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  • Nitrogen  (11)
  • Evolution  (8)
  • Springer  (19)
  • American Chemical Society
  • Elsevier
  • 2000-2004
  • 1985-1989  (19)
  • 1986  (19)
Collection
Keywords
Publisher
Years
  • 2000-2004
  • 1985-1989  (19)
Year
  • 1
    Electronic Resource
    Electronic Resource
    Multiline varieties and disease control (1986)
    Springer
    Theoretical and applied genetics 71 (1986), S. 801-809 
    Details
    ISSN: 1432-2242
    Keywords: Multiline varieties ; Disease control ; “Dirty crop” approach ; Evolution ; Pathogens
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Existing theoretical models have led to conflicting predictions concerning the likely effect of the widespread use of dirty crop multilines on the evolution of virulence in pathogen populations. Here we attempt to clarify these problems by extending existing models to include selection against unnecessary genes for virulence at two different stages in the life cycle of the pathogen. The results of these studies indicate that the stage of the life cycle at which selection occurs can significantly influence the evolution of virulence in pathogen populations growing on multiline varieties.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00276421
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  • 2
    Electronic Resource
    Electronic Resource
    Covered and naked barleys from the Himalaya (1986)
    Springer
    Theoretical and applied genetics 71 (1986), S. 730-735 
    Details
    ISSN: 1432-2242
    Keywords: Barley ; Hordeum ; Himalaya ; Evolution ; Phylogeny
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Both reciprocal averaging and discriminant analysis confirm visual impressions that covered and naked barleys from several areas in the Himalaya differ significantly from each other in a multivariate way. Discriminant analysis also suggests similar differences between the ‘occidental’ and ‘oriental’ barleys of Takahashi (1955). Either distinction has implications for our understanding of barley phylogeny and evolution.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00263271
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  • 3
    Electronic Resource
    Electronic Resource
    Genetic changes under domestication in Vicia faba (1986)
    Springer
    Theoretical and applied genetics 72 (1986), S. 364-372 
    Details
    ISSN: 1432-2242
    Keywords: Inheritance ; Evolution ; Vicia faba ; Domestication
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The components of variation within each one of two sets of landraces and/or cultivars of Vicia faba, respectively constituted of primitive and advanced morphological types, were studied by means of two sets of 8 × 8 diallel crosses with two repetitions. The results show that primitive and modern forms differ from each other in both the intensity and the kind of selective pressures acting on them, mainly on those characters more modified through the domestication process: i.e., seed morphology and the number of flowers per node. Because of the paramount importance of the additive component in the primitive forms, it is suggested that the most important type of selection on them is the stabilizing one. On the contrary, in the most advanced forms the selection is directional and disruptive : directional towards greater yields, and disruptive separating two morphological types, ‘major’ and ‘equina’. The plant response to these different selective pressures has been to modify the genetic control of different characters: thus the primitive forms generally show only additivity while the most advanced forms show additivity as well as directional and asymmetrical dominance.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00288574
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  • 4
    Electronic Resource
    Electronic Resource
    Covered and naked barleys from the Himalaya (1986)
    Springer
    Theoretical and applied genetics 71 (1986), S. 736-741 
    Details
    ISSN: 1432-2242
    Keywords: Barley ; Hordeum ; Himalaya ; Evolution ; Phylogeny
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Covered and naked barleys from the Himalaya differ significantly from each other in a multivariate way (Murphy and Witcombe 1986). Two hypotheses which could account for this phenomenon are (1) that the caryopsis covering gene (or a gene closely linked with it) exerts a wide-ranging pleiotropic effect, and (2) that the covered and naked types have evolved to differ with respect to the alleles fixed at many loci. Experimental evidence is presented which supports the latter, an explanation which has implications for our understanding of barley phylogeny and evolution.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00263272
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  • 5
    Electronic Resource
    Electronic Resource
    Phosphorus deficiency induced by nitrogen input in Douglas fir in the Netherlands (1986)
    Springer
    Plant and soil 95 (1986), S. 191-200 
    Details
    ISSN: 1573-5036
    Keywords: Atmospheric input ; Douglas fir Fertilization ; Foliar analysis ; Forest nutrition ; N/P ratio ; Nitrogen ; Nutrient status ; Phosphorus
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary A re-examination of earlier NPK fertilization experiments in Douglas fir stands on sandy soils shows the effects of high nitrogen input by air pollution during the last 10–15 years on plant nutrition at these sites. In 1960, experimental plots showed a positive growth reaction to nitrogen, phosphorus, and potassium fertilization. All suffered from severe phosphorus deficiency in 1984, low phosphorus in the needles was invariably accompanied by a high nitrogen content, with all N/P ratios between 20 and 30. The same conclusion emerges from an independent investigation of nutrient status of a selection of Douglas fir stands. Hence, if stand productivity and a balanced nutrient status of the trees is to be maintained, the increase in atmospheric input of nitrogen calls for supplementary fertilization. Given the current N/P ratios in the needles, a positive growth response to phosphorus fertilization is to be expected.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02375071
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  • 6
    Electronic Resource
    Electronic Resource
    Varietal and fertilizer effects on straw phytotoxins (1986)
    Springer
    Biology and fertility of soils 2 (1986), S. 109-112 
    Details
    ISSN: 1432-0789
    Keywords: Straw ; Phytotoxins ; Acetic Acid ; Wheat ; Barley ; Cultivar ; Nitrogen
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Geosciences , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Acetic acid production over 10 days from fresh barley straw was greater than that from fresh wheat straw, but there were only minor consistent differences between different cultivars. The effect depended on the soil type on which the straw had been produced and acid production was greatest with the largest amounts of N fertilizer which had been used. The fertilizer also affected the C:N ratio of the straw
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00257588
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  • 7
    Electronic Resource
    Electronic Resource
    Evolutionary role of posttranslational modifications of proteins, as illustrated by the glycosylation characteristics of the digestive enzyme pancreatic ribonuclease (1986)
    Springer
    Journal of molecular evolution 24 (1986), S. 118-120 
    Details
    ISSN: 1432-1432
    Keywords: Glycoprotein ; Evolution ; Ribonuclease
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The glycosylation characteristics of the digestive enzyme ribonuclease are summarized. The evolutionary role of this posttranslational modification is discussed and evidence is presented that selection has much influence on the presence or absence of carbohydrate in glycoproteins and on the positions of the carbohydrate attachment sites.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02099959
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  • 8
    Electronic Resource
    Electronic Resource
    Receptors for intercellular messenger molecules in microbes: Similarities to vertebrate receptors and possible implications for diseases in man (1986)
    Springer
    Cellular and molecular life sciences 42 (1986), S. 782-788 
    Details
    ISSN: 1420-9071
    Keywords: Evolution ; receptors ; plant hormones
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01941525
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  • 9
    Electronic Resource
    Electronic Resource
    Comparative physiology of burned and unburned Rhus laurina after chaparral wildfire (1986)
    Springer
    Oecologia 71 (1986), S. 63-68 
    Details
    ISSN: 1432-1939
    Keywords: Rhus ; Lignotuber ; Nitrogen ; Water relations ; Fire
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Laurel Sumac (Rhus laurina) is a dominant member of the coastal chaparral community of southern California that survives periodic burning by wildfires by resprouting from a lignotuber (root crown). We investigated the physiological basis for resprouting by comparing shoot elongation, leaf nitrogen content, tissue water status, leaf conductance to water vapor diffusion, and photosynthetic rates of post-fire R. laurina to those of adjacent unburned shrubs. Resprouts had higher rates of shoot elongation, leaf conductance, and photosynthesis than mature, unburned shrubs. Leaf nitrogen contents were elevated in burned shrubs even though their leaves developed interveinal chlorosis. A comparison of soil water potential to predawn water potential indicated that roots of R. laurina remain active below 2 m during the first summer drought after wildfire. Our results support the hypothesis that lignotubers not only contain dormant buds that develop into aerial shoots after wildfire but they also supply nutrient resources that enhance shoot elongation. Because R. laurina is relatively sensitive to drought, yet very successful in its rapid recovery after fire, maintaining an active root system after shoot removal may be the primary function of the massive lignotuber formed by this species.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00377322
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  • 10
    Electronic Resource
    Electronic Resource
    Mistletoes: a hypothesis concerning morphological and chemical avoidance of herbivory (1986)
    Springer
    Oecologia 70 (1986), S. 234-237 
    Details
    ISSN: 1432-1939
    Keywords: Mimicry ; Nitrogen ; Herbivory ; Mistletoe ; Australia
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Leaves from many misletoe species in Australia strongly resemble those of their hosts. This cryptic mimicry has been hypothesized to be a means of reducing the likelihood of mistletoe herbivory by vertebrates. Leaf Kjeldahl nitrogen contents (a measure of reduced nitrogen and thus amines, amino acids and protein levels) of mistletoes and their hosts were measured on 48 mimetic and nonmimetic host-parasite pairs to evaluate hypotheses concerning the significance of crysis versus noncrypsis. The hypothesis that mistletoes mimicking host leaves should have higher leaf nitrogen levels than their hosts is supported; they may be gaining a selective advantage through crypsis (reduced herbivory). The second hypothesis that mistletoes which do not mimic their hosts should have lower leaf nitrogen levels than their hosts is also supported; they may be gaining a selective advantage through noncrypsis (reduced herbivory resulting from visual advertisement of their reduced nutritional status).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00379245
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