Relationship between photosynthetic activity and grain productivity in two winter wheat varieties of different breeding periods
Aim. Studies of the relationship between the components of ear grain productivity and flag leaf photosynthetic activity in the reproductive period in modern high-yielding variety Favorytka and old less productive variety Myronivska 808. Methods. The intensity of photosynthesis was determined using infrared gas analyzer GIAM-5M and chlorophyll content by spectrophotometer. Relationship between photosynthesis and productivity indices was evaluated by correlation analysis. Results. It was shown that the superiority in grain productivity of modern breeding variety Favorytka over the old one Myronivska 808 resulted from a combination of greater grain number per spike and higher photosynthetic activity during grain filling. Conclusions. Extending the active functioning of flag leaf in modern high-yielding varieties with high grain number per spike is necessary to ensure sufficient grain filling and realization of yield potential.
Keywords: Triticum aestivum L., photosynthesis, ontogeny, performance.