Root associations in Austrocedrus forests and seasonal dynamics of arbuscular mycorrhizas

Fontenla, Sonia; Godoy, Roberto; Rosso, Pablo; Havrylenko, Maria

doi:10.1007/s005720050207

Cited by 67 publications

(48 citation statements)

References 15 publications

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“…In the present study, as already found in others [21,27,43,81], species belonging to the same family tended to have the same mycorrhizal behavior. However, several exceptions to this general rule were observed.…”

Section: Discussionsupporting

confidence: 90%

Arbuscular mycorrhizal colonization of vascular plants from the Yungas forests, Argentina

Becerra

Cabello²,

Chiarini

2007

Ann. For. Sci.

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-In Argentina, the Yungas forests are among the ecosystems most affected by human activity, with loss of biodiversity. To assess the mycorrhizal status in these ecosystems, the roots of 41 native plant species belonging to 25 families were collected throughout the year from two sites of the Yungas forests. Roots were washed and stained to study the presence of arbuscular mycorrhizas (AM). Morphological types of arbuscular mycorrhizas (Arum and Paris-type) and colonization patterns were identified and photographed. All plants presented AM colonization. The AM colonization patterns varied from single intracellular aseptate hyphae, coils, appresoria, to vesicles and/or arbuscules. Among the species studied, the Paris-type colonization showed to be dominant. Results confirmed that AM hosts are predominant in the Yungas of South American forests.Yungas / arbuscular mycorrhizal / Arum-type / Paris-type / Alnus forests Résumé -Colonisation par les mycorhizes arbusculaires dans des plantes vasculaires des forêts des Yungas, Argentine. En Argentine, les Yungas constituent un des écosystèmes les plus atteints par l'activité de l'homme, avec la perte de biodiversité qui en découle. Pour évaluer le statut mycorhizien de ces écosystèmes, les racines de 41 plantes autochtones appartenant à 25 familles ont été collectées au cours de l'année dans deux sites des forêts des Yungas. Les racines ont été lavées et teintes afin de déterminer la présence des mycorhizes arbusculaires (MA). Les types morphologiques de MA (type Arum et Paris) et les patrons de colonisation ont été identifiés et photographiés. Toutes les plantes ont présenté une colonisation MA. Les structures fongiques intraracinaires comprenaient des hyphes intracellulaires sans cloison, des boucles, des appressoria, des vésicules et/ou des arbuscules. Le type de colonisation Paris est apparu comme dominant parmi les espèces étudiées. Les résultats confirment que les hôtes avec MA prédominent dans les forêts sudaméricaines des Yungas.Yungas / mycorhizes arbusculaires / type Arum / type Paris / bois d'Alnus

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Section: Discussionsupporting

confidence: 90%

Arbuscular mycorrhizal colonization of vascular plants from the Yungas forests, Argentina

Becerra

Cabello²,

Chiarini

2007

Ann. For. Sci.

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“…Previous reports on seasonal variation of AMF often describe a pattern that is closely linked to plant growth [11,13]. Root infection increases during the active growth season and spore abundance peaks just after plant growth finishes.…”

Section: Introductionmentioning

confidence: 99%

“…Root infection increases during the active growth season and spore abundance peaks just after plant growth finishes. Hence, in locations under temperate climates where plant growth is limited by the low temperatures of winter, root colonisation increases in spring and summer with a decline at the end of the growth season [27,28] and the highest number of spores can be found in autumn and winter [11]. However, under Mediterranean-type climates, plant growth starts in late winter and stops during the hot dry summer, so root infection would be expected to peak in spring and sporulation to occur at the beginning of summer [25].…”

Section: Introductionmentioning

confidence: 99%

Arbuscular mycorrhizal fungi of Ammophila arenaria (L.) Link: Spore abundance and root colonisation in six locations of the European coast

Rodríguez‐Echeverría

Hol

Freitas

et al. 2008

European Journal of Soil Biology

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with time and location. A clear peak of sporulation in autumn was found for three of the northern sites, but no pattern was detected in the southern sites. Root colonisation showed no seasonal pattern, despite differences between sampling times. Both hyphal coils and arbuscules were observed inside the roots, indicating colonisation by more than one AMF species. No correlation was found between root colonisation and spore number, or between AMF abundance and soil fertility. We conclude that: (a) spore production is driven by climatic conditions in the studied northern sites and by plant phenology in the studied southern sites; and that (b) root colonisation is independent of climate, phenology and soil fertility in the studied locations.

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“…Previous reports carried out in steppes, forests, and high-mountain regions of Patagonia had focussed on root colonization and had indicated that most plant species are colonized by AMF (Fontenla et al 1998;Bidartondo et al 2002;Fernández & Fontenla 2010;Nouhra et al 2011). Our study -therefore representing the first assessment of the species of AMF spores in soils of this region that has spanned different environments and altitudes -evidenced a diverse AMF community associated with a variety of plant hosts.…”

Section: Discussionmentioning

confidence: 99%

Occurrence of arbuscular mycorrhizal fungi in high altitude sites of the Patagonian Altoandina region in Nahuel Huapi National Park (Argentina)

et al. 2016

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Knowledge of the occurrence and diversity of arbuscular mycorrhizal fungi (AMF) in National Parks is essential for the establishment of policies for conservation. Th e aim of this study was to characterize the AMF communities in the Patagonian Altoandina region in Nahuel Huapi National Park, Argentina. We surveyed AMF spores associated with the rhizospheres of 9 plant species in the Patagonian Steppe (PS), Challhuaco Hill (ChH), Catedral Hill (CH), and Tronador Hill (TH) regions and detected a total of 27 Glomeromycota species. Acaulospora laevis was dominant at all sites. Th e AMF community was dominated by Acaulosporaceae, as regards the number of species and contribution of each one to the total number of spores. Th ree Glomeromycota families were detected at PS, the site with the lowest elevation; whereas fi ve to six families were detected at ChH, CH, and TH. Cluster analysis indicated that the AMF communities were grouped according to habitat. We concluded that certain patterns of the AMFcommunity structure detected were equivalent to those of high-altitude environments from other studies, while others were unique to the Patagonian region; thus suggesting that historical infl uences like dispersion and speciation played a critical role in shaping AMF community composition in such high-altitude environments.

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Root associations in Austrocedrus forests and seasonal dynamics of arbuscular mycorrhizas

Cited by 67 publications

References 15 publications

Arbuscular mycorrhizal colonization of vascular plants from the Yungas forests, Argentina

Arbuscular mycorrhizal colonization of vascular plants from the Yungas forests, Argentina

Arbuscular mycorrhizal fungi of Ammophila arenaria (L.) Link: Spore abundance and root colonisation in six locations of the European coast

Occurrence of arbuscular mycorrhizal fungi in high altitude sites of the Patagonian Altoandina region in Nahuel Huapi National Park (Argentina)

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