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  • Lactuca sativa L.  (1)
  • cultivar  (1)
  • Springer  (2)
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  • Springer  (2)
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  • 1
    Electronic Resource
    Electronic Resource
    Tiller expansion and retranslocation of previously absorbed nitrogen among main stems, tillers and roots of two barley cultivars (1987)
    Springer
    Plant and soil 102 (1987), S. 61-64 
    Details
    ISSN: 1573-5036
    Keywords: barley ; cultivar ; main stem ; net flux ; nitrogen ; partitioning ; root ; tiller ; vegetative adaptation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Barley plants (Hordeum vulgare L. cvs Hellas and Kajsa), grown in nutrient solutions, were supplied with15NO 3 − from day 12 to day 16. Changes in distribution of15N between different plant parts were followed during ageing, (days 16, 28 and 52) to study differences in redistribution of N induced by variation in NO 3 − supply and choice of cultivar. Main stems and tillers competed for previously absorbed N and their competitive strength depended on their growth rate. Inhibition of tillering during N stress protected the main stem from detrimental losses of a limiting resource. Tillers on Hellas received in most cases proportionally more15N from the rest of the plant than tillers on Kajsa.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02370901
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  • 2
    Electronic Resource
    Electronic Resource
    Interactive effects of lettuce (Lactuca sativa L.), irradiance, and ferulic acid in axenic, hydroponic culture (1999)
    Springer
    Plant and soil 210 (1999), S. 115-126 
    Details
    ISSN: 1573-5036
    Keywords: axenic ; closed hydroponic culture ; phenolic acids ; irradiance ; Lactuca sativa L. ; root morphology
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Ferulic acid (FA) is released by living roots and by decaying plant material and is involved in chemical interactions between plants. Effects of FA on plant growth and root development of lettuce (Lactuca sativa L. cv. Grand Rapids) cultivated in axenic nutrient solution were studied in two factorial experiments. Root and shoot growth was impeded when 200 μM trans-FA was added to the nutrient solution and the light intensity was in the range of 250–380 μmol m-2 s-1. Root growth showed a stronger response to FA than did shoot growth. At 200 μM, FA strongly inhibited root hair formation and reduced mean lengths of primary, secondary and tertiary roots, but stimulated primary and secondary root branching. Both isomerization to the cis isomer and the presence of the plant reduced the concentration of trans-FA in the nutrient solution during the two weeks exposure period. A third experiment was conducted to assess the influence of irradiance on the phytotoxicity of FA. At a light intensity of 489 μmol m-2 s-1, or in the presence of microorganisms, the concentration of FA in the nutrient solution was lowered and the phytotoxic effects were reduced.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1004682018888
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    Paper (German National Licenses)
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