Entomopathogenic fungi decrease<i>Rhizoctonia</i>disease in potato in field conditions

Tomilova, Oksana G.; Shaldyaeva, E. M.; Kryukova, Natalia A.; Pilipova, Yulia V.; Schmidt, Natalia S.; Danilov, Viktor Petrovich; Kryukov, V. Yu.; Глупов, В. В.

doi:10.7717/peerj.9895

Cited by 31 publications

(32 citation statements)

References 79 publications

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“…It is important to note that the low level of potato colonization by entomopathogenic fungi under their natural load does not exclude the benefits for plants following the artificial introduction of the fungi into agrosystems. We showed previously [ 14 ] that the pre-planting treatment of tubers with M. robertsii and B. bassiana suspensions (5 × 10 7 conidia/mL) led to successful endophytic colonization of potato roots under field conditions (32–47% fungi-positive plants in the flowering period). Potato growth stimulation, immunity activation, and a decrease in Rhizoctonia diseases were also registered in treated plants.…”

Section: Discussionmentioning

confidence: 99%

“…The authors suggested that M. brunneum may mitigate nutrient deficits in soil by improving plant productivity. We showed in previous work [ 14 ] that treating potato tubers pre-planting with Beauveria bassiana and Metarhizium robertsii conidia led to a decrease in Rhizoctonia disease and stimulation of plant growth under field conditions. Thus, work on the interactions between entomopathogenic fungi and potato plants was conducted either in the laboratory in sterile substrates or under field conditions after introducing the fungi.…”

Section: Introductionmentioning

confidence: 99%

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Can Potato Plants Be Colonized with the Fungi Metarhizium and Beauveria under Their Natural Load in Agrosystems?

et al. 2021

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Beauveria and Metarhizium fungi are facultative plant endophytes that provide plant growth-stimulating, immunomodulatory, and other beneficial effects. However, little is known about the level of plant colonization by these fungi under natural conditions. We assessed the endophytic colonization of potatoes (Solanum tuberosum) with entomopathogenic fungi at their natural load in soils (102–104 colony-forming units per g). Microbiological analyses of soils and plant organs, as well as a metagenomic analysis of potato roots and leaves, were conducted in three locations in Western Siberia, consisting of conventional agrosystems and kitchen gardens. The fungi were isolated at a relatively high frequency from unsterilized roots (up to 53% of Metarhizium-positive plants). However, the fungi were sparsely isolated from the internal tissues of roots, stems, and leaves (3%). Among the genus Metarhizium, two species, M. robertsii and M. brunneum, were detected in plants as well as in soils, and the first species was predominant. A metagenomic analysis of internal potato tissues showed a low relative abundance of Beauveria and Metarhizium (<0.3%), and the communities were represented primarily by phytopathogens. We suggest that colonization of the internal tissues of potatoes occurs sporadically under a natural load of entomopathogenic fungi in soils. The lack of stable colonization of potato plants with Beauveria and Metarhizium may be due to competition with phytopathogens.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Can Potato Plants Be Colonized with the Fungi Metarhizium and Beauveria under Their Natural Load in Agrosystems?

et al. 2021

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“…Strains of Be. Bassiana have also provided potato with protection from Rhizoctonia solani [72] and tomato with protection from Fusarium oxysporum f. sp. lycopersici [73], Rhizoctonia solani and Pythium myriotylum [51].…”

Section: Discussionmentioning

confidence: 99%

Development of Plant–Fungal Endophyte Associations to Suppress Phoma Stem Canker in Brassica

et al. 2021

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Endophytic microorganisms are found within the tissues of many plants species, with some conferring several benefits to the host plant including resistance to plant diseases. In this study, two putative endophytic fungi that were previously isolated from wild seeds of Brassica, identified as Beauveria bassiana and Pseudogymnoascus pannorum, were inoculated into cultivars of three Brassica species—Brassica napus, Br. rapa and Br. oleracea. Both fungal endophytes were reisolated from above- and below-ground tissues of inoculated plants at four different plant-growth stages, including cotyledon, one-leaf, two-leaf, and four-leaf stages. None of the plants colonised by these fungi exhibited any obvious disease symptoms, indicating the formation of novel mutualistic associations. These novel plant–endophyte associations formed between Brassica plants and Be. bassiana significantly inhibited phoma stem canker, a devastating disease of Brassica crops worldwide, caused by the fungal pathogen Leptosphaeria maculans. The novel association formed with P. pannorum significantly suppressed the amount of disease caused by L. maculans in one out of two experiments. Although biological control is not a new strategy, endophytic fungi with both antiinsect and antifungal activity are a highly conceivable, sustainable option to manage pests and diseases of economically important crops.

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“…Rhizoctonia solani Kuhn is the most destructive potato disease, causing stem canker and black scurf (Woodhall et al, 2007;Daami-Remadi, Zammouri & Mahjoub, 2008;Das et al, 2014;Yang et al, 2017). In Western Siberia, the damage caused to potatoes by Rhizoctonia disease can reach 67-70.8% (Tomilova et al, 2020). One of the most common raspberry fungal diseases is spur blight caused by Didymella applanata (Niessl) Sacc.…”

Section: Introductionmentioning

confidence: 99%

Biological control of important fungal diseases of potato and raspberry by two Bacillus velezensis strains

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et al. 2021

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Stem canker and black scurf caused by Rhizoctonia solani are the important diseases in potato, while spur blight caused by Didymella applanata is a major disease in red raspberry. In Western Siberia, both crops are grown predominantly in small-scale farming that requires maximal usage of biological products for plant protection instead of chemicals. We evaluated two promising Bacillus velezensis strains BZR 336 g and BZR 517 isolated in the south of Russia (45°1′N, 38°59′E) for their biological control potentials against the potato and red raspberry diseases under the more severe weather conditions of Western Siberia (55°1′N, 82°55′ E). We tested two techniques to apply biocontrol agents: (1) coating the seeds (potato tubers) and (2) spraying over the plants (raspberry canes). In each case, we estimated B. velezensis strains on two plant cultivars differed by the disease resistance. The degree of B. velezensis influence on disease incidence and severity depended on the bacterial strain, the protected plant, and its cultivar. We also demonstrated that two B. velezensis strains significantly stimulated plant growth of potato, which contributed to the plant productivity on both cultivars. The BZR 336 g strain affected the potato productivity more than the BZR 517 strain. Under the influence of both bacterial strains, raspberry yield was significantly higher compared to the control on the susceptible cultivar. These findings indicated that two southern B. velezensis strains had proved their efficacy as biological control agents in the control of the serious fungal infection of potato and raspberry plants under the more severe ecological conditions of Western Siberia. For the first time, we demonstrated B. velezensis strains potential for use as biological control agents against R. solani on potato, and against D. applanata on red raspberry.

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Entomopathogenic fungi decreaseRhizoctoniadisease in potato in field conditions

Cited by 31 publications

References 79 publications

Can Potato Plants Be Colonized with the Fungi Metarhizium and Beauveria under Their Natural Load in Agrosystems?

Can Potato Plants Be Colonized with the Fungi Metarhizium and Beauveria under Their Natural Load in Agrosystems?

Development of Plant–Fungal Endophyte Associations to Suppress Phoma Stem Canker in Brassica

Biological control of important fungal diseases of potato and raspberry by two Bacillus velezensis strains

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