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Taxonomic status ofAnabaena azollae: An overview (1988)

Plazinski, J. ; Franche, C. ; Liu, C. -C. ; [et al.]

Springer

Plant and soil 108 (1988), S. 185-190

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ISSN: 1573-5036

Keywords: Anabaena azollae ; Azolla ; Cyanobacteria ; DNA/DNA hybridization ; taxonomy

Source: Springer Online Journal Archives 1860-2000

Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition

Notes: Abstract Despite the long-standing and widespread use of the symbiotic association between the aquatic fern Azolla and its cyanobacterial symbiontAnabaena azollae to augment nitrogen supplies in rice paddy soils, very little is known about taxonomic aspects of the symbiosis. The two partners normally remain associated throughout vegetative and reproductive development, limiting the opportunities for interchanges. We have used monoclonal antibodies and DNA/DNA hybridization techniques to show that the cyanobacterial partner is not uniform throughout the genus Azolla, and that substantial diversification has occurred. With these procedures it will be possible to characterize genotypes of the cyanobacterium and to monitor experiments aimed at synthesizing new combinations ofAzolla species andAnabaena azollae strains.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF02370114

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Expression of the 2,4-D degrading plasmid pJP4 of Alcaligenes eutrophus in Rhizobium trifolii (1994)

Feng, L. ; Van Zwieten, L. ; Kennedy, I. R. ; [et al.]

Berlin : Wiley-Blackwell

Acta Biotechnologica 14 (1994), S. 119-129

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ISSN: 0138-4988

Keywords: Life Sciences ; Life Sciences (general)

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Process Engineering, Biotechnology, Nutrition Technology

Notes: The 2,4-dichlorophenoxy acetic acid (2,4-D) degrading plasmid, pJP4, was transferred into Rhizobium trifolii ANU843 from its nature host Alcaligenes eutrophus JMP134 by conjugation. The ability to degrade 2,4-D was expressed in the transconjugant ANU843p as shown by a total loss of UV-absorbent compounds and by gas chromatographic analysis. However, the transconjugant was unable to grow on 2,4-D alone. When the transconjugant strain ANU843p was inoculated onto white and subterranean clover plants in laboratory trials, the transconjugant retained the capacity of nodulation, but the nitrogen-fixation activity was diminished, particularly in the case of subterranean clover. The plasmid in the transconjugant was stable in nodules for at least nine weeks after inoculation and could be of value in applications requiring the protection or removal of the 2,4-D involving cometabolism with plant substrates.

Additional Material: 4 Ill.