263 research outputs found
Evolutionary divergence in the nifH.D.K. gene region among nine symbiotic Anabaena azollae and between Anabaena azollae and some free-living heterocystous cyanobacteria
Isolation and characterization of non-heterocystous tropical cyanobacteria growing on nitrogen-free medium
Improving smallholder livelihoods through improved casuarina productivity : proceedings of the 4th international casuarina workshop
Improving smallholder livelihoods through improved Casuarina productivity : proceedings of the 4th international casuarina workshop
Transformed Hairy Roots of the actinorhizal shrub Discaria trinervis: a valuable tool for studying actinorhizal symbiosis in the context of intercellular infection
Actinorhizal nitrogen fixing nodules: infection process, molecular biology and genomics
Actinorhizal hosts are non-leguminous perennial plants belonging to 8 angiosperm families. They are capable of forming root nodules as a result of infection by a nitrogen-fixing actinomycete called Frankia. Actinorhizal nodules consist of multiple lobes, each of which represents a modified lateral root with infected cells in the expanded cortex. This article summarizes the most recent knowledge about this original symbiotic process. The infection process is described both at cytological and molecular levels. The use of transgenic Casuarinaceae for studying in actinorhizal nodules the regulation of several symbiotic promoters from legumes is also discussed. With progress in plant genome sequencing, comparative genomics in legumes and actinorhizal plants should contribute to the understanding of the evolutionary history of nitrogen-fixing symbioses.
Key words : Nitrogen-fixation, actinorhizal nodules, Frankia, Casuarina, symbiotic gene.
African Journal of Biotechnology Vol. 2 (12), pp. 528-538, December 200
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