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| Short-term Effect of Phloem Girdling on Water Potential and Photosynthetic Characteristics in Karelinia caspica |
| Tang Gangliang1,2, Li Xiangyi1, Lin Lisha1, Li Lei1,2, Lu Jianrong1,2 |
1. State Key Laboratory of Desert and Oasis Ecology/Cele National Station of Observation & Research for Desert-Grassland Ecosystem in Xinjiang, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi 830011, China;
2. University of Chinese Academy of Sciences, Beijing 100049, China |
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Abstract Plants grow in the southern edge of Taklimakan Desert in the growing season often suffer impact of pests and grazing. Our general objective was to know the effects of short-term phloem girdling disturbance on physiological parameters in Karelinia caspica. Specifically, we want to know the effect of different degrees of girdling on physiological parameters in K.caspica and provide the basic data for revealing the possible mechanisms of photosynthetic changes in K.caspica caused by girdling. So we set three different types of girdling: normal branch, moderate girdling, severe girdling, and observed responses of stomatal conductance, water potential, photosynthetic pigments, chlorophyll fluorescence parameters in K. caspica under the conditions of girdling after about 10 days. We found effect of different-degree-girdling on K.caspica were different. That is to say, the change of physiological parameters in K.caspica under moderate girdling is not obvious. However, severe girdling can significantly reduce stomatal conductance, predawn water potential and midday water potential, chlorophyll content and carotenoids content in K.caspica. The severe girdling also restrained the original photosynthetic reaction of K.caspica, and damaged the structure and function of PSⅡ under such conditions. The activity of PSⅡ declined after girdling. The processes of absorption, transmission, conversion and electron capture of light energy in photosynthetic organs ware also restrained. The energy used for dissipate will significantly increase. When faced with mechanical damage of phloem caused by insect and people, if the phloem is not completely damaged, plants may be able to make the function of physiological returned to normal through self-repair of tissue. While plant suffered severe damage may die. We should better avoid the phloem be completely eroded. There may a carbohydrate-independent mechanism in the effect of photosynthetic rate on K. caspica under the condition of girdling exist.
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Received: 25 July 2013
Published: 20 November 2014
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Corresponding Authors:
李向义(Email:lixy@ms.xjb.ac.cn)
E-mail: lixy@ms.xjb.ac.cn
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2014, Vol. 34 
