THE GENOTYPIC DIFFERENCES IN RESPONSE OF WHEAT ROOT SYSTEM TO LOW-PHOSPHORUS STRESS

Wheat genotypic differences were studied in solving tricalcium phosphatase, excreting acid phosphatase and redox activity in rhizosphere in hydroponics, in situ visualization. Phosphorus influx kinetics was genotypically compared as well in ion depletion technique. The efficient genotypes such as Lovrin 10 won a marked advantage over the inefficient ones such as Chinese Spring not only in root morphology but also in physiology and biochemistry: amount of solving tricalcium phosphate, excretion and activity of acid phophatase, oxygenation capacity of reduced methylene blue (MEB), reducing ability to 2,3,4-triphenyl tetrzolium chloride (TTC), Imax among P influx parameters etc. Moreover, 25%~30% higher in excretion of organic carbon from the root and 97.41%~151. 10% quicker rate of Ca influx were both very important characters of effcient genotypes.