剑叶龙血树树脂中的植物防卫素

Phytoalexins in Dracaena cochinchinensis resin.

１引言剑叶龙血树（Ｄｒａｃａｅｎａｃｏｃｈｉｎｃｈｉｎｅｎｓｉｓ）系龙舌兰科龙血树属，常绿乔木或灌木，在云南主要分布于勐连、勐腊、思茅、普洱、沧源、景东等县．在广西也有分布．剑叶龙血树现已成为我国传统中药血竭的主要基源植物之一［３］．近几年，对血竭化...

After the trunk of Dracaena cochinchinensis was separately inoculated with Fusarium graminum var. dracaena, F. graminum var. yunnanensis and Cladosporium carpophilum for 5～15 days, small red circles emerged around its inoculated positions and gradually enlarged with increasing days, and the redness also gradually became deep. Antifungal experiment and HPLC analysis confirmed that 7,4' dihydroxyflavan, 7 hydroxy 4' methoxyflavan and Loureirin A were the three phytoalexins which were extracted and identified from the red xylems.