秋冬季节柿属植物树体内酚类物质含量的变化

本测试结果表明 ,原产日本中部的栽培柿‘富有’(Diospyros kaki cv.Fuyou)的抗寒性为 (- 2 5±0 .7)℃ ,而原产于亚热带台湾的台东豆柿 (D.taitoensis)的抗寒性仅为 (- 18± 0 .6 )℃。试材枝内酚类物质总含量在 9～ 11月中旬上升至最大值 ,富有柿增加了 0 .7倍 ,台东豆柿增加了 0 .8倍。此后至 2月中旬维持在较高水平 ,3月中旬以后迅速下降。 9～ 11月中旬富有柿枝内黄酮类物质含量显著上升了近 4倍 ,台东豆柿增加了近 1倍 ;此后至 2月中旬维持在较高水平 ,3月中旬以后迅速下降。 2树种枝条皮层中的酚类物质总含量分别为其木质部的 5倍左右。酚类物质的大部分为缩合型单宁 ,其含量变化曲线近似于酚类物质总含量的曲线。试材枝内简单酚类物质和可溶性单宁含量极低 ,且在秋冬季节无显著变化。与富有柿相比 ,台东豆柿枝内酚类物质中简单酚类物质比例高 ,而缩合单宁含量所占比例较低。结果显示 ,柿属植物树体内酚类物质组成及含量与其抗寒力的获得有一定关系

Change of Phenols in Persimmon During Autumn and Winter

Experiments were conducted to investigate the phenols content and cold resistance of Diospyros kaki distributed in Japan and D.taitoensis distributed in subtropical Taiwan. The results showed that lethal temperature to D.kaki was (-25±0.7)℃，and the lethal temperature to D.taitoensis was (-18±0.6)℃. The content of total phenols increased from September and reached its peak level in mid-November (0.7 times and 0.8 times increased respectively in D.kaki and D.taitoensis) and then decreased from mid-February. The content of flavonoids increased 4 times and 1 time respectively in D.kaki and D.taitoensis from mid-September to mid-November, and then decreased from mid-February. The contents of total phenols in cortexes were 4 times higher than that in xylem. The largest amount of phenols was condensed tannins, and its changes were the same as changes in total phenols. The content of simple phenols and hydrolyzable tannins were very low and their variations were not significant during autumn and winter. The rate of simple phenols to total phenols in D.taitoensis was higher than that in D.kaki, but the rate of condensed tainnins to total phenols in D.taitoensis was lower than that in D.kaki.