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  • 1
    Electronic Resource
    Electronic Resource
    Cross prediction studies on spring barley (1983)
    Springer
    Theoretical and applied genetics 64 (1983), S. 345-352 
    Details
    ISSN: 1432-2242
    Keywords: Cross prediction ; Genetical control ; Spring barley ; Height and maturity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The genetical and environmental control of three height characters, two maturity characters and neck length in five barley pair crosses was studied using both F2 triple test cross and model fitting analysis. Significant additive and dominance effects were found for all six characters with some evidence of epistasis for each character. Generally, dominance was incomplete for the height characters but was significantly directional for increased height in those crosses where dwarfing genes were segregating. Variable dominance effects were found for both the maturity characters. Complete dominance was found in three cases, otherwise incomplete dominance was found. Significant directional dominance for earliness was found for both maturity characters in one cross but this was attributed to the presence of a daylength insensitivity factor in one of the parents. Most of the genetic variation for neck length was additive, though some evidence of dominance was found. Broad sense and narrow sense heritability estimates generally were found to be high for the height and maturity characters but low for neck length. It was concluded that early generation selection for height at ear emergence, for final height and for awn emergence was worthwhile. Early generation selection for neck length was not recommended from the results of this study.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00274178
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  • 2
    Electronic Resource
    Electronic Resource
    Cross prediction studies on spring barley (1983)
    Springer
    Theoretical and applied genetics 64 (1983), S. 353-358 
    Details
    ISSN: 1432-2242
    Keywords: Cross prediction ; Genetical control ; Spring barley ; Yield ; Yield components
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The genetical and environmental control of yield and its components in spring barley, tillers per plant, grain number and grain weight has been investigated by triple test cross and linear modelfitting analyses. Additive and dominance effects were observed for both grain number and grain weight, but tiller number was almost totally controlled by environmental factors. Epistatic effects were usually absent, only grain number exhibited such effects. The heritabilities of the yield components varied from low (0.15) for tiller number to high (0.51) for grain weight. Yield itself, measured on a single plant basis was mainly under additive and dominance control, with little evidence for epistasis. The heritability for single plant yield was low (0.22). The possibilities for early generation selection for yield are discussed, and the relative contributions of each genetic and environmental component are described.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00274179
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  • 3
    Electronic Resource
    Electronic Resource
    Aggregation pheromone of the deodar weevll,Pissodes nemorensis (Coleoptera: Curculionidae): Isolation and activity of grandisol and grandisal (1984)
    Springer
    Journal of chemical ecology 10 (1984), S. 1417-1423 
    Details
    ISSN: 1573-1561
    Keywords: Pissodes nemorensis ; deodar weevil ; Coleoptera ; Curculionidae ; aggregation pheromone ; grandisol ; grandisal ; synergism
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract The bark weevilPissodes nemorensis, a pest of pines and exotic cedars in the southeastern United States, utilizes a male-produced aggregation pheromone. The presumed pheromone components, grandisol (cis-2-isopropenyl-1-methylcyclobutaneethanol) and its corresponding aldehyde, grandisal, were isolated from extracts of male volatiles and male hindguts. A field test in northern Florida showed that the combination of grandisol, grandisal, and slash pine (Pinus elliottii) bolts acted synergistically to attract large numbers of male and femaleP. nemorensis. These components deployed in various paired combinations were not as attractive as the tripartite mixture. There was no evidence that flying weevils were attracted to unbaited pine bolts. The aggregation pheromone forP. nemorensis appears to be similar to that of a parapatric sibling species,P. approximatus.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00990312
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  • 4
    Electronic Resource
    Electronic Resource
    Aggregation pheromone components of two species ofPissodes weevils (Coleoptera: Curculionidae) Isolation, identification, and field activity (1983)
    Springer
    Journal of chemical ecology 9 (1983), S. 1-12 
    Details
    ISSN: 1573-1561
    Keywords: Pissodes strobi ; Pissodes approximatus ; Coleoptera ; Curculionidae ; aggregation pheromone ; grandisol ; grandisal ; Pinus strobus ; white pine weevil
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract Two related volatile compounds were identified from each of two species ofPissodes bark weevils and implicated as components of their aggregation pheromones. Grandisol (cis-2-isopropenyl-1-methylcyclobutaneethanol), and its corresponding aldehyde, grandisal, were isolated from males of bothP. strobi andP. approximatus and were found in the abdomens and hindguts of the respective species. In field tests synthetic grandisol and grandisal together with odors from cut pine acted synergistically in attracting both sexes ofP. approximatus. This response was similar to that elicited by maleP. approximatus feeding on cut pine. Males and females of natural populations ofP. strobi were more responsive to caged males feeding on leaders of white pine than they were to leaders alone. The combination of grandisol, grandisal, and leaders was less attractive than males on leaders, but more attractive than leaders alone. From isolation of pheromone components at different times of the year, it was determined that males of both species produced grandisol and grandisal only at times when cohort females were reproductively mature.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00987766
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