研究了对羟基苯甲酸对菘蓝幼苗生长和生理指标的影响。结果表明，菘蓝幼苗的株高、茎叶鲜重、茎叶干重、根质量随对羟基苯甲酸处理浓度的增大呈先升高后降低的趋势；幼苗电解质外渗率、过氧化物酶(POD)、丙二醛(MDA)随着处理浓度的增大逐渐升高，过氧化物歧化酶(SOD)随处理浓度的增大呈先升后降的趋势。表明对羟基苯甲酸是菘蓝发生连作障碍并导致产量降低的重要因素之一。

The effects of p-hydroxybenzoic acid on the growth and physiological indexes of Isatis indigotica seedlings were studied. The results showed that the plant height， leaf fresh weight， stem and leaf dry weight and root mass of Isatis indigotica seedlings increased first and then decreased with the increase of treatment concentration. The electrolyte extravasation rate， POD and malondialdehyde (MDA) in the seedlings gradually increased with the increase of the treatment concentration， and SOD increased first and then decreased with the increase of the concentration. The results showed that p-hydroxybenzoic acid was one of the important factor in continuous cropping of Isatis indigotica.

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高 波(1985 — )，男，甘肃张掖人，助理农艺师，主要从事农业技术推广及利用研究。Email:370409789@qq.com。