Study On The Factors Related To The Accumulation Of Flavonioid And Terpene In Ginkgo Biloba Leaves

Environmental and genetic factors were studied by field experiments and pot experiments. Content of flavonoid and terpene content in leaves of Ginkgo biloba (L.) Siberian, half-Siberian families, and clones were tested in lab, and the results are as follows:Soil moisture affects the content of flavonid and terpene in G. biloba leaves. Drought stress favors for the accumulation of falvonid and terpene. Wet soil and flooded conditions has no advantages to improve the contents of flavonid and terpene. Soil moisture also affects the photosynthetic rate, pal activity and stem growth. *Solar radiation intensity is another environmental factor affects the flavonid content and terpene content. Treatment of sun shading favors the accumulation of flavonid and terpene, but dim condition has no benefit to the accumulation of flavonoid and terpene. Solar radiation indensity has an effect on PAL activity, photosystetic rate and stem growth, too.Light spectrum has effect on the accumulation of flavonoid and terpene. Long wavelength such as red light isn't of advantage to the accumulation of flavoniod and terpene, but advantage to the growth and development of growth. Short wavelength is converse. Light spectrum also affects the photosybnthesic rate, PAL activity and relative stem growth.Photoperiod has no significant effect on the content of flavonoid and terpene in G. biloba leaves. Short period of lighting is good for the photosynthetic rate and relative growth, but long time of lighting is converse.Different ethylene concentration affects the accumulation of flavonoid and terpente. High ethylene concentration favors to the accumulation of flavonoid and terpene, compare to the ck of water spraying. Photosynthetic rate, PAL activity and relative stem growth were also affected by various concentrations of ethylene sprayings.The content of flavonoid and terpene in Ginkgo biloba leaves among various families and clones is different, significantly. Genetic power of flavonoid content and terpene content in half-Siberian families is 0.42 and 0.53, and in clones is 0.80 and 0.65, accordingly. Photosynthetic rate, PALactivity and relative stem growth among families and clones is different, significantly, and their genetic power is higher, too.The environmental factor affects the content of flavonoid and terpene, photosynthetic rate, PAL activity and stem growth. Effect of different environmental factors features different regulations.The content of flavonoid and terpene of families and clones changes according to the photosynthetic rate, PAL activity and relative growth. And their regression coefficient is different between environmental and genetic factors.