关键词: 海桐, IBA, NAA, 水培

Abstract: Robust branches of Pittosporum tobira under 1 year old were selected as hydroponic cuttings，and concentration of 50，100，200 mg/L of IBA and NAA were compounded to probe the most suitable plant growth regulators and the optimum concentration hydroponics for root growth of Pittosporum tobira. The results showed that the rooting rate of Pittosporum tobira cuttings was promoted by the treatment of IBA 50，200 mg/L，NAA 50，200 mg/L，and the most distinguished treatments were IBA 50 mg/L and NAA 50 mg/L treatment，under which Pittosporum tobira cuttings took root 24 days earlier than the control group. Only NAA 50 mg/L treatment promoted the germination of the cuttings，and there were no obvious effects with other treatments. IBA 50 mg/L ，NAA 50 mg/L could also promote the growth of adventitious roots（amount）of Pittosporum tobira cuttings.

Key words: Pittosporum tobira, IBA, NAA, hydroponics