Comparison of bread wheat lines selected by doubled haploid, single-seed descent and pedigree selection methods |
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Authors: | M N Inagaki G Varughese S Rajaram M van Ginkel A Mujeeb-Kazi |
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Institution: | (1) International Maize and Wheat Improvement Center (CIMMYT), Lisboa 27, Colonia Juárez, Apartado Postal 6-641, 06600, Mexico, D.F., Mexico, MX |
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Abstract: | Yield performance of each group of ten spring bread wheat lines selected by doubled haploid (DH), single-seed descent (SSD)
and pedigree selection (PS) methods from three F1 crosses was compared with the aim of evaluating the DH method in breeding programs. Populations of 65–97 DH lines and 110
SSD lines per cross were used for selection. PS lines were developed by repeated selections from 1500 F2 plants. Yield evaluation was performed at the F6 generation of SSD and PS lines along with DH lines in a 2-year field experiment. It took only 2 years from the planting of
wheat materials for DH production to the planting of selected DH lines for yield evaluation. There was no significant difference
in grain yield between DH lines and PS lines selected from an F1 cross whose parental varieties were closely related in their pedigrees. In two crosses with low coefficients of parentage
and a large variation in their progenies, grain yield of selected DH lines was significantly lower than those of selected
SSD and PS lines. These results confirm that the DH method can save time in obtaining recombinant inbred lines ready for yield
evaluation. However, a larger DH population is required to achieve the same level of genetic advance with the PS method in
crosses containing greater genetic variation.
Received: 23 December 1997 / Accepted: 12 March 1998 |
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Keywords: | Bread wheat Doubled haploids Pedigree selection Single-seed descent |
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