Post-harvest shelf life of tomato fruit may be increased by deploying mutant alleles which affect the natural ripening process and/or by a favorable genotypic background. Among the several ripening mutant genes, alcobaça (alc) has proved to be highly efficient in increasing shelf life of commercial tomato fruits, especially in heterozygosis, a state at which no limiting deleterious effects upon fruit color occur. The effects of heterozygosity in the alcobaça locus (alc + /alc) on yield and fruit quality traits of tomato hybrids with three genotypic backgrounds. We evaluated three pairs of hybrids obtained from crosses between the near-isogenic pollen source lines Flora-Dade (alc + /alc + ) and TOM-559 (alc/alc), and three maternal lines (Stevens, NC-8276 and Piedmont). The six treatments were factorial combinations of two different status in the alc locus (alc + /alc and alc + /alc + ) versus three different genotypic backgrounds (maternal lines). Fruits were harvested at the breaker stage of maturation and stored in shelves at 21 o C for 14 days. Yield and fruit quality traits were then evaluated. Regardless of the background, the alc allele in heterozygosis (alc + /alc) did not interfere with the total yield, commercial yield, average mass per fruit, average mass per commercial fruit, fruit shape, or with fruit peduncular scar diameter. The alc + /alc genotype reduced the rate of firmness loss and delayed evolution of the red color of the fruit, thus contributing to an increase of the post-harvest shelf life for all three genotypic backgrounds. Key words: Lycopersicon esculentum, alcobaça, ripening mutant, long shelf-life O ALELO ALCOBAÇA E O BACKGROUND GENOTÍPICO AFETAM A PRODUTIVIDADE E A CONSERVAÇÃO DE HÍBRIDOS DE TOMATEIRORESUMO: A vida de prateleira dos frutos de tomate pode ser extendida, seja empregando-se alelos mutantes que afetam o processo natural de amadurecimento, seja por meio de background genotípico favorável. O alelo alcobaça (alc) em heterozigose tem-se mostrado bastante eficiente no sentido de prolongar o período de conservação dos frutos em pós-colheita, sem que ocorra prejuízo na coloração. Avaliaram-se os efeitos do alelo alcobaça em heterozigose (alc + /alc) sobre as características de produção e qualidade pós-colheita de frutos de híbridos de tomateiro em diferentes backgrounds genotípicos. Foram avaliados três pares de híbridos, obtidos a partir de cruzamentos entre as linhagens quase isogênicas Flora-Dade (alc + /alc + ) e TOM-559 (alc/alc) e três diferentes linhagens maternas (Stevens, NC8276 e Piedmont), correspondendo a uma combinação fatorial de duas constituições genotípicas no loco alcobaça (alc + /alc e alc + /alc + ) vs três backgrounds genotípicos. Os frutos foram colhidos no estádio breaker de maturação e armazenados em câmara fria a 21 o C, durante 14 dias. Foram avaliadas características de produção e de qualidade. Independentemente da linhagem materna dos híbridos, o alelo alcobaça em heterozigose não interferiu nas características produção total, produção comer...
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