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| Circadian Variations and Regulation Mechanism of Eco-physiological Characteristics of Artemisia ordosica and Caragana korshinskii |
| Chen Dong1,2, Zhou Haiyan1, Li Peiguang3, Chen Yongle1,2, Wang Yanli1,2, Zhao Xin1 |
1. Shapotou Desert research and Experiment Station/Extreme Stress Resistance and Biotechnology Laboratory, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000, China;
2. University of Chinese Academy of Sciences, Beijing 100049, China;
3. Xishuangbanna Tropical Botanical Garden, Chinese Academy of Sciences, Kunming 653300, China |
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Abstract This paper studied the circadian variation characteristics of photosynthetic physiology, water physiology, and osmoregulation substance in root, stem and leaf of two excellent sand-fixation plants Artemisia ordosica and Caragana korshinskii. The results indicated that, relative humidity recovered sharply during the night, and the leaf temperature difference was higher than air temperature difference between day and night. Plant showed photosynthesis during the day, and respiration during the night. Both photosynthesis and respiration of A. ordosica was higher than that of C. korshinskii, the photo inhibition caused by photosynthesis in daytime can recovered quickly at the sunset time. Stomatal conductance and transpiration rate were in greater fluctuation in daytime than that at night. In the daytime, the amplitude of accomodation of A. ordosica was higher than that of C. korshinskii, and it also can keep a certain stomatal aperture at night. Water content in root and twigs water potential of A. ordosica were always higher than that of C. korshinskii, but water absorption ability in root of A.ordosica was lower than C. korshinskii at night. The soluble sugar content in root, stem and leaf of A. ordosica was higher than that of C. korshinskii, and the soluble sugar content in leaf of A. ordosica would be largely transmitted to root at night. The proline content in root, stem and leaf of C. korshinskii was higher than that of Artemisia ordosica, and the proline content in root and leaf of A. ordosica would be accumulated a lot at night. All of the above showed that, the adjustment of plant physiological activities at night played a certain role in enhancing plant stress resistance at noon.
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Received: 03 July 2015
Published: 20 November 2015
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2015, Vol. 35 
