银杏叶片色素含量与黄酮含量关系的研究Ⅱ.叶黄酮与叶绿素组成、比例及类胡萝卜素的关系

The Relationship between the Flavonoids and Pigments in Ginkgo biloba Leaf Ⅱ.The relationship between the flavonoids and chlorophyll composition, ratio of chlorophyll a and chlorophyll b, and carotenoids

:1 999年对银杏极短枝叶中叶黄酮、叶绿素组成及类胡萝卜素含量进行了全周期的测定分析 ,结果表明 :类胡萝卜素含量早期迅速上升 ,于 6月 1 3日达到全年最大值 ,此后含量下降 ,在 1 0月中旬降解加快。叶绿素中以叶绿素a为主 ,叶绿素总量与叶绿素a含量变化曲线之间r =0 .996 4 ,相关达极显著水平。叶绿素a/b值介于 2 .1 0～ 5.77之间 ,前期高 ,后下降到 6月中旬后保持在较稳定的水平 ,类胡萝卜素与叶绿素比值变化趋势与之正好相反。叶黄酮与叶绿素、类胡萝卜素、叶绿素a及叶绿素a/b值呈显著或极显著负相关 ,偏相关分析中只与叶绿素a/b值之间负相关达显著水平。

The contents of flavonoids, chlorophyll and its composition, and carotenoids in Ginkgo biloba phyllome branch leaves were examined during the whole growth and development period of the leaves in 1999. The results indicated that the carotenoid content rose very quickly and reached the highest value on June 13, and then decreased. The decrease speeded up in the middle of Oct. The chlorophyll a content accounted for the majority of total chlorophyll content, with a much significant correlation (r=0.996 4 ** ) between them. Chlorophyll a/b value with a scope of 2.10～5.77 was higher in the early stage, then decreased, and finally remained at a relatively constant level from the middle of June. The change trend on the ratio of carotenoids and chlorophyll was opposite when it was compared with chlorophyll a/b value. There were significant negative correlations between the flavonoids and chlorophyll, and chlorophyll a, and chlorophyll a/b, and carotenoids apiece. However, only a negative significant correlation between the flavonoids and chlorophyll a/b existed with the help of partial correlation.