Variation of some physical and geometrical stem features in doubled haploids of barley
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Institute of Plant Genetics, Polish Academy of Sciences, 60-479 Poznań, Strzeszyńska 34, Poland
Acceptance date: 2000-12-13
Int. Agrophys. 2000, 14(2): 187-189
Some physical and geometrical features related to lodging resistance were observed in barley doubled haploid (DH) lines. DH lines were derived from the cross between two-rowed cultivar Maresi and six-rowed cultivar Pomo by the Hordeum bulbosum technique. The initial cultivars, their F1, F2 hybrids and DH lines (20 two-rowed and 18 six-rowed) were investigated in the field conditions conducted in the completely randomised block design with three replications. The following characters of the stem were analysed: length, external diameter, wall thickness and elasticity (Young’s modulus). Lodging grade was estimated applying a 9-grade scale (where 1 means no lodging and 9-the highest degree of lodging). The stem elasticity was evaluated by the ultrasonic method. Analysis of variance was performed and contrasts between six-rowed and two-rowed genotypes were calculated. Genetic parameters related to with additive gene action [d], dominance [h] and nonallelic interaction of homozygous [i] and heterozygous [l] loci were estimated. The values of the [d] parameter were significant for all the studied traits. The effects of dominance were important only for the stem length and lodging grade. Six-rowed DH lines were characterised by the lower elasticity and shorter stems than the two-rowed ones but were more susceptibile to lodging.
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