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Resistance to stem lodging depends on the year conditions. The agro-climatic factors of the north-east of the European territory of the Russian Federation are unstable in terms of precipitation and temperature. Most of all, oat lodges in wet years, which is associated with an increase in plant length. To study the main morphological characters, the linear parameters of the stem and the indices of resistance to lodging were measured. The distribution of varieties and lines by plant length allowed to analyze the stem morphological parameters for each group. The main contribution to the length of plants is made by the upper and second internodes. A smaller proportion is accounted for by the length of the lower internode. The dependence of the resistance to lodging was revealed with the panicle length. The thicknesses of the first and second internodes affected some elements of the productivity structure (panicle length, panicle mass, the mass of 1000 grains, etc.). The Galchenko index (JG) and the ratio of the stem length to the diameter of the second internode (Lc/d 2 ) had higher values in varieties with higher resistance to lodging. Promising lines 325h12, 200h15, 196h15, 175h15, 175h15 and the Sapsan variety combined stem stability and yield.

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The influence of some morphological parameters of the stem on the resistance to lodging of oat varieties and promising lines of the North-East FASC breeding