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  • 1
    Electronic Resource
    Electronic Resource
    Coexistence and the productivity of white clover-perennial ryegrass mixtures (1989)
    Springer
    Theoretical and applied genetics 77 (1989), S. 65-70 
    Details
    ISSN: 1432-2242
    Keywords: Coexistence ; White clover ; Perennial ryegrass
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Yield comparisons between five white cloverperennial ryegrass mixtures, whose individual components had previously coexisted, and a corresponding set of ten mixtures based on components that had not coexisted disclosed a yield advantage to the former group of 8.5% over a 4-year period. All five clover populations produced their highest yields when associated with their coexisting grass. The coexisting mixtures also yielded more grass in spring, probably due to the exotic origin of the majority of the companion grasses, reinforced by the nitrogen transfer process between clover and grass. The relative proportions of clover attained by the five populations was apparently unaffected by grass companion. These results are briefly discussed in the context of improving the productivity of white clover-perennial ryegrass mixtures.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00292317
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    The three C's — competition, coexistence and coevolution — and their impact on the breeding of forage crop mixtures (1990)
    Springer
    Theoretical and applied genetics 79 (1990), S. 168-176 
    Details
    ISSN: 1432-2242
    Keywords: Competition ; Coexistence ; Coevolution ; White clover ; Perennial ryegrass
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The role of competition, coexistence and co-evolution in the formation of plant communities is discussed, particularly in relation to the breeding of improved grass/legume mixtures. Competition occurs whenever the demand for a particular resource outstrips supply, with the pressures generated within a species expected to exceed those between species. These pressures must be withstood before populations can coexist within a community. This is accomplished by a process of niche diversification, arising from temporal or spatial differences between the populations, that enables them to draw on resources not readily available to their competitors. Coexistence is crucial to the success of any breeding programme designed to raise the productivity of grass/ legume pastures, because it enables components to adapt not only to the environment which they share, but also to each other. A strategy that improves the “general ecological combining ability” of one or both components by a process of recurrent or reciprocal recurrent unilateral adaptation may prove successful, particularly if existing niche differences are increased thereby. Although both processes may give rise to populations which have apparently coevolved, only those resulting from reciprocal recurrent selection will meet the criteria of specificity and reciprocity.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00225947
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Analysing environments for plant breeding purposes as exemplified by multivariate analyses of long term wheat yields (1981)
    Springer
    Theoretical and applied genetics 59 (1981), S. 317-325 
    Details
    ISSN: 1432-2242
    Keywords: Environmental evaluation ; Plant breeding ; Multivariate analysis ; Wheat ; Climatic variable
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary A previous attempt to relate long term yields from the Western Australian wheat belt to climatic factors proved only partially successful. Here, principal component analysis has been used to examine the patterns of variability created by those socio-economic factors which may have obscured any underlying relationship which existed between yield and climate. In fact, these analyses revealed the existence of variation peculiar to particular groups of years, a result which could explain why many attempts to relate crop yields directly to climatic factors have proved unsuccessful. The plant breeding implications of these genotype x environment interactions are considered.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00264985
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Inheritance of adult field resistance to yellow rust disease among broad-based hexaploid spring wheat germplasm (1998)
    Springer
    Theoretical and applied genetics 97 (1998), S. 502-506 
    Details
    ISSN: 1432-2242
    Keywords: Key words Additivity ; Diallel cross ; Dominance ; Epistasis ; Wheat ; Yellow rust
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract  Complete F1 and F2 diallel crosses were used to investigate the inheritance of yellow rust resistance among eight bread wheat lines, developed by CIMMYT for the East African Highlands, which showed a wide response to this disease. Both diallel sets were grown at a site with a high incidence of yellow rust, although for one season, during which the F1 diallel was grown, disease incidence was unusually low. Analyses disclosed the presence of additive, dominance and epistatic effects among those genes controlling rust resistance, with the former being the most important. At normal disease levels, excluding two arrays having resistant common parents removed non-allelic interactions from the F1 diallels. For all F2 diallels, and the remaining F1 diallel, omitting two arrays based on susceptible parents removed these interactions. Local selection of material from a broadly based germplasm appears to be a feasible method of developing adapted cultivars resistant to endemic diseases.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s001220050923
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    Paper (German National Licenses)
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