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《Acta Botanica Boreali-occidentalia Sinica》 2005-02
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Histochemical Localization and Seasonal Change of Ginsenoside in Herb Tea (Gynostemma pentaphyllum)

LIU Shi-biao~(1,2),HU Zheng-hai~(1*) (1 Institute of Botany, Northwest University, Xi'an 710069,China;2 Institute of Ecology, Jishou University, Jishou,Hu'nan 416000,China)  
Histochemical technique and phytochemical methods were applied in the studies on the distribution and accumulation of ginsenosides in the tissues of Gynostemma pentaphyllum,a medical herb, whose buds, young stems and leaves were processed as Longxu tea. Seasonal changes of total gypenosides in the health tea was also detected. The results indicated that ginsenosides showed color reaction from purple to light red if met special chromogenic agents, and the shade of color showed a positive correlation to the contents of ginsenosides in vegetative organs. Ginsenosides distributed mainly in mesophyll tissue in leaf, and external phloem parenchyma cells in stem, much less in assimilating tissue, collenchyma and epidermis in stem, no accumulation in xylem and pith parenchyma. The contents of total gypenosides in Longxu tea increased in the harvest period from the lowest in Apr. to the highest in Sept..There was a significant positive correlation between the contents of gypenosides and the monthly total precipitation. It is suggested that the quality tea should be harvested and process after Aug. when the climate is wet and cool.
【Fund】: 陕西省自然科学基金资助项目 (2003C113) ;; 湖南省自然科学基金资助项目 (04JJ3071 )
【CateGory Index】: S571.1
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