Article Number: DRJBB21329074
Vol. 7, Pp. 37-46, 2021
Copyright © 2021
Author(s) retain the copyright of this article
Mechanisms of disease resistance to late blight disease of potato
Potato (Solanum tuberosum L.) is a very important crop grown worldwide. Its production and yield is affected by many pests and diseases among which the late blight caused by the fungus Phytophthora infestans (Mont.) De Bary is the most devastating. The disease affects the stem, leaves and tubers of the crop. Potato late blight may be controlled by several approaches including host resistance. Unfortunately, efforts till date using host resistance have led to limited successes as pathogen populations have evolved rapidly to over-come resistance or durably resistant varieties have had limited adoption. Therefore, applying fungicides frequently has been the most common control measure employed globally. However, these fungicides are expensive and long-term use has adverse effects on the environment, human health and livestock. A review was carried out on the mechanisms of disease resistance to late blight disease of potato. At the end of the review, it was gathered that several problems hinder the diffusion of resistant cultivars, including a rapidly evolving pathogen population, market preferences, association of resistance with late maturation, and methodological issues such as inaccurate phenotyping and insufficient communication among researchers. New technologies and approaches that improve the identification and adoption of resistant varieties are discussed, including biotechnology, enhanced conventional breeding, pathogen monitoring, improved phenotyping, and better research collaboration.
Keywords: Potato, host resistance, pathogen population, late blight disease