| Autor: |
Pozzi, Adrien C., Bautista ‐ Guerrero, Hector H., Nouioui, Imen, Cotin ‐ Galvan, Laëtitia, Pepin, Régis, Fournier, Pascale, Menu, Frédéric, Fernandez, Maria P., Herrera ‐ Belaroussi, Aude |
| Předmět: |
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| Zdroj: |
Environmental Microbiology; Sep2015, Vol. 17 Issue 9, p3125-3138, 14p |
| Abstrakt: |
Two major types of F rankia strains are usually recognized, based on the ability to sporulate in-planta: spore-positive ( Sp+) and spore-negative ( Sp−). We carried out a study of Sp+ and Sp− Frankia strains based on nodules collected on A lnus glutinosa, A lnus incana and A lnus viridis. The nodules were phenotyped using improved histology methods, and endophytic F rankia strain genotype was determined using a multilocus sequence analysis approach. An additional sampling was done to assess the relation between Sp+ phenotype frequency and genetic diversity of Frankia strains at the alder stand scale. Our results revealed that (i) Sp+ and Sp− Alnus-infective Frankia strains are genetically different even when sampled from the same alder stand and the same host-plant species; (ii) there are at least two distinct phylogenetic lineages of Sp+ F rankia that cluster according to the host-plant species and without regard of geographic distance and (iii) genetic diversity of Sp+ strains is very low at the alder stand scale compared with Sp− strains. Difference in evolutionary history and genetic diversity between Sp+ and Sp− Frankia allows us to discuss the possible ecological role of in-planta sporulation. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
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