Diversity and chemotaxis of soil bacteria with antifungal activity against <i>Fusarium</i> wilt of banana

Li, Ping; Ma, Lan; Feng, Yun; Mo, Ming He; Yang, Fa Xiang; Dai, Hao; Zhao, You Xing

doi:10.1007/s10295-012-1163-4

Cited by 27 publications

(21 citation statements)

References 35 publications

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“…1). This genus is widely distributed in the environment and known as an antagonist of soil-borne pathogens, including Fusarium [9][10][11]. Comparing these results with those from our previous DNA-based analyses [7], we found the same patterns/dynamics for all bacterial families and functions detected in both studies (Fig.…”

supporting

confidence: 82%

“…Comparing the contrasting bean cultivars, we found higher activity of taxa affiliated to Paenibacillaceae in the Foxresistant rhizosphere. Several members of this bacterial family are well known for the production of antibiotics with inhibitory activity against phytopathogenic fungi [9]. Within this family, the genus Paenibacillus was found abundantly in the rhizosphere of the Fox-resistant cultivar ( Supplementary Fig.…”

mentioning

confidence: 99%

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Breeding for soil-borne pathogen resistance impacts active rhizosphere microbiome of common bean

Mendes

Raaijmakers

et al. 2018

The ISME Journal

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Over the past century, plant breeding programs have substantially improved plant growth and health, but have not yet considered the potential effects on the plant microbiome. Here, we conducted metatranscriptome analysis to determine if and how breeding for resistance of common bean against the root pathogen Fusarium oxysporum (Fox) affected gene expression in the rhizobacterial community. Our data revealed that the microbiome of the Fox-resistant cultivar presented a significantly higher expression of genes associated with nutrient metabolism, motility, chemotaxis, and the biosynthesis of the antifungal compounds phenazine and colicin V. Network analysis further revealed a more complex community for Fox-resistant cultivar and indicated Paenibacillus as a keystone genus in the rhizosphere microbiome. We suggest that resistance breeding in common bean has unintentionally co-selected for plant traits that strengthen the rhizosphere microbiome network structure and enrich for specific beneficial bacterial genera that express antifungal traits involved in plant protection against infections by root pathogens.

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confidence: 82%

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confidence: 99%

Breeding for soil-borne pathogen resistance impacts active rhizosphere microbiome of common bean

Mendes

Raaijmakers

et al. 2018

The ISME Journal

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“…Briefly, bacteria were grown in LB medium at 37 °C and 200 rpm. At the log phase (OD600 = 0.4), bacterial cells were harvested and washed three times with MM solution 55, 56 , then resuspended in the same MM solution (OD600 = 0.4). The mixed organic acids (final concentration 120 μmol/L) were added to the swarm plate medium before pouring into the plates.…”

Section: Methodsmentioning

confidence: 99%

The role of organic acids on microbial deterioration in the Radix pseudostellariae rhizosphere under continuous monoculture regimes

Zhu

et al. 2017

Sci Rep

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A three-year field monoculture trial of Radix pseudostellariae and complementary laboratory studies were conducted to further elucidate the underlying mechanism responsible for significant decreases in the biomass yield and quality of R. pseudostellariae under continuous monoculture regimes. HPLC analysis indicated that continuous monoculture soil was rich in organic acids, which had cumulative effects over time. Further analysis suggested that the application of a mixture of organic acids significantly promoted growth of pathogenic fungi, and increased the expression of chemotaxis-related gene (cheA) and biofilm formation of the specific pathogenic Kosakonia sacchari. However, opposite reactions were observed in the case of Bacillus megaterium and Bacillus pumilus. Concurrently, the present results revealed that the mixed organic acids stimulated the production of toxins, as well as H2O2 in the pathogenic fungi. Furthermore, the presence of organic acids reflecting environmental conditions under monocropping had negative effects on the expression of the biocontrol-related genes, which resulted in attenuated antagonistic activities of plant growth-promoting rhizobacteria (PGPR) to suppress mycelial growth of the pathogenic fungi. These results help to unveil the mechanisms associated with how accumulated organic acids differentially mediate deterioration of soil microbial composition and structure in monocropping system.

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“…Soil microorganisms and soil enzyme activities play important roles in biochemical processes in the rhizosphere ecosystem including nutrient cycling, decomposition of organic matter and suppression of soil-borne pathogens (Li et al 2012). The plant can affect its rhizosphere microbial community by release of root exudates (Kourtev et al 2003).…”

Section: Introductionmentioning

confidence: 99%

Biochemical and microbial properties of rhizospheres under maize/peanut intercropping

Chen

et al. 2016

Journal of Integrative Agriculture

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Maize/peanut intercropping system shows the significant yield advantage. Soil microbes play major roles in soil nutrient cycling and were affected by intercropping plants. This experiment was carried out to evaluate the changing of rhizosphere microbial community composition, and the relationship between microbial community and soil enzymatic activities, soil nutrients in maize/peanut intercropping system under the following three treatments: maize (Zea mays L.) and peanut (Arachis hypogaea L.) were intercropped without any separation (NS), by half separation (HS) using a nylon net (50µm) and complete separation (CS) by using a plastic sheet, respectively. The soil microbial communities were assessed by phospholipid fatty acid (PLFA). We found that soil available nutrients (avail N and Avail P) and enzymatic activities (soil urase and phosphomonoesterase) in both crops were improved in NS and HS treatments as compared to CS. Both bacterial and fungal biomasses in both crops were increased in NS followed by HS. Furthermore, gram-positive bacteria (G+) in maize soils were significant higher in NS and HS than CS, while the gram-negative (G-) was significant higher in peanut soil. The ratio of normal saturated to monounsaturated PLFAs (NS/MS) was significantly higher in rhizosphere of peanut under CS treatment than in any other treatments, which is an indicator of nutrient stress. Redundancy analysis and cluster analysis of PLFA showed rhizospheric microbial community of NS and HS of both plants tended to be consistent. The urase and Avail N were higher in NS and HS of both plants and positively correlated with bacteria, fungi (F) and total PLFA, while negatively correlated with G+/G-and NS/MS. The findings suggest that belowground interactions in maize and peanut intercropping system play important roles in changing the soil microbial composition and the dominant microbial species, which was closely related with the improving of soil available nutrients (N and P) and enzymatic activities.

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Diversity and chemotaxis of soil bacteria with antifungal activity against Fusarium wilt of banana

Cited by 27 publications

References 35 publications

Breeding for soil-borne pathogen resistance impacts active rhizosphere microbiome of common bean

Breeding for soil-borne pathogen resistance impacts active rhizosphere microbiome of common bean

The role of organic acids on microbial deterioration in the Radix pseudostellariae rhizosphere under continuous monoculture regimes

Biochemical and microbial properties of rhizospheres under maize/peanut intercropping

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