Evaluation of drought tolerance indices for selection of Turkish oat (Avena saliva L.) landraces under various environmental conditions
Özet
The main objective of this research was to evaluate fourteen oat (Avena
sativa L.) landraces and cultivars for drought tolerance using several
indices. The trials were conducted both under rain-fed and irrigated
conditions for three growing seasons (2001-2004) in two locations in the
Central Anatolian Region of Turkey. Biplot analysis based on the
Spearman's rank correlation matrix revealed that the drought indices
were significantly inter-correlated with each other and can be
classified into four groups. The first group, reflecting stress
tolerance index (STI), mean productivity (MP), geometric mean
productivity (GMP), harmonic mean (HM), linear regression coefficient
(b(i)), yield index (YI), rainfed grain yield (Ys) and irrigated grain
yield (Yp) appeared to be the relatively high yielding genotypes (G3,
G5, G1, G2, G14, G6, G13 and G4) with high drought tolerance. The
parameter of superiority index (P-i) in the second group was able to
distinguish the landraces G10, G11, G12, G9 and G7 with low adaptability
and low drought resistant. The third group included yield stability
index (YSI) had a negative correlation with mean grain yield under
irrigated conditions referred to drought resistant genotype (G8) with
low yielding performance.
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