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Alpha-and beta-amylase activity in the Triticale grains

100%

Sitarski J. , Andrzejczuk-Hybel J. , Kaczkowski J.

nr 4

Heritability, variation and relationship between frost resistance of winter barley and some of its characters

51%

Gut M. , Bichonski A. , Wegrzyn S.

nr 1

The aim of the present paper has been to define heritability and mutual relations between frost resistance and the other traits of two- and six-rowed winter barley: yield, 1000 grain weight and grain filling as well as earliness, plant height and resistance to lodging. The research material was made up of winter barley breeding strains of F6-F7 generation researched over 1999-2002 over three two-year cycles. All the characters analysed were marked with coefficient of variability (CV) coefficients of heritability (H) and coefficients of phenotypic and genotypic correlation. The greatest variation over years was observed for frost resistance of both two- and six-rowed barley. Such a great variation of the strains researched makes it possible to select forms resistant in both cultivar groups. The coefficient of heritability of frost resistance was in two-rowed barley quite stable, however in six-rowed barley it was changing considerably (from zero to 0.83).