Wild hydrangea

Abstract: This study was conducted to find out the appropriate type and concentration of plant growth regulator for mass production of wild type Hydrangea serrata. And the optimal soaking time for rooting of the cuttings was also investigated. When the cuttings of Hydrangea serrata were cultivated for 6 weeks after immersing in 50 mg · L of IBA for 3 hrs, the number of roots was 90.6. However the number was significantly decreased when the cuttings were treated with 10 mg · L of IBA. The rooting ratio was 100% when the cuttings was immersed in 1,000, 2000 and 3000 mg · L of NAA solution for 5, 3 and 10 sec., respectively. Despite the perfect rooting, the number of roots was decreased. The number of roots was 105.5 when the cuttings were treated in 2,000 mg · L of NAA for 5 sec., which was the highest number in NAA treatment. Overall, the rooting ratio and growth was better when the cutting was treated with low concentration of IBA (50~250 mg · L) than the treatment of NAA. And the most appropriate concentration and time fot the treatment of IBA was 50 mg · L and 3 hrs, respectively.