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Strain response of Na_2CO_3-stressed Puccinellia tenuiflora to time and intesity of stress

YIN Shang jun 1, SHI De cheng 2, YAN Hong 2 (1. Zhejiang Teachers’ College of Agricultural Technology, Ningbo 315001; 2. Northeast Normal University, Life Science college, Changchun 130024)  
The plants of Puccinellia tenuiflora were stressed with 0~200 mmol/L Na 2CO 3 solutions and the changes in some important strain indices were investigated with time and intensity of stress. The results indicated that the total content of organic acids and the contents of citric acid, proline and Na + were increasing rapidly after Na 2CO 3 treatment, with a fast decrease in the contents of water, K + and in the ratio of K +/Na +. All the changes reached their maximum extent in some 48 hours after the treatment, then become steady. The critical concentration of Na 2CO 3 needed to induce a strain response varied among indices, e.g. 50 mmol/L was enough to cause an obvious accumulation in proline, while 125 mmol/L was needed for an obvious result in citric acid.
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