Abstract
Six genotypes of wheat [Triticum aestivum I.] representing different agronomic characters crossed in all possible combination, excluding reciprocals, in 2000/2001 season. The six parents and their 15 F1 hybrids were evaluated during 2001/2002 growing season in the experimental from at Sakha Agric-Res. Stn, Kafer EI-Sheikh Governorate. The studied traits were days to heading, days to maturity, plant height, no. of spikes/plant, kernel weighVspike, no. of grains/spike, grain yield/plant, leaf temperature, stomatal resistant and transpiration rate. The analysis of variance revealed highly significant differences among genotypes for all studied traits except no. of spikes/plant under stress environment. G.C.A and S.C.A mean squares were highly significant for all studied traits and the magnitude of G.C .. A was greater than S.C.A mean squares, suggesting that additive genetic effects were predominant and played a major role in the inheritance of all traits. The genetic components Le. additive and dominance were highly significant under stress environment for all traits. • Significant dominance type of gene action was detected for all studied characters, except for heading date and maturity date, the dominance component was larger in magnitude than the additive one and the average degree of dominance in these character revealed the existence of over dominance. The value (H2/4 H1) was approximately equal to its maximum value for heading date, maturity date and number of spikes/plant, whereas , it was deviated from 0.25 for other traits .Heritability estimates in broad sense were high. however high to moderate heritability values (in narrow sense) were detected for heading date, indicating that most of genetic variance might be due to additive genetic effects .. The genetic variance might be due to additive types of gene action, so selection could be useful in this respect. Narrow sense heritability values were low for all traits indicating that most of genetic variance might be due to non-additive genetic effects.
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Claims 12
Claim · model-written summary
Wheat genotypes differed significantly for all studied traits except spike number per plant under stress.
- Taxon
- WHEAT
Triticum aestivumt0 - Material
- genotypese0
- Outcome
- all studied traitse0
- Direction
- differencese0
- Qualifier
- except no. of spikes/plant under stress environmente0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The analysis of variance revealed highly significant differences among genotypes for all studied traits except no. of spikes/plant under stress environment.”
t0“WHEAT”
Claim · model-written summary
General and specific combining ability mean squares were highly significant for all studied wheat traits.
- Taxon
- WHEATTriticum aestivumt0
- Outcome
- G.C.A and S.C.A mean squarese0
- Direction
- highly significante0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“G.C.A and S.C.A mean squares were highly significant for all studied traits”
t0“WHEAT”
Claim · model-written summary
General combining ability mean squares exceeded specific combining ability mean squares, suggesting predominant additive genetic effects.
- Taxon
- WHEATTriticum aestivumt0
- Outcome
- magnitude of G.C .. Ae0
- Direction
- greater thane0
- Comparator
- S.C.A mean squarese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the magnitude of G.C .. A was greater than S.C.A mean squares, suggesting that additive genetic effects were predominant and played a major role in the inheritance of all traits”
t0“WHEAT”
Claim · model-written summary
Additive and dominance genetic components were highly significant under stress for all traits.
- Taxon
- WHEATTriticum aestivumt0
- Outcome
- additive and dominancee0
- Direction
- highly significante0
- Qualifier
- under stress environment for all traitse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The genetic components Le. additive and dominance were highly significant under stress environment for all traits.”
t0“WHEAT”
Claim · model-written summary
Dominance gene action was significant for all studied characters except heading and maturity dates.
- Taxon
- WHEATTriticum aestivumt0
- Outcome
- dominance type of gene actione0
- Qualifier
- except for heading date and maturity datee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Significant dominance type of gene action was detected for all studied characters, except for heading date and maturity date”
t0“WHEAT”
Claim · model-written summary
The dominance component exceeded the additive component and indicated overdominance for the stated characters.
- Taxon
- WHEATTriticum aestivumt0
- Outcome
- dominance componente0
- Direction
- larger in magnitudee0
- Comparator
- additive onee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the dominance component was larger in magnitude than the additive one and the average degree of dominance in these character revealed the existence of over dominance”
t0“WHEAT”
Claim · model-written summary
H2/4 H1 was approximately maximal for heading date, maturity date and spikes per plant.
- Taxon
- WHEATTriticum aestivumt0
- Outcome
- H2/4 H1e0
- Direction
- approximately equal to its maximum valuee0
- Qualifier
- heading date, maturity date and number of spikes/plante0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The value (H2/4 H1) was approximately equal to its maximum value for heading date, maturity date and number of spikes/plant”
t0“WHEAT”
Claim · model-written summary
H2/4 H1 deviated from 0.25 for the other wheat traits.
- Taxon
- WHEATTriticum aestivumt0
- Outcome
- other traitse0
- Direction
- deviatede0
- Value
- 0.25e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“it was deviated from 0.25 for other traits”
t0“WHEAT”
Claim · model-written summary
Broad-sense heritability estimates were high.
- Taxon
- WHEATTriticum aestivumt0
- Outcome
- Heritability estimates in broad sensee0
- Direction
- highe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Heritability estimates in broad sense were high.”
t0“WHEAT”
Claim · model-written summary
Narrow-sense heritability for heading date was high to moderate.
- Taxon
- WHEATTriticum aestivumt0
- Outcome
- heritability values (in narrow sense)e0
- Direction
- high to moderatee0
- Qualifier
- heading datee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“high to moderate heritability values (in narrow sense) were detected for heading date”
t0“WHEAT”
Claim · model-written summary
The authors suggest that selection could be useful given additive genetic variance.
- Taxon
- WHEATTriticum aestivumt0
- Outcome
- selection could be usefule0
- Qualifier
- additive types of gene actione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The genetic variance might be due to additive types of gene action, so selection could be useful in this respect.”
t0“WHEAT”
Claim · model-written summary
Narrow-sense heritability was also reported as low for all traits, implying nonadditive variance.
- Taxon
- WHEATTriticum aestivumt0
- Outcome
- Narrow sense heritability valuese0
- Direction
- lowe0
- Qualifier
- for all traitse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Narrow sense heritability values were low for all traits indicating that most of genetic variance might be due to non-additive genetic effects.”
t0“WHEAT”