水杨酸对毛枝五针松幼苗生长发育和防御酶活性的影响1）

摘要

We used the nutrition bag nursery trials to study the effects of salicylic acid ( SA) on Pinus wangii seedling growth and development , as well as defensive enzyme activities .Six different concentrations of salicylic acid ( SA) solutions ( 0, 0.25, 0.50, 1.00, 1.50, and 2.00 g· L-1) were sprayed on P.wna gii seedlings.The SA enhanced PAL, PPO, POD en-zyme activities of P.w angii seedlings , stimulated defense capabilities against diseases and pests , and promoted the growth and development of P.wangii seedlings.P.wangii seedlings showed significantly differences in the morphological indica-tors and activities of defensive enzymes in 0.5-1 g· L-1 compared with that of control .%为了克服毛枝五针松幼苗发育不良、根系细弱不发达、死亡率高等问题，采用营养袋育苗试验，用不同质量浓度的水杨酸（SA）溶液（0、0．25、0．50、1．00、1．50、2．00 g· L－1）喷洒毛枝五针松幼苗，研究不同质量浓度的SA溶液对毛枝五针松幼苗生长发育和针叶防御酶活性的影响。结果表明：SA增强了毛枝五针松体内的PAL（苯丙氨酸解氨酶）、PPO（多酚氧化酶）、POD（过氧化物酶）酶活性，激发毛枝五针松对病虫害的防御能力，促进了毛枝五针松幼苗的生长发育，且以SA质量浓度为0．50～1．00 g· L－1时，毛枝五针松幼苗的各形态指标和防御酶活性与CK差异显著（P ＜0．05）。