Could the Supply of Boron and Zinc Improve Resistance of Potato to Early Blight?

Autor: Patrícia Pereira Machado, Fábio Steiner, Alan Mario Zuffo, Rafael Alves Machado
Rok vydání: 2018
Předmět:
Zdroj: Potato Research. 61:169-182
ISSN: 1871-4528
0014-3065
DOI: 10.1007/s11540-018-9365-4
Popis: The adequate supply of boron (B) and zinc (Zn) can improve the structural integrity and permeability of cell membranes, which is a defence mechanism against fungi infection. A greenhouse experiment was conducted to investigate the effect of the application of B and Zn on plant growth and the incidence and severity of potato early blight, a destructive foliar disease of potato crop caused by Alternaria grandis E.G. Simmons. Potato plants (Solanum tuberosum L. cv. Agata) were grown in 11-l pots filled with sandy soil, unfertilized or fertilized with 5 mg kg−1 B and 5 mg kg−1 Zn (either alone or in combination). Potato plants were inoculated with isolates of Alternaria grandis at 40 days after planting. Early blight incidence and severity were evaluated visually 7 days after inoculation with A. grandis isolates. Disease incidence ranged from 16 to 41% infected leaves, and was significantly highest in the treatment with the application of B, followed by the control, and lowest with application of Zn and B + Zn. Early blight severity ranged from 2.5 to 25%, and was significantly higher in the unfertilized treatment than in those fertilized with Zn either alone or in combination with B. These findings suggest that Zn plays a critical role in potato tolerance to early blight and should be considered as a preventive measure in the disease management plan, since application of zinc reduced the incidence and severity of potato early blight. However, the physiological basis of this remains unknown.
Databáze: OpenAIRE
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