Effect of Solution Phosphorus Concentration on the Exudation of Oxalate Ions by Wheat (Triticum aestivum L.)

A solution culture experiment was conducted to investigate the effect of solution phosphorus concentration on the exudation of citrate and oxalate ions by five different varieties of the wheat (Triticum aestivum L). Wheat varieties were grown in a modified Hoagland nutrient solution containing five phosphorus levels (0, 0.2, 0.3, 0.4 and 0.5 mu g/mL). Increasing the concentration of P significantly decreased oxalic acid exuded from roots. The exudation of oxalic acid was maximum at 10 days time interval. All the varieties of wheat were equally effective in exudating oxalic acid. The time interval had no significant effect on P concentration in plants. But significant interactive effect on plant P was found between varieties and different time intervals. Five levels of solution phosphorus (0, 0.2, 0.3, 0.4, 0.5 A mu g/mL) affected the oxalic acid secretion in wheat crop. The concentration of oxalic acid decreased with the increased levels of phosphorus concentration. In phosphorus stress condition wheat seedling secreted higher amount of oxalic acid.