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  • Lupinus  (1)
  • oxygen  (1)
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  • 1
    Electronic Resource
    Electronic Resource
    Physiological responses of lupin roots to high pH (1993)
    Springer
    Plant and soil 155-156 (1993), S. 509-512 
    Details
    ISSN: 1573-5036
    Keywords: Lupinus ; root elongation ; cell growth ; high pH
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract High pH seems to be a major constraint limiting the production of narrow-leafed lupin (Lupinus angustifolius L.) on alkaline soils. Whereas there has been much interest in soil acidity, relatively little is known about the effect of high pH on the growth of roots of higher plants. Elongation of roots of L. angustifolius was particularly sensitive to pH≥6.0 compared with other species. The effect of high pH in decreasing root elongation in L. angustifolius occurred within one hour. It was via an effect on cell elongation and not cell division and the effect was readily reversible. The mechanisms of the adverse effect of high pH are unknown. The permeability ratio of K+ to Na+ in the plasma-membrane of the root cortical cells was similar in solutions of both low pH and high pH. Reduced cell growth at high pH was not associated with an inefficiency of proton extrusion to the bulk solution by roots of this species. Nevertheless, increasing buffer concentration in the external solution decreased root elongation more in L. angustifolius than in Lupinus pilosus and Pisum sativum.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00025095
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  • 2
    Electronic Resource
    Electronic Resource
    Mineral nutrients in floodwater and floating rice growing at water depths up to two metres (1987)
    Springer
    Plant and soil 104 (1987), S. 147-150 
    Details
    ISSN: 1573-5036
    Keywords: floodwater ; nitrogen ; phosphorus ; potassium ; oxygen ; rice
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Concentrations of N, P and K were measured in floodwater and in floating rice cultivars growing at up to 2m water depths in the central flood plain of Thailand. Concentrations of N, P and K in floodwater were often higher than those reported for oligotrophic lakes, nevertheless the floodwater contained 4–45 times less K and 15–90 times less N than concentrations reported in most soil solutions. P concentrations were similar in the floodwater and in most soil solutions. Concentrations of nutrients in leaves indicated there may be deficiencies of P at two sites and a deficiency of N at one of two sites. Data are discussed in terms of reduced nutrient uptake in rice fields at low O2 concentrations which have recently been measured in these areas.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02370637
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