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161 results on '"Suárez-Estrella, F."'

31. Application of sonicated extracts of cyanobacteria and microalgae for the mitigation of bacterial canker in tomato seedlings

Author

Toribio, A. J. Jurado, M. M. Suárez-Estrella, F. López-González, J. A. Martínez-Gallardo, M. R. López, M. J.

Subjects
food and beverages
Abstract

Microalgae and cyanobacteria could play an important role in crop protection, since they produce bioactive substances that promote plant growth and/or trigger the plant resistance mechanisms. The present study focuses on the control of bacterial canker caused by Clavibacter michiganensis subsp. michiganensis on tomato plants by using sonicated extracts from cyanobacteria and microalgae of the genera Leptolyngbya, Nostoc, Chlorella, and Scenedesmus. For the development of this study, 8 strains were firstly tested for their capacity to inhibit the growth of C. michiganensis subsp. michiganensis in vitro, as well as to produce cytokinins and salicylic acid. In order to discard those more phytotoxic strains, the germination index was also estimated in watercress seeds. Scenedesmus-677 and Leptolyngbya-1267 strains were selected in this first phase based on their pesticide and phytostimulant capacity in vitro. Subsequent bioassays on tomato seedlings showed that root application of Scenedesmus-677 could be more aimed at controlling the disease caused by C. michiganensis subsp. michiganensis, while foliar and root application of Leptolyngbya-1267 seems to be more related to the strengthening of the plant through the salicylic acid route. These preliminary results could serve as the basis for a deeper characterization of the biopesticidal and biostimulant effect of both strains, as well as to reveal the benefits derived from the combination of both capacities.

Published
2021

49. Temperature effect on Fusarium oxysporum f.sp.melonis survival during horticultural waste composting.

Author

Suárez-Estrella, F., Vargas-García, M.C., Elorrieta, M.A., López, M.J., and Moreno, J.

Subjects
*EFFECT of temperature on microorganisms, *COMPOSTING, *FUSARIUM oxysporum, *HORTICULTURE
Abstract

Aims: The aim of this work was to study the effect of high temperatures generated during composting process, on the phytopathogen fungus Fusarium oxysporum f. sp. melonis. This investigation was achieved by both in vivo (semipilot-scale composting of horticultural wastes) and in vitro (lab-scale thermal treatments) assays. Methods and Results: Vegetable residues infected with F. oxysporum f. sp. melonis were included in compost piles. Studies were conducted in several compost windrows subjected to different treatments. Results showed an effective suppression of persistence and infective capacity, as this process caused complete fungal elimination after 2-3 days of composting. In order to confirm the effect of high temperature during this process, in vitro experiments were carried out. Temperature values of 45, 55 and 65°C were tested. All three treatments caused the elimination of fungal persistence. Treatment at 65°C was especially effective, whereas 45°C eliminated fungal persistence only after 10 days. Conclusions: The composting process is an excellent alternative for the management of plant wastes after harvesting, as this procedure is able to suppress infective capacity of several harmful phytopathogens such as F. oxysporum f.sp. melonis. Significance and Impact of the Study: Fusarium oxysporum f.sp. melonis is a plant pathogen fungus specially important in the province of Almería (south-east Spain), where intensive greenhouse horticulture is very extended. High temperatures reached during composting of horticultural plant wastes ensure the elimination of phytopathogen microorganisms such as F. oxysporum f.sp. melonis from vegetable material, providing an adequate hygienic quality in composts obtained. [ABSTRACT FROM AUTHOR]

Published
2003
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