Stability of stem rust resistance in some ethiopian durum wheat varieties
2000
Amogne, S. | Dawit, W. | Andenow, Y. (Debre Zeit Agricultural Research Center, Debre Zeit (Ethiopia))
In the central highlands of Ethiopia, dururn wheat (Triticum durum Desf.) and stem rust (Puccinia graminis f.sp. tritici) have co-evolved for thousands of years resulting in a wide virulence spectrum of the stem rust fungus. Races of the pathogen in the region are among the most virulent in the world, and the Debre Zeit area is known to represent the widest virulence spectrum in the country. Five durum wheat cultivars, viz., Gerardo, Cocorit- 71, Foka, Boohai and DZ-04-118, were studied from 1993/94 to 1999/00 at Debre Zeit to determine the stability of their resistance to stem rust. Two statistics suitable for measuring the stability of disease resistance over time were used in this investigation: genotypic variance (S2) and coefficient of variation (CVi). Accordingly, cultivars Foka and Boohai were found to be more stable in their resistance to stem rust than the other cultivars tested. Foka and Boohai had smaller S2j with values of 0.146 and 0.154, respectivelyand relatively lower CVi values of 27.30 and 30.62, respectively. Gerardo was the least stable cultivar in terms of resistance to stem rust.
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