摘要
黄瓜幼苗经水杨酸处理后 ,POD、PPO、PAL 3种酶活性均有不同程度的变化 ,与对照相比 ,POD活性在处理后 2 4h有明显提高 ,以后一直呈上升趋势 ,至 14 4h后较对提高 193 0 %。PPO活性变化相对较小 ,酶活性的明显提高在处理 4 8h以后 ,处理后 14 4h时较对照提高 6 1 7%。PAL在处理后 72h时出现一个小的酶活性峰 ,较对照提高 17 6 % ,而后下降 ,12 0h出现第 2个活性峰 ,较对照提高 30 8%。处理后 4d接种霜霉病菌 ,调查结果表明 :第 1真叶处理较对照病情指数降低 8 9% ,第 2真叶处理较对照降低 2 2 1%。
Cucumber seedlings were treated with SA at two leave stage with one real leave expanded and the other real leave unexpanded.The activity of POD,PPO and PAL changed in different level after treatment.The activity of POD changed obviously at 24 h after treatment,and increased steadily,till 144 h after treatment it increased 193% as compared with control.However the changes of PPO activity were less than that of POD.The activity of PPO increased by 61.7% 144 h after treatment.The PAL activity reached a little peak 72 h after treatment and then declined,another peak appeared in 120 h after treatment.Inoculation with Pseudoperonospora cubensis 4 d after treatment,the results show that the disease index of the first and the second real leaves were reduced by 8.9% and 22.1% respectively.
出处
《华北农学报》
CSCD
北大核心
2000年第2期118-122,共5页
Acta Agriculturae Boreali-Sinica
