Lanin Research Articles

De “Barracas al fondo” al barrio auténtico: un análisis de dos casos de patrimonialización al sur de la ciudad de Buenos Aires, Argentina

<p>Este artículo analiza la patrimonialización de un sector al oeste del barrio sureño de Barracas (Buenos Aires, Argentina), alejado de las zonas más comerciales y céntricas, a partir de dos casos geográficamente próximos: el Pasaje Lanín y el café y <em>bodegón</em> La Flor de Barracas. El propósito es mostrar cómo los actores implicados en estos dos casos traducen mediante estrategias heterogéneas aspectos del pasado y del presente barriales al discurso del patrimonio, en el cual la autenticidad y la identidad locales aparecen como valores centrales. El cambio de imagen del área a través del patrimonio se articula con una recualificación urbana más amplia. Se analizan entrevistas, material hemerográfico, sitios de internet y redes sociales de los actores implicados y otros documentos relevantes, producidos desde 1998.</p>

Arbuscular mycorrhizal infection in two morphological root types of Araucaria araucana (Molina) K. Koch.

Araucaria araucana (Molina) K. Koch is a conifer distributed in the Andean-Patagonian forests in the south of Argentina and Chile. The main objective of this work was to relate the different root classes appearing in A. araucana to mycorrhizal behavior. Samples were collected in three different sites in the Lanín National Park (NW Patagonia, Argentina). Two different root classes were present in A. araucana: longitudinal fine roots (LFR) and globular short roots (GSR). Both had extensive mycorrhizal arbuscular symbiosis (AM) and presented abundant hyphae and coils in root cells, a characteristic of the anatomical Paris-type. Dark septate fungal endophytes were also observed. Values of total AM colonization were high, with similar partial AM% values for each root class. Seasonal differences were found for total and partial colonization, with higher values in spring compared to autumn. Regarding the percentage of fungal structures between root classes, values were similar for vesicles and arbuscules, but higher coil percentages were observed in GSR compared to LFR. The percentages of vesicles increased in autumn, whereas the arbuscule percentages increased in spring, coinciding with the plant growth peak. Results show that both root classes of A. araucana in Andean-Patagonian forests are associated with AM fungi, which may have ecological relevance in terms of the importance of this symbiosis, in response to soil nutrient-deficiencies, especially high P-retention.