Estimation of average values and stability parameters for yielding features in collection of winter triticale (X Triticosecale Wittmack) genotypes
Wanda Kociuba
genetyka.roslin@up.lublin.plInstytut Genetyki i Hodowli Roślin Akademia Rolnicza, Lublin (Poland)
Abstract
The examined material consisted of a population of 565 varieties and strains of winter triticale analysed over the years 1982–1990 in a four-year-cycle of one-replicated field experiments. Stability parameters were established for the following features: plant height, number and weight of grain per spike, 1000 grain weight and total protein content in grain, in accordance with the methodology prepared by Eberhart and Russel (1996). Each genotype in the presented study was assessed on the basis of the average value of the feature, the regression coefficient (bi), and the mean- square of deviation from regression (S2d1). The reaction of the genotypes over the years was interpreted by means of the linear regression of the analysed objects in relation to the environmental effects; it has been presented in the system of coordinates referring to the mean values of the genotypes (yij) and their regression coefficients (bi). The applied analysis of regression enables the choice of genotypes in which the average value in years is high for a particular feature an does not change much in cultivation years. The examined population of winter triticale has been characterised by a great variety of genotypes, both in relation to the analysed features and to the reaction to changing weather conditions over the years of study. The genotypes with a high and stable level of important features such as weight of grain per spike, weight of 1000 grains or protein content in grain prove to be valuable. Therefore they can become a precious starting material for breeding of varieties characterized by steady yield and good quality.
Keywords:
yielding features, winter triticale, stability, variabilityReferences
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Authors
Wanda Kociubagenetyka.roslin@up.lublin.pl
Instytut Genetyki i Hodowli Roślin Akademia Rolnicza, Lublin Poland
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