Evaluation of the Postharvest Performance of Kiwifruit Under the Application of a Glycine-Betaine-Based Biostimulant During the Growing Season

The demand for high-quality agricultural products is increasing; however, this requirement is becoming increasingly challenging due to the effects of climate change, which can cause abiotic stress. In this research, we studied the performance of kiwifruit (Actinidia deliciosa var. ‘Hayward’) 60 days after storage for two different cultivation periods, in which a glycine betaine biostimulant (GB) was applied to the kiwi trees via irrigation under field conditions. Postharvest analysis was performed by measuring the fresh and dry weight of the kiwifruit, the soluble solids content, and titratable acidity. To assess the antioxidant traits of the kiwifruit, DPPH and ascorbic acid contents were recorded. Data analysis revealed that the GB treatment proved beneficial for kiwifruit during storage, enhancing their antioxidant capacity as indicated by their higher ascorbic acid content (vitamin C) compared to the control. This qualitative difference may benefit the commercial requirements of kiwifruit cultivation under the abiotic conditions of climate change, which prompts us to further investigate the application of amino acid biostimulants. This research complements the existing literature on the implementation of biostimulants, as reports regarding their application in kiwifruit cultivation are limited, and provides an optional solution for meeting the commercial needs of kiwifruit cultivation and improving the adaptability of kiwifruit cultivation under abiotic stress conditions.