Physiological Response and Adjustment Mechanism of Reaumuria soongorica and Salsola passerina to Extreme Environment
Reaumuria soongorica and Salsola passerine have significant differences in ecophysiological characteristics,and they change with environmental variation although they live together for a long term.Their adaptive mechanisms to environmental stresses are very different.As two extreme xerophytes,Reaumuria soongorica and Salsola passerina differ significantly from other psammophytes in ecophysiological characteristics;they can survive in lower water potential,even grow in the piedmont area.Low water potential may be related to the existence of osmosis-regulating substance,such as proline,which can strengthen their water absorption capacity.Compared to other psammophytes,Reaumuria soongorica and Salsola passerina have higher degree of photo-inhibition under same condition,and photo-inhibition can lead to destruction of the photosynthetic pigment,nevertheless,the photo-inhibition can be repaired under suitable conditions in the morning and evening.
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