Effect of hormonal concentration on rooting behaviour of Ginkgo biloba L. in agro-climatic zone of Dehradun, Uttarakhand, India

A survey was conducted in the state of Uttarakhand for the collection of Ginkgo biloba. Samples of G. biloba were collected from the Botany Department (DSB College, Kumaon University, Glenthorn Compound, High Court Campus), Old Rajbhawan (Snow View), and Rajbhawan (Nainital) of Uttarakhand. Macro-propagation studies were conducted using stem cuttings of dioecious plants. The cuttings were thoroughly washed with running tap water to remove soil particles. One set of male and female stem cuttings was kept as control. The male and female stem cuttings were dipped in different concentrations (100, 200, 300 and 500 ppm) of Indole Butyric Acid (IBA), Indole Acetic Acid (IAA) and Napthalene Acetic Acid (NAA) for 4 h. Cuttings were then implanted in hycotrays (root trainers) containing soilrite. Indole Butyric Acid at 300 ppm was found to be the best for rooting of both male and female stem cuttings in G. biloba.