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  • Articles  (2)
  • Full-sib selection  (1)
  • Spatial model  (1)
  • 1985-1989  (2)
  • 1
    Electronic Resource
    Electronic Resource
    Predicted and realized grain yield responses to full-sib family selection in CIMMYT maize (Zea mays L.) populations (1989)
    Springer
    Theoretical and applied genetics 77 (1989), S. 33-38 
    Details
    ISSN: 1432-2242
    Keywords: Multilocational progeny trials ; Full-sib selection ; Variance components ; Selection response
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The maize (Zea mays L.) improvement program of the International Maize and Wheat Improvement Center (CIMMYT) develops broad-based maize populations and, until recently, improved all of them through full-sib family selection with international testing. The purpose of this study was to estimate the genetic and genetic × environment variance components for ten of those populations and to measure expected yield improvement from full-sib selection. Mean yield ranged from 3.35–6.81 t ha−1. For five populations the average yield in the last cycle was higher than in the initial cycles. Several populations showed no improvement or yielded less in the final cycle of selection, either because selection intensity was low or because strong selection pressure was applied simultaneously for several traits. Variation resulting from differences among family means within cycles and from interaction between families and locations within cycles were significant in all populations and cycles. Results indicate that variability among full-sib families was maintained throughout the cycles for all populations. The large σ ge 2 /σ g 2 ratio shown by most populations suggests that yield response per cycle could be maximized if the environments in which progenies are tested were subdivided and classified into similar subsets. The proportion of the predicted response realized in improved yield varied for each population.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00292312
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Analysing yield stability of maize genotypes using a spatial model (1988)
    Springer
    Theoretical and applied genetics 75 (1988), S. 863-868 
    Details
    ISSN: 1432-2242
    Keywords: Spatial model ; Stability ; Maize
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The yield stability of some CIMMYT tropical maize (Zea mays L.) populations of early and intermediate maturity, measured by the performance of varieties derived from them, was determined. Results of the stability analyses, conducted over international environments from 1980 to 1983, indicated that selections from Mezcla Amarilla exhibited good stability in high yielding sites. Varieties derived from Antigua-Republica Dominicana tended to be more stable in unfavourable environments, whereas selections from Blanco Cristalino-1 and Blanco Dentado-2 were stable in both low and high production sites. The combination of enviromental factors in the specific test locations, namely Poza Rica (Mexico), Tocumen (Panama), Islamabad (Pakistan), and Ferkessedougou (Ivory Coast), allowed selection of varieties that are very stable in other regions of the world. The varieties formed on the basis of multilocational data do not seem to be any more stable than those formed using data from a single location.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00258046
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    Paper (German National Licenses)
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