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《植物学报(英文版)》 1992-05
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STRAIN RESPONSES IN NaCO_3-STRESSED LEYMUS CHINENSIS SEEDLINGS AND THEIR MATHEMATICAL ANALYSIS

Shi De-cheag Yin Li-juan (Grassland Research Institute,Northeast Normal University,Changchun 130024)  
The seedlings of Leymus chinensis were Na_2CO_3-stressed for 6 days by planting in various culture solutions containing 1.25—30mmol/L Na_2CO_3.Nine strain indexes, such as the relative growth inhibition rate etc.,were determined.The growth was obviously inhibited;the Na+ content was rapidly increased and K~+content was gra dually decreased;great amount of proline and citric acid was accumulated;the leakage rate of electrolyte was elevated;the content of chlorophyll was reduced;the activities of both photosynthetic carboxylases RuBPCase and PEPCase were reduced and the ratio of PEPCase activity/RuBPCase activity became great eventually,as the reductio of RuBPCase activity was much more than PEPCase.Mathematice an- alyses of the experimental data for relationships between the strain indexes and str- ess(in natural logarithm of molar concentrations of Na_2CO_3)revealed sigmoidal or inverted sigmoidal relationships which can be expressed by the equation Y=Y_m/ [1+Ke~(-(ax~2+bx))]+C or its varied forms(Y.strain value;Ym.maximum strain value;X.stress value viz.In molar concentration of Na_2CO_3;K,a,b,C.parameters).
【Fund】: 国家重大自然科学基金
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