The genotypic differences in P uhtization efficiency,
photosynthetic rate, wateruhlization efficiency and resistance to aging
were studied in hydroPonics and a fieldtrial. The results showed that chlorophyll content and CO2 fixation rate of theP-efficient genotypes were 32.0% and 26.0% higher than those of the p-inefficientones.Howevef,the latter's transpiration rate was 130.0% higher than that of the former's.Subsequetly, the
water content in rhizospheric soils of the p-efficient ones was56.5% higher than that of the P-inefficient ones. Malondialdehyde (MDA) content inthe leaves of the former was 75.0% lower than that of the latter. This indicated thatthe P-efficient ones were more resistant to aging than the p-inefficient ones underlow P stress. All the genotypes' P utilization efficiencies were raised significantlyunder the stress condition. The values were increased from 171.5 (full P strength) to1136.4 for the p-efficient genotypes and from 200.0 to 331.1 kg DM / kg P for thegenotypes from the other type. These suggested that light and water utilizationefficiencies and resistance to aging related closely to the efficiency of phosphorusuhlization by wheat genotypes.