Photosynthetica, 2013 (vol. 51), issue 2

Photosynthetica 2013, 51(2):252-258 | DOI: 10.1007/s11099-013-0013-6

Diurnal changes in photosynthesis and antioxidants of Angelica sinensis as influenced by cropping systems

X. H. Zhang1,2,3, D. Y. Lang4, E. H. Zhang2, C. C. Bai1, H. Z. Wang2
1 College of Pharmacology, Ningxia Medical University, Yinchuan, China
2 College of Agronomy, Gansu Agricultural University, Lanzhou, China
3 Ningxia Engineering and Technology Research Center for Modernization of Hui Medicine, Yinchuan, China
4 Laboratory Animal Center, Ningxia Medical University, Yinchuan, China

Diurnal dynamics of photosynthetic character of Angelica sinensis, as well as effect of continuous cropping on leaf photosynthetic character, antioxidant enzyme activity and growth of A. sinensis were investigated under field condition. The results showed that the diurnal net photosynthetic rate of A. sinensis in sunny day exhibited a double-peak pattern, and the peaks occurred at 9:45 and 16:45 h, respectively. There was a significant midday depression with A. sinensis, which was caused principally by stomatal factors such as stomatal conductance. The results also showed that net photosynthetic rate (P N), transpiration rate (E), stomatal conductance (g s), intercellular CO2 concentration (C i), and chlorophyll content (Chl) of A. sinensis plants under continuous cropping were significantly lower than those of the control. The activity of total superoxide dismutase (SOD), peroxidase (POD) and catalase (CAT), and growth parameters of A. sinensis plants were significantly decreased under continuous cropping condition. This study provides evidence of continuous cropping obstacle effect on photosynthesis, antioxidant enzyme activity, and growth parameters of A. sinensis in a field experiment, which partly explained the yield reduction of A. sinensis in the field, when it was cultivated continuously on the same soil.

Keywords: Angelica sinensis; antioxidant enzyme activity; continuous cropping; growth parameters; photosynthesis

Received: August 17, 2011; Accepted: September 30, 2012; Published: June 1, 2013Show citation

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Zhang, X.H., Lang, D.Y., Zhang, E.H., Bai, C.C., & Wang, H.Z. (2013). Diurnal changes in photosynthesis and antioxidants of Angelica sinensis as influenced by cropping systems. Photosynthetica51(2), 252-258. doi: 10.1007/s11099-013-0013-6.
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