Genotype x environment interaction and stability analysis for yield in durum wheat

الملخص EN

The objectives of this research were to assess genotype-environment interaction (GEI) and to determine stability of durum wheat (Triticum durum Desf.) cultivars for grain yield in the Sulaimani province.

seven durum wheat cultivars (Iraq7, Rash gull, Sham1, Bohooth 5, Acsad 65, Sham3 and Crezo )were evaluated under rainfed conditions using a randomized complete block design with3 replications.

The study was conducted for 2 sowing date and at 3 different locations around Sulaimani province, Kurdistan-Iraq.

Eight parametric stability methods including: the mean of yield; joint regression coefficient (bi), deviation from regression(S2di); environmental variance (EV); genotypic superiority index; deviation from mean (DFM) ; homeostasis (H%); genotypic resultant (GR) were used to identify the stability of these cultivars at six various environments in grain yield.

The results showed different response among cultivars for environments and no cultivar had superior performance in all Environments.

Yield reduction was large under spring sowing (58%).The stability parameters showed a wide range of variation between cultivars for grain yield.

By simultaneous selection for yield and stability the cultivars Crezo and Iraq7 had the best values according to most parameters of stability; hence, it has a wide adaptability over a range of environments of rainfall conditions in Sulaimani, Kurdistan-Iraq