LAUSR

Abstract Rootstocks of 'Flame seedless' vines (Vitis vinifera L.) are important in viticulture. Four rootstock types, for example, (Freedom', '140 Ruggeri', ‘1103 Paulsen’, and 'own-root') were assessed effects on stability fruit clusters of Flame seedless at low storage temperature. The current study was done during two growing seasons (2017–2018) on the vines a 12-year-old in sandy soil. Bunche samples were harvested when the total soluble solids content (SSC%) at 16%. From that point, the bunches were stored at low temperature (4 ± 1 °C and 98 ± 1 RH%) for 90 days. All measurements were measured every ten days interval from experiment time. The ‘1103 Paulsen’ rootstock has given more resistant to low temperature for 90 days compared to other rootstocks by providing more ascorbic acid (AA) content of bunches. Also, it presents a more increase in antioxidant enzyme activities (AEAs) during the storage period. Subsequently, The AEA reflects on the reduction of the oxidative reactions as to less malondialdehyde (MDA), and protein carbonyl group (PCG) accumulations. Thereafter, it maintenance the plasma membranes so, less ion leakage percent. The outcomes were reflected in the quality of 'Flame seedless' bunches which are affected via impacts of four rootstocks during the storage duration. The conclusion that the ‘1103 Paulsen’ provides more activities in AEAs at low temperature and it extends storage ability for fruit clusters up to the 80th day of storage time. Fruit clusters of ‘1103 Paulsen’ rootstock was acceptable at the 80th day of storage time for customers compared to other rootstocks (at 60th day). Overall, the ‘1103 Paulsen’ rootstock provides the ability of fruit clusters to resist low storage temperature.