Testing various biocontrol agents against the root-knot nematode (Meloidogyne incognita) in cucumber plants identifies a combination of Syncephalastrum racemosum and Paecilomyces lilacinus as being most effective

Huang, Wenkun; Cui, Jin; Liu, Shiming; Kong, Lingan; Wu, Qingsong; Peng, Huan; He, Wei; Sun, Jinsheng; Peng, Deliang

doi:10.1016/j.biocontrol.2015.09.008

Cited by 64 publications

(34 citation statements)

References 20 publications

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“…Nevertheless, P. variotii was selected given the sparse literature on this species as a plant-growth promoter. The ability of P. variotii to stimulate plant growth is poorly studied, while for other species of the same genus, the growth-promoting effect is generally associated with an improvement in the plant status for its nematicide effect for the control of diseases caused by different nematode species [48].…”

Section: Discussionmentioning

confidence: 99%

Paecilomyces variotii as A Plant-Growth Promoter in Horticulture

et al. 2020

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In the present study, P. variotii, an endophytic fungus isolated from plant roots from the Cabo de Gata Natural Park (Parque Nacional Cabo de Gata—Spain), was tested to determine the effect on the growth promotion of tomato and pepper seeds and seedlings. For these purposes, germination trials in a laboratory and two experiments in a commercial nursery and greenhouse conditions were performed. The P. variotii isolate has shown a high ability to produce siderophores and IAA, but low ability to solubilize P. High values for germination percentage, seedling vigor, root and shoot length were obtained by P. variotii on tomato and pepper against control. P. variotii applications resulted in improved most of the growth parameters evaluated, for both horticultural crops, with the best results in the development of pepper seedlings. The application of a higher dose of P. variotii improved most of the morphological parameters and the Dickson quality index (DQI) value in tomato in seedlings and plants. The establishment of the endophytic fungus at the root enabled its biostimulant effects to persist after transplantation without any additional application. Few studies have analyzed this species as a biostimulant. The positive results from the tests showed its high potential. The application of this isolate can be of enormous benefit to horticultural crops for its high reproductive and establishment capacity.

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Section: Discussionmentioning

confidence: 99%

Paecilomyces variotii as A Plant-Growth Promoter in Horticulture

et al. 2020

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“…Among all the biological pesticides, biocontrol bacteria or their metabolites are used to control plant diseases, and the work principle is to balance the beneficial and harmful microorganisms around host plants, so as to achieve the purpose of disease prevention and yield increase [30][31][32]. Bacterial species that have been extensively studied as biocontrol agents belong to the genera Bacillus, Burkholderia, Collimonas and Pseudomonas [33][34][35] and promote plant growth through a variety of mechanisms [36,37].…”

Section: Effects Of the Microbial Agents On The Disease Status Of Vermentioning

confidence: 99%

Mixed bacterial fermentation can control the growth and development of Verticillium dahliae

Cheng

Guo

Peng

et al. 2020

Biotechnology & Biotechnological Equipment

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Verticillium wilt is a severe disease caused by Verticillium dahliae, which afflicts many crops, particularly cotton in the Xinjiang province of China. Chemical fungicides are harmful to the environment, and biological control agents against the fungal pathogens of plants provide an alternative to chemicals. Biological control agents include antagonistic bacteria or metabolic products. We investigated the inhibitory effects of two plant-growth-promoting rhizobacterial (PGPR) strains, namely Bacillus tequilensis C-9 and Sphingobacterium A1, against V. dahliae in vitro and in the field. We used the mixed fermentation of two bacteria to inhibit V. dahliae. Antimicrobial assays were performed and showed that spore production and germination, and the virulence protein of V. dahliae were reduced after treatment with cell-free mixed fermentation broth. In field studies, there was improvement in the disease severity, along with declined incidence and index after the treatment in the bud and bell stages. To explore the molecular mechanisms of this inhibition, we studied six metabolism-related genes by real-time quantitative polymerase chain reaction (qRT-PCR). The results showed that in response to mixed fermentation broth, some genes related to growth and development were significantly upregulated, explaining the structural changes observed in V. dahliae. Some genes that regulate oxidative stress were also dramatically induced, indicating that mixed bacterial fermentation had a significant impact on V. dahliae. These results support the idea that the cell-free mixed fermentation broth of Bacillus tequilensis C-9 and Sphingobacterium A1, when applied for biocontrols, can inhibit V. dahliae in vitro and in vivo.Abbreviations: ANOVA: analysis of variance; BE: biocontrol efficacy (%); CFU: colony-forming unit; DI: disease incidence rates (DI %); DS: disease status; PDA: potato dextrose agar; PDB: potato dextrose broth (liquid medium); PGPR: plant-growth-promoting rhizobacteria ARTICLE HISTORY

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“…Traditionally, the main control technique involves the use of chemical nematicides; however, the negative consequences of these products to the environment and their inefficiency after long-term use have resulted in the prohibition or restrictions on various molecules employed. Therefore, there is an increasing requirement for developing non-chemical alternative methods for the management of the root-knot nematode (HUANG et al, 2016).…”

Section: Introductionmentioning

confidence: 99%

Biocontrol agents in the management of Meloidogyne incognita in tomato

et al. 2017

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Recognized as prominent among the principal pests of tomato crop, the root-knot nematode (Meloidogyne incognita) has generated much study with regards to control methods. This study aimed to assess the efficiency of biological products in decreasing the M. incognita population in tomato. Four experiments were conducted under greenhouse conditions. Two of these experiments had the purpose to determine the efficiency of NemOut™ (Bacillus subtilis + B. licheniformis + Trichoderma longibrachiatum), and the other two to assess the efficiency of other different biological products in M. incognita management. Tomato plants of the cultivar Santa Cruz Kada Giant were inoculated using 2000 eggs and J2 of M. incognita. In the first two experiments doses corresponding to 0, 4, 6, 8 and 10kg ha-1 of NemOut™ were applied after inoculation. In the second study, the treatments consisted of the use of biological products containing different other biocontrol agents. Assessments were made at 45 and 65 days after inoculation (DAI) to evaluate plant height, fresh shoot and fresh root weigh, gall index and egg mass index, population density and reproduction factor (RF). The NemOut™ doses reduced the M. incognita population density and RF at 45 DAI. The agent Pochonia chlamydosporia showed greater efficiency in controlling M. incognita on tomato. Biological products and the different doses of NemOut™ had no influence on the tomato plant development.

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Testing various biocontrol agents against the root-knot nematode (Meloidogyne incognita) in cucumber plants identifies a combination of Syncephalastrum racemosum and Paecilomyces lilacinus as being most effective

Cited by 64 publications

References 20 publications

Paecilomyces variotii as A Plant-Growth Promoter in Horticulture

Paecilomyces variotii as A Plant-Growth Promoter in Horticulture

Mixed bacterial fermentation can control the growth and development of Verticillium dahliae

Biocontrol agents in the management of Meloidogyne incognita in tomato

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