POSTHARVEST QUALITY OF SWEET CHERRY FRUITS AS AFFECTED BY BIOREGULATORS
Jelena KalajdžićUniversity of Novi Sad, Faculty of Agriculture, Department of Fruit Growing, Viticulture, Horticulture and Landscape Architecture, 21000 Novi Sad, Serbia
Biserka MilićUniversity of Novi Sad, Faculty of Agriculture, Department of Fruit Growing, Viticulture, Horticulture and Landscape Architecture, 21000 Novi Sad, Serbia
Mladen PetrešUniversity of Novi Sad, Faculty of Agriculture, Department of Plant and Environmental Protection, 21000 Novi Sad, Serbia
Aleksandra StankovUniversity of Novi Sad, Faculty of Agriculture, Department of Plant and Environmental Protection, 21000 Novi Sad, Serbia
Mila GrahovacUniversity of Novi Sad, Faculty of Agriculture, Department of Plant and Environmental Protection, 21000 Novi Sad, Serbia
Nenad MagazinUniversity of Novi Sad, Faculty of Agriculture, Department of Fruit Growing, Viticulture, Horticulture and Landscape Architecture, 21000 Novi Sad, Serbia
Zoran KeserovićUniversity of Novi Sad, Faculty of Agriculture, Department of Fruit Growing, Viticulture, Horticulture and Landscape Architecture, 21000 Novi Sad, Serbia
During the cold storage of sweet cherry, severe losses can occur due to the water loss, phytopathogenic fungi and physiological disorders. The aim of this research was to assess the effects of treatments with NAA (α-naphthaleneacetic acid), BA (6-benzyladenine), and GA3 (gibberellic acid) on fruit quality at harvest and after
21 days of storage under two regimes, including 0°C, RH (relative humidity) 90% and 3°C, RH 70%, and after additional shelf life exposure. Sweet cherry cultivars – ‘Summit’, ‘Kordia’ and ‘Regina’ – were treated with bioregulators at the end of flowering. NAA significantly increased the fruit weight at harvest compared to the control in all cultivars assessed. BA stimulated the fruit growth in ‘Kordia’ and ‘Regina’, while it was ineffective in ‘Summit’. GA3 caused significant increase in fruit weight by 8.3% in ‘Kordia’ only. Moreover, BA and GA3 induced a higher firmness of fruits at harvest. Weight loss of fruits during storage at 0°C, RH 90%, was increased with NAA and reduced with GA3 in ‘Regina’ only. BA and GA3 reduced the weight loss of sweet cherry fruits stored at 3°C, RH 70%. Bioregulator treatments increased TA (titratable acidity) in fruits at harvest, while the effects on TA during storage were variable depending on the cultivar. ‘Summit’ had the highest sensitivity to storage fruit rot. BA and GA3 decreased the disease occurrence on fruits stored at 0°C in ‘Summit’ and ‘Kordia’.
Keywords:Prunus avium L., gibberellic acid, storage, shelf life, weight loss, fruit rot
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