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  • 1
    Electronic Resource
    Electronic Resource
    Comparison of trait associations in adapted × exotic matings of sorghum developed by two introgression methods (1994)
    Springer
    Theoretical and applied genetics 88 (1994), S. 877-884 
    Details
    ISSN: 1432-2242
    Keywords: Trait associations ; Introgression methods ; Principal components
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The association among six traits in the F2 lines derived from adapted × exotic backcrosses of sorghum developed via two introgression methods was studied using principal component analysis. The first principal component defined a hybrid index in matings of the wild accession (‘12–26’) but not in matings of the cultivated sorghum genotypes (‘Segeolane’ and ‘SC408’), no matter which adapted parent was used. This component accounted for 27–42% of the total variation in each mating. The ‘recombination spindle’ was wide in all matings of CK60 and KP9B, which indicated that the relationships among traits were not strong enough to restrict recombination among the parental characters. The index scores of both CK60 and KP9B matings showed clear differentiation of the backcross generations only when the exotic parent was the undomesticated wild accession (‘12–26’). None of the distributions of the first principal component scores in any backcross population was bimodal. The frequency of recombinant genotypes derived from a mating was determined by the level of domestication and adaptation of the exotic parent and the genetic background of the adapted parent. Backcrossing to a population (KP9B) was found to be superior to backcrossing to an inbred line (CK60) to produce lines with an improved adapted phenotype.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01254000
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Comparisons of methods for introgressing exotic germ plasm into adapted sorghum (1994)
    Springer
    Theoretical and applied genetics 89 (1994), S. 233-239 
    Details
    ISSN: 1432-2242
    Keywords: Sorghum ; Introgression methods ; Exotic germ plasm
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The incorporation of exotic germ plasm into breeding populations can broaden and diversify the genetic base of adapted genotypes. To more effectively utilize the genetic resources existing in Sorghum bicolor (L.) Moench, a rapid and efficient method of incorporating exotic genotypes into adapted populations is needed. Therefore, this study was conducted to compare the effectiveness of backcrossing to a broad-based population versus backcrossing to an inbred line for developing improved lines from adapted x exotic crosses. A wild sorghum, a cultivated landrace, and a converted sorghum line were crossed to an inbred line (CK60) and a broad-based population (KP9B). After two generations of backcrossing to the respective adapted parent, 50 F2 lines were derived from each of the backcross generations of every mating and evaluated at three test environments. Backcrossing to an inbred line (CK60) gave fewer high-yielding segregates and generated less genetic variation than backcrossing to a population (KP9B). Also, the number of agronomically acceptable lines derived from each CK60 mating was fewer than that derived from the corresponding mating with KP9B. Overall, the use of a broad-based population as an adapted recurrent parent for introgressing exotic genotypes may provide good opportunities for developing suitable inbred lines from adapted x exotic backcrosses.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00225147
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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