The production of new and compatible cultivars to different environments is one of the most important
goals for the breeders. The crossing new cultivars and the selection of superior genotypes for desirable
traits among their offspring is a method that has always been used by breeders. 28 genotypes obtained
from the crossing of a 7 × 7 one-way diallel experiment consisting of seven parents (Alvand, Anfarm9,
Chamran2, BC Roshan, Qods, Ofogh, local variety Sorkh-dane) and their 21 hybrids were investigated
in a randomized complete block design with three replications in the research field of the Faculty of
Agriculture of University of Birjand (Iran) under non-stress and drought stress conditions. The
analysis of variance showed a significant difference among genotypes for all traits. Mean squares of
GCA and SCA were significant for all traits under non-stress and stress conditions, so, there were
additive and non-additive components of heritable variance in all traits. The BC Roshan parent had the
high combining ability and Ofogh parent had the lowest combining ability in most traits in non-stress
and stress conditions. In both conditions, BC-Roshan × Chamran2, Sorkh-dane × Qods and Ofogh ×
Anfarm9 hybrids had the highest yield and yield dependent traits. Hayman's variance analysis showed
that component a (additive genetic diversity), component b (dominance genetic diversity), component
b1 (heterosis), component b2 (heterosis specifically for each parent), and component b3 (specific
dominance deviation per cross) were significant in both conditions in all traits.The Hayman's analysis
confirmed the results of Griffing's analysis.