Photosynthesis of flag and second wheat leaves during senescence

The aim of this work was to define photosynthetic capacity of youngest whea t leaves, flag leaf and the leaf below it, during the period of anthesis an d grain filling. Fourteen tetraploid and hexaploid wheat cultivars were use d in order to study the effect of genotype on the photosynthetic O-2 evolut ion, quantum yield and leaf area duration. Significant variations among the genotypes and between the examined leaves were most apparent towards the e nd of vegetation. Correlations between most of the examined photosynthetic parameters and yield were not significant. Post-anthesis duration of photos ynthesis showed to be one of the grain yield determinants.