Combining Ability for Grain Yield and Some Agronomic Traits in Diallel Crosses of Bread Wheat under Nitrogen Stressed Conditions
Yassmin TM Emam; Kamal IM Ibrahim; Ahmed A Mohamed; A. El-Gabry, Yasser;
Abstract
Six bread wheat genotypes and their 15 F1
crosses were evaluated under two nitrogen fertilization levels (40 and 80 kg N/fed) to estimate combining ability for days to heading,
plant height, spike length, number of
spikes/plant, kernels number/spike, weight of
100-kernels and grain yield/plant during
2018/19 season. Results revealed that significant nitrogen levels (N) mean squares were detected for all studied characters. Mean squares
due to genotypes (G), parents and crosses for
the studied characters were significant at both
nitrogen levels and their combined analyses.
Also, G x N interaction was highly significant
for the studied characters. The general and specific combining ability variances were found
to be significant for all studied characters at
both-N-levels and their combined analyses.
GCA/SCA ratios were less than unity for all
studied characters at both N-levels and their
combined data. The behavior of gene action
varied from nitrogen level to another where the
interactions of GCA and SCA with nitrogen
levels were significant for most studied characters. Sakha 93 was identified as the most
useful source for increasing favorable alleles
for grain yield/plant, kernels number/spike and
weight of 100-kernels under N-stress conditions, while Giza 168 was the best combiner
for earliness at the two N levels. Cross combinations; Sakha 93 x Sids 12 and Sakha 93 x
Misr 1 gave the best SCA effects for grain
yield/plant under N-stress conditions. Significant positive correlations were detected between means of parents and F1 crosses with
their GCA and SCA effects for most studied
characters under the two nitrogen levels, respectively
crosses were evaluated under two nitrogen fertilization levels (40 and 80 kg N/fed) to estimate combining ability for days to heading,
plant height, spike length, number of
spikes/plant, kernels number/spike, weight of
100-kernels and grain yield/plant during
2018/19 season. Results revealed that significant nitrogen levels (N) mean squares were detected for all studied characters. Mean squares
due to genotypes (G), parents and crosses for
the studied characters were significant at both
nitrogen levels and their combined analyses.
Also, G x N interaction was highly significant
for the studied characters. The general and specific combining ability variances were found
to be significant for all studied characters at
both-N-levels and their combined analyses.
GCA/SCA ratios were less than unity for all
studied characters at both N-levels and their
combined data. The behavior of gene action
varied from nitrogen level to another where the
interactions of GCA and SCA with nitrogen
levels were significant for most studied characters. Sakha 93 was identified as the most
useful source for increasing favorable alleles
for grain yield/plant, kernels number/spike and
weight of 100-kernels under N-stress conditions, while Giza 168 was the best combiner
for earliness at the two N levels. Cross combinations; Sakha 93 x Sids 12 and Sakha 93 x
Misr 1 gave the best SCA effects for grain
yield/plant under N-stress conditions. Significant positive correlations were detected between means of parents and F1 crosses with
their GCA and SCA effects for most studied
characters under the two nitrogen levels, respectively
Other data
Title | Combining Ability for Grain Yield and Some Agronomic Traits in Diallel Crosses of Bread Wheat under Nitrogen Stressed Conditions | Authors | Yassmin TM Emam; Kamal IM Ibrahim; Ahmed A Mohamed; A. El-Gabry, Yasser | Keywords | Bread wheat;Combining ability;Gene action;Nitrogen stress | Issue Date | 10-Mar-2021 | Journal | Arab Univ. J. Agric. Sci., Ain Shams Univ., Cairo, Egypt | Volume | 29 | Issue | 1 | Start page | 293 | End page | 305 | DOI | DOI: 10.21608/ajs.2021.59713.1337 |
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