Genetic assessment of nitrogen use efficiency in cotton
2011
Abdel El-Moghny, A.M. | Abd El-Sayyed, S.M. | Mahgoub, E.M. | Raafat, M.A.
This study aimed to investigate the genetic variability and the genetic control of nitrogen use efficiency in cotton. A set of parental cotton genotypes and their F1 progenies under two forms of nitrogen fertilizers were used. All studied genotypes, N treatment and genotype x N. treatment (G X N) interaction showed highly significant differences for nitrogen uptake efficiency, nitrogen utilization efficiency, nitrogen use efficiency and nitrogen translocation to seeds. Nitrogen use efficiency among cotton genotypes ranged from 9.7% to 13.2% and 10.2% to 13.5% under ammonium sulphate and calcium nitrate fertilizers, respectively. The non-additive effects had a considerable role in controlling N use traits in cotton, as confirmed by high estimates of broad sense heritability. The constant parent regression method for estimating dominance relations suggested negative dominance with arithmetic gene action for most N use traits under both N supply forms.
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