Effect of Sucrose and Antioxidant Treatments on Postharvest Water Relations and Physiological Changes in Cut Gypsophila (Gypsophila paniculata L.) cv. Star World

Abstract

The postharvest longevity and market value of cut Gypsophila paniculata L. largely depend on the maintenance of water relations and physiological integrity after harvest. The present investigation evaluated the effects of sucrose and selected antioxidant treatments, applied individually and in combination, on postharvest water balance, physiological weight changes, fresh and dry weight, and water uptake efficiency of cut Gypsophila cv. Star World. Fourteen treatments, including sucrose, ascorbic acid, potassium metabisulphite (KMS), calcium chloride, their combinations, and a control, were assessed under controlled laboratory conditions. The results clearly demonstrated that preservative solutions containing sucrose, particularly when combined with potassium metabisulphite, significantly improved postharvest performance. The treatment comprising sucrose (2%) + KMS (200 ppm) recorded the lowest physiological change in weight, highest fresh and dry weight retention, and superior water uptake to water loss ratio, indicating efficient hydration and delayed senescence. Sucrose alone enhanced water balance by improving osmotic regulation, while antioxidants and antimicrobial agents contributed to reduced microbial blockage and oxidative stress. In contrast, untreated flowers exhibited rapid moisture loss, poor water relations, and early senescence. Overall, the study highlights the synergistic role of sucrose and antimicrobial antioxidants in maintaining postharvest water relations and physiological stability, offering a scientifically validated preservative strategy for extending vase life and improving the commercial quality of cut Gypsophila.