不同品种及生长期甘薯叶片多酚和黄酮含量动态分析

Dynamic Analysis of Polyphenols and Flavonoids in Sweet Potato Leaves of Different Cultivars and Growing Stages

比较了不同品种及生长期甘薯叶片中多酚和黄酮含量动态及差异性,结果表明,不同品种及同一品种不同生长期叶片多酚和黄酮含量均呈显著差异(P<0.05)。其中多酚和黄酮含量分别以徐紫薯6号和漯薯11为最高,分别达到43.79 mg/g和23.67 mg/g。威薯7号、苏薯25和岩薯5号3个品种均在9月上旬多酚含量达到最高值,威薯7号和岩薯5号在9月初黄酮含量达到最高值,苏薯25在9月底黄酮含量达到最高值,其余品种甘薯叶片中多酚、黄酮平均含量均在8月中旬最高,其次为9月底,推荐9月底为最佳采收期。相关分析表明,不同生长期甘薯叶片多酚与黄酮含量呈显著正相关(r=0.903,P<0.05)。

The dynamic content levels and differences of polyphenols and flavones in leaves were analyzed and compared. The results showed that the contents of polyphenols and flavones in leaves of different cultivars and the same cultivar at different growth stages were significantly different(P<0.05). The highest contents of polyphenols and flavonoids were Xuzishu 6 and Luoshu 11 respectively, reaching 43.79 mg/g and 23.67 mg/g respectively. The content of polyphenols in Weishu 7, Sushu 25 and Yanshu 5 reached the highest value in early September, the content of flavonoids in Weishu 7 and Yanshu 5 reached the highest value in early September. The flavonoid content of Sushu 25 reached its highest value at the end of September. The average contents of polyphenols and flavones in leaves of other sweet potato varieties were the highest in mid-August, followed by the end of September, and the best harvest time was recommended at the end of September. The correlation analysis showed that there was a significant positive correlation between polyphenols and flavonoids content in leaves of Sweet Potato at different growth stages(r=0.903, P<0.05).