Effects of Agricultural Management on Rhizosphere Microbial Structure and Function in Processing Tomato Plants

Schmidt, Jennifer E.; Vannette, Rachel L.; Igwe, Alexandria; Blundell, Rob; Casteel, Clare L.; Gaudin, Amélie C. M.

doi:10.1128/aem.01064-19

Cited by 33 publications

(24 citation statements)

References 80 publications

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“…The effects of Ca and K on structure of soil bacterial communities have been reported in forest soils (Uroz et al, 2011) and agricultural soils (Schmidt et al, 2019). Our study reaffirmed the importance of these base cations in shaping bacterial community structures and intra-taxa associations in tea plantation soils.…”

Section: Effect Of Soil Properties On Shaping Soil Bacterial Communitiessupporting

confidence: 82%

Variations in soil nutrient dynamics and bacterial communities in long-term tea monoculture production systems

Gui

Lichao

Wang

et al. 2021

Preprint

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Long-term monoculture agriculture systems could lead to soil degradation and yield decline. The ways in which soil microbiotas interact with one another, particularly in response to long-term tea monoculture systems are currently unclear. In this study, through the comparison of three independent tea plantations across eastern China composed of varying stand ages (from 3 years to 90 years after conversion from forest), we found that long-term tea monoculture led to significant increases in soil total organic carbon (TOC) and microbial nitrogen (MBN). Additionally, the structure, function and co-occurrence network of soil microbial communities were investigated by pyrosequencing 16S rRNA genes. The pyrosequencing analysis revealed that structures and functions of soil bacterial communities were significantly affected by different stand ages of tea plantations, but sampling sites and land-use conversion (from forest to tea plantation) still outcompeted stand age to control the diversity and structure of soil bacterial communities. Further RDA analysis revealed that the C and N availability improvement in tea plantation soils led to variation of structure and function in soil microbial communities. Moreover, co-occurrence network analysis of soil bacterial communities also demonstrated that interactions among soil bacteria taxa were strengthened with the increasing stand age of respective tea stands. Overall, this study provides a comprehensive understanding of the impact of long-term monoculture stand age on soil nutrient dynamics and bacterial communities in tea production.

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Section: Effect Of Soil Properties On Shaping Soil Bacterial Communitiessupporting

confidence: 82%

Variations in soil nutrient dynamics and bacterial communities in long-term tea monoculture production systems

Gui

Lichao

Wang

et al. 2021

Preprint

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“…The addition of organic fertilizer will change soil physical and chemical properties, and also improve soil enzyme activity 42 . These changes in soil environment are closely related to the structure of microorganisms 43,44 . Besides, the application of organic fertilizer will inevitably affect the nutrient content of soil.…”

Section: Discussionmentioning

confidence: 99%

Streptomyces sp. strain TOR3209: a rhizosphere bacterium promoting growth of tomato by affecting the rhizosphere microbial community

et al. 2020

Sci Rep

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Aiming at revealing the possible mechanism of its growth promoting effect on tomato, the correlations among Streptomyces sp. TOR3209 inoculation, rhizobacteriome, and tomato growth/production traits were investigated in this study. By analyses of Illumina sequencing and plate coating, differences in rhizosphere microbial communities were found in different growth stages and distinct inoculation treatments. The plant biomass/fruit yields and relative abundances of families Flavobacteriaceae, Sphingobacteriaceae, Polyangiaceae and Enterobacteriaceae in treatments T (tomato inoculated with TOR3209) and TF (tomato inoculated with TOR3209 + organic fertilizer) were higher than that in the controls (CK and CK+ organic fertilizer), respectively. The analysis of Metastats and LEfSe revealed that the genera Flavobacterium and Sorangium in seedling stage, Klebsiella in flowering stage, Collimonas in early fruit setting stage, and genera Micrococcaceae, Pontibacte and Adhaeribacter in late fruit setting stage were the most representative rhizobacteria that positively responded to TOR3209 inoculation. By cultivation method, five bacterial strains positively correlated to TOR3209 inoculation were isolated from rhizosphere and root endosphere, which were identified as tomato growth promoters affiliated to Enterobacter sp., Arthrobacter sp., Bacillus subtilis, Rhizobium sp. and Bacillus velezensis. In pot experiment, TOR3209 and B. velezensis WSW007 showed joint promotion to tomato production, while the abundance of inoculated TOR3209 was dramatically decreased in rhizosphere along the growth of tomato. Conclusively, TOR3209 might promote the tomato production via changing of microbial community in rhizosphere. These findings provide a better understanding of the interactions among PGPR in plant promotion.

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“…Rhizosphere microbial composition is associated with changes in plant nutrients and defence. Rhizosphere bacteria and fungi, which differ with management 17 , have been previously shown to influence plant health by regulating defence compounds against insect herbivores 34 . We examined if differences in rhizosphere communities were associated with observed differences in plant defence hormones in plants from the different farms.…”

mentioning

confidence: 99%

Organic management promotes natural pest control through altered plant resistance to insects

et al. 2020

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rganic farming is characterized by management practices that promote soil biodiversity and beneficial ecological interactions to offset the need for synthetic inputs such as inorganic fertilizers and biocides. Pest and nutrient management in organic agriculture is largely accomplished through various diversification methods, including cover crops, crop rotations, trap crops and promotion of active soil microbial communities [1][2][3][4][5] . Although organic agriculture is often thought to be less productive in terms of yield as compared to conventional farming, it offers great potential to enhance ecosystem services and agricultural sustainability [5][6][7] .Accumulating evidence suggests that organic management practices also reduce pest populations and increase resilience to pest damage 8,9 . Decreased insect pests on long-term organic farms have largely been attributed to practices that limit pest build-up, increase predator biodiversity, and increase the numbers of beneficial insects [9][10][11][12][13] . The nitrogen contents of plants grown on organic farms are often lower than those of conventional systems 11,12 . Plants that are nitrogen-limited are often less attractive to herbivores, which could also explain the lower pest pressure observed in organic systems 12,14,15 . However, very little is known about the impact of organic management for plant defence capacity.Organic management strategies can increase microbial activity and biomass in soils 1,2,16 , alter microbial communities 17 and in some cases enhance plant associations with beneficial microbes in the rhizosphere 3,4 . Microorganisms that associate with plant roots play a critical role in resistance to abiotic and biotic stress [18][19][20] . Mycorrhizal fungi have been shown to induce plant systemic resistance 21,22 and can reduce susceptibility to pathogens 23 and herbivores 24 . Plant growth-promoting rhizobacteria commonly found in soil microbial pools, as well as commercial inoculants, induce defences and other physiological changes in the host plant that influence above-ground herbivores 19,[25][26][27][28] . Despite the known interactions between organic management, plant-microbe associations and changes in crop resistance, the potential of these interactions to reduce pest damage in agricultural systems remains largely untapped.In this study, we report that organic management influences pest populations through changes in plant resistance. We explore linkages between insect settling and performance, rhizosphere communities and phytohormones related to plant defence with tomato (Solanum lycopersicum) and the beet leafhopper (Circulifer tenellus), an important pest of California's processing tomato industry 29 . We demonstrate that tomatoes grown using conventional management are preferentially settled by leafhopper pests and have lower salicylic acid (SA) levels compared to tomatoes grown using organic management. Our results indicate that differences in insect preference were due at least partially to changes in SA accumulation and rhi...

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Effects of Agricultural Management on Rhizosphere Microbial Structure and Function in Processing Tomato Plants

Cited by 33 publications

References 80 publications

Variations in soil nutrient dynamics and bacterial communities in long-term tea monoculture production systems

Variations in soil nutrient dynamics and bacterial communities in long-term tea monoculture production systems

Streptomyces sp. strain TOR3209: a rhizosphere bacterium promoting growth of tomato by affecting the rhizosphere microbial community

Organic management promotes natural pest control through altered plant resistance to insects

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