S. Fontenla

The mycorrhizal status of plant species in north-west Patagonia was examined. Communities represe... more The mycorrhizal status of plant species in north-west Patagonia was examined. Communities representative of Patagonian steppe and marshes were compared with respect to the mycorrhizal status of their species. Most of both native and exotic plant species sampled were arbuscular mycorrhizal (AM). The percentage of species with mycorrhizal association was higher for perennial herbs and shrubs than for annual herbs. The higher ratio of mycorrhizal/nonmycorrhizal (NM) species found for dicotyledons than for monocotyledons, could reflect the presence of a considerable number of NM monocotyledons in the marsh. The mycorrhizal status of plants differed slightly between the steppe and the marsh. In the steppe, native AM species were more frequent than in the marsh. In contrast, in the marsh, the NM species were proportionally more represented than in the steppe. The Juncaceae and Cyperaceae, which include hydrohytic NM plants, accounted for many of these differences. Moreover, the dominant s...

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Micorrizas y levaduras asociadas a Nothofagus nervosa [Raulí] en poblaciones naturales y en plantas cultivadas en vivero. Resumen

by S. Fontenla and P. Marchelli

Fungal endophyte β-diversity associated with Myrtaceae species in an Andean Patagonian forest (Argentina) and an Atlantic forest (Brazil)

Myrtaceae a b s t r a c t

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Comparación de condiciones de cultivo para el aislamiento y recuento simultaneo de levaduras de suelos de bosques nativos de Nothofagus spp.(Fagaceae) de la Patagonia Argentina

by S. Fontenla and M. Mestre

Negative influence of non-host plants on the colonization of Pisum sativum by the arbuscular mycorrhizal fungus Glomus mosseae

Soil Biology and Biochemistry, 1999

We studied the in¯uence of the arbuscular mycorrhizal (AM) non-host plants Stellaria media (Caryo... more We studied the in¯uence of the arbuscular mycorrhizal (AM) non-host plants Stellaria media (Caryophyllaceae), Chenopodium album and Spinaceae oleracea (Chenopodiaceae), Brassica campestris, B. nigra, Capsella bursa-pastoris and Sisymbrium altissimum (Brassicaceae), Juncus balticus (Juncaceae), Urtica dioica (Urticaceae) and of the AM host plant Taraxacum ocinale (Asteraceae) on the colonization of Pisum sativum by the AM fungus Glomus mosseae. None of the non-host plants tested were colonized by Glomus mosseae. Older non-host plants competed with P. sativum. No inhibition of AM colonization was observed in host plants that were grown in the same pot and at the same time as non-host plants. However, when non-host plants were grown for 30 d before P. sativum, they inhibited mycorrhizal colonization of the latter. In a split pot system the presence of U. dioica on the left-side decreased AM colonization of P. sativum roots on the left-side, but not on the right-side. Non-host plants decreased the inoculum potential of G. mosseae and in some cases the percentage AM colonization of host plants cultivated after non-host plants. These results indicate that roots of non-host species have factors that seem to aect the AM fungus before it establishes in the root of host plants. # Soil Biology and Biochemistry 31 0038-0717/99/$ -see front matter # 1999 Elsevier Science Ltd. All rights reserved. PII: S 0 0 3 8 -0 7 1 7 ( 9 9 ) 0 0 0 8 7 -5

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Root associations in Austrocedrus forests and seasonal dynamics of arbuscular mycorrhizas

Mycorrhiza, 1998

... Trans Br Mycol Soc 84:679684 Giovannetti M, Mosse B (1980) An evaluation of techniques for m... more

Differential hypogeous sporocarp production from Nothofagus dombeyi and N. pumilio forests in southern Argentina

Mycologia, 2012

Mycorrhizal fungi that form hypogeous sporocarps are an important component of the temperate fore... more Mycorrhizal fungi that form hypogeous sporocarps are an important component of the temperate forest soil community. In many regions, such as the Nothofagus forest in the Patagonian Andes, this group of fungi has been poorly studied. Here we examined the spring and autumn community composition of ''sequestrate fungi'', based on sporocarp production in pure forests of Nothofagus dombeyi (evergreen) and N. pumilio (deciduous). We investigated the possible relationships between these communities and environmental factors over 2 y. The rarefaction curves and the minimal richness estimates converged at nearly the same level for each forest type, and the asymptotes suggested that the sampling effort was sufficient to capture most of the hypogeous sporocarp richness in these forest stands. In total 27 species were recovered. Basidiomycota, Ascomycota and Glomeromycota respectively accounted for nine, two and one genera. Species richness of hypogeous sporocarps varied in relation to forest type but not to season (fall and spring), whereas sporocarp biomass varied according to an interaction between season and forest type. Species richness and sporocarp biomass were positively correlated with rainfall and negatively correlated with altitude. In addition sporocarp species richness was positively related to number of trees per transect. We found that two different forest stands, each dominated by different species of Nothofagus, exhibited different hypogeous sporocarp communities.

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Spatial pattern of Austrocedrus chilensis wilting and the scope of autocorrelation analysis in natural forests

by S. Fontenla and N. Baccalá

Forest Ecology and Management, 1994

... The up-per tree layer is dominated by Austrocedrus chi-lensis; Nothofagus dombeyi and Lomatia... more

Levaduras fermentadoras aisladas de Cyttaria hariotii (Fungi) en bosques Andino-Patagónicos (Argentina)

Boletín de la Sociedad …, 2009

Page 1. 239 LEVADURAS FERMENTADORAS AISLADAS DE CYTTARIA HARIOTII (FUNGI) EN BOSQUES ANDINO-PATAG... more

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