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  • Acacia raddiana  (1)
  • Voandzeia subterranea  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Nitrogen fixation in Faidherbia albida, Acacia raddiana, Acacia senegal and Acacia seyal estimated using the 15N isotope dilution technique (1995)
    Springer
    Plant and soil 172 (1995), S. 175-180 
    Details
    ISSN: 1573-5036
    Keywords: Acacia raddiana ; Acacia senegal ; Acacia seyal ; Faidherbia albida ; isotope dilution ; 15N ; nitrogen fixation ; Parkia biglobosa reference tree ; Tamarindus indica
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract A pot experiment was conducted in a greenhouse using the 15N isotope dilution method and two reference plants, Parkia biglobosa and Tamarindus indica to estimate nitrogen fixed in four Acacia species: A raddiana, A. senegal, A. seyal and Faidherbia albida (synonym Acacia albida). For the reference plants, the 15N enrichments in leaves, stems and roots were similar. With the fixing plants, leaves and stems had similar 15N enrichments; they were higher than the 15N enrichment of roots. The amounts of nitrogen fixed at 5 months after planting were similar using either reference plant. Estimates of the percentage of N derived from fixation (%Ndfa) for the above ground parts, in contrast to %Ndfa in roots, were similar to those for the whole plant. However, none of the individual plant parts estimated accurately total N fixed in the whole plant, and excluding the roots resulted in at least 30% underestimation of the amounts of N fixed. Between species, differences in N2 fixation were observed, both for %Ndfa and total N fixed. For %Ndfa, the best were A. seyal (average, 63%) and A. raddiana (average, 62%), being at least twice the %Ndfa in A. senegal and F. albida. Because of its very high N content, A. seyal was clearly the best in total N fixed, fixing 1.62 g N plant−1 compared to an average of 0.48 g N plant−1 for the other Acacia species. Our results show the wide variability existing between Acacia species in terms of both %Ndfa and total N fixed: A. seyal was classified as having a high N2 fixing potential (NFP) while the other Acacia species had a low NFP.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00011319
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  • 2
    Electronic Resource
    Electronic Resource
    The development and structure of root nodules on bambara groundnut [Voandzeia (Vigna)subterranea] (1997)
    Springer
    World journal of microbiology and biotechnology 14 (1997), S. 177-184 
    Details
    ISSN: 1573-0972
    Keywords: Bradyrhizobium ; determinate ; indeterminate ; infection thread ; nodule ; Voandzeia subterranea
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Abstract The infection of Vigna subterranea (formerly Voandzeia subterranea) by Bradyrhizobium strain MAO 113 (isolated from V. subterranea) was examined by light and transmission electron microscopy. Bacteria accumulated on the epidermis close to root hairs, and subsequently entered the latter via infection threads. Most of the steps involved in nodule formation were generally characteristic of determinate nodules, such as those which form on the closely related V. radiata. For example, nodule meristems were induced beneath the root epidermis adjacent to infected root hairs, but prior to infection of the meristem by rhizobia. Moreover, after the infection of some of the meristematic cells by the infection threads, and the release of the rhizobia into membrane-bound vesicles, the infection process ceased and dissemination of the rhizobia was by division of already-infected host cells. However, there were some aspects of this process in V. subterranea which have been more commonly described in indeterminate nodules. These include long infection threads entering a number of cells within the meristems simultaneously and a matrix within infection threads which was strongly labelled with immunogold monoclonal antibodies, MAC236 and MAC265, which recognize epitopes on an intercellular glycoprotein. The MAC236 and MAC265 antibodies also recognized material in the unwalled infection droplets surrounding bacteria which were newly-released from the infection threads. The amount of labelling shown was more characteristic of the long infection threads seen in indeterminate nodules such as pea (Pisum sativum) and Neptunia plena. The structure of mature V. subterranea nodules was similar to that described for other determinate nodules such as Glycine max, Vigna unguiculata and V.radiata, i.e. they were spherical and the infected zone consisted of both infected and uninfected cells. Surrounding the infected tissue was an inner cortex of uninfected cell layers containing the putative components of an oxygen diffusion barrier (including glycoprotein-occluded intercellular spaces), and an outer cortex with cells containing calcium oxalate crystals.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1008869710607
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