Controle de degrane e conservação pós-colheita sob CaCI2 e 1-MCP de uva "Isabel‟ produzida no Vale do Sirijí(PE/PB) / Berry drop control and postharvest conservation under CaCl2 and 1-MCP grape "Isabel‟ produced in the Sirijí Valley (PE/PB).

AUTOR(ES)
DATA DE PUBLICAÇÃO

2010

RESUMO

The larger quality problem of table grape is related to the ease berry drop or abscission of berries after harvest of clusters, due to the development of the abscission zone. This study aimed to evaluate the effect of calcium chloride (CaCl2) and 1-MCP (1-methylcyclopropene), on postharvest conservation under different storage conditions of Isabel‟ grape, produced in the Sirijí Valley (PE/PB), conducted in three experiments. In The first experiment Isabel‟ grapes produced at Natuba, Sirijí Valley-PB, Brazil, were treated postharvest with calcium chloride (CaCl2) and modified atmosphere (MA) aiming to evaluate the quality maintenance during storage at 121 C and 852% RH. The experiment was carried out in a completely randomized design, in a factorial scheme 5 x 2 x 5 with three replications, with five doses of CaCl2 (0,0; 0,5; 1,0; 2,0 and 4,0%), two types of atmosphere (room and modified) and five evaluations. The evaluations were soluble solids (SS), titratable acidity (TA), SS/TA ratio, pH, ascorbic acid, decay incidence, rachis appearance, and berry drop index. TA, ratio SS/TA, pH, incidence of decay, and mass loss were influenced by both MA and CaCl2. Berry drop index was not affected by treatments. However, rachis appearance was maintained by MA. The application of CaCl2 associated with MA reduced the mass loss and incidence of decay, and kept ascorbic acid content. In the second experiment Isabel‟ grapes from a commercial orchard in the Sirijí Valley - PB were harvested at commercial maturity with the aim of evaluating the effect of doses 1-MCP applied during 12 hours in sealed plastic boxes under room conditions (25 2 C and 75 2% RH) during storage under modified atmosphere at room temperature. The experiment was carried out in a completely randomized design, in factorial scheme 4 x 7, with three replications, with four doses of 1-MCP (0, 500, 1000, and 2000 ppb) and seven evaluations (0, 2, 4, 6, 8, 10 and 12 days). The evaluations were soluble solids (SS), titratable acidity (TA), SS/TA ratio, pH, ascorbic acid, anthocyanins, coloration (Lightness, a *, b *, chroma and H), incidence of decay, mass loss, firmness, rachis appearance, and berry drop index. The SS, AT, SS/TA, L, Chroma, and incidence of decay were not affected by 1- MCP. The doses of 1-MCP influenced on pH, retention of ascorbic acid, increase of anthocyanins, rachis appearance, lower mass loss, and maintenance of firmness. The berry drop index decreased as the doses of 1-MCP applied increased. In the third experiment, Isabel‟ grapes produced in the Sirijí Valley (PE/PB) were treated postharvest with four doses of 1-MCP (0, 500, 1000, and 2000 ppb) and kept under modified atmosphere and refrigeration (8 1 C and 85 2% RH), and followed 18 days transferred to room conditions (25 2 C and 75 2% RH), to simulate transport conditions to the market. The experimental design was a completely randomized, with three replications where each experimental unit consisted of three clusters, two factorial schemes were applied: a) 4 x 7, with four doses of 1-MCP and seven evaluation periods during refrigeration (0, 3, 6, 9, 12, and 18 days), and b) 4 x 4, with four doses of 1-MCP and four evaluation, after transference to room conditions (18, 18+2; 18+4, and 18+6 days). The evaluations were soluble solids (SS), titratabe acidity (TA), SS/TA ratio, pH, ascorbic acid, anthocyanins, coloration, incidence of decay, mass loss, firmness, rachis appearance, and berry drop index. During stored under refrigeration, 1-MCP doses did not influence SS, TA, SS/TA, ascorbic acid, coloration (L, a *, C, H), and incidence of decay. The pH, anthocyanins, firmness, and berry drop index was influenced by the levels of a 1-MCP during the storage under refrigeration. After the transference of clusters to room temperature the doses of 1-MCP influenced the SS, ascorbic acid, firmness, anthocyanins, and berry drop index. Higher doses of 1-MCP promoted the maintenance of anthocyanins, lower rates of mass loss, and reduced berry drop index under room conditions.

ASSUNTO(S)

degrane vitis labrusca 1-metilciclopropeno aparência do engaço podridão tecnologia de alimentos vitis labrusca berry drop 1-methylcyclopropene rachis appearance decay

ACESSO AO ARTIGO

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