Variability of yield structure and of physical traits determining lodging resistance in barley mutants
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Institute of Plant Genetics, Polish Academy of Sciences, Strzeszyńska 34, 60-479 Poznan, Poland
Acceptance date: 1997-12-10
Int. Agrophys. 1998, 12(3): 221-225
The paper presents an analysis of the variability of yield structure traits and lodging resistance of 32 spring barley mutants. The mutants were obtained from the DH line HK-119 using a chemomutagen N-ni-troso-N-methylurea (MNLJ) and helium-neon laser. The mutants were chosen in such a way that they represented a broad spectrum of plant height. The investigation allowed mutants with improved parameters of yield structure in comparison to the initial form HK-119 to be selected. The analysis of morphological and physical traits stem diameters, wall thickness and stem elasticity (Young's modulus) made possible the relationship between these traits and lodging grade to be estimated. The lodging grade was assessed in field conditions on a 9 degree scale, where 1 means no lodging and 9 the highest degree of lodging. Mutants of different plant height, with desirable yield structure and improved lodging resistance, were identified.
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