The root vigor and CAT activity of Nicotiana tabacum cv. 'Samsun NN ' inoculated TMV were investigated in differenttime. The result showed that within one month, CAT activity value of its root system and sampling time had a strong negativecorrelation (r = -0.9, p <0.01). The root vigor of its root system were abruptly increased first, and later decreased to the trend ofsmooth.%漂盘培育枯斑三生烟,苗期接种TMV后3、7、11、15、19、23、27、31d分别取样测定其根系的活力和过氧化氢酶活性,并以未接种TMV烟苗根系活力和过氧化氢酶活性为对照.结果表明,枯斑三生烟接种病毒后,其根系CAT活性值与取样时间有较强的负相关性(r=-0.9,p＜0.01).根系活力最初迅速升高,之后又逐渐降低呈平稳趋势.
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