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甘薯（Ｉｐｏｍｏｅａｂａｔａｔａｓ）抗病品种＂湘薯６号＂和感病品种＂新种花１８３＂经薯瘟病原细菌（ＰｓｅｕｄｏｍｏｎａｓｓｏｌａｎａｃｏａｒｕｍＥ．Ｆ．Ｓｍｉｔｈ）的诱导，９０％甲醇提取后，用乙酸乙酯萃取和ＳｅｐｈａｄｅｘＬＨ－２０柱层析分离纯化得到４个吸收峰．经抑菌试验检测出＂湘薯６号＂的抑菌活性区在第２峰，而＂新种花１８３＂的抑菌活性区在第３峰．硅胶Ｇ２５４薄板层析法鉴定该提取物可能是植保素．紫外光谱、红外光谱分析表明该植保素的吸收峰与黄酮类化合物的特征吸收峰相似，可能属于黄酮类化合物．
Induction of Ipomoea batatum-resistant variety “Xiangshu 6” and susceptible variety “Xinhuahua 183” were induced by Pseudomonas sp.olactoneum E.F. Smith, extracted with 90% methanol, extracted with ethyl acetate and purified with Sephadex LH -20 column chromatography to obtain four absorption peaks. The bacteriostatic activity zone of “Xiangshu 6” was detected at the second peak by the bacteriostasis test, and the third peak was the “antibacterial activity zone of the new seed 183”. Silica G254 thin-layer chromatography identification of the extract may be phytoalexin. UV and IR spectra showed that the absorption peak of the phytoalexin was similar to that of flavonoids, which may belong to flavonoids.