|
|
|
| Physiological response of three broadleaved tree species to drought stress and evaluation of drought resistance |
| Forestry College of Shandong Agricultural University, Shandong Provincial Key Laboratory of Soil Erosion and Ecological Restoration, 271018, Tai'an, Shandong, China |
|
|
|
|
Abstract The two years Acer mono Maxim. , Ailanthus altissima Swingl. and Pistacia chinensis Bunge's physiological parameters such as malondialdehyde (MDA), superoxide dismutase (SOD) activity, cell membrane permeability, leaf relative water content, chlorophyll, proline content, photosynthetic were measured by potting experiment. The physiological response of the three broadleaved tree species to soil drought stress was analyzed, and the drought resistance was evaluated by subordinate function. The results showed that: with the development of drought stress, the MDA, cell membrane permeability and proline content of the three tree species increased, while leaf relative water content and net photosynthetic rate decreased; Acer mono Maxim. and Ailanthus altissima Swingl. 's SOD activity rose at first, and then dropped, while Pistacia chinensis Bunge's SOD activity rose at first and then dropped, at last rose again;Acer mono Maxim. and Ailanthus altissima Swingl. 's chlorophyll content rose at first and then dropped,while Pistacia chinensis Bunge's chlorophyll content had no distinct variation between pretest and posttest. Ailanthus altissima Swingl. and Pistacia chinensis Bunge's water use efficiency of leaf dropped at first and then rose ,at last dropped again, while Acer mono Maxim. 's water use efficiency of leaf rose at first, and then dropped. The subordinate function was used to rank their drought tolerance, and the order was: Ailanthus altissima Swingl. > Pistacia chinensis Bunge > Acer mono Maxim. . We knewproline, SOD and leaf relative water content were the key indicators to evaluate the drought resistance of the three tree species by grey correlation analysis.
|
|
Received: 14 July 2012
|
|
|
|
|
|
|
