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Development and selection of F2RC3 tomato genotypes tolerant to abyotic stresses

Abstract

The negative effects of abiotic factors on tomato are difficult to control, which leads to the need to search for genetic tolerance to stabilize fruit production in regions subject to stress. Based on this, the objective is to develop and select genotypes with characteristics for fresh consumption and processing tolerant to abiotic stresses through interspecific crosses of tomato Solanum lycopersicum (Santa Clara I-5300 and BRS Tospodoro strains, with characteristics for fresh consumption and processing, respectively) with the wild species S. pennelli access LA-716 and S. habrochaites var. hirsutum access PI-127826, with subsequent three backcrosses for S. lycopersicum. The project will consist of three subprojects: subprojects 1 and 2 - development and selection of tomato plants tolerant to water deficit and salinity, in which the genetic resource tolerant to severe water stress and salinity is the species S. pennellii access LA-716; and subproject 3 - development and selection of tomato plants tolerant to high temperatures, in which the genetic resource tolerant to high air temperatures is the wild species S. habrochaites access PI-127826. The experiments will be conducted at the Centro de Estudos em Olericultura e Fruticultura do Oeste Paulista, Universidade do Oeste Paulista - Unoeste, Campus II, in Presidente Prudente-SP. To obtain genotypes with commercial standard and tolerant to abiotic stresses, in each odd backcross a self-fertilization and a progeny test will be carried out to select the genotypes with the desired characteristics. Screenings and selections will be carried out based on physiological and agronomic characteristics. The works proposed in this project are expected to enable the cultivation of tomato to be carried out in regions/times with less water availability, occurrence of salinity and high air temperatures. The development and selection of genotypes of the third backcross (F2RC3) with characteristics for fresh consumption and for processing tolerant to abiotic stresses will constitute an important technological advance for tomato cultivation in the Midwest of São Paulo and other regions of Brazil. (AU)

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