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Single and Multiple Traits Selection in a Segregating Population of Wheat, Triticum aestivum L.
Author(s) -
Mahdy E. E.
Publication year - 1988
Publication title -
plant breeding
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.583
H-Index - 71
eISSN - 1439-0523
pISSN - 0179-9541
DOI - 10.1111/j.1439-0523.1988.tb00293.x
Subject(s) - biology , selection (genetic algorithm) , culling , trait , agronomy , grain yield , population , genetic gain , yield (engineering) , plant breeding , horticulture , genetic variation , zoology , demography , genetics , gene , herd , materials science , artificial intelligence , sociology , computer science , metallurgy , programming language
The breeding materials used in this study were the F 3 , F 4 and F 5 ‐generations of the cross between Giza 158 × Sonora 64 ( Triticum aestivum L.). The objective of this study was to compare the relative merits of Smith‐Hazel, desired gain selection indices, independent culling levels and single trait selection in improving grain yield, heading date and several agronomic traits. Highly significant differences among F 3 families and a satisfactory genotypic coefficient of variability were obtained for all the traits studied. The genotypic correlations were high between yield and each of spike weight, kernels/spike and spikes; plant, intermediate with 1000 kernel weight and very low with heading date, plant height and spike1 length‐After two cycles of selection, the results of the gains realized indicated that the most effective method for improving yield was the Smith‐Hazel index (SH 7 ) of seven traits followed by the desired gain index of seven traits (DG 7 ), SH 5 , independent culling levels, DG 5 and direct selection (or grain yield/plant. Direct selection for heading date, plant height and spike length was the best method for improving these traits, but undesirable correlated responses in the other traits were obtained.