Reação de acessos de melão caxi à Meloidogyne enterolobii e Meloidogyne javanica

Abstract

In Brazil, the snapmelons of momordica botanical group are known in different regions of the country such as melon caxi, meloite, melon papoco and snow melon. There are few reports in the literature with snapmelons, requiring studies aimed at understanding the genetic variability. This study aimed to evaluate the melon caxi access reactions the Meloidogyne enterolobii and M. javanica, and then select the promising genotypes for the crop breeding program for resistance to root knot nematode UFRPE. The isolated M. enterolobii e M. javania they was kept in pure wing vegetation and multiplied in susceptible tomato plants. The extraction of the eggs was performed according to the technique proposed by Hussey &Barker (1973) and modified by Bonetti & Ferraz (1981). The experiments carried out in a randomized block design were conducted in the period February to April 2015, and from October to December of the same year. These experiments were conducted in a protected environment with the sowing of accesses made in PVC tubes containing commercial substrate Basaplant®. Infestation was performed of each species separately in egg suspension ratio of 3000 eggs.tubete-1. 45 days after the infestation of the seedlings, we proceeded to the evaluation of the hits, where the roots were washed for counting the number of galls per root system. After counting galls, the eggs were extracted from the roots of melon plants by technical Hussey and Barker (1973), modified by Boneti and Ferraz (1981). The thus obtained eggs were counted using a stereomicroscope, obtaining the number of eggs per root system. The reproduction factor: FR ≥ 1 indicate good host, FR <1.0 poor host and FR = 0 host not based on the classification proposed by Oostenbrink (1966). All tested accessions showed FR> 1 proved to be good hosts for M. enterolobii and M. javania.