COMPARISON OF SINGLE TRAIT WITH MULTIPLE TRAIT SELECTION IN BARSEEM CLOVER (Trifolium alexandrinum, L.)

Ahmed, M.

doi:10.21608/jpp.2000.259542

Cited by 1 publication

(1 citation statement)

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“…The present results are in accordance with the results of Weyhrich et al (1998), Where heritability estimates ranged from 17.1% from half-sibs to 86.7% from S 2 -progeny. In the meantime, high estimates of heritability ranged from 48.1 to 95.2 were recorded by Bekheit and Mahdy (1988), Bakheit (1989a), Ahmed (1992) and Ahmed (2000). Ullah et.al, (2013), evaluated the performance of 196 half-sib families (HSF) derived from Sarhad white variety of maize at the research farm of Agricultural university, Peshawar using partially balanced lattice square design with two replications.…”

Section: Forage Botanical Compositionmentioning

confidence: 99%

Variability in a Silage Maize “Zea mays, L.” Base Population via Two Types of Families 3. Forage botanical composition and dry matter partitioning

Ahmed

El-Sheikh

M.El-Sayed

et al. 2020

Alexandria Journal of Agricultural Sciences

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The base population for the recent study which is a yellow seed synthetic variety of maize was provided by Dr. M. Abd El-Sattar Ahmed, professor of crop science, Crop Science Department, faculty of Agriculture, Egypt. Two types of families had formulated, as a step before selection for high yielding ability. Those were half-sib (H.S) families and the first generation of self-pollination (S 1 ) families. Variability in the base population gene pool had estimated depending on variance components of the families. Reduction in mean values associated with S 1 families relative to half-sib families reached 0.182, 1.18, 0.98, 3.88, 2.75 and 5.72% for leaves percentage, stem percentage, ear percentage, grain percentage, cob percentage and husk percentage, respectively. Genotypic variances among S 1 families was larger in magnitude than the respective value for half-sib families in each measured botanical composition and dry matter partitioning characters. Meanwhile, within family's variance, (σ 2 f ), environmental variances (σ 2 e ) had reduced in S 1 families relative to half-sib families in each measured character. Genotypic variation among half-sib and S 1 families were less than 20% of the studied botanical composition and dry matter partitioning characters mean values, except for cob percentage and husk percentage that had a genotypic variation amount to 24% and 26%, respectively. The estimates of additive variance (δ 2 A ) were positive for all studied botanical composition and dry matter partitioning characters. While, the estimates of dominance variance (δ 2 D ) were negative for all characters, the ratio of δ 2 A /δ 2 G indicated that additive genetic variance was more effective in controlling all studied botanical composition and dry matter partitioning characters. Estimates of heritability were higher in magnitude when calculated from first selfing generation (S 1 ) compared to half-sib families, for all studied characters. Stem percentage expressed the least estimate heritability among all studied characters in each family type (0.798 and 0.414 for half-sib and S 1 families, respectively). This might indicate the influence of environment in the expression of that character. Meanwhile husk percentage had highest genetic control expressed on heritability estimates from the two studied types of families.

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Section: Forage Botanical Compositionmentioning

confidence: 99%