Effect of different prohexadione-calcium concentration in regulating growth, physiological changes and postharvest quality of different roselle variety under greenhouses
2022
Azmi M. N. A. | S. Zaharah S. | Ahmad S. H.
The brilliant red color of roselle is because of its anthocyanin content. The pigment has the potential to be commercialized as a natural color in the food industry. Anthocyanin content in roselle is influenced by several factors such as plant species, agronomic practices and environmental conditions. The application of plant growth regulators, such as prohexadione-calcium (Proca), has been reported to regulate color development, such as anthocyanin. Thus, this study was conducted to determine the effect of Proca application on growth and postharvest quality attributes of two varieties (UMKL1 and UKMR-2) of roselle in greenhouse conditions. The plants were sprayed with four concentrations of Proca (0, 100, 200 and 300 mg L-1) at 45 days after transplant (DAT). Roselle calyx was harvested at 75 DAT and analyzed. A reduction in height growth was observed with all Proca application and 300 mg L-¹ gave the highest shoot reduction. Calyx postharvest quality showed that Proca application increased pH, C* value and anthocyanin content. As for roselle variety, UMKL-¹ showed better response to Proca application, with improved calyx postharvest quality compared to UKMR-². Therefore, the application of Proca can enhance anthocyanin regulation in roselle without adverse effect on its postharvest quality.
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