Avaliação de parentais e híbridos experimentais de melão rendilhado

Abstract

RESUMOObjetivou-se, neste trabalho, avaliar o desempenho de 38 genótipos de melão rendilhado, sendo seis parentais, 30 híbridos experimentais (15 híbridos e 15 recíprocos) e dois híbridos padrões de mercado (Bônus nº2 e Louis), quanto às características produtivas. O experimento foi conduzido no setor de Olericultura e Plantas Aromático-Medicinais da Faculdade de Ciências Agrárias e Veterinárias, UNESP-Jaboticabal, em casa de vegetação, em delineamento em blocos casualizados, com três repetições, e 38 tratamentos, contendo uma única fileira de cinco plantas, com espaçamento ente si de 0,5 m e 1 m entrelinhas. A semeadura foi realizada em 01 de agosto de 2007, utilizando bandejas de poliestireno expandido de 128 células, e quando as mudas apresentaram a primeira folha não cotiledonar, realizou-se o transplante. As plantas foram cultivadas em substrato de fibra da casca de coco, sendo a irrigação e adubação realizadas conjuntamente por fertirrigação. A colheita foi realizada durante o mês de dezembro, sendo avaliados: produção total, diâmetro médio transversal e longitudinal do fruto, índice de formato de fruto, diâmetro médio transversal e longitudinal do lóculo, índice de formato do lóculo, diâmetro médio da inserção do pedúnculo dos frutos, precocidade e concentração de colheita. Realizou-se análise de variância para cada característica e comparação entre as médias pelo teste de Scott-Knott, ao nível de 5% de probabilidade. Com base nos resultados obtidos, concluiu-se que os genótipos (híbridos) experimentais 4, 23, 24, 26 e 28 obtiveram os melhores desempenhos sendo semelhantes aos híbridos comerciais. Termos para indexação:Cucumis melo, cultivares, híbridos experimentais. ABSTRACTThe objective of this study was to evaluate the performance of 38 net melon genotypes, six parents, 30 experimental hybrids (15 hybrids and 15 reciprocals) and two standard hybrid market, on the characteristics productive. The experiment was conducted in the experimental area of the Sector of Vegetable Crops and Aromatic Medicinal Plants, Faculty of Agricultural and Veterinary Sciences, UNESP-Jaboticabal, in a greenhouse, with three replications, each with 38 plots, contained a single row of five plants with spacing between them of 0.5 m and 1 m between lines. The seedlings were performed on August 1 st , 2007, in expanded polystyrene trays with 128 pyramidal cells. Transplanting was done when the seedlings showed the first non-cotyledon leaf. The plants were grown on the substrate of the shell of coconut fiber, and the irrigation and fertilization carried out jointly by fertirrigation. The harvest was conducted during December, and the following factors were evaluated: total production, transverse and longitudinal diameters of fruit, format index of fruit, transverse and longitudinal diameters of locule, format index of locule, insertion diameters, earliness, concentration of harvest. There was performed an analysis of variance to each feature and comparison between the average test of Scott-Knott at 5% probability. Based on the fin...

Cucurbits powdery mildew race identity and reaction of melon genotypes1

“…If resistance to race 4 in these lines is dominant or codominant, they could be used for making F 1 hybrids. Resistant genotypes were shown to have high complementarity and high specific combining ability (SCA), more specifically when JAB-11 is crossed with JAB-20 (Vargas et al 2010). If resistance to race 4 is, however, 1 Averages followed by the same letter do not differ significantly at p < 0.01, by the Scott-Knott test; 2 R = resistant and S = susceptible; ** significant at p < 0.01.…”

“…The Faculty of Agrarian and Veterinarian Sciences of the Universidade Estadual Paulista "Júlio de Mesquita Filho" (UNESP-FCAV) has a working collection of cucurbit germplasm and has developed melon-inbred lines with high fruit quality and yield (Vargas et al 2010). There is, however, no information about the reaction of such genotypes to CPM.…”

Reaction of melon genotypes to Didymella bryoniae (Fuckel) Rehm

“…Also, the JAB-11 and JAB-20 lines (Table 1) were used. These lines were developed by the melon breeding program of the UNESP-FCAV, and have good general combining ability (GCA), especially for the fruit mass (kg fruit -1 ) and production (kg m -2 ) traits, which when combined resulted in a high-yielding F 1 hybrid (Vargas et al, 2010). The reaction of genotypes to D. bryoniae was evaluated by two assays to optimize the available space, especially in the humidity chamber, in view of the large number of genotypes used.…”

“…Thus, it is necessary to introgress the resistance genes to obtain highly productive and resistant hybrids, since these exhibit high specific combining ability (Vargas et al, 2010). Thus, the resistance genes present in genotypes AC-29, PI 532830, C160, Charentais Fom 1, PI 482398 and PI 420145 can be used to develop varieties or hybrids with genes resistant to D. bryoniae from the strains JAB-11 and JAB-20 of the melon breeding program of UNESP-FCAV.…”

Material evaluation for bagging of cantaloupe melons

“…Its striking characteristics with respect to aroma, visual appearance, taste, and texture culminate in a growing demand among consumers (VARGAS et al, 2010).…”