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  • high pH  (2)
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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
    High pH in the nutrient solution impairs water uptake in Lupinus angustifolius L. (1993)
    Springer
    Plant and soil 155-156 (1993), S. 517-519 
    Details
    ISSN: 1573-5036
    Keywords: water relation ; high pH ; Lupinus angustifolius
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Root growth in Lupinus angustifolius is greatly decreased when the nutrient solution has a pH above 6.0. This study examined the water relations in this species (cv. Yandee) in response to high pH in solution culture in a glasshouse. The dry weight of roots, the length of taproots and lateral roots and the number of lateral roots were significantly reduced at day 12 after transfer to solution with a pH of 7.5 compared to pH 5.2. This resulted in a marked reduction of total root surface area. However, shoot growth and total leaf area were not affected. In comparison with pH 5.2, plants grown at pH 7.5 in the nutrient solution had a 14–38% more-negative leaf water potential, and their stomatal resistance had increased by 67%. The observations indicate that the impairment of the water relations by high pH is mainly caused by decreased root growth.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00025097
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    Paper (German National Licenses)
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