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  • 1990-1994  (6)
  • allelopathy  (5)
  • Tolerance
  • Industrial Chemistry
  • 1
    Digitale Medien
    Digitale Medien
    Tolerance to ethanol's effects on operant performance in rats: role of number and pattern of intoxicated practice opportunities (1992)
    Springer
    Psychopharmacology 109 (1992), S. 112-120 
    Details
    ISSN: 1432-2072
    Schlagwort(e): Ethanol ; Operant performance ; Tolerance ; Intoxicated practice ; Compensatory behaviors ; Acute ethanol withdrawal
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Abstract Acquisition and retention of tolerance to ethanol's rate-decreasing effects on operant performance were examined in rats which received a 52-day regimen of ethanol or saline injections prior to and/or after each daily session. Eight groups of rats differed on: (a) number of days with intoxicated practice (pre-session ethanol); (b) intermittent (spaced) or daily (massed) intoxicated practice; and (c) post-session ethanol or saline on nonintoxicated practice days. Massed practice groups were given their presession saline days prior to their pre-session ethanol days. Ethanol dose-effect tests were given prior to, during, and after the chronic injection regimen. Under both spaced and massed practice conditions, the magnitude of tolerance developed increased directly with the number of pre-session ethanol days, even when absolute ethanol exposure was constant. No group showed complete tolerance loss. The post-session ethanol supplements (a) facilitated tolerance development in spaced practice groups and tolerance loss in massed practice groups, (b) blocked ethanol's low dose rate-increasing effects, and (c) produced an acute withdrawal-like performance disruption the next day. The results suggest that both intoxicated practice and practice during acute ethanol withdrawal influence the acquisition and retention of compensatory behaviors during ethanol tolerance development.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF02245488
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  • 2
    Digitale Medien
    Digitale Medien
    Sorgoleone from root exudate inhibits mitochondrial functions (1992)
    Springer
    Journal of chemical ecology 18 (1992), S. 197-207 
    Details
    ISSN: 1573-1561
    Schlagwort(e): Sorgoleone ; mitochondria ; inhibitor ; allelochemical ; allelopathy ; root exudate ; Sorghum bicolor ; electron transport
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Chemie und Pharmazie
    Notizen: Abstract The aim of this investigation was to determine if sorgoleone (SGL), a hydrophobic compound inSorghum bicolor (L.) Moench root exudate, interferes with mitochondrial functions. Tests were conducted on mitochondria isolated from etiolated soybean [Glycine max (L.) Merr.] and corn (Zea mays L.) seedlings. The data show SGL is a potent inhibitor of state 3 and state 4 respiration rates in both soybean and corn. Using either NADH, succinate, or malate as substrate, the I50 was about 0.5μM SGL for state 3 and 5.0μM for state 4 based on 0.3–0.5 mg mitochondrial protein. Absorption spectra indicate SGL blocks electron transport at theb-c 1 complex. These data show that disruption of mitochondrial function may be a mechanism of SGL-mediated growth inhibition previously reported and demonstrate a probable role of SGL inSorghum allelopathy.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00993753
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  • 3
    Digitale Medien
    Digitale Medien
    Phytotoxicity of sorgoleone found in grain Sorghum root exudates (1992)
    Springer
    Journal of chemical ecology 18 (1992), S. 1-11 
    Details
    ISSN: 1573-1561
    Schlagwort(e): Sorgoleone ; phytotoxin ; allelochemical ; allelopathy ; root exudate ; Sorghum bicolor ; Sorghums ; weed inhibition
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Chemie und Pharmazie
    Notizen: Abstract Root exudates ofSorghum bicolor consist primarily of a dihydroquinone that is quickly oxidized to ap-benzoquinone named sorgoleone. The aim of this investigation was to determine the potential activity of sorgoleone as an inhibitor of weed growth. Bioassays showed 125μM sorgoleone reduced radicle elongation ofEragrostis tef. In liquid culture, 50-μM sorgoleone treatments stunted the growth ofLemna minor. Over a 10-day treatment period, 10μM sorgoleone in the nutrient medium reduced the growth of all weed seedlings tested:Abutilon theophrasti, Datura stramonium, Amaranthus retroflexus, Setaria viridis, Digitaria sanguinalis, andEchinochloa crusgalli. These data show sorgoleone has biological activity at extremely low concentrations, suggesting a strong contribution toSorghum allelopathy.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00997160
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  • 4
    Digitale Medien
    Digitale Medien
    Effects of salicylic acid on plant-water relationships (1993)
    Springer
    Journal of chemical ecology 19 (1993), S. 237-247 
    Details
    ISSN: 1573-1561
    Schlagwort(e): Salicylic acid ; allelopathy ; plant-water status ; water stress ; 13C ; carbon isotopes ; soybean ; Glycine max
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Chemie und Pharmazie
    Notizen: Abstract Soybean seedlings [Glycine max (L.) Merr.] were used as the test species to study the allelopathic influence of salicylic acid (SA) on short- and long-term plant water status. Plants were grown in greenhouse conditions in nutrient culture medium amended with SA. Treatments were initiated 10 days after germination and continued for either 14 or 28 days. The threshold for inhibition of seedling growth over a 28-day treatment was 0.15 mM SA. Seedlings grown with 0.3 mM SA consistently had higher leaf diffusive resistance and lower transpiration and water potentials than control plants. The stable carbon isotope ratio (13C:12C) in tissue from both the 0.15 and 0.30 mM SA-treated plants was significantly higher than control seedlings, indicating SA caused a chronic water stress during the 28-day treatment. These data show that an interference with plant-water relationships is one mechanism whereby this allelochemical inhibits plant growth.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00993692
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  • 5
    Digitale Medien
    Digitale Medien
    Effects of juglone on growth, photosynthesis, and respiration (1993)
    Springer
    Journal of chemical ecology 19 (1993), S. 559-568 
    Details
    ISSN: 1573-1561
    Schlagwort(e): Juglone ; allelopathy ; allelochemical ; photosynthesis ; chioroplast ; mitochondria ; Lemna minor ; Glycine max
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Chemie und Pharmazie
    Notizen: Abstract The impacts of juglone on plant growth and several other physiological functions were evaluated in this study. Juglone inhibitedLemna minor growth, chlorophyll content, and net photosynthesis at treatments between 10 and 40μM. Soybean leaf disks vacuum infiltrated with as little as 10μM juglone had reduced photosynthesis. Oxygen evolution by chloroplasts isolated fromPisum sativum was inhibited by juglone with an I50 of 2μM. Micromolar treatments of juglone stimulated oxygen uptake in mitochondria isolated fromGlycine max. These data suggest perturbations of chloroplast and mitochondrial functions may contribute to plant growth reductions observed in juglone-mediated allelopathy.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00994325
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  • 6
    Digitale Medien
    Digitale Medien
    Effects of root exudate sorgoleone on photosynthesis (1993)
    Springer
    Journal of chemical ecology 19 (1993), S. 369-375 
    Details
    ISSN: 1573-1561
    Schlagwort(e): Sorgoleone ; allelochemical ; allelopathy ; photosynthesis ; chloroplast ; root exudate ; Sorghum bicolor
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Chemie und Pharmazie
    Notizen: Abstract The aim of this investigation was to determine if sorgoleone (SGL), ap-benzoquinone inSorghum bicolor root exudate, is a photosynthesis inhibitor. Assays usingGlycine max leaf disks showed concentrations as low as 10μM SGL inhibited oxygen evolution more than 50%. Tests conducted on chloroplasts isolated fromPisum sativum showed that SGL is a powerful inhibitor of CO2-dependent oxygen evolution. Using a chloroplast suspension equivalent to 80–100μg chlorophyll, the I50 was approximately 0.2μM SGL. These data indicate inhibition of photosynthesis is part of the explanation for growth reduction caused by this allelochemical.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00993702
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