Preinfection cell wall formation in roots and developing nodules ofAlnus rubra Bong |
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Authors: | L. A. Sunell A. M. Berry |
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Affiliation: | (1) Department of Environmental Horticulture, University of California, Davis, California;(2) Graduate Studies, University of California, 252 Mrak Hall, 95616 Davis, CA, USA |
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Abstract: | Summary The establishment of actinorhizal root nodules involves penetration of host cell walls and intracellular colonization by the nitrogen-fixing endosymbiont,Frankia (Actinomycetales). In the early stages of the infection process inAlnus, unusual cell walls with undulate profiles were observed in root tip meristematic derivatives, and in early (preinfection) derivatives of the nodule lobe meristem, inFrankia-inoculated plants. The irregular cell walls attached obliquely to preexisting walls, but were not discontinuous. Serial sections revealed that the unusual walls divided two daughter cells. Microtubules in bundled arrays were abundant near the undulate walls, and radiated in several planes. In the root tips, the anomalous cell walls were observed within one day of inoculation withFrankia. |
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Keywords: | Actinorhizal Root nodule Frankia Alnus Infection process Cell wall Symbiosis |
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