In the present paper evaluation of the effects of gene action on the properties determining resistance to lodging in barley is presented. Genetic analysis was performed on the data for doubled haploids (DH) examined in a 3-year field experiment. The DH lines were derived from the Grit x Havila hybrids by the ‘Hordeum bulbosum’ method. Lodging degree and some morpho- logical and physical characteristics such as stem length, diameter, wall thickness, and elasticity (the Young's modulus) and velocity of the ultrasound flow through the stem were determined. Heri- tability coefficients were calculated, and effects of the additive gene action, such as dominance and interaction of homo- and heterozygous loci, were evaluated for the above characteristics. It was found that the physical stem indices were the most differentiating characteristics of the studied DH lines. A genetic analysis showed significance of the additive gene action with regard to all morphological and physical characteristics. Herita- bility coefficients appeared to be the highest for the Young's modulus (78.2-85.3%) and velocity of the ultrasound flow through the stem (76.1-84.5%).The number of effective factors for the studied characteristics ranged from 1 to 5.