Specific ion effect as a probable cause of growth inhibition under saline conditions
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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 wordsAlkalinity Bicarbonate Carbonate Chloride Growth inhibition IAA pH Salinity Sulphate
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