Histopathology of Andean Potato parasitadas pelo falso nematoide das galhas, Nacobbus aberrans

• Published in: Brazilian journal of biology 2018-11, Vol.78 (4), p.679
• Main Authors: del C. Tordable, M, Andrade, A.J, Doucet, M.E, Lax, P
• Format: Article
• Language: English
• ISSN: 1519-6984
• DOI: 10.1590/1519-6984.172401

Landraces of the Solanum tuberosum Andigenum group are abundant and diverse. They are a valuable genetic resource possessing resistance to pests, diseases, and environmental stresses. In the Andean region, populations of the false root-knot nematode Nacobbus aberrans became specialized to infect native potatoes, being one of the major limiting factors affecting this crop. A better understanding of the host plant-parasite interactions is important in order to select tolerant or resistant plants to be included in management programs. Despite the close of association of N. aberrans with potato, and the great diversity of the S. tuberosum Andigenum group, few histopathological studies have been conducted. The aim of this work was to analyze histological alterations induced by different Argentine populations of the nematode in naturally infested roots of four Andean potato varieties (Collareja, Negra Imilla, Ojo de Senorita and Colorada). All the varieties showed hyperplastic tissue in the central zone of galls, where syncytia developed in close association with the nematode female. Syncytia were composed of modified hyperplastic tissue and parenchyma xylem cells. The results showed differences among varieties in their response to nematode populations, with Ojo de Senorita and Negra Imilla being the most susceptible ones. This study is the first describing histopathological alterations induced by N. aberrans in susceptible Andean potato landraces. Keywords: Argentina, histopathological alterations, plant-parasitic nematode, potato, syncytia. As variedades de Solanum tuberosum grupo Andigenum sao abundantes e diversas, alem de serem uma fonte importante de recursos geneticos antea resistencia de pragas, doencas e estresse ambiental. Na regiao andina, populacoes de Nacobbus aberrans se especializaram em parasitar batatas nativas e representam o principal fator limitante que afeta a producao desse cultivo. Um melhor entendimento da interacao hospedeiro-parasita e importante para a selecao de plantas tolerantes ou resistentes a serem incluidas nos programas de manejo. Apesar da intima associacao de N. aberrans com a batata e a grande diversidade de S. tuberosum grupo Andigenum, os estudos histopatologicos desenvolvidos sao limitados. O objetivo do presente trabalho foi analisar as alteracoes histologicas de raizes de quatro variedades de batata andina (Collareja, Negra Imilla, Ojo de Senorita e Colorada) parasitadas naturalmente por distintas populacoes argentinas