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Scientia Silvae Sinicae ›› 2015, Vol. 51 ›› Issue (9): 18-23.doi: 10.11707/j.1001-7488.20150903

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Establishment of The Estimation Model of K Content of Sambucus canadensis Root under Saline-Alkali Stress

Shi Huiqin1, Zhang Luosha2, Di Bao3, Li Baohui2, Zhang Qin1   

  1. 1. College of Landscape Architecture, Agricultural University of Hebei Baoding 071000;
    2. College of Forestry, Agricultural University of Hebei Baoding 071000;
    3. College of Horticulture, Agricultural University of Hebei Baoding 071000
  • Received:2015-07-31 Revised:2015-09-04 Online:2015-09-25 Published:2015-10-16

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Abstract:

[Objective] Sambucus canadensis was used as experimental material in this study.To simply and fastly predict K content in roots of Sambucus canadensis under salinity and alkalinity stress, salinity and alkalinity resistance of this plant roots was measured by electrical impedance spectroscopy (EIS) and electrolyte permeability methods and the estimation model of K Content of their roots was establish. [Method] The electrical impedance spectroscopy, cell membrane permeability and the change of K content in roots during different concentrations of salinity-alkalinity stress were studied. The corrections between EIS parameters and K content were analyzed using linear and nonlinear regressions. The estimation model was constructed using the best EIS parameter and the model accuracy was tested.[Result] During the salinity and alkalinity stress,compared with control,the K content of Sambucus canadensis roots treated by different concentrations of salinity-alkalinity significantly decreased(P≤0.05). As the extension of salinity-alkalinity stress time, the relative conductivity of the roots under different stress tended to rise and significantly increased compared with control(P≤0.05). The spectra of electrical impedance changed in roots of Sambucus canadensis during salinity-alkalinity stress; The EIS parameter τ was the best for assessing K content of root. The best model was y=0.005 5x3-0.232 8x2 +2.638 8x+ 15.877 with the precision accuracy of 91.73%.[Conclusion] The model y=0.005 5x3-0.232 8x2 +2.638 8x+ 15.877 with best precision accuracy constructed with EIS parameter τ can be used to fastly and accurately forecast K content in roots of Sambucus canadensis under salinity and alkalinity stress.

Key words: Sambucus canadensis, root, saline-alkali stress, electrical impedance spectroscopy, K content, relative electrolytic leakage, model building

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