Effect of phytohormones on morphophysiological parameter of Kalmegh (Andrographis paniculata Nees)

Abstract

Kalmegh Andrographis paniculata is an erect annual herb consider as “king of bitter. The experiment was laid out in randomized block design with three replications. The various phytohormones were applied as foliar at 30 days after transplanting. The treatments comprised of T1 (NAA 50 mg/l), T2 (NAA 100 mg/l), T3 (NAA 200 mg/l), T4 (GA3 50 mg/l), T5 (GA3 100 mg/l), T6 (GA3 200 mg/l), T7 (paclobutrazol 50 mg/l), T8 (paclobutrazol 100 mg/l), T9 (paclobutrazol 200 mg/l) andT10 (control). Results were significantly increase plant height with GA3 100 mg/l treatment while minimum plant height was recorded in paclobutrazol 100 mg/l application during the different growth stages as compared to control. The various morphological growth parameter i.e. number of leaves, number of primary branches were significantly higher in GA3 100 mg/l treatment as compared to control during the growth period of Kalmegh. The results concern to physiological parameters indicated that the leaf area, relative growth rate and net assimilation rate increase significantly in the GA3 100 mg/l during the different growth stages.