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Title: Resistência em genótipos segregantes de Psidium guajava L. à Meloidogyne enterolobii
Other Titles: Resistance in segregating genotypes of psidium guajava L. to meloidogyne enterolobii
Authors: Vieira, Alessandra Abreu Rodrigues
Keywords: Meloidogynose;Variabilidade genética;Goiabeira;Meloidogyne mayaguensis;Meloidogynose;Genetic variability;Guava tree;Meloidogyne mayaguensis
Issue Date: 8-Aug-2011
Publisher: Universidade Federal do Espírito Santo
Citation: VIEIRA, Alessandra Abreu Rodrigues. Resistance in segregating genotypes of psidium guajava L. to meloidogyne enterolobii. 2011. 64 f. Dissertação (Mestrado em Fitotecnica; Recursos Florestais) - Universidade Federal do Espírito Santo, Alegre, 2011.
Abstract: In this work, it was evaluated the resistance of the guava tree Psidium guajava L. to Meloidogyne enterolobii (syn. M. mayaguensis) in green house conditions. Were studied 16 segregating genotypes of spontaneous occurrence collected in the cities of Alegre (ES) and Caparaó (MG). The experiment was conducted in completely randomized design (CRD), following the factorial scheme with 16 genotypes x 3 concentrations (500, 2.000 e 4.000 eggs + J2 of Me) and 6 repetitions. The genotypes were constituted of plants from fruits collected in mother plants native of the region. The seeds were removed of these fruits, sown and the plants originated from each genotype were inoculated with six months old in different concentrations of inoculum. It was evaluated the plants height (ALT) at 90 days after inoculation and at 135 were realized the analysis of fresh weight of root (MFR), number of galls (NG), and final population (PF) of the nematode. The classification of progenies for resistance was carried out by the criteria proposed by Oostenbrink (1966) and Moura and Regis (1987), both based on the reproduction factor (FR). Data were submitted to the analysis of variance and the means compared by the Scott and Knott test in 5% of probability. The genotypes 5, 6 and 7 had mean values for FR<1 by the Oostenbrink (1966) classification, as well as within the families were found individuals with values of FR<1. Were found in the progenies of the genotypes 1, 4, 9, 10, 12, 13 and 14 values of FR<1, what showed the segregation of genes to resistance in progenies of mother plants susceptibles. In the genotypes 2, 3, 8, 11, 15 and 16, all the progenies had FR>1, being considered susceptible in accord with the criteria of Oostenbrink (1966) and some progenies with moderate resistance in accord with Moura e Régis (1987). These results allowed infer about the existence of resistance genes in P. guajava to M. enterolobii. There was little variation within the progenies of the genotypes 2, 4, 5, 6, 7, 9, 10, 12 and 16 for the variables MFR, NG, and PF, on the level of 500 eggs + J2 of M. enterolobii, which are always within the same group averages that do not differ from each other, indicating greater homogeneity of these genotypes for reaction to the nematode. The genotype 15 showed low values of MFR and high values of NG and PF in the three concentrations of inoculum, what indicated a trend of this genotype to the parasitism and reproduction of M. enterolobii
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