Postharvest Conservation of Structural Long Shelf Life Tomato Fruits and With the Mutant Rin Produced, in Edaphoclimatic Conditions of the Southern State of Tocantins

Abstract

The high temperature of growth environment can affect the postharvest quality of tomato fruits. In this situation, an alternative for the farmers is the use of hybrid cultivars that produce long shelf life fruit with longer postharvest shelf life when compared to normal varieties of fruits. The objective of this research was to compare the postharvest conservation of fruits of structural long shelf life tomato hybrids and with the mutant rin. The fruits evaluated were from fifteen tomato genotypes produced under the edaphoclimatic conditions of the southern State of Tocantins, being four of them long shelf life type hybrids (with rin allele) which were: Tyler, Rebeca, Carmem and AF 13527; nine of them structural long shelf life hybrids: Lumi, Débora Max, Michelli, Tammy, AF 12525, AF 11097, AF 13363, AF 13364 and AF 13525; and two normal fruit cultivars: Santa Clara and Drica. The fruits were harvested at the breaker stage and stored in a controlled environment (20 °C and relative humidity of 60%). The half-life firmness of fruits of genotypes with a structural genotypic long shelf life background ranged from 6.25 to 13.44 days for the genotypes Tammy and AF13525, respectively, not differing from the long shelf life genotypes with rin allele. Despite the fact that daytime temperatures are higher than those recommended for the tomatoes crops, it was observed that if the fruits are stored in appropriate conditions (20 °C and relative humidity of 60%), the color and firmness of the fruits with a long shelf life genotypes with rin allele and structural genotypic background evolve more slowly than the fruits of normal genotypes. Under these conditions, it took the fruits 7 to 8 days to acquire a red color on more than 80% of the surface after being harvested.Index terms: Solanum lycopersicon; hybrids; firmness; color. RESUMOA temperatura elevada do local de cultivo pode afetar a qualidade pós-colheita dos frutos do tomateiro. Nessa situação, uma alternativa para os produtores, é o uso de cultivares híbridas que produzem frutos longa vida com maior tempo de conservação em pós-colheita, quando comparado com cultivares de frutos normais. Neste trabalho, objetivou-se avaliar a conservação em pós-colheita de frutos de híbridos de tomateiro longa vida estrutural e com mutante rin cultivados em duas épocas sobre ambiente protegido na região Sul do estado do Tocantins. Os tratamentos foram constituídos de 15 genótipos, sendo quatro híbridos com frutos tipo longa vida (com alelo rin) que foram: Tyler, Rebeca, Carmem e AF 13527; nove híbridos com frutos tipo longa vida estrutural: Lumi, Débora Max, Michelli, Tammy, AF 12525, AF 11097, AF 13363, AF 13364 e AF 13525 e duas cultivares de frutos normais: Santa Clara e Drica. Os frutos foram colhidos no estádio de breaker e armazenados em ambiente controlado (20 ºC e umidade relativa de 60%). A meia vida da firmeza dos frutos dos genótipos com background genotípico longa-vida estrutural variou de 6,25 a 13,44 dias nos genótipos Tammy e AF13525, respectivamente, não diferind...

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“…Tomato is a climacteric fruit and its post-harvest shelf life is short due to the rapid loss of firmness (softening) during maturation 4 . The main cause of rotting of fruit is the extent of softening that direct effect on palatability, shelf life, resistance to postharvest infections, transportation, storage and consumer acceptance 5 , 6 .…”