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  • 1
    Electronic Resource
    Electronic Resource
    Volatile methyl ketone seed-germination inhibitors fromAmaranthus palmeri S. Wats. Residues (1988)
    Springer
    Journal of chemical ecology 14 (1988), S. 1617-1631 
    Details
    ISSN: 1573-1561
    Keywords: Allelopathy ; volatile allelochemicals ; methyl ketones ; germination inhibitors ; onion ; Allium cepa ; carrot ; Daucus carota ; Palmer amaranth ; Amaranthus palmeri ; tomato ; Lycopersicon esculentum
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract The effects of nine methyl ketones previously identified in the mixture of volatiles released byAmaranthus palmeri (AMAPA) residues upon onion, carrot, AMAPA, and tomato seed germination were determined. Three-day exposures to these volatiles significantly inhibited germination of all assay seeds, and the degree of inhibition was dependent upon seed species, exposure time, and concentration. Based on the degree of inhibition observed in both time- and concentration-dependent assays, the following activity series was obtained: 2-octanone, 2-nonanone 〉 2-undecanone 〉 2-heptanone 〉 2-hexanone, 3-methyl-2-butanone, 2-pentanone, 3-hydroxy-2-butanone 〉 2-butanone. The activities of these compounds appear to be additive and dependent on relative volatility and hydrophilicity.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01012527
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Seed-germination inhibition by volatile alcohols and other compounds associated withAmaranthus palmeri residues (1988)
    Springer
    Journal of chemical ecology 14 (1988), S. 1633-1648 
    Details
    ISSN: 1573-1561
    Keywords: Allelopathy ; volatile allelochemicals ; alcohols ; aldehydes ; germination inhibitors ; onion ; Allium cepa ; carrots ; Daucus carota ; Palmer amaranth ; Amaranthus palmeri ; tomato ; Lycopersicon esculentum
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract Effects of 3-pentanone and eight low molecular weight aliphatic alcohols and aldehydes identifed in the mixtures of volatiles released byAmaranthus palmeri S. Wats. (AMAPA) residues were determined on germination of onion, carrot, AMAPA, and tomato seeds. Three-day exposures to these volatiles significantly inhibited germination of these assay seeds, and the inhibition was dependent upon exposure time and concentration. Based on the degree of inhibition observed in both time- and concentration-dependent assays, the following activity series was obtained: 2-heptanol 〉 3-methyl-1-butanol, 1-hexanol 〉 hexanal, 1-pentanol, 3-pentanone, acetaldehyde 〉 ethanol, 2-methyl-1-propanol. The activities of this group of compounds with that of 2-heptanone appear to be additive and related to test compound volatility and hydrophilicity. 2-Heptanol and 2-heptanone also significantly inhibited the germination of other species, including shepherdspurse, soybean, lettuce, alfalfa, common purslane, oats, and lovegrass.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01012528
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    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Allelochemicals from palmer amaranth,Amaranthus palmeri S. Wats (1987)
    Springer
    Journal of chemical ecology 13 (1987), S. 185-202 
    Details
    ISSN: 1573-1561
    Keywords: Allelopathy ; seed germination ; Amaranthus palmeri ; Allium cepa ; Daucus carota ; Lycopersicon esculentum ; onion ; carrot ; tomato ; volatiles ; aqueous extracts ; weed residues
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract The presence of Palmer amaranth (AMAPA) residues in the soil reduced fresh weight accumulation in onions and carrots and markedly decreased seedling field establishment of carrots. Solid-phase separation techniques were used to isolate fractions containing water-soluble organic compounds from AMAPA residues and soil amended with such residues. At concentrations of 20–100 mg/liter most of the organic solids thus extracted were inactive in seed germination assays using onion, carrot, AMAPA, and tomato seeds. Extracts from the roots of AMAPA increased 72-hr germination percentages in carrot, AMAPA, and tomato. A time-study of AMAPA residue decomposition in soil showed an increase in extractable inhibitors of onion germination after 62 days but no other significant changes in the activity. The most active allelochemicals from AMAPA proved to be volatile compounds. Volatiles emitted by soil containing AMAPA residues and by the dried and partially rehydrated leaf and flower residues themselves reduced carrot and tomato seed germination to less than 7%. Freshly harvested aerial AMAPA inhibited only carrot seed. Germination of AMAPA and carrot seeds was retarded by exposure to volatiles from dried AMAPA residues. Residues from AMAPA grown in Texas and Louisiana exhibited comparable inhibitory activity after air-drying two weeks. Onion seeds were also inhibited by volatiles from AMAPA residues.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01020362
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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