Changes in the photosynthetic characteristics of Catharanthus roseus L. as a result of exogenous growth regulators

In the present investigation, different plant growth regulators and retardants were used to analyse their effects on photosynthetic characteristics of common periwinkle ( Catharanthus roseus (L.) G. Don., Family: Apocynaceae). The plant growth retardant used was paclobutrazol. The synthetic growth regulator used was gibberellic acid. The exogenously applied non-traditional growth regulator was an elicitor named Pseudomonas fluorescens . From the results of this investigation, it can be concluded that these growth retardant and regulators altered the photosynthetic characteristics of C. roseus to a great extent. These findings might have a great role in the ayurvedic or natural medicine, as more and more people became interested in traditional medicine, due to the secondary hazardous effects of most of the modern synthetic medicines.