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

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.

IX International Symposium on Timing of Field Production in Vegetable Crops

G.V.G. Grilli, L.T. Braz, D. Perecin, J.A. Oliveira

Lycopersicon esculentum, heritability, mean degree of dominance, number of genes, plant breeding.

https://doi.org/10.17660/ActaHortic.2003.607.27