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  • 1
    Electronic Resource
    Electronic Resource
    Interaction between a plant-derived smoke extract, light and phytohormones on the germination of light-sensitive lettuce seeds (1995)
    Springer
    Plant growth regulation 17 (1995), S. 213-218 
    Details
    ISSN: 1573-5087
    Keywords: germination ; gibberellins ; Lactuca sativa Grand Rapids ; licase Phytohormones ; smoke extract
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Plant-derived smoke extracts mimics the effect of red light on germination in light-sensitive lettuce seeds and partially overcomes the inhibitory effect of far-red light. Interaction between a smoke extract and gibberellins, cytokinins, abscisic acid and ethephon was investigated. Smoke acted synergistically with GA3 and increased the sensitivity of the lettuce seeds to ABA. It seems likely that smoke affects membrane permeability or receptor sensitivity rather than influencing the phytochrome system of these seeds.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00024728
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Effect of a plant-derived smoke extract, N6-benzyladenine and gibberellic acid on the thermodormancy of lettuce seeds (1996)
    Springer
    Plant growth regulation 19 (1996), S. 97-100 
    Details
    ISSN: 1573-5087
    Keywords: gibberellic acid ; Lactuca sativa L. cv. Grand Rapids ; N6-benzyladenine ; smoke extract ; thermodormancy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract The effects of a plant-derived smoke extract, BA and GA3 on the thermodormancy of Grand Rapids lettuce seeds were studied. Thermodormant lettuce seeds treated either with BA, GA3 or smoke extract alone did not germinate. Combinations of BA with smoke extract and BA with GA3 were most effective in overcoming induced thermodormancy. GA3 plus smoke did not break the induced thermodormancy. The effects of the different treatments on germination were concentration dependent. BA was most effective at 10−5 to 10−3 M in combination with smoke dilutions 1:5,000 to 1:1,000,000 in overcoming thermodormancy.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00024574
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    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    The effect of ethylene, octanoic acid and a plant-derived smoke extract on the germination of light-sensitive lettuce seeds (1996)
    Springer
    Plant growth regulation 19 (1996), S. 197-201 
    Details
    ISSN: 1573-5087
    Keywords: ethylene ; Lactuca sativa L.cv. Grand Rapids ; octanoic acid ; seed germination ; smoke extract
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract The effects of an aqueous plant-derived smoke extract, octanoic acid and ethylene on germination of light-sensitive Grand Rapids lettuce seeds were investigated. The smoke extract brought about a concentration dependent increase in germination and a complete inhibition of germination at high concentrations. Octanoic acid could not induce germination. Ethylene at concentrations over 5 μL L−1 increased lettuce seed germination, but not to the same degree as smoke. Aqueous smoke in combination with ethylene showed a synergistic effect on germination at suboptimal smoke concentrations. At high smoke concentrations the effect of ethylene was almost completely inhibited. Octanoic acid in combination with ethylene brought about a higher level of germination than with ethylene alone, but only at the highest concentration of octanoic acid tested (1 mM). Standardized hexane and dichloromethane-partitioned smoke extracts and octanoic acid were subjected to TLC separation. The R f -fractions in the smoke lanes showing activity in the lettuce seed bioassay did not correspond to the R f -value of octanoic acid. As aqueous smoke can withstand autoclaving and can be separated by TLC and HPLC without loosing activity it is unlikely that the activity of aqueous smoke is linked to ethylene. It thus appears that the active compound in smoke is neither octanoic acid nor ethylene.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00037791
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    Paper (German National Licenses)
    Fulltext
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