Periwinkle, Catharanthus roseus (L.) G.Don, Synonym ( Vinca rosea) is a tropical perennial plant, belonging to apocynaceae family. The main reason of great interest in periwinkle is its ability to synthesize a wide range of terepenoid indole al kaloids (TIAs) which are valued for their wide spectrum of pharmaceutical effects. The plant contains more than 100 alkaloid, distributed in all parts of plant but in different proportions. Total alkaloid concentrations in root amount to 2-3% and sometimes reaches upto 9% in fibrous roots. The root alkaloid is ajmalicine. Use of biofertilizers containing beneficial microorganisms are known to improve plant growth through the supply of plant nutrients and releasing growth regulators and pathogen inhibitor compounds and also increases the yield . A pot culture experiment was conducted to study the inoculation of Biofertilizer as single and consortium inoculant (A.lipoferum, A.chrococcum, B.megaterium, P.fluorescens) shoot weight, root yield, protein content, of C.roseus roesea.
