摘要： 疫霉菌侵染后辣椒幼苗叶片和根茎组织中PPO、POD和PAL活性发生变化.试验表明:除感病品种根茎部固有的POD活性较高以外,抗(耐)病辣椒品种幼苗叶片的PPO、POD和PAL及根茎部PPO和PAL活性高于感病品种.疫霉菌侵染后,仅根茎部PPO活性略有下降,各辣椒品种幼苗叶片和根茎组织PPO、POD和PAL均在接种后一度显著高于对照.抗(耐)病辣椒品种幼苗根茎部PAL活性接种 d升幅大且早,抗(耐)病品种体内固有的PPO、POD和PAL活性高,在辣椒抗疫霉菌反应中起了重要作用.

关键词: 辣椒疫病, 多酚氧化酶, 过氧化物酶, 苯丙氨酸解氨酶

Abstract: T he variation of activities of PPO, POD and PALwere analyzed in leaves and stems/roots of hot pepper seedlings after inoculated with Phytophtora capsici L.Higher constitutive PPO, POD and PALactivities were detected in uninoculated leaves and stems/roots of the resistant cultivars, except higher constitutive POD activities in uninoculated stems/roots of the susceptible cultivars.GeneraLspeaking, the three enzyme activities in leaves and POD in the stems/roots of alLtested cultivar seedlings were significantly higher:the most drastic enzyme reactions and the most enhancement of enzymes are that PPO, POD, PALactivities in the inoculated leaves and POD activities in the inoculated stems/roots of the high susceptible cultivars.T he enhancement of POD activities in the inoculated seedlings and PPO activities in the inoculated leaves of the resistant cultivars were much more than those in the susceptible cultivars, and less than in the high susceptible cultivars.An early and rapid increase of PALin inoculated stems/roots of the resistant cultivars were induced at 4 days after the in-oculation with the fungi, and higher constitutive PPO, POD and PALactivities in uninoculated leaves and stems/roots of the resistant cultivars may play an important role in pepper resistance to Phytophthora capsici L.

Key words: Phytophthora capsici L, Polyphenoloxidase, Peroxidase, Phenylalanine ammonia-lyase

中图分类号: 

• S601