Effect of Growth Regulators (GA₃ and NAA) on Growth and Development of Microplant of Potato (Solanum Tuberosum L.) Varieties Kufri Bahar and Kufri Surya

The present study was conducted at Central Research Potato Institute Campus, Modipuram, India to assess the effect of gibberellic acid (GA₃) and á-naphthalene acetic acid (NAA) on in vitro microplants development in two potato varieties Kufri Bahar and Kufri Surya. The higher concentration of GA₃ and NAA in combination (0.4 mg/l+0.04 mg/l) showed a decrease in parameters like number of leaves, number of nodes, internode length, shoot length and root length. The concentration of GA₃+NAA (0.05mg/l+0.005 mg/l and 0.1mg/l+0.01 mg/l) led to increase in all parameters as compared to control and GA₃+NAA (0.1mg/l+0.02mg/l and 0.2mg/l+0.02mg/l) treatments in both the varieties but GA₃+NAA at (0.2 mg/l+0.01mg/l) concentration gave best results for number of leaves, number of nodes, internode length, shoot length and root length. Result showed that the concentration of GA₃+NAA (0.05mg/l+0.005 mg/l +0.1mg/l+0.01 mg/l) is best for development of complete plantlets.