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| Responses of leaftemperature and characteristics of chlorophyll fluorescence of Platycladus orientalis to soil water stress |
| Dong Guo1, Dai Meng1, Zhao Yong1, Li Jianzhong2, Hou Na1, Song Xiaoming1, Fan Wei3 |
1.Henan Agricultural University, 450002, Zhengzhou, China;
2.Dagou-he National Forest Farm, 454650, Jiyuan, Henan, China;
3.Henan Forestry Academy, 450003, Zhengzhou, China |
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Abstract In the hilly areas of Tai-hang Mountains, drought stress is a crucial factor limiting the survival and growth of plants. Detailed knowledge about the responses of Platycladus orientalis with different water treatments (i. e. well-watered, mild drought stress, moderate drought stress, and severe drought stress) to water stress would benefit us for the success of re-vegetation programs. The cholorophyll fluorescence parameters and leaf temperature of potted P. orientalis were measured experimentally. Prolonged severe drought stress increased the temperature, the non-photochemical quenching coefficient and decreased the max fluorescence (Fm ), the variable fluorescence (Fv ), the maximum quantum efficiency of PSⅡ photochemistry (Fv / Fm), potential photochemical efficiency (Fv / F0 ), the actual photochemical efficiency and the electron transport rate. The basis fluorescence (F0) exhibited a rising trend. The daily variation of the actual photochemical efficiency, the electron transport rate and the non-photochemical quenching coefficient were regular at different degrees of water stress. The curves of daily variation of the actual photochemical efficiency were concave in P. orientalis with heavier degree, while the curves of daily variation of the electron transport rate and the non-photochemical quenching coefficient were approximately unimodal at different degrees of water stress.
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Received: 21 March 2013
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