Control of Plant Diseases, Universidade Federal de Lavras (UFLA), Lavras, 37200-000, MG, Brazil. [email protected].
- 7Department of Phytopathology, Universidade Federal de Lavras (UFLA), Lavras, 37200-000, MG, Brazil. [email protected].
Abstract
Maize-soybean succession dominates grain production in tropical Brazil, and rotation is often recommended to improve soil health. However, few field studies have followed both soil bacterial diversity and fumonisin-producing pathogens over several seasons in tropical no-till systems. We compared continuous maize, continuous soybean and maize-soybean rotation for three seasons (2016-2017 to 2018-2019). In a fourth season (2019-2020), maize was grown in all plots to test legacy effects. Bacterial communities were profiled by 16 S rRNA (V3-V4) amplicon sequencing. The fum1 gene of fumonisin-producing Fusarium spp. was quantified by qPCR in soil and in maize stalks left on the soil surface. In the first three seasons, rotation did not detectably increase bacterial diversity, although statistical power was low (n = 4 plots; post-hoc power 12-61%). Community composition differed among seasons and was associated with antecedent precipitation as Actinobacteria were most abundant in the driest season. In the fourth season, a continuous-soybean history was associated with higher bacterial richness and Shannon diversity in the maize rhizosphere at tasselling than a rotation history, whereas bulk-soil diversity did not differ among land uses. A rotation history was associated with lower fum1 abundance in bulk soil. In contrast, continuous maize was associated with lower fum1 in stalks (third season), less stalk rot and fewer infected grains. Soil and crop residues therefore responded differently to rotation. Given the single site and limited plot-level replication, these findings should be regarded as hypothesis-generating.
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BibTeX
@article{almeida2026effects,
title = {{Effects of a three-year maize-soybean rotation on soil bacterial diversity and fumonisin-producing Fusarium spp. inoculum potential.}},
author = {Kize Alves Almeida and Rafaela Araújo Guimarães and Victor Biazzotto Correia Porto and Luiz Flávio Machado Góes and Fatima Maria Souza de Moreira and John Quensen and James Tiedje and Flávio Henrique Vasconcelos de Medeiros},
journal = {World journal of microbiology \& biotechnology},
year = {2026},
month = oct,
doi = {10.1007/s11274-026-05358-2},
url = {https://europepmc.org/article/MED/42900414},
note = {CC BY},
}
RIS
TY - JOUR
TI - Effects of a three-year maize-soybean rotation on soil bacterial diversity and fumonisin-producing Fusarium spp. inoculum potential.
AU - Kize Alves Almeida
AU - Rafaela Araújo Guimarães
AU - Victor Biazzotto Correia Porto
AU - Luiz Flávio Machado Góes
AU - Fatima Maria Souza de Moreira
AU - John Quensen
AU - James Tiedje
AU - Flávio Henrique Vasconcelos de Medeiros
PY - 2026
DA - 2026/10/20
JO - World journal of microbiology & biotechnology
DO - 10.1007/s11274-026-05358-2
UR - https://europepmc.org/article/MED/42900414
AB - Maize-soybean succession dominates grain production in tropical Brazil, and rotation is often recommended to improve soil health. However, few field studies have followed both soil bacterial diversity and fumonisin-producing pathogens over several seasons in tropical no-till systems. We compared continuous maize, continuous soybean and maize-soybean rotation for three seasons (2016-2017 to 2018-2019). In a fourth season (2019-2020), maize was grown in all plots to test legacy effects. Bacterial communities were profiled by 16 S rRNA (V3-V4) amplicon sequencing. The fum1 gene of fumonisin-producing Fusarium spp. was quantified by qPCR in soil and in maize stalks left on the soil surface. In the first three seasons, rotation did not detectably increase bacterial diversity, although statistical power was low (n = 4 plots; post-hoc power 12-61%). Community composition differed among seasons and was associated with antecedent precipitation as Actinobacteria were most abundant in the driest season. In the fourth season, a continuous-soybean history was associated with higher bacterial richness and Shannon diversity in the maize rhizosphere at tasselling than a rotation history, whereas bulk-soil diversity did not differ among land uses. A rotation history was associated with lower fum1 abundance in bulk soil. In contrast, continuous maize was associated with lower fum1 in stalks (third season), less stalk rot and fewer infected grains. Soil and crop residues therefore responded differently to rotation. Given the single site and limited plot-level replication, these findings should be regarded as hypothesis-generating.
SN - 1573-0972
ER -