THE RESISTANCE RESPONSE OF <I>SOLANUM HUAYLASENSE</I> ACCESSION LA1358 TO <I>MELOIDOGYNE</I> SPP.

Abstract

Cortada, L., P. Manzano, F. J. Sorribas, C. Ornat, and S. Verdejo-Lucas. 2010. The resistance response of Solanum huaylasense accession LA1358 to Meloidogyne spp. Nematropica 40:31-40. Pathogenicity tests were performed to determine resistance in the wild tomato Solanum huaylasense to four populations of Meloidogyne spp. The S. huaylasense accession LA1358, the root-knot nematode resistant tomato cultivar 'Anairis' and the susceptible tomato cultivar 'Bodar' were assessed against three Mi-avirulent populations of either Meloidogyne arenaria, M. incognita or M. javanica, and to one naturally Mi-virulent population of M. javanica. The relationship between the final and initial population, calculated as the number of eggs per plant (final population) divided by the initial juvenile inoculum, was used as the dependent variable to determine variability in the reproduction of the four Meloidogyne populations tested. Reproduction of M. arenaria was similar on S. huaylasense accession LA1358 and cultivar 'Anairis'. Reproduction of M. incognita on accession LA1358 did not differ statistically from the resistant or susceptible tomato cultivars. Reproduction of the Mi-avirulent population of M. javanica on accession LA1358 did not differ from the susceptible cultivar 'Bodar', and the Mi-virulent M. javanica population reproduced similarly on accession LA1358 and both cultivars. This is the first report on a nematode-species specific resistance in the newly described species of S. huaylasense. Identification of novel root-knot nematode resistance genes in wild Solanum species is the first step for the deployment of new resistance genes in tomato cultivars to preserve durability of plant resistance to root-knot nematodes.