Plant and Soil

, Volume 52, Issue 3, pp 457–459 | Cite as

Specific ion effect as a probable cause of growth inhibition under saline conditions

  • Ashok K. Shukla
  • B. D. Baijal
  • G. K. Chaturvedi
Short Communications

Summary

The replacement of carboxy-proton of IAA, plays an important role in the process of growth under saline conditions. Appreciable changes in pH have ben observed in the presence of CO3−2 and HCO3, and increase in pH appears to be caused owing to the formation of unstable complex of IAA, which soon hydrolyzes and gives alkalinity. The pH change thus achieved favours IAA oxidase activity; therefore, suppression of growth is resulted in CO3−2 and HCO3 medium. In the presence of SO4−2 and Cl salts slight lowering of pH takes place which does not favour IAA oxidase activity. It is therefore, presumed that anion (CO3−2, HCO3, SO4−2 and Cl) controls the process of growth and development through the alteration of pH of the medium.

Key words

Alkalinity Bicarbonate Carbonate Chloride Growth inhibition IAA pH Salinity Sulphate 

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References

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    Gorden, W. R. and Henderson, J. H. M. 1973 Can. J. Bot.51, 2047–2052.Google Scholar
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    Levitt, J. 1972 Response of plants to environmental stress. Physiological Ecology. Acedemic Press, pp. 697.Google Scholar
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    Shukla, A. K. and Baijal, B. D. 1977 Indian J. Plant Physiol.20, 157–160.Google Scholar
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    Willard, H. H. et al. 1963 Instrumental Methods of Analysis. Van Nostrand Comp. INC. Princeton pp. 474.Google Scholar

Copyright information

© Martinus Nijhoff 1979

Authors and Affiliations

  • Ashok K. Shukla
    • 1
  • B. D. Baijal
    • 1
  • G. K. Chaturvedi
    • 1
  1. 1.Botany DepartmentAgra CollegeAgra

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