【摘要】 以含对叶霉病不同抗性基因的番茄品种为材料,研究了叶霉病菌侵染过程中PAL酶活性和次生代谢物木质素含量的变化与品种抗性、病原菌生理小种间的相互关系。接种后苯丙氨酸解氨酶活性增加,抗病品种的PAL酶活性高峰出现早于感病品种。番茄品种的抗病性与其接种后36hPAL酶活性变化百分比呈极显著正相关(r=0 96 )。另外,还成功地利用PAL酶活性变化速度这一指标对叶霉病生理小种的变异进行了生化鉴定。更多还原

【Abstract】 Several varieties of tomato with different degrees of resistance to cladosporium fulvum were used to study the changes in phenylalanine ammonia lyase(PAL) activity and lignin conten as well as their correlationship with the resistance degree of varieties and pathogeny during inoculation.PAL activity increased through inoculation.PAL peaks appeared earlier in resistant varieties than those in susceptible ones.There was significant varieties correlation between the seedling resistance and the increase of PAL activity during 36 hours after inoculation(r=0.96**).The changing speed of PAL activity as a resistance index was applied successfully in identifying the differentiation in physiological varieties of Cladosporium fulvum.更多还原