Physiological adaptation of invasive plant Erigeron philadelphicus to different environments
2008
HU Tian-yin | WANG Yong | YIN Li-ping | GUO Shui-liang
Erigeron philadelphicus is a new plant invader in the suburb of Shanghai. In order to understand better its physiological adaptability to different stresses, the relative membrane permeability, the concentrations of malonaldehyde (MDA), free proline, soluble sugar, and chlorophyll, as well as the activity of peroxidase (POD) of Erigeron philadelphicus were determined under different stresses during its vegetative growth phase. Compared with 5℃ and 22 ℃, the concentrations of MDA, free proline and chlorophyll, the activity of POD, and relative membrane permeability of E. philadelphicus were higher at 35 ℃. When treated with the solution of pH 7, its relative membrane permeability, concentrations of MDA, free proline and soluble sugar were lower than those with the solution of pH 10 or pH 4. With the increase of NaCl concentrations in soils, the contents of MDA, free proline and soluble sugar, together with the relative membrane permeability constantly rose. Furthermore, both the relative membrane permeability and the MDA content were distinctly positive correlation with NaCl concentrations in soils. According to the above data, the following conclusions could be drawn: ① Erigeron philadelphicus grows better at 5℃ than at 35 ℃; ② The neutral and moist soils are suitable for its growth, and either excessive acid (pH 4) or excessive alkali (pH 10) is harmful to its growth; ③ Erigeron philadelphicus has somewhat resistance to dry stress, and is sensitive to NaCl in soils, because the physiological indices such as MDA, free proline, and relative membrane permeability increase when it was planted in the soils of high NaCl content (>0.05 mol·L<sup>-1</sup>).
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