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《Journal of Jilin Agricultural University》 2003-02
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Diurnal Changes of Photosynthesis of Panax quinquefolium Leaves under Invariable Environmental Conditions

XU Ke-zhang, ZHANG Mei-shan (1. Faculty of Biological Science, Nanjing Agricultural University, Nanjing, Jiangsu 210095; 2. College of Agronomy, Jilin Agricultural University, Changchun, Jilin 130118, China)  
In order to investigate the effect of the internal factors on the diurnal changes of photosynthesis in Panax quinquefolium, diurnal changes of photosynthesis and some physiological and biochemical characteristics of Panax quinquefolium leaves grown under artificial plant environmental chamber were measured. The results are as follows. Net photosynthetic rate(Pn) in the morning(8:00 - 11 :00) was higher than that in the afternoon(13:00 - 16:00) during a day, and showed daily depression. Daily depression percentage was in the range of 15% - 20% . Stomatal conductance ( gs) and transpiration rate (Tr) also showed daily depression like Pn. Daily depression of gs was higher than that of Tr, and gs showed similar change to that of Pn. Intercellular CO2 concentration ( Ci ) was increased in the afternoon (13:00 -16:00), which indicated that daily depression of Pn was not a stomatal limiting. Specific leaf weight (SLW, dry weight per unit leaf area) and starch content increased from morning to afternoon persistently, and they were significantly in negative relation with Pn . So it can be presumed that accumulation of photosynthetic products is an important internal factor in daily depression of Pn.
【CateGory Index】: S567.53
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