Continuous-cropping-tolerant soybean cultivars alleviate continuous cropping obstacles by improving structure and function of rhizosphere microorganisms

Liu, Wenbo; Wang, Nan; Yao, Xingdong; He, Dalong; Sun, Hexiang; Ao, Xue; Wang, Haiying; Zhang, Huijun; Martin, Steven St.; Xie, Futi; Wang, Jingkuan

doi:10.3389/fmicb.2022.1048747

Cited by 9 publications

(4 citation statements)

References 68 publications

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“…Liu ( 10 ) reported that biotic, rather than abiotic, factors were the primary reasons for the continuous barriers to soybean. Soil microbes are important in promoting the decomposition of organic matter, nutrient cycling, plant heathland, and growth promotion ( 32 ), which are useful for soil health ( 33 ). Some studies reported that continuous cropping altered the structure of the fungal community and caused pathogen emergence, which was known to inhibit the growth of plants ( 34 , 35 ).…”

Section: Discussionmentioning

confidence: 99%

Effects of continuous cropping on fungal community diversity and soil metabolites in soybean roots

He,

Yao,

Zhang

et al. 2023

Microbiol Spectr

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Microbial community imbalance is the main cause of soybean intercropping, but the mechanism of soybean soil fungal community diversity change induced by continuous cropping is still unclear. This study analyzes the fungal community diversity and the change of fungal communities in compartments of different root systems of intercropped soybeans by high-throughput sequencing (endosphere, rhizoplane, and rhizosphere) between continuous cropping and maize-soybean rotation. The results showed that the community composition and the diversity of compartments of different root systems of intercropped soybeans are different, and fungal diversities showed a decreasing trend from rhizosphere to endosphere. Continuous cropping significantly increased fungal community diversities in different root compartments and changed their formation, enrichment, and depletion processes. Continuous cropping brings about the enrichment of soil pathogens, but only partial soil pathogens could colonize from the rhizosphere to the endosphere. All these suggested that root compartments had selective effects on root-associated fungal community diversity. Additionally, metabolomics assay revealed that continuous cropping soybean markedly altered soil metabolic profiling. Correlation analysis results showed that fungal community diversity was significantly correlated with soil metabolites. To sum up, under different planting patterns, the diversity and the functional mode of soybean soil microbial community have changed. Continuous cropping has increased the abundance of pathogenic fungi in soybean soil, resulting in changes in the correlation between soil fungi and metabolites, and then changed the soil metabolic spectrum. IMPORTANCE Soybean yield can be affected by soybean soil fungal communities in different tillage patterns. Soybean is an important food crop with great significance worldwide. Continuous cultivation resulted in soil nutrient deficiencies, disordered metabolism of root exudates, fungal pathogen accumulation, and an altered microbial community, which brought a drop in soybean output. In this study, taking the soybean agroecosystem in northeast China, we revealed the microbial ecology and soil metabolites spectrum, especially the diversity and composition of soil fungi and the correlation of pathogenic fungi, and discussed the mechanisms and the measures of alleviating the obstacles.

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Section: Discussionmentioning

confidence: 99%

Effects of continuous cropping on fungal community diversity and soil metabolites in soybean roots

He,

Yao,

Zhang

et al. 2023

Microbiol Spectr

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“…Previous studies have demonstrated significant variations in soil microbial structure among different genotypes of the same crop ( Weinert et al., 2011 ), influencing responses to continuous cropping by affecting soil nutrient content and crop disease resistance ( Priyanka et al., 2020 ; Maria-Soledad et al., 2021 ). For example, studies on soybean varieties have revealed that tolerant varieties exhibit higher levels of beneficial bacteria, increased available nutrient content, and enhanced activities of nitrogen and phosphorus cycling enzymes than sensitive varieties ( Liu et al., 2023 ). Microbial functions may serve as the primary mechanisms explaining these phenomena.…”

Section: Discussionmentioning

confidence: 99%

Accumulation patterns of tobacco root allelopathicals across different cropping durations and their correlation with continuous cropping challenges

Zhou,

Pan,

Zhang

et al. 2024

Front. Plant Sci.

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IntroductionContinuous cropping challenges have gradually emerged as pivotal factors limiting the sustainable development of agricultural production. Allelopathicals are considered to be the primary obstacles. However, there is limited information on allelopathic accumulation across various continuous cropping years and its correlation with the associated challenges.MethodsTobacco was subjected to varying planting durations: 1 year (CR), 5 years (CC5), 10 years (CC10), and 15 years (CC15).ResultsOur findings unveiled discernible disparities in tobacco growth patterns across diverse continuous cropping periods. Notably, the most pronounced challenges were observed in the CC5 category, characterized by yield reduction, tobacco black shank outbreaks, and a decline in beneficial flora. Conversely, CC15 exhibited a substantial reduction in challenges as the continuous cropping persisted with no significant differences when compared to CR. Within the tobacco rhizosphere, we identified 14 distinct allelopathic compounds, with 10 of these compounds displaying noteworthy variations among the four treatments. Redundancy analysis (RDA) revealed that eight allelopathic compounds exhibited autotoxic effects on tobacco growth, with MA, heptadecanoic acid, and VA ranking as the most potent inhibitors. Interaction network highlighted the pivotal roles of VA and EA in promoting pathogen proliferation and impeding the enrichment of 13 beneficial bacterial genera. Furthermore, a structural equation model elucidated that MA and EA primarily exert direct toxic effects on tobacco, whereas VA fosters pathogen proliferation, inhibits the enrichment of beneficial bacteria, and synergistically exacerbates the challenges associated with continuous cropping alongside EA.DiscussionThese findings suggested discernible disparities in tobacco growth patterns across the various continuous cropping periods. The most pronounced challenges were observed in CC5, whereas CC15 exhibited a substantial reduction in challenges as continuous cropping persisted. VA may play a pivotal role in this phenomenon by interacting with pathogens, beneficial bacterial genera, and EA.

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“…Since continuous cropping reduced the soil fertility, the life strategy of rhizosphere microbiota shifted from r to K 8 . Decrease in soil enzyme activities were also reported, which indicated the degradation in soil ecological function 23 . Root exudates act as a bridge connecting plant and rhizosphere microbiota 24 .…”

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Root exudates and rhizosphere microbiota in responding to long-term continuous cropping of tobacco

Li,

Jin,

Zhang

et al. 2024

Sci Rep

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Soil sickness a severe problem in tobacco production, leading to soil-borne diseases and reduce in tobacco yield. This occurs as a result of the interaction between root exudates and rhizosphere microorganisms, which is however, little studied until now. By combining the field investigation and pot experiment, we found the output yield consistently decreased during the first 10 years of continuous cropping in a tobacco field, but increased at the 15th year (15Y). The root exudate and rhizosphere bacterial community was further analyzed to reveal the underlying mechanism of the suppressive soil formation. Root exudate of 15Y tobacco enriched in amino acids and derivatives, while depleted in the typical autotoxins including phenolic acids and alkaloids. This was correlated to the low microbial diversity in 15Y, but also the changes in community composition and topological properties of the co-occurrence network. Especially, the reduced autotoxins were associated with low Actinobacteria abundance, low network complexity and high network modularity, which significantly correlated with the recovered output yield in 15Y. This study revealed the coevolution of rhizosphere microbiota and root exudate as the soil domesticated by continuous cropping of tobacco, and indicated a potential role of the autotoxins and theirs effect on the microbial community in the formation of suppressive soil.

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Continuous-cropping-tolerant soybean cultivars alleviate continuous cropping obstacles by improving structure and function of rhizosphere microorganisms

Cited by 9 publications

References 68 publications

Effects of continuous cropping on fungal community diversity and soil metabolites in soybean roots

Effects of continuous cropping on fungal community diversity and soil metabolites in soybean roots

Accumulation patterns of tobacco root allelopathicals across different cropping durations and their correlation with continuous cropping challenges

Root exudates and rhizosphere microbiota in responding to long-term continuous cropping of tobacco

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