Relationship Between Net Photosynthetic Rate and Total Flavonoid Content of Different Ginkgo biloba L. Varieties

Using the leaves of Ginkgo biloba L. as sample,net photosynthetic rate and total flavonoids content were tested by photosynthesis system and spectrophotometry respectively. The results showed that there were significant difference of net photosynthetic rate and total flavonoids content among different Ginkgo biloba L. varieties. There was a certain linear relationship between net photosynthetic rate and total flavonoid content, but the relationship was not obvious.Generally,the Ginkgo biloba L. variety with high net photosynthetic rate also had high flavonoid content.It was reasonable to select the Ginkgo biloba L. varietiy with high net photosynthetic rate for leaf use.