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检测了不同抗病类型甘蔗品种受黑穗病菌（ＵｓｔｉｌａｇｏｓｃｉｔａｍｉｎｅａＳｙｄ．）侵染后苯丙氨酸解氨酶（ＰＡＬ）、酪氨酸解氨酶（ＴＡＬ）、４—香豆酸辅醇Ａ连接酶（ＣｏＡｌｉｇａｓｅ）活性以及绿原酸和黄酮类化合物含量的动态变化．结果表明：受病菌侵染后各品种的ＰＡＬ、ＴＡＬ、ＣｏＡｌｉｇａｓｅ比活性均有一个明显的消长过程，但高抗品种ＮＣｏ３７６、“ＲＯＣ”１０酶活性上升的幅度和持续时间显著大于高感品种Ｆ１３４、ＦＮ８３—０７０６；同时，与高感品种相比．高抗品种绿原酸与黄酮类化合物的累积时间早，累积量也明显增加．因此，我们认为甘蔗黑穗病菌诱导ＰＡＬ、ＴＡＬ、ＣｏＡｌｉｇａｓｅ活性提高，增强了合成绿原酸、黄酮类化合物等多种抗病次生物质的苯丙烷类代谢，这可能是甘蔗对黑穗病侵染后抗性（Ｐｏｓｔ－ｉｎｆｅｃｔｉｏｎａｌｒｅｓｉｓｔａｎｃｅ）机制的一个重要方面．
(PAL), tyrosine ammonia-lyase (TAL), 4-coumarate-CoA ligase after inoculation by Ustilagoscitamine aSyd. (CoAligase) activity as well as the dynamic changes of chlorogenic acid and flavonoid content. The results showed that PAL, TAL and CoAligase specific activities of all the cultivars were all obviously decreased after inoculation. However, the amplitudes and durations of the activities of NCo376 and ROC10 were significantly higher than those of the susceptible cultivar F134 , FN83-0706; the same time, compared with the high susceptibility varieties. High-resistant varieties of chlorogenic acid and flavonoids accumulated earlier, the cumulative amount also increased significantly. Therefore, we think that the pathogen PAL, TAL and CoAligase induced by the pathogen of sugarcane smut promoted the metabolism of phenylpropane in the secondary pathogens such as chlorogenic acid and flavonoid, Post-infection resistance is an important aspect of the mechanism.