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Determination of
ontogenetic selection criteria for grain yield in spring
barley (Hordeum vulgare) by path-coefficient analysis
Bilal Deniz1, Zuhal Kavurmaci1* and
Mehmet Topal2
1Department
of Agronomy, Agricultural Faculty, Atatürk University, 25240
Erzurum, Turkey.
2Department
of Animal Science, Agricultural Faculty, Atatürk University,
25240 Erzurum, Turkey.
*Corresponding author. E-mail:
zuhalk25@hotmail.com.
Accepted
23 March, 2009 |
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Path-coefficient analysis was performed to determine the
interrelationships among grain yield, yield components
(spike number per m-2, kernel number per spike,
average kernel weight) and some phenological characteristics
(duration and growing degree-days of vegetative and
grain-filling periods) in spring barley genotypes in
2004-2005. Grain yield depended mainly on spike number per m-2
and kernel number per spike; average kernel weight had a
negligible effect on grain yield in spring barley genotypes.
Grain yield was significantly and positively associated with
the spike number per m-2 and negatively
correlated with other characteristics studied. Spike number
per m-2 had considerable negative effect on the
average kernel weight. A lengthening of the grain-filling
period induced an increase in the average kernel weight and
a positive and significant correlation was found between the
two characteristics. Spike number per m-2 and
kernel number had positive direct effects on grain yield in
spring barley genotypes. The growing degree-days (GDD) for
vegetative period had significant positive direct effect on
kernel number, and the GDD for grain-filling period had
significant positive direct effect on kernel weight. The
results indicated that spike number per m-2,
kernel number per spike and the GDD for vegetative and grain
filling period were the most reliable selection criteria for
improving grain yield in spring barley in cool and
short-season environments.
Key
words:
Correlation coefficient, path-coefficient analysis,
Hordeum vulgare, grain yield and components, ontogenetic
characteristics. |
