وراثت پذيري عملكرد دانه و اجزاء علمكرد كلزا در شرايط عادي و تنش خشكي

Heritability of Seed Yield and Yield Components in Rapeseed (Brassica Napus) under Drought Stress and Normal Conditions

In order to estimate heritability of seed yield and yield components in rapeseet diallel cross method was attempted . The 28 genotypes including 21 F2 progenies and parents were grown under two irrigation regimes {drought stress and normal) in split plot design with two replications. The results showed that variance of genotype was significant for yield and other traits, therefore there were high genetic diversit among genotypes. Diallel analysis showed both additive and non additive genes effect for yield in both conditions. The number of pods/plant in drought stress was similar t yield in the non- stress condition and it was considered by non-additive effects c genes. The data also showed heterosis for seed yield in both growing conditions Combined diallel analysis indicated that additive variances was important for seeds/po and seed weight,whereas non-additive effect for branches/plant.Broad sense heritabilit was high for all traits in both conditions, whereas narrow sense heritability varied from low to high in both conditions. Among yield components , seed weight and seeds/po had high narrow sense heritability under drought stress. It was concluded that recurrent selection would be more effective in improving yield in both growing conditions.