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  • 1
    Electronic Resource
    Electronic Resource
    Physiological integration in the clonal perennial herb Trifolium repens L. (1992)
    Springer
    Oecologia 89 (1992), S. 338-347 
    Details
    ISSN: 1432-1939
    Keywords: Carbon translocation ; Physiological integration ; Defoliation ; Trifolium repens ; Branches
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Translocation of 14C-labelled carbohydrates between the parent stolon and branches, and among branches, of Trifolium repens plants was investigated in two glasshouse experiments to determine patterns of physiological organisation in this clonal species. Differential defoliation treatments were applied to the parent stolon and/or branches to test the sensitivity of translocation to the short-term carbon needs of defoliated sinks. Strong reciprocal exchange of carbohydrate between the parent stolon and branches was observed, with 18 41% of the 14C exported from leaves on the parent stolon moving to branches, while branches simulta-neously exported 25% (for old source branches) to 54% (for young source branches) of the 14C they assimilated to the parent plant, including translocation to other branches. Branch-to-branch translocation occurred both acropetally and basipetally. Parent-to-branch, branch-to-parent and branch-to-branch carbon fluxes all increased in response to defoliation of the sink, at the expense of carbon supply to stolon tissue or roots of the source module. Reduced export to stolon tissue of the parent axis played a major role in facilitating C reallocation from leaves on the parent stolon to defoliated branches. The observed patterns of C allocation and translocation could be adequately explained by accepted source-sink theory, and are consistent with a high degree of intra-plant physiological integration in resource supply and utilisation. This information provides mechanistic explanations for aspects of the growth dynamics and ecological interactions of T. repens in the patchy environment of a grazed pasture.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00317411
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Interactions between nitrate uptake and N2 fixation in white clover (1986)
    Springer
    Plant and soil 91 (1986), S. 401-404 
    Details
    ISSN: 1573-5036
    Keywords: Growth ; 15N ; Nodule ; Trifolium repens L
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary White clover (Trifolium repens L.) plants grown in pots and supplied with the same ‘concentration x days’ of15N labelled nitrate, but in contrasting patterns and doses had similar N concentrations but differed in the proportions devived from N2 fixation and nitrate. N2-fixation and nodule dry weight responded rapidly (2–3 days) to changes in nitrate availability. Plants exposed frequently to small doses of nitrate took up more nitrate (and hence relied less on N2-fixation) and had greater dry weights and shoot: root ratios than those exposed to larger doses less often. In mixed ryegrass (Lolium perenne L.)/clover communities clover's ability to either successfully compete for nitrate or fix N2 gave it consistently higher N concentrations than grass whether they were given high or low nitrate nutrient. This higher N concentration was accompanied by greater dry weights than grass in the low nitrate swards but not where high levels of nitrate were applied.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02198132
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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