楸树嫩枝扦插生根的主要影响因子分析

研究了插条的不同取材部位、不同激素组合以及不同扦插时间对4个类型（品种）楸树（Catalpa bungei C．A．Mey．）嫩枝插条生根的影响。结果显示，取楸树嫩枝的梢部与中部作为插条，扦插生根效果较好；用1．0g·L^-1 IBA和0．5g·L^-1 NAA混合溶液处理的插条生根效果最好，生根率可达45．43％；6月中旬是楸树嫩枝扦插的最适时期。4个楸树类型（品种）中，‘圆基长果楸’和‘豫楸1号’插条的生根能力较高，而‘金丝楸’的生根能力较差。

Analysis of main influence factors on rooting of twig cutting of Catalpa bungei

Effects of different cutting parts, phytohormone combinations and cutting times on rooting of twig cuttings of four types （varieties） of Catalpa bungei C. A. Mey. were studied systematically. The results show that the rooting ability of cuttings from tip and middle parts of twigs is better. The best rooting effect is obtained when treating the cuttings with a mixed solution containing 1.0 g · L^-1 IBA and 0.5 g · L^-1 NAA is the best, and the rooting rate reaches 45.43%. The best cutting time of twig cuttings of C. bungei is in the mid-June. In four types （varieties） of C. bungei, the rooting ability of ＇ Yuanjichangguoqiu＇ and ＇ No. 1 of Yuqiu＇ is better, while that of ＇ Jinsiqiu＇ is poor.