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Journal of Tea Science ›› 2004, Vol. 24 ›› Issue (1): 65-69.doi: 10.13305/j.cnki.jts.2004.01.013

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Effect of Cadmium Ions on Photosynthetic Structure and Its Functions of Tea Leaves

SU Jin-wei1, WANG Xiang-Ping2   

  1. 1. College of Life Science;
    2. Test Centre, Fujian Agriculture and Forestry University , Fuzhou 350002, China
  • Received:2003-07-31 Revised:2004-01-23 Online:2004-03-25 Published:2019-09-11

Abstract: Tea plant was cultivated in Hoagland nutrient solution containing 0.5βmmol/L Cd2+ for 8 days. Tea leaves lost their green color gradually with the change in the ultrastructure of the chloroplast . At the early stage, there was a slight decrease in the number of granum thylakoids. Then, the thylakoids piled up loosely, and chloroplasts rounded off to different extents. At the late stage , the structure of the chloroplast related to thylakoid became unclear, while the thylakoid system was disintegrated abnormally with a few single bent and swell thylakoids, and some ruptured envelope of chloroplast. Cadmium ions significantly inhibited the photosynthesis activity and led to the decline in the chlorophyll content and chlorophyll a/b ratio. Further more the photochemical efficiency of PSII(Fv/Fm)and the potential activity of PSII(Fv/Fo)decreased in different degrees with increasing Cd2+ stress . The pollution duration resulted in the damage of photosynthetic structure in tea leaf cells.

Key words: Camellia sinensis, Cadmium ions, Chlorephyll fluorescence kinetics, Photosynthesis, Ultrastructure

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