Six diverse [Lirasol (P1), Duplo (P2), Canola-103 (P3), Suyo (P4), Sido
(P5) and Cresor (P6)] canola varieties and their 15 F1 half diallel crosses were
evaluated for seed yield and its attributes under two alinity levels at Ras Sudr.
South Sinai and normal conditions at Moshtohor. Kalubia. Mean squares due to
general and specific combining ability were significant for all traits studied at
the three environments, suggesting the importance of both additive and non-
additive components of genetic variations. The largest part of the total genetic
variability was a result of additive and additive x additive gene action types for
all traits studied as detected by GCAJSCA ratio. Sedo (P5) and Canola-103 (P3)
seem to be a good combiners for seed yield and most of its attributes while.
Duplo (P2) was the best one for seed yield and number of siliquas/plant under all
environments studied.
Five, ten and six crosses showed significant positive SCA effects for
seed yieldlplant in low salinity, high salinity and normal experiments.
respectively. The three crosses P2 x P5, P3 x P4 and P5 x P6 ehibited significant
positive S effects in the three experiments.
From the twenty one diallel set, ten genotypes gave (s) value <1, out of
them, canola-103 (P3), P2 x P3 and P2 x P5; the later two crosses exhibited high
yielding ability under high salinity level. Moreover, P3 considered to be a good
combiner for seed yield/plant and one or more of its components under different
environments studied. Hence, selection for both low (S) value and high yielding
capacity at the stress environment would be a useful criterion to exploit more
tolerant genotypes.
High heritability values were detected for all traits studied except
number of racemes/plant in low salinity and number of seeds/siliquae and seed
index in high salinity experiments, revealing that the most of phenotypic
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