Determination of the Suitability of the Newly Breed Güz Gülü Grape Cultivar for Cold Storage

Abstract

In grape production, in order to maintain the competitive power in the domestic and foreign markets and to meet the market needs, it is necessary to have the product in a wide period of time. Especially late and high quality table grape varieties that are suitable for cold storage are needed. In the study, the suitability of Güz gülü grape variety for cold storage was investigated. The study was carried out during the harvest period of 2018 and 2019. The clusters were placed in bags weighing 5 kg and dual releasing SO2 pads with a dose of 0.9 g kg-1 of sulphur dioxide were placed in the bag. Müşküle variety was used as a control. After the applications, the grapes were stored for 90 days at 0-1 °C and 90±5% relative humidity. In order to determine the fruit quality characteristics of the samples at 15-day intervals throughout the storage period; weight loss, total soluble solids, titration acidity, maturity index, berry firmness, the removal force of the berries, cluster rachis color, decay rate, berry cracking rate and sensory analysis values were determined. It has been determined that Güz Gülü grape variety is not suitable for cold storage in Tekirdağ location due to the cracking of the skin. It was determined that the experiment should be done in locations with higher day and night temperature difference, better sun exposure and continental climate. In addition, it is recommended to apply calcium or other support components to increase the resistance of berry skin against cracking.