Seleção indireta em genótipos de tomateiro para tolerância ao estresse hídrico

Abstract

The objective was to define an efficient method of indirect selection for tolerance to water stress and use it as a screening method in tomato genotypes F2RC1. The experiments were conducted at the Seed Analysis Laboratory and Genetic Resources and the Experimental Station of vegetables, the Federal University of Uberlândia in Monte Carmelo. At first it was assessed how best concentration of Mannitol able to identify two genotypes (wild access LA-716, Solanum pennellii and cv Santa Clara) known to be tolerant and susceptible to water stress, respectively. The potential level of -0.3 MPa osmotic obtained from the use of 22.29 g L-1 Mannitol presented selection efficiency. This methodology was used for selection in seven F2RC1 families, wild accession Solanum pennellii and cv Santa Clara. Was used a completely randomized design. The data were submitted to normality test (Lilliefors test). To compare means, we used the Tukey test at a significance level of 5% probability (p <0.05). Orthogonal contrasts of interest were performed comparing each group for each characteristic evaluated using the Scheffé test (α = 0.05 and 0.01). The family UFU80- F2RC1 # 1 differed statistically in relation to check susceptible to water stress.