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ISHS Acta Horticulturae 607: IX International Symposium on Timing of Field Production in Vegetable Crops

GENETIC CONTROL OF FRUIT-SETTING PERCENTAGE OF TOMATOES TOLERANT TO HIGH TEMPERATURES

Authors:   G.V.G. Grilli, L.T. Braz, D. Perecin, J.A. Oliveira
Keywords:   Lycopersicon esculentum, heritability, mean degree of dominance, number of genes, plant breeding.
Abstract:
The aim of present work was to study, through means and variances of generations, the genetic control of fruit-set percentage in tomatoes, in a biparental cross between line Jab-95 (resistant to fruit-set) and ‘Caribe’ cultivar (susceptible to fruit-set) after being subjected to high temperatures. F1, F2, and backcross generations for both parents (P1, P2) were produced in a greenhouse at FCAV-UNESP, Jaboticabal-SP, Brazil. A randomized complete block experimental design with four replications was used to evaluate the different generations. Estimates of genetic parameters were obtained according to Mather and Jinks (1982). An additive-dominant model was fitted to explain the variation observed. The mean degree of dominance (0.54), indicated incomplete dominance in the direction of increasing fruit-set percentage at high temperatures. The genetic control of fruit-set percentage, at high temperatures, for tomato was found to be oligogenic or polygenic (3.54 genes). The heritability in a limited sense was 83.91%, suggesting that the selection of individuals based on the characteristic evaluated can be efficient.
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