Pathogenic and beneficial microorganisms in soilless cultures

Vallance, Jessica; Déniel, F.; Floch, Gaétan Le; Guérin-Dubrana, Lucia; Blancard, Dominique; Rey, Patrice

doi:10.1051/agro/2010018

Cited by 63 publications

(71 citation statements)

References 92 publications

(114 reference statements)

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“…7). These genera compositions were only partially consistent with previous findings [28][29][30]. which was explained by the reason of the unique growth substrate and irrigation water used in this study.…”

Section: Discussionsupporting

confidence: 85%

Microbial community dynamics in the recirculating nutrient solution of tomato plug seedlings cultivated under ebb-and-flow system

Chen¹,

Li²,

Wang³

et al. 2019

Preprint

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Background: The ebb-and-flow system has ability to recirculate water and nutrients, and offers a good method to control nutrient leaching from greenhouses into the environment. However, the potential for the rapid spread of bacterial and fungal pathogens is the main hindrance for its adoption in vegetable seedlings production. Natural microflora has often shown a certain ability to suppress diseases.Results: Here, through 16S rRNA- and ITS1-targeted Illumina sequencing, the dynamic changes in bacterial and fungal communities in the recirculating nutrient solution were characterized for tomato plug seedlings cultivated in an ebb-and-flow system in summer and winter. Both bacterial number and microbial diversity in the nutrient solution increased with recirculating irrigation, and these changes differed between summer and winter. Pseudomonas was among the most predominant bacterial genera in the nutrient solution; its relative abundance gradually increased with recycling in summer but decreased dramatically in winter. In summer, the predominant bacteria also included Comamonas and Sediminibacterium , whose relative abundances in the nutrient solution decreased and increased, respectively. In winter, the nutrient solution was also colonized by Sphingomonas , predominantly at the late stage of irrigation. Among fungi, Amanita and Trichoderma were predominant in both summer and winter. Amanita gradually increased in summer but decreased rapidly after the first irrigation cycle in winter, whereas Trichoderma accumulated rapidly at the late stage of irrigation in both summer and winter. Alternaria and Fusarium were predominant in the nutrient solution only in summer, with the former decreased and the latter increased with recirculating irrigation. Moreover, Pseudomonas mediterranea , a potentially pathogenic bacterium, and Fusarium oxysporum , a fungal pathogen were present predominantly in winter and summer, respectively. Some potentially beneficial microbes functioning in plant-growth promotion and water self-purification, such as Sphingobium xenophagum , Trichoderma harzianum , and T. virens , were identified to be increased in the recirculating nutrient solution.Conclusions: The present data elucidate the bacterial and fungal dynamics in an ebb-and-flow system and provide useful information for pathogen control during tomato seedling production.

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Section: Discussionsupporting

confidence: 85%

Microbial community dynamics in the recirculating nutrient solution of tomato plug seedlings cultivated under ebb-and-flow system

Chen¹,

Li²,

Wang³

et al. 2019

Preprint

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“…Even applied on plants together with biological control agents, chitosan enhanced the efficacy in the control of pathogens [144,145]. Soil amendment with chitosan has frequently been shown to control Fusarium wilts [90,146,147] and gray molds [97,103] in a number of crops.…”

Section: Chitosan In Crop Production and Protectionmentioning

confidence: 99%

Chitosan nanoparticle based delivery systems for sustainable agriculture

Kashyap

Xiang

Heiden

2015

International Journal of Biological Macromolecules

565

228

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“…Lots of studies showed that chitosan is not only an antimicrobial agent but also an effective elicitor of plant systemic acquired resistance to pathogens (Table 3). Even applied on plants together with the biological control agents, chitosan enhanced the efficacy in the control of pathogens (Vallance et al 2011;Abro et al 2013). It is possible for chitosan as a new type of green pesticides to play an important role in agriculture owing to its nontoxic, biodegradable, and nonpollution characteristics.…”

Section: Elicitation Of Plant Defense Responses By Chitosanmentioning

confidence: 99%

Chitosan antimicrobial and eliciting properties for pest control in agriculture: a review

Xing

Zhu

Peng

et al. 2014

Agron. Sustain. Dev.

279

186

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In agriculture, current control of pathogens relies mainly on chemical fertilizers and pesticides. However, alternative solutions are needed due to concerns for public health, environmental protection, and development of resistant pests. Chitosan is a nontoxic, biodegradable biopolymer showing antimicrobial and plant-immunity eliciting properties. Here, we review chitosan antimicrobial activities, modes of action, and the elicitation of plant defense responses. The major points are the following: (1) Chitosan exhibits various inhibitory efficiency against bacteria, fungi, and viruses;(2) the five main modes of action of chitosan are electrostatic interactions, plasma membrane damage mechanism, chitosan-DNA/RNA interactions, metal chelation capacity of chitosan, and deposition onto the microbial surface; (3) the elicitation of plant defense responses by chitosan may be related to various pathogenesis-related proteins, defense-related enzymes, and secondary metabolites accumulation, as well as the complex signal transduction network. The facing problems and strategies for antimicrobial mechanism research and agricultural application of chitosan are also discussed.

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Pathogenic and beneficial microorganisms in soilless cultures

Cited by 63 publications

References 92 publications

Microbial community dynamics in the recirculating nutrient solution of tomato plug seedlings cultivated under ebb-and-flow system

Microbial community dynamics in the recirculating nutrient solution of tomato plug seedlings cultivated under ebb-and-flow system

Chitosan nanoparticle based delivery systems for sustainable agriculture

Chitosan antimicrobial and eliciting properties for pest control in agriculture: a review

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