Utilizing the γ-Irradiated Sodium Alginate as a Plant Growth Promoter for Enhancing the Growth, Physiological Activities, and Alkaloids Production in Catharanthus roseus L.

Sodium alginate is a polysaccharide that is largely obtained from the brown algae (Sargassum sp.). It has been used as a wonderful growth promoting substance in its depolymerized form for various plants. The aim of this study was to find out the effects of various concentrations of γ-irradiated sodium alginate (ISA), viz., deionized water (control, T0), 20 (T1), 40 (T2), 60 (T3), 80 (T4), and 100 ppm (T5) on the agricultural performance of Catharanthus roseus L. (Rosea) in terms of growth attributes, photosynthesis, physiological activities, and alkaloid production. The present work revealed that ISA applied as leaf-sprays at concentrations from 20 to 100 ppm might improve growth, photosynthesis, physiological activities, and alkaloid production in C. roseus L. significantly. Of the various ISA concentrations, 80 ppm proved to be the best one compared to other concentrations applied.