Internal stem features of spring wheat varieties as factors determinig resistance to lodging

Using the anatomical method, the study of the main parameters of the internal stem structure of Russian spring bread wheat varieties was performed in order to assess their impact on resistance to lodging.An increase in the number of parenchyma vascular bundles from top to bottom was established.The decrease in the diameter of the vascular bundles is compensated for by an increase in their number.The diameter of vascular bundles in the internodes had a slight effect on resistance to lodging.The relationship between the numbers of bundles and stem diameter in both interstices was traced.Resistance to lodging correlated with the number of vascular bundles and the length of the internode EN1 and EN2.The number of vascular bundles, stem diameter and thickness of the primary cortex contribute to a high productivity of the ear.The study of anatomo-morphological traits allowed us to identify the cultivars 'Novosibirskaya 31' , 'Velut' and 'Bel' , which may be of interest for breeding for resistance to lodging.