ESTIMATION OF SOME GENETIC PARAMETERS FOR GRAIN YIELD AND SOME OF ITS COMPONENTS IN TWO BREAD WHEAT CROSSES
El-Gabry, Yasser; Amal Z.A. Mohamed; H.A. Khalil;
Abstract
The present work was conducted at the Agric. Res. Station Farm, Faculty of
Agric., Ain Shams Univ, at Shalakan, Kalubia Governorate during the three successive
seasons 2004/2005, 2005/2006 and 2006/2007 using the six populations of two bread
wheat crosses to estimate some genetic parameters for grain yield/plant and certain
related characters. The first cross was between Giza168 and IB18 (Cross 1) and the second
one between Sids I and IB18 (Cross 2).
Results revealed that mean squares due to populations were highly significant
for most studied characters in the two crosses, indicating that the six populations within
each cross differed significantly for studied traits. Heterosis values were positive and
significant relative to either mid parent or better-parent values in the two crosses for most
of the studied characters, whereas heterosis values were negative and significant for days
to heading in both crosses. Positive and significant inbreeding depression values were
recorded for spike length in both crosses and for spikelets per spike in Cross 1, whereas
negative significant values were obtained for days to heading in Cross 1 and 100-kernel
weight in Cross 2. Over and complete dominance was recorded for all the studied
characters except kernels/spike in Cross 1 as-well-as plant height and grain yield/plant in
Cross 2.
Scaling tests (A, B, C and D) indicated the presence of non-allelic gene
interactions for all studied traits in both crosses. Additive genetic variance was
significant for each of days to heading, spikes/plant, grain yield/plant and spike length in
both crosses as-well-as kernels/spike in Cross 2 and for plant height and 100-kernel
weight in Cross 1. Dominance variance was significant for each of days to heading, plant
height, spikes/plant, kernels/spike and spikelets/spike in both crosses. Epistasis effects
were significant for most studied traits in the two crosses. Broad sense heritability
estimates were relatively high and ranged from 77% to 93.83% in Cross 1 compared with
values from 52.8% to about 93% in Cross 2. Narrow sense heritability percentages
ranged between 41.38 and 81.59 in Cross 1 and between 41.25% and 77.58% in Cross 2
for the studied traits.
Agric., Ain Shams Univ, at Shalakan, Kalubia Governorate during the three successive
seasons 2004/2005, 2005/2006 and 2006/2007 using the six populations of two bread
wheat crosses to estimate some genetic parameters for grain yield/plant and certain
related characters. The first cross was between Giza168 and IB18 (Cross 1) and the second
one between Sids I and IB18 (Cross 2).
Results revealed that mean squares due to populations were highly significant
for most studied characters in the two crosses, indicating that the six populations within
each cross differed significantly for studied traits. Heterosis values were positive and
significant relative to either mid parent or better-parent values in the two crosses for most
of the studied characters, whereas heterosis values were negative and significant for days
to heading in both crosses. Positive and significant inbreeding depression values were
recorded for spike length in both crosses and for spikelets per spike in Cross 1, whereas
negative significant values were obtained for days to heading in Cross 1 and 100-kernel
weight in Cross 2. Over and complete dominance was recorded for all the studied
characters except kernels/spike in Cross 1 as-well-as plant height and grain yield/plant in
Cross 2.
Scaling tests (A, B, C and D) indicated the presence of non-allelic gene
interactions for all studied traits in both crosses. Additive genetic variance was
significant for each of days to heading, spikes/plant, grain yield/plant and spike length in
both crosses as-well-as kernels/spike in Cross 2 and for plant height and 100-kernel
weight in Cross 1. Dominance variance was significant for each of days to heading, plant
height, spikes/plant, kernels/spike and spikelets/spike in both crosses. Epistasis effects
were significant for most studied traits in the two crosses. Broad sense heritability
estimates were relatively high and ranged from 77% to 93.83% in Cross 1 compared with
values from 52.8% to about 93% in Cross 2. Narrow sense heritability percentages
ranged between 41.38 and 81.59 in Cross 1 and between 41.25% and 77.58% in Cross 2
for the studied traits.
Other data
| Title | ESTIMATION OF SOME GENETIC PARAMETERS FOR GRAIN YIELD AND SOME OF ITS COMPONENTS IN TWO BREAD WHEAT CROSSES | Authors | El-Gabry, Yasser ; Amal Z.A. Mohamed; H.A. Khalil | Keywords | Bread wheat;Crosses;Heterosis;Inbreeding depression;Scaling tests;Additive effects;Dominance effects;Epistasis;Heritability;Genetic advance | Issue Date | 1-Jan-2009 | Journal | Egyptian Journal of Plant Breeding | Volume | 13 | Start page | 199 | End page | 212 |
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