Effect of spray with autochthonous Trichoderma strains and its secondary metabolites on the quality of Tempranillo grape
Trichoderma is one of the most widely used fungal biocontrol agents on vineyards due to its multiple benefits on this crop, such as its fungicidal and growth promoting capacity. In this work, we have analyzed the effect on the concentration of nutrients in grapevine leaves and on the quality of the grape must after spraying an autochthonous strain of Trichoderma harzianum and one of the main secondary metabolites produced by this genus, 6-pentyl-α-pyrone (6PP).
The trials were carried out in two regular vine plantations (Vitis vinifera cv. Tempranillo). The experimental design was in randomized blocks with three treatments (Trichoderma harzianum autochthonous strain, 6PP and control) and 10 repetitions (plants) per block. A total of 6 applications of treatments were made on the entire vegetative part of the plant every 15 days. During the development of the test, levels of potassium, calcium and magnesium were measured in the vine leaves and must quality parameters were analyzed at the time of harvest.
The nutrient data showed an increase in the concentration of potassium in leaves in the treatment with the autochthonous Trichoderma harzianum strain compared to the other two treatments. In the case of the analysis of the quality of the grapes, an increase in the concentrations of malic acid, total acidity, potassium, probable º and density of the must was also observed in the treatment with the autochthonous Trichodermacompared to the rest of the treatments.
Thanks to the Ministry of Education, Culture and Sports (Spain) for the grant awarded to Laura Zanfaño González (FPU 20/03040), to the own research program of the University of León 2022 for the grant awarded to Daniela Ramírez Lozano. As well as the project acronym LOWPHWINE, reference IDI-20210391.
Issue: ICGWS 2023
1Grupo de Investigación de Ingeniería y Agricultura Sostenible (GUIIAS). Instituto de Medio Ambiente, Recursos Naturales y Biodiversidad, Universidad de León Av. Portugal 41, 24071 León, España.
2Grupo Universitario de Investigación en Ingeniería y Agricultura Sostenible (GUIIAS). Área de Microbiología. Escuela de Ingeniería Agraria y Forestal. Campus de Ponferrada. Universidad de León. León. España.