الفهرس 
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Abstract
The present study was carried out to :1-Evaluate the performance of nine durum wheat parental genotypes and their F1s aswell as F2s generations under heat stress of El-Wadi El-Geeded conditions. 2-Studt the effects of general and specific combining ability for some agronomic traits. 3- Estimate the genetic components and genetic traits. 4- Study the effects of mid and better parent heterosis as well as inbreeding depression.