Physiological studies on the influence of salinity and alkalinity I. changes in growth, respiration, carbohydrates and fats during seedling growth of radish (Raphanus sativum L.)

Influence of salinity (NaCl) and alkalinity (Na₂CO₃) on radish seedling growth and on some aspects of metabolism were investigated. Growth studies were made with two concentrations of both NaCl (0.5 and 1.0%) and Na₂CO₃ (0.1 and 0.25%) treatments. The results revealed that with increased concentration of the salt solution there was a reduction in the absorption of moisture in both cotyledons and embryonic axis, a decrease in the loss of dry matter, stunted growth of the seedling and less formation of rootlets. Of the two salts, Na₂CO₃ (0.25%) was found to be more toxic. In the treated seedlings the rate of oxygen uptake was lowered. A delayed translocation of carbohydrates and fats from cotyledons to embryonic axis was also seen under salt treatments. The results obtained are discussed in the light of the available literature.