K-IBA处理对仿栗秋季扦插生根的影响

摘　要：以仿栗秋季健壮枝条为材料，进行秋季扦插，并研究生根过程中过氧化物酶(POD)酶活性、超氧化物歧化酶(SOD)酶活性和丙二醛（MDA）含量的动态变化。结果表明: K-IBA-3000mg/kg处理的生根率最高为78%，KNAA-1000mg/kg处理的生根率最低为13% ，K-IBA处理的三个浓度生根率排序为：K-IBA-3000mg/kg（78%）﹥K-IBA-1000mg/kg（63%）﹥K-IBA-5000mg/kg（38%）。仿栗秋季扦插生根过程中，SOD酶活性呈现先上升后下降的趋势，插后20 d达最大值，之后逐渐降低；POD酶活性和SOD酶活性变化情况相似；MDA含量先迅速积累，插后约20 d出现峰值，随后一直下降。关键词：仿栗；秋季扦插；生根率；酶活性

Effects of K-IBA Treatments on Autumn-Cutting Rooting of Sloanea hemsleyana

Cuttings propagation technology of Sloanea hemsleyana autumn robust branches studied with dynamic changes of peroxidase（POD） activity,superoxide dismutase（SOD） activity and malondialdehyde（MDA） content during rooting.The results showed that cuttings with K-IBA-3000 mg/kg treatment had the highest rooting percentage which was 78%,cuttings with KNAA-1000 mg/kg treatment had the lowest rooting percentage which was 13%,the rank of the K-IBA treatment was：K-IBA-3000 mg/kg（78%）﹥ K-IBA-1000 mg/kg（63%）﹥ K-IBA-5000 mg/kg（38%）.During rooting of Sloanea hemsleyana autumn cutting,the superoxide dismutase activity increased first and then declined,and havd a peak on the 20th.The peroxidase activity changes were similar to the superoxide dismutase activity.The malondialdehyde content accumulated first rapidly,and then declined all the time,it had a peak on the 20th.