Net photosynthesis and ear grain content in the varieties of spring wheat under the influence of donor-acceptor relations

With the use of developed graphical method for the estimation of genotypic resistance of plants to stress (factor of stress is the deletion of two upper leaves at the period of ear formation, net photosynthesis was estimated on total air-dry mass of top) from broad spectrum of spring soft wheat varieties the authors isolated the agroecotypes with optimal combination of morphological determinants, permitting to form the increased yield, that can be used for genetic improvement of attract ability of wheat ear.