Artículo
Effect of Pinus ponderosa afforestation on soilborne Frankia and saprophytic Actinobacteria in Northwest Patagonia, Argentina
Fecha de publicación:
15/10/2018
Editorial:
Springer
Revista:
Symbiosis
ISSN:
0334-5114
e-ISSN:
1878-7665
Idioma:
Inglés
Tipo de recurso:
Artículo publicado
Clasificación temática:
Resumen
Large areas in the extra-Andean region in the forest - steppe ecotone in “Northwestern Argentinean Patagonia” have been replaced by plantations of the exotic conifer Pinus ponderosa which modify soils physical and chemical factors and alter the biodiversity. Considering that in the region occur saprophytic soilborne actinobacteria that play important role as the fixation of atmospheric nitrogen (N2) in symbiosis with native plant species and the production of bioactive molecules in plants rhizosphere, we aimed to study the effect of the plantation on the abundance of the N2 fixer Frankia and on the genus diversity of cultivable rhizospheric actinobacteria. The study was performed with soils of six paired sites with pine plantations and natural neighbor areas (including steppes or shrublands). Abundance of infective Frankia was estimated by evaluating the nodulation capacity of soils, through a plant bioassay using Ochetophila trinervis as trap plant. Isolation trials for saprophytic actinobacteria were performed by applying chemotactic and successive soils dilutions methods. We concluded that P. ponderosa afforestation affect soil actinobacteria. This was mainly evidenced by a decrease in the Frankia nodulation capacity in O. trinervis, which was related to plantation age, to lower soil carbon and nitrogen content, higher available phosphorus, and to a slight decrease in soils pH. Pine plantation influence on the cultivable saprophytic actinobacteria was less clear. The study highlights the importance of soils as source of Frankia and rhizospheric actinobacteria in relation to disturbance caused by pine plantation in natural environments with native actinorhizal plant species.
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Colecciones
Articulos(INIBIOMA)
Articulos de INST. DE INVEST.EN BIODIVERSIDAD Y MEDIOAMBIENTE
Articulos de INST. DE INVEST.EN BIODIVERSIDAD Y MEDIOAMBIENTE
Articulos(IPATEC)
Articulos de INSTITUTO ANDINO PATAGONICO DE TECNOLOGIAS BIOLOGICAS Y GEOAMBIENTALES
Articulos de INSTITUTO ANDINO PATAGONICO DE TECNOLOGIAS BIOLOGICAS Y GEOAMBIENTALES
Citación
Arancibia, Natalia B.; Solans, Mariana; Mestre, María Cecilia; Chaia, Eugenia Esther; Effect of Pinus ponderosa afforestation on soilborne Frankia and saprophytic Actinobacteria in Northwest Patagonia, Argentina; Springer; Symbiosis; 76; 2; 15-10-2018; 129-137
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