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Article

Plant Growth Promotion and Biocontrol of Pythium ultimum by Saline Tolerant Trichoderma Isolates under Salinity Stress

1
Departamento de Agronomía, Escuela Superior de Ingeniería, Universidad de Almería, 04120 Almería, Spain
2
Centro de Investigación, Experimentación y Servicios del Champiñón (CIES), Quintanar del Rey, 16220 Cuenca, Spain
*
Author to whom correspondence should be addressed.
Int. J. Environ. Res. Public Health 2019, 16(11), 2053; https://0-doi-org.brum.beds.ac.uk/10.3390/ijerph16112053
Received: 15 May 2019 / Revised: 3 June 2019 / Accepted: 4 June 2019 / Published: 10 June 2019
(This article belongs to the Special Issue Greenhouse and Horticulture)
This present study evaluates three isolates of Trichoderma as plant growth promoting or biological control agents: Trichoderma aggressivum f. sp. europaeum, Trichoderma saturnisporum, and the marine isolate obtained from Posidonia oceanica, Trichoderma longibrachiatum. The purpose is to contribute to an overall reduction in pesticide residues in the fruit and the environment and to a decrease in chemical fertilizers, the excess of which aggravates one of the most serious abiotic stresses, salinity. The tolerance of the different isolates to increasing concentrations of sodium chloride was evaluated in vitro, as well as their antagonistic capacity against Pythium ultimum. The plant growth promoting capacity and effects of Trichoderma strains on the severity of P. ultimum on melon seedlings under saline conditions were also analysed. The results reveal that the three isolates of Trichoderma, regardless of their origin, alleviate the stress produced by salinity, resulting in larger plants with an air-dry weight percentage above 80% in saline stress conditions for T. longibrachiatum, or an increase in root-dry weight close to 50% when T. aggressivum f. sp. europaeum was applied. Likewise, the three isolates showed antagonistic activity against P. ultimum, reducing the incidence of the disease, with the highest response found for T. longibrachiatum. Biological control of P. ultimum by T. aggressivum f. sp. europaeum and T. saturnisporum is reported for the first time, reducing disease severity by 62.96% and 51.85%, respectively. This is the first description of T. aggressivum f. sp. europaeum as a biological control agent and growth promoter. The application of these isolates can be of enormous benefit to horticultural crops, in both seedbeds and greenhouses. View Full-Text
Keywords: Pythium ultimum; salt tolerance; Trichoderma; biological control; stress abiotic and biotic Pythium ultimum; salt tolerance; Trichoderma; biological control; stress abiotic and biotic
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MDPI and ACS Style

Sánchez-Montesinos, B.; Diánez, F.; Moreno-Gavira, A.; Gea, F.J.; Santos, M. Plant Growth Promotion and Biocontrol of Pythium ultimum by Saline Tolerant Trichoderma Isolates under Salinity Stress. Int. J. Environ. Res. Public Health 2019, 16, 2053. https://0-doi-org.brum.beds.ac.uk/10.3390/ijerph16112053

AMA Style

Sánchez-Montesinos B, Diánez F, Moreno-Gavira A, Gea FJ, Santos M. Plant Growth Promotion and Biocontrol of Pythium ultimum by Saline Tolerant Trichoderma Isolates under Salinity Stress. International Journal of Environmental Research and Public Health. 2019; 16(11):2053. https://0-doi-org.brum.beds.ac.uk/10.3390/ijerph16112053

Chicago/Turabian Style

Sánchez-Montesinos, Brenda, Fernando Diánez, Alejandro Moreno-Gavira, Francisco J. Gea, and Mila Santos. 2019. "Plant Growth Promotion and Biocontrol of Pythium ultimum by Saline Tolerant Trichoderma Isolates under Salinity Stress" International Journal of Environmental Research and Public Health 16, no. 11: 2053. https://0-doi-org.brum.beds.ac.uk/10.3390/ijerph16112053

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