Abstract
Abstract: The objective of this work was to evaluate the effects of the mutant alleles alcobaça (nor A ), ripening inhibitor (rin), and old gold crimson (og c ), in heterozygosity or homozygosity, on the expression of color and on the postharvest quality of fruit of experimental tomato hybrids. Fourteen hybrids with contrasting genotypic constitutions in the nor A , rin, and og c loci were evaluated in a randomized complete block design with four replicates. The following fruit postharvest quality traits were evaluated: firmness in the breaker stage, color, and soluble solids content. The rin +/rin and nor +/nor A genotypes increased firmness of tomato fruit at harvest (breaker stage). The rin + /rin genotypes displayed the worse internal fruit color. There was a positive effect of og c+ /og c in improving the internal color of rin + /rin and nor + /nor A fruit, making the color similar to that of the normal genotypes. The combination of the og c /og c rin + /rin nor + /nor A genes is effective to improve tomato fruit firmness, besides maintaining or improving internal color.
Highlights
Tomato (Solanum lycopersicum L.) is one of the most highly consumed vegetable crops in the world
The objective of this work was to evaluate the effects of the mutant alleles alcobaça, ripening inhibitor, and old gold crimson, in heterozygosity or homozygosity, on the expression of color and on the postharvest quality of fruit of experimental tomato hybrids
The normal genotypes proved to be less firm at the beginning of the maturity stage than the heterozygous genotypes rin (C1, Table 3), ogc and norA (C3), and the genotypes ogc/ogc rin+/rin nor+/norA (C4); besides, they did not differ significantly from the genotypes ogc+/ogc rin+/ rin (C2)
Summary
Tomato (Solanum lycopersicum L.) is one of the most highly consumed vegetable crops in the world. Brazil ranks eighth in the worldwide ranking for tomato production (FAO, 2013). Tomato fruit is highly perishable, with losses of up to 21% after harvest (Rinaldi et al, 2011); it has high-water content, about 90 to 95%, which makes it fragile (Rocha et al, 2009). The main studied aspects are yield increase, pest and disease resistance, and the improvement of fruit quality. An alternative to extend the shelf life of tomato fruit has been to affect the natural maturation process of Solanum lycopersicum lines by the incorporation One of the factors associated with this last aspect is the greater natural conservation of the fruit postharvest, and this conservation may be achieved by the production of F1hybrid fruit that is firmer and has better color (Andrade Júnior et al, 2001).
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