Controle genético da resistência à Meloidogyne incognita nas cultivares de alface grand rapids e salinas 88

Abstract

The aim of this work was to study the genetic control the resistance to Meloidogyne incognita race 1 of the cultivars lettuce 'Grand Rapids' and 'Salinas 88'. Two experiments were accomplished. The first ‘Grand Rapids’, ‘Salinas 88’, ‘Regina 71’, F1 (‘Grand Rapids’ x ‘Salinas 88’), F2 (‘Grand Rapids’ x ‘Salinas 88’), F3 (‘Grand Rapids’ x ‘Salinas 88’) and F4 progenies (‘Grand Rapids’ x ‘Salinas 88’) were used. The second ‘Grand Rapids’, ‘Salinas 88’, ‘Regina 71’ and F4 progenies were used. The substrate was infested with substrate 30 eggs of Meloidogyne incognita race 1.cm- 3 of substrate. The evaluation was made 45 days for the incidence of galls, score for number of galls, score for number of egg-masses and number of eggs, for root system. Different genes are involved in the genetic control of the resistance to Meloidogyne incognita race 1 in 'Grand Rapids' and 'Salinas 88' and high and positive genetic correlation there was among all of the appraised characters and the number of eggs is the best character to select resistant plants.