xylem of rice (Oryza sativa) is colonized by Azorhizobium caulinodans

Following inoculation with Azorhizobium caulinodans ORS571(pXLGD4), lateral root development of rice and colonization of lateral root cracks by bacteria were shown to be stimulated by the flavonoid naringenin. Rice seedlings growing aseptically in the presence of naringenin were inoculated with ORS5...

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Bibliographic Details
Published in:Proceedings of the Royal Society. B, Biological sciences Biological sciences, 2000-01, Vol.267 (1439), p.103-107
Main Authors: Gopalaswamy, G, Kannaiyan, S, O'Callaghan, K.J, Davey, M.R, Cocking, E.C
Format: Article
Language:English
Subjects:
Azorhizobium caulinodans
Azorhizobium caulinodans - genetics
Azorhizobium caulinodans - physiology
Azospirillum brasilense
Bacteria
Bacterial colonization
colonization
Colony Count, Microbial
Crack Entry
Flavanones
Flavonoids - pharmacology
Inoculation
Lac Operon
Lateral Roots
Microbial colonization
Microscopy, Electron
Naringenin
nitrogen fixation
Oryza - drug effects
Oryza - microbiology
Oryza sativa
Plant roots
Plant Roots - drug effects
Plant Roots - microbiology
Plants
Rhizobiaceae
Rice
roots
Xylem
Xylem Colonization
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Summary:Following inoculation with Azorhizobium caulinodans ORS571(pXLGD4), lateral root development of rice and colonization of lateral root cracks by bacteria were shown to be stimulated by the flavonoid naringenin. Rice seedlings growing aseptically in the presence of naringenin were inoculated with ORS571(pXLGD4), carrying the lacZ reporter gene. By microscopic analysis of sections of inoculated rice roots, it has been demonstrated that the xylem of rice roots can be colonized by Azorhizobium caulinodans. We discuss whether this colonization of the xylem of rice roots by azorhizobia could provide a suitable niche for endophytic nitrogen fixation.
ISSN:0962-8452
1471-2954
DOI:10.1098/rspb.2000.0973