Effects of aluminium on the peanut (Arachis hypogaea L.)/ Bradyrhizobium symbiosis

Brady, D. J. and Edwards, D. G. and Asher, C. J. (1994) Effects of aluminium on the peanut (Arachis hypogaea L.)/ Bradyrhizobium symbiosis. Plant and Soil, 159 (2). pp. 265-276.

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The effects of low activities of the monomeric Al species, Al3+, Al(OH)2 + and Al(OH)2+, on the peanut/Bradyrhizobium symbiosis were examined in solution culture. In flowing solution culture, growth of the host plant was depressed at activities ≥5 μM. Neither shoot dry weight, root dry weight nor root length were inhibited by 3 μM Al, an activity which reduced nodule number by 70%. Low nodule number was compensated for, at this activity, by an increase in weight per nodule. In non-flowing solution culture of similar composition, survival of a streptomycin resistant mutant of Bradyrhizobium spp. NC92 in the bulk solution or in the rhizosphere of peanut roots was unaffected by 20 μM Al. The site of infection by Bradyrhizobium was examined by scanning electron microscopy. Lateral root axils of plants exposed to ≥2 μM Al did not display the rosette of multicellular root hairs which is characteristic in normal plants. The detrimental effects of Al on nodulation appear to be related to structural changes at the site of infection which are observed at Al activities too low to cause any depression in growth of the host plant, including root length, and at activities of Al which do not affect survival of the free-living Bradyrhizobium.

Item Type: Article
Additional Information: SNNigam Collection
Uncontrolled Keywords: Aluminum toxicity, Aluminium toxicity, Arach& hypogaea L., Bradyrhizobium, Solution culture, Nodulation
Author Affiliation: Department of Agriculture, University of Queensland, Australia
Subjects: Soil Science and Microbiology
Statistics and Experimentation > Experimentation
Crop Improvement > Biotechnology
Divisions: Groundnut
Depositing User: Mr Arbind Seth
Date Deposited: 03 Apr 2013 09:05
Last Modified: 03 Apr 2013 09:05
Official URL: http://dx.doi.org/10.1007/BF00009289
URI: http://eprints.icrisat.ac.in/id/eprint/10084

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