在大田栽培条件下，以马铃薯（Solanum tuberosum L.）荷兰212为材料，叶面喷施不同植物生长调节剂，通过比较根体积、根鲜重、根干重的变化，根系活力，根系中多酚氧化酶、淀粉酶和抗坏血酸氧化酶活性的变化，研究了喷施植物生长调节剂对马铃薯根系理化特性的调控效应。结果表明：2-N,N-二乙氨基乙基己酸酯（DTA-6）对根系理化特性的影响较大，它可以有效地调控根系抗坏血酸氧化酶活性的变化规律，在喷药后24 d时，与对照相比，降低了根系的鲜重、体积、干重以及根系活力和淀粉酶活性。SOD模拟物（SOD_M）可以提高喷药24 d后的根系体积。氯化胆碱（Cc）对根系的形态指标略有影响，对根系活力、淀粉酶以及抗坏血酸氧化酶和多酚氧化酶活性的影响不明显。

Effects of spraying SOD simulation material (SOD_M), choline chloride (Cc) and diethyl aminoethyl hexanoate (DTA-6) on dry weight, fresh weight and volume of potato roots, and activities of polyphenol oxidase, ascorbic acid oxidase and amylase of potato roots were studied by conducting a field experiment. The potato cultivar is Holand-212 (Solanum tuberosum L.). The results show that great effects are obtained with the DTA-6 treatment, especially for controlling activity of polyphenol oxidase of potato roots. Root dry weight, volume, fresh weight and amylase activity are reduced on the 24^th day after the spraying. However, from the 24^th day after the spraying, root volume is increased under the SOD_M treatment, and under the Cc treatment, slight effects on physiological characteristics of potato roots are observed.