Giraud Eric, Hannibal Laure, Fardoux Joël, Verméglio A., Dreyfus Bernard. (2000). Effect of Bradyrhizobium photosynthesis on stem nodulation of Aeschynomene sensitiva. Proceedings of the National Academy of Sciences, 97 (26), p. 14795-14800. ISSN 0027-8424.
Titre du document
Effect of Bradyrhizobium photosynthesis on stem nodulation of Aeschynomene sensitiva
Année de publication
2000
Type de document
Article
Auteurs
Giraud Eric, Hannibal Laure, Fardoux Joël, Verméglio A., Dreyfus Bernard
Source
Proceedings of the National Academy of Sciences, 2000,
97 (26), p. 14795-14800 ISSN 0027-8424
Some leguminous species of the genus Aeschynomene are specifically stem-nodulated by photosynthetic bradyrhizobia. To study the effect of bacterial photosynthesis during symbiosis, we generated a photosynthesis-negative mutant of the Bradyrhizobium sp. strain ORS278 symbiont of Aeschynomene sensitiva. The presence of a functional photosynthetic unit in bacterioids and the high expression of the photosynthetic genes observed in stem nodules demonstrate that the bacteria are photosynthetically active during stem symbiosis. Stem inoculation by the photosynthetic mutant gave a 50% decrease in stem-nodule number, which reduced nitrogen fixation activity and plant growth in the same proportion. These results indicate an important role of bacterial photosynthesis in the efficiency of stem nodulation. (Résumé d'auteur)
