中文摘要：

对大豆疫霉根腐病菌毒素胁迫下抗感不同大豆品种根、茎、叶中苯丙氨酸解氨酶（PAL）活性的变化规律进行了初步研究，结果表明：适宜浓度的毒素（稀释100倍，浓度为0．0897mg／mL）处理抗病大豆品种的根、茎和叶中苯丙氨酸解氨酶活性在病程的大部分阶段与对照相比都升高，而感病品种在整个病程中虽然在某些阶段较对照有一定的提高，但幅度不大，在病程其他阶段苯丙氨酸解氨酶下降幅度远大于升高幅度。而浓度相对较高的毒素（稀释50倍，浓度为0．1794mg／mL）处理后抗感品种根、茎和叶中苯丙氨酸解氨酶活性的变化较稀释100倍浓度毒素幅度小。

英文摘要：

Change of phenylalanine ammonia-lyase （PAL） activities among different resistance soybean varieties treated with pathotoxin from Phytophthora sojae was preliminarily studied in this paper. The results showed that the optimum concentration of pathotoxin （0. 0897mg/mL） led to higher PAL activities in resistant varieties than those of control variety during most stages of disease processing. Contrarily, susceptible varieties were possessed of medium high levels of PAL activities with a rapid declination only during few limited stages of the disease processing. However, treatment with high concentration of pathotoxin （0. 1794mg/mL） caused low levels of PAL activities in both resistance varieties and susceptible ones compared with treatment of the optimum concentration.