高温诱导黄瓜抗霜霉病机理

研究了高温对黄瓜霜霉病菌致病力的影响以及高温控制霜霉病发生的效果.结果表明，40 ℃高温处理2 h和45 ℃处理1 h对黄瓜霜霉病的诱导抗病性作用最明显，其在接种后4 d时的防效分别为58.40%和45.81%，到接种后6 d时，防效分别下降为39.35%和37.65%.经高温诱导后，过氧化物酶（POD）、苯丙氨酸解氨酶(PAL)、几丁质酶（Cht）、β-1,3-葡聚糖酶（Glu）活性均显著高于对照，与未诱导植株相比，高温诱导后叶片组织的细胞壁表面有大量木质素沉积，表明高温处理后黄瓜表现出对霜霉病的抗病性.

Mechanisms of high temperature-induced Pseudoperonospora cubensis resistance of cucumber

This paper studied the effects and control efficiency of high temperature on the pathogenicity and occurrence of Pseudoperonospora cubensis. The results showed that the P. cubensis resistance of cucumber was most obvious after treated at 40 degrees C for 2 h or at 45 degrees C for 1 h, with the control efficiency being 58. 40% and 45. 81% at the forth day, and 39. 35% and 37. 65% at the sixth day after P. cubensis inoculation, respectively. Under high temperature, the activities of peroxidase (POD), phenylalanine ammonia lyase (PAL) , chitinase (Cht), beta-1,3-glucanase (Glu) in cucumber leaf were significantly higher, and large amount of lignin was deposited on the cell wall of leaf tissue, indicating that after treated with high temperature, cucumber plant manifested an induced P. cubensis resistance.