Heterosis , Potence Ratio , Combining Ability and Correlation of Some Economic Traits in Diallel Crosses of Pumpkins
El-Tahawey, M.A.F.A.; Kandeel, A.M.; Youssef, Sabry Mousa Soliman; Abd El-Salam, M. M. M.;
Abstract
Ten F1 hybrids of pumpkin produced by a half diallel cross were evaluated along
with their five inbred lines in order to detect the general performance and estimate the
heterosis percentages, potence ratio, combining ability and correlation coefficients of
some economic traits. For total yield/plant, the hybrids showed a range of heterosis
percentages from -56.1 to 77.6% and from -66.8 to 54% over the mid and better parent,
respectively. Large blue Hubbard x A15 and Indian line x A15 hybrids had the highest
significant heterotic effects of 77.6% and 54% over the mid and better parent,
respectively. Most of F1 hybrids reflected positive heterotic effects for number of
seeds/fruit and seed oil content, while most of F1 hybrids gave negative values of
heterosis for weight of seeds/fruit, weight of 100 seeds and seed yield/plant when
estimated, especially, with the higher parents. Variances due to general (GCA) and
specific (SCA) combining ability were highly significant for all studied traits, indicating
the involvement of both additive and non-additive types of gene action in the inheritance
of these traits. The estimates of GCA effects revealed that none of the parents was a good
general combiner for the characters consistently; Indian line was the best combiner for
vine length, number of fruits/plant and seed oil content, Red Kuri for flowering earliness
and both Indian line and A15 for flesh thickness, average fruit weight and total
yield/plant. A15 was the best combiner for number of seeds/fruit, weight of seeds/fruit
and seed yield/plant. Indian line x A15 showed the highest positive estimated SCA values
for number of fruits/ plant, total yield/ plant, weight of 100 seeds, seed yield/plant and
seed oil yield/plant. In addition, vine length, leaf area, fruit flesh thickness, number of
fruits/plant and average fruit weight should be used as selection criteria for improving
the fruit yield, while number of days to first female flower, flesh thickness, fruit weight,
number of fruits/plant, total yield/plant, number of seeds/fruit, weight of seeds/fruit,
weight of 100 seeds, seed yield/plant and seed oil concentration should be used as
selection criteria for improving seed oil yield of pumpkin.
with their five inbred lines in order to detect the general performance and estimate the
heterosis percentages, potence ratio, combining ability and correlation coefficients of
some economic traits. For total yield/plant, the hybrids showed a range of heterosis
percentages from -56.1 to 77.6% and from -66.8 to 54% over the mid and better parent,
respectively. Large blue Hubbard x A15 and Indian line x A15 hybrids had the highest
significant heterotic effects of 77.6% and 54% over the mid and better parent,
respectively. Most of F1 hybrids reflected positive heterotic effects for number of
seeds/fruit and seed oil content, while most of F1 hybrids gave negative values of
heterosis for weight of seeds/fruit, weight of 100 seeds and seed yield/plant when
estimated, especially, with the higher parents. Variances due to general (GCA) and
specific (SCA) combining ability were highly significant for all studied traits, indicating
the involvement of both additive and non-additive types of gene action in the inheritance
of these traits. The estimates of GCA effects revealed that none of the parents was a good
general combiner for the characters consistently; Indian line was the best combiner for
vine length, number of fruits/plant and seed oil content, Red Kuri for flowering earliness
and both Indian line and A15 for flesh thickness, average fruit weight and total
yield/plant. A15 was the best combiner for number of seeds/fruit, weight of seeds/fruit
and seed yield/plant. Indian line x A15 showed the highest positive estimated SCA values
for number of fruits/ plant, total yield/ plant, weight of 100 seeds, seed yield/plant and
seed oil yield/plant. In addition, vine length, leaf area, fruit flesh thickness, number of
fruits/plant and average fruit weight should be used as selection criteria for improving
the fruit yield, while number of days to first female flower, flesh thickness, fruit weight,
number of fruits/plant, total yield/plant, number of seeds/fruit, weight of seeds/fruit,
weight of 100 seeds, seed yield/plant and seed oil concentration should be used as
selection criteria for improving seed oil yield of pumpkin.
Other data
| Title | Heterosis , Potence Ratio , Combining Ability and Correlation of Some Economic Traits in Diallel Crosses of Pumpkins | Authors | El-Tahawey, M.A.F.A. ; Kandeel, A.M. ; Youssef, Sabry Mousa Soliman ; Abd El-Salam, M. M. M. | Keywords | Pumpkin, Fruit yield, Seed oil, Heterosis, Potence ratio, Combining ability, Correlation. | Issue Date | 2015 | Journal | Egyptian Journal of Plant Breeding, 19 (2): 419-439. | Description | Egyptian Journal of Plant Breeding, 19 (2): 419-439. |
DOI | 10.12816/0011721 |
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