Genetika 2014 Volume 46, Issue 3, Pages: 705-718
https://doi.org/10.2298/GENSR1403705K
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Parametric stability analyses of multi-environment yield trials in Triticale (xTriticosecale wittmack)
Kaya Yuksel (Bahri Dagdas International Agricultural Research Institute, Konya, Turkey)
Ozer Emel (Bahri Dagdas International Agricultural Research Institute, Konya, Turkey)
One of the main goals of Triticale (xTriticosecale Wittmack) Breeding Program
of Turkey is to improve high yielding and stable genotypes across
environments. In this study, 16 parametric stability methods were used to
evaluate the genotype x environment interaction (GEI) in 9 (4 officially
registered varieties and 5 advanced lines) triticale (xTriticosecale
Wittmack) genotypes. The genotypes were evaluated for grain yield at 4
different locations for 3 years in rain-fed areas of Turkey. The testing
locations have different climatic and edaphic conditions providing the
conditions necessary for the assessment of stability. A combined analysis of
variance, parametric stability statistics and rank correlations among them
were determined. Significant differences were detected between genotypes and
their GEIs. Different parametric stability statistics were used to determine
stability of the studied genotypes. The level of association among the
statistics was assessed using Spearman’s rank correlation. Rank-correlation
coefficients between yield and some parametric stability statistics were
highly significant. Genotypes mean yield was significantly correlated to the
parametric stability statistics Pi (r = 0.95**), PCA1 (r = 0.87**) and Di (r
= 0.98**). A principal component analysis based on rank correlation matrix
was performed for grouping the different parametric stability statistics
studied. In conclusion, based on most parametric stability statistics, the
genotype G8 was found to be the most stable and high yielding. This genotype
is, therefore, recommended for release as a cultivar for rain-fed areas of
Turkey.
Keywords: genotype x environment interaction, yield, stability, Triticale(xTriticosecale Wittmack)