Comportamento de população melhorada de coentro quanto a reação de resistência à Meloidogyne incognita raça 1

Abstract

There is no genetic studies in the culture of cilantro to identify genotypes resistant to diseases. Cultivar Verdão is the most used by the farmers of the North and Northeast of Brazil, however, is a good host of Meloidogyne incognita. An alternative for population control of this pathogen in the soil is the use of resistant cultivars, by providing reduced nematode inoculum and spread to other areas. The study of correlations is an option that allows a better understanding of the genetic control of the trait in the breeding population, which allows greater efficiency in the selection. The objective of the study was to evaluate a population of coriander as resistance to Meloidogyne incognita race 1 and propose a strategy for driving improvement coriander program to obtain resistant genotypes. 46 half-sib progenies were evaluated in randomized blocks, with three replications, and the experimental plot consisted of eight plants. After fifteen days of sowing the inoculation of eggs in 1500 the pathogen was performed with plants harvested forty-five days after inoculation. The variables evaluated were number of galls in clod, number of root galls washed and the number of eggs per plant. There was no significant difference between the progenies. There was positive genetic correlation between characters in clod number of galls and egg number. The coincidence of individuals with fewer galls in clod and eggs was approximately 50%. Considering the study population, 51.97% of the plants showed lower number of galls on the root ball truncation point set and 55.38% endorsed the guys are tough.