| Titles |
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English :
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Genetical studies of heading date and some agronomic characters in wheat
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Arabic :
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دراسات وراثية على تاريخ التزهير/ محصول الحبوب وبعض الصفات المحصولية في القمح
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| Abstract |
A half diallel cross among six common wheat varieties and/or lines were evaluated in both F1 and F2 generations in the Exp. Farm. Fac. of Agric., Shibin El-Kom, El-Minufiya Univ. Egypt. During three successive seasons of 2002/2003, 2003/2004 and 2004/2005 .
The experimental design of randomized complete blocks with three, replications was used. Heading date, plant height, number of spikes per plant, number of kernels per spikes, spike length, 1000-kernel weights, straw yield, grain yield, total plant weight (g) and harvest index were studied. Significant mean squares for genotypes, parents and crosses were detected for all traits in both generations. Also, mean square of parents, vs. crosses was detected in both generations for all traits except 1000-kernel weight in F1 and spike length and harvest index in F2 generation.
The (P1) was found to be the best parent for spike length, and 1000-kernel weights, the (P3) was the top tested parent of grain yield per plant in both generations, P4 gave the lowest mean value of heading date and it was the top tested parents of number of spikes per plant and the parental line (P6) was the best parent for number of kernels per spike. The crosses (P1 x P3), (P2 x P4), (P2 x P5), (P3 x P4), (P4 x P5) and (P4 x P6) gave the highest mean values of grain yield per plant in both generations.
The mean squares associated with general and specific combining ability were significant for all traits in both generations. High GCA/SCA ratio which exceeded than unity were detected for most traits studied in both F1 and F2 generations. The parental varieties (P1) was the best combiner for heading date, spike lengths, and 1000 kernel weight in both F1 and F2 generations. Also the parental line (P3) was the best combiner for grain yield per plant, number of spikes per plant, plant height and total plant weight (g) in both F1 and F2 generation. Also, the parental (P4) line was the best combiner for heading date, plant height, number of kernel per spike, straw yield per plant, grain yield per plant and total plant weight (g) in both F1 and F2 generations. The crosses (P1 x P3), (P2 x P4), (P2 x P5), (P3 x P4), (P4 x P5), (P4 x P6) and (P5 x P6) had significant effects for grain yield in both F1 and F2 generations and (P3 x P1) and (P4 x P6) had significant negative effects for heading date.
The variance due to additive genetic effects (D) was significant for all traits studied in both F1 and F2 generations. The relatively proportions of variance due to additive effect was significant and greater in magnitude than the non-additive combinant (H). Over all dominance effect of heterozygous loci (h2) was significant for all traits studied except harvest index in both generations, 1000 kernel weight in F1 generation and spike length in F2 generation which indicate that the effect of dominance is due to heterozygousity. Additive genetic components (D) appeared to be the major portion of the genetic variation for all traits studied in both generations, which confirmed by the higher magnitude of GCA than those of SCA values. Overdominance was observed for all traits studied in both generations. The proportion of genes with positive and negative alleles in parents showed that positive and negative alleles were not equally distributed among the parents for all traits studied in both generations except spike length in F1 and total plant weight (g) in F2.
Low to moderate values of heritability were detected for all studied traits, indicating that the genetic variances are due to additive and non-additive genetic effects.
Generally, the results obtained from F2 data were nearly similar to those obtained from F1 data.
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| Publication year |
2006
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| Pages |
427-452
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| Availability location |
9 شارع الجامعة- الجيزة
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| Availability number |
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| Organization Name |
Field Crops Research Institute (FCRI)
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| City |
القاهرة
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| serial title |
حوليات العلوم الزراعية بمشتهر - كلية الزراعة
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| ISSN |
1110-0419
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| Author(s) from ARC |
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| External authors (outside ARC) |
إبراهيم حسيني إبراهيم درويش
كلية الزراعة بشبين الكوم - جامعة المنوفية
عز الدين السيد
كلية الزراعة بشبين الكوم - جامعة المنوفية
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| Agris Categories |
Agriculture - General aspects
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AGROVOC
TERMS |
Agronomic characters.
Wheats.
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| Publication Type |
Journal
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