Resistência do coentro (Coriandrum sativum L.) à Meloidogyne incognita (raças 1 e 3) e Meloidogyne javanica

Abstract

The cultivation of coriander is being attacked by nematodes are needed to work with existing genetic variability obtaining cultivars resistant reducing losses caused by this pathogen. The objective of this study was to estimate genetic parameters of resistance to coriander and characterization of six cultivars depending on the reaction to M. incognita (races 1 and 3) and M. javanica. The experiment was conducted in a greenhouse on the premises of HortiAgro® Seeds Ltda. In the municipality of Ijaci, located in southern Minas Gerais State, during the period October to December 2011. We evaluated six cultivars of coriander in randomized complete block design with six replications and 16 plants per plot were used inocula of M. incognita race 1, M. incognita race 3 and M. javanica whose eggs were added to the substrate trays in a proportion of 1.200 eggs. ml-1 solution. With the data obtained, we carried out analyzes of variance and the variances were also estimated phenotypic, genetic and environmental, the broad-sense heritability at the level of the cultivar means, the coefficient of genetic variation, the ratio between the coefficients of genetic variation and environmental variation for the characteristics: incidence of galls, number of galls, number of egg mass and egg number. Regarding the characterization of the cultivars were evaluated characteristics: number of egg mass, number of eggs, reproductive factors and index playback. The results indicate that there is genetic variability within and among cultivars and, based on multiplication of nematode, the coriander cultivars showed resistant reaction to M. incognita race 3 and M. javanica. The characteristics, number of egg masses and the number of eggs can be used for the evaluation of higher levels of resistance. The cultivars showed variability within families for resistance to nematode galls, which may be used in breeding programs aimed at developing cultivars resistant to Meloidogyne spp.