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  • 1
    Electronic Resource
    Electronic Resource
    High-performance liquid chromatography of plant hormones - II. Determination of plant hormones of the indole type
    Amsterdam : Elsevier
    Journal of Chromatography A 286 (1984), S. 237-245 
    Details
    ISSN: 0021-9673
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/S0021-9673(01)99191-5
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    High-performance liquid chromatography of plant hormones
    Amsterdam : Elsevier
    Journal of Chromatography A 191 (1980), S. 129-136 
    Details
    ISSN: 0021-9673
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/S0021-9673(00)86372-4
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    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    High-performance liquid chromatography of plant hormones
    Amsterdam : Elsevier
    Journal of Chromatography A 191 (1980), S. 129-136 
    Details
    ISSN: 0021-9673
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1016/S0021-9673(00)86372-4
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    Paper (German National Licenses)
    Fulltext
  • 4
    Electronic Resource
    Electronic Resource
    Root exudates of plants (1980)
    Springer
    Plant and soil 57 (1980), S. 69-83 
    Details
    ISSN: 1573-5036
    Keywords: Bacteria ; Concentration gradient ; Exudates ; Pseudomonas putida ; Root exudation ; Wheat
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary The release of substances from wheat roots was found to be directly related to the growth of the root system. Plants whose root system did not grow released almost no exudates. When exudate concentration in the vicinity of the roots was lowered by frequent replacements of the nutrient solution or by a simultaneous cultivation of exudate-utilizing bacteria, the release of exudates was enhanced. In axenic wheat cultures, the amount of exudates during a 12-day cultivation with 2- or 4-day intervals between medium replacements represented 50% of root dry weight and 12% of whole plant dry weight. Wheat plants cultivated in the presence of the bacteriumPseudomonas putida released up to double the amount of exudates compared with axenic variants.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02139643
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Rhizosphere micro-organisms in relation to the apple replant problem (1982)
    Springer
    Plant and soil 69 (1982), S. 187-197 
    Details
    ISSN: 1573-5036
    Keywords: Apple monoculture ; Phytotoxins ; Replant problem ; Rhizoplane ; Rhizosphere ; Root exudates ; Soil micro-organisms ; Soil sickness
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary One of the factors giving rise to soil sickness in apple orchards is the rhizosphere microflora. The composition of the microbial coenosis in the rhizosphere changes with increasing age of the apple trees. An increase in the counts of micromycetes and actinomycetes and a decrease in bacterial counts was found in agreement with the decreasing pH of the rhizosphere soil. The presence of fluorescent pseudomonads in the rhizosphere of old apple trees was rare, but the planting of apple seedling into sick soil induced their proliferation. The relative proportion of individual genera of micromycetes changed according to the tree age; fungi of the genus Mucor were more often found in the rhizosphere of younger trees than in that of older ones while fungi of the genus Penicillium had an opposite trend. Biological tests showed that Penicillium fungi form the majority of the phytotoxic microflora. The amount of phytotoxic micromycetes was higher in ‘sick’ soil as compared with control soil in which apple trees had not been grown for at least 15 years. Higher numbers of phytotoxic micromycetes were isolated also from the rhizosphere of apple seedlings grown in ‘sick’ soil as compared with those growing in control soil. An increase in the amount of phytotoxic micromycetes in apple tree rhizosphere could be induced by mere addition of 5% (w/w) ‘sick’ soil to the soil in which apple trees were grown for the first time. By adding sterilized ‘sick’ soil, the amount of phytotoxic micromycetes in the apple seedling rhizosphere was not affected. Increased numbers of phytotoxic micromycetes affected negatively the growth of apple trees and the morphology of apple tree roots. This demonstrated the possibility of transfer of a factor participating in the etiology of soil sickness in apple orchards.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02374514
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  • 6
    Electronic Resource
    Electronic Resource
    Artificial induction of the apple replant problem byPenicillium claviforme inoculation (1988)
    Springer
    Plant and soil 107 (1988), S. 127-136 
    Details
    ISSN: 1573-5036
    Keywords: apple monoculture ; inoculation ; phytotoxins ; Penicillium claviforme ; Pseudomonas putida ; replant problem ; rhizoplane ; rhizosphere ; root exudates ; soil micro-organisms ; soil sickness
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Inoculation of apple seedling roots withPenicillium claviforme reduced plant growth and resulted in morphological changes of roots resembling those found in seedlings growing in ‘apple replant problem’ soil (apple-sick soil). The introduced fungus persisted in the rhizosphere throughout the 30-month test period. The numbers of colony-forming units (CFU) ofPenicillium claviforme, as well as the ‘total’ number of CFU of micromycetes, were higher in the rhizoplane of the inoculated seedling in comparison with uninoculated plants. The numbers of CFU of phytotoxic micromycetes in the rhizosphere soil of inoculated seedlings were also proportionally higher. Apple tree growth was also reduced when seedlings were inoculated with the flucrescent bacteriumPseudomonas putida; however, no morphological changes were observed in the roots. Both micro-organisms introduced into the apple seedling rhizosphere caused changes in the microbial community. Inoculation withPenicillium claviforme andPseudomonas putida caused a decrease in the number of mycolytic bacteria in the rhizoplane of apple seedlings.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02371554
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    Paper (German National Licenses)
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