Physiological Analysis of Calyx Growth and Yield Analysis in Roselle (Hibiscus subdariffa L.)

Abstract

The study conducted during the month of July to November, 2022 aimed to evaluate the roselle (Hibiscus subdariffa) genotypes suitable for calyx yield. Five roselle genotypes were evaluated in four replications for physiological analysis of calyx growth and it’s biochemical status under rainfed condition. The actual and effective growth and lag periods for calyx growth ranged between 33 and 37, 15.00 and 21.82, 11.93 and 22.36 days, respectively. Genotype AHC-1 required lower actual growth period, lag period and longer effective growth period. The genotype, HSLC-1 recorded minimum plant height, higher number of leaves, number of branches and number of fruits and maintained higher fresh and dry weight of calyx productivity. Genotype, AHC-1 was superior for maintaining fresh and dry weight of calyx, volume of calyx per flower bud, higher absolute growth rate of calyx, higher phenolic and anthocyanin content in calyx. The genotypes, HSLC-1 and AHC-1 required maximum growing degree days and maintained higher heat use efficiency, helio thermal units and heliothermal use efficiency. Considering physiological and biochemical variation in calyx growth and yield influenced by roselle genotypes, genotype AHC-1 with highest fresh weight of calyx per flower bud,  highest phenolic content and  anthocyanin content having high medicinal value could be suggested to farmers. In earliness point of view and overall calyx productivity the genotype HSLC-1 could be suggested to farmers.