The present study was carried to investigate type and relative amount of
genetic variance componentes and their interaction with the location. in addition
to evaluating heterosis of some quantitative characters in faba bean (Vicio lobo
L.). For this objective, a diallel crossing was performed without reciprocals,
including eight varieties (Rena blanka, Triple white, Tenova, Tena, Giza 2, Giza
716, Giza 461 and Giza 429) which were evaluated in a completely randomized
block design with three replications over two locations. The most important
studied characters were plant height, number of pods per plant, first pod position,
pod length, yield/plant, number of seeds per plant, number of seeds per pods and
100-seed weight per plant. .
For the effect of location, significant mean squares were detected for all
traits except plant height. Mean squares for genotypes, parents and hybrids were
highly significant for all characters. Significant mean squares of parents vs.
hybrids were showed for all traits except number of pods per plant and pod
length.
Both variances of general and specific combining abilities (GCA and
SCA) were found to be highly significant for all traits. The magnitudes of the
ratios of GCNSCA showed that the additive and additive X additive types of
gene action were the more important factors for all traits except number of pod's
per plant. The interactions between locations and both types of combining
abilities were highly significant for all traits.
The parental line Giza 716 was the best combiner for plant height, first
pod position, seed yield per plant, number of seeds per plant and l00-seed weight.
The parental line Rina blanka expressed significant desirable GCA effect for plant
height, pod length per plant, seed yield per plant, number of seeds per plant and
lOO-seed weight. The highest desirable SCA effects were observed in crosses;
(Tinova x Giza 716), (Tinova x Giza 461) and (Giza 2 x Giza 429) for plant
height, .number of pods per plant and yield and its components, (Rena blanka x |
