Vertical Distribution of Mycorrhizal Colonization, Root Hairs, and Belowground Biomass in Three Contrasting Sites from the Tropical High Mountains, Merida, Venezuela

Barnola, Luis G.; Montilla, Miguel

doi:10.2307/1552047

Cited by 19 publications

(4 citation statements)

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“…A number of studies have examined the presence of mycorrhizae in the genus Ranunculus (Mullen and Schmidt, 1993;Read and Haselwandter, 1981;Vare et al, 1992Vare et al, , 1997, but none of these studies examined the functional role of these fungi in the nitrogen nutrition of Ranunculus spp. In addition, there have been very few previous studies relating the development of root systems to functioning of alpine plants (Barnola and Montilla, 1997;Mullen and Schmidt, 1993). In the present study, maximal N accumulation in the field occurred at a time when almost no new roots were observed on R. adoneus plants.…”

Section: Discussionmentioning

confidence: 39%

Nitrogen Uptake during Snowmelt by the Snow Buttercup, Ranunculus adoneus

Mullen¹,

Schmidt²,

Jaeger³

1998

Arctic and Alpine Research

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Section: Discussionmentioning

confidence: 39%

Nitrogen Uptake during Snowmelt by the Snow Buttercup, Ranunculus adoneus

Mullen¹,

Schmidt²,

Jaeger³

1998

Arctic and Alpine Research

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“…Olpidium spp. are a relatively harmless root pathogens (Agrios 2005;Webster and Weber 2007) but responsible for the transmission of several viruses (Fauquet et al 2005). Due to the dramatic increase of C. quinoa cultivated areas in the southern part of the Bolivian Altiplano (Vassas et al 2008), further knowledge on the seasonal and spatial dynamics of Olpidium is needed.…”

Section: Discussionmentioning

confidence: 99%

Fungal root symbionts and their relationship with fine root proportion in native plants from the Bolivian Andean highlands above 3,700 m elevation

2010

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Here, we examined the colonization by fungal root symbionts in the cultivated Andean grain Chenopodium quinoa and in 12 species that dominate plant communities in the Bolivian Altiplano above 3,700 m elevation and explore for the possible relationships between fungal colonization and fine root proportion. The 12 most abundant species in the study area were consistently colonized by AMF and DSE. In contrast, the annual Andean grain C. quinoa showed negligible or absence of mycorrhizal fungi colonizing roots. On the other hand, C. quinoa, Junelia seriphioides and Chersodoma jodopappa were infected to a varying degree by the root pathogen Olpidium sp. We observed no relationship between AMF and DSE colonization and proportion of fine roots in the root system, but instead, the ratio between DSE and AMF colonization (ratio DSE/AMF) negatively related with proportion of fine roots. Our findings support the hypothesis regarding the importance of DSE at high altitudes and suggest a functional relationship between the rate of DSE/AMF and proportion of fine roots. The colonization by the root pathogen Olpidium sp. in C. quinoa deserves further study since this Andean grain is increasingly important for the local economy in these marginal areas.

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“…The second objective of the study is to evaluate the association between plant species assemblages and soils that differ in age and physicochemical properties. Whereas some studies have shown close relationships between particular plant communities and stage of soil development (e.g., Smith et al, 1985;Masuzawa, 1985; Barnola and Montilla, 1997;De Koval et al, 2000), others have not (e.g., Mahaney and Spence, 1984). This study evaluates the use of plant communities as indicators of soil profile age and physical and chemical characteristics in the northern South American Andes.…”

Section: Introductionmentioning

confidence: 99%