سازگاري و پايداري عملكرد دانه لاين هاي گندم دوروم در مناطق سردسير ديم

Adaptability and Stability of Grain Yield in Durum Wheat Lines in Cold Dryland Areas

In order to study the adaptability and yield stability of dryland promising durum wheat genotypes, this experiment was conducted with 22 genotypes of durum wheat plus 2 bread wheat cultivars as checks in RCBD for three cropping seasons (1998-2001) in six cold research stations in dryland areas. In each location simple ANOVA and combined ANOVA for three years were implemented. Because in combined analysis (3 years in each location) and according to Hartly Finax test, the error mean squares (MSe) at different locations were significant, therefore for uniformity of MSe, the experimental locations were divided into two groups. Linn and Binns parameter, coefficient of variation of grain yield and rank method were used for determination of stable cultivars/lines. Results of combined ANOVA in the first group (Maragheh, Sararood and Ardebil) showed that interaction effects of year x location and year x cultivar were significant (P 0.01), and also differences among cultivars/lines in grain yield were significant at 5% probability level. Bread wheat cultivars had the highest grain yield and, in durum wheat, lines no. 2 and 4 with 1585 and 1566 kgha^-ʹ, respectively were the superior lines. Lines no.2 and 18 had the most stability and grain yield among genotypes. In this group line no.18 with facultative growth habit is recommended for these regions. In the second group (Shirvan,Uromieh and Ghamloo) the effects of year, location, cultivars and also interaction effects of year x location and year x location x cultivar on grain yield were significant. After bread wheat cultivars that had the highest grain yield, durum wheat lines no. 9 and 18 with 756 and 734 kghaʹ, respectively were the highest yielding genotypes. Regarding grain yield, results of stability and adaptability analysis and growth habit, these two lines are recommendable for growing in these locations.