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Comparison of stability
statistics for yield in barley
(Hordeum vulgare L.)
Zeki Mut1*,
Ali Gülümser2 and Abdulveli Sirat2
1Faculty
of Agriculture, Department of Field Crops, Bozok University,
Yozgat-66200, Turkey.
2University
of Ondokuz Mayıs, Faculty of Agriculture, Department of
Field Crops, 55139, Samsun, Turkey.
*Corresponding author. E –mail:
zmut@omu.edu.tr.
Phone: (90 354) 212 70 01. Fax: (90 354) 212 27 89.
Accepted
1 March, 2010 |
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Analysis
of multienvironment trials (METs) of crops for cultivar
evaluation and recommendation is an important issue in plant
breeding research. Evaluating both stability of performance
and high yield is essential in MET analyses. The objectives
of this study were to assess interrelationship among these
measures and to identify high-yield and stable barley (Hordeum
vulgare L.) cultivars in 11 environments during 2001 -
2003 in the central Black Sea region of Turkey. Significant
differences were observed among barley cultivars for grain
yield, thousand-grain weight, hectoliter weight, plant
height and heading date. In this
study, high values of TOP (proportion of environments in
which a genotype ranked in the top third) was associated
with high mean yield, but the other methods were not
positively correlated with mean yield and instead
characterized a static concept of stability. The results of
principal component (PC) analysis and correlation analysis
of parametric and nonparametric stability statistics and
yield indicated that only TOP method would be useful for
simultaneously selecting for high yield and stability. This
method recommended Fahrettinbey and Sladoran as stable and
Balkan 96 and Erginel as unstable genotypes. A biplot of the
first two PCs also revealed that the stability statistic
methods grouped as three distinct classes that corresponded
to different dynamic (agronomic) and static (biological)
concepts of stability.
Key
words:
Barley, genotype x environment
interaction, parametric and nonparametric measures, dynamic
and static stability. |
