Arbuscular mycorrhizal fungi populations in relationship with soil properties and host plant in grasslands of Tierra del Fuego
Sheep overgrazing in grasslands of Tierra del Fuego has determined a decrease of grass cover but an increase in a prostrate shrub of low forage value (murtilla, Empetrum rubrum). We selected soils with different modality of grazing, which deter- mined particular characteristics in soil and vegetation. Abundance and diversity of spores of arbuscular mycorrhizal fungi were studied on the four soils and on three of the most frequent grasses (Festuca gracillima, Deschampsia flexuosa y Poa rigidifolia). Spore counts were measured in rizospheric soil, along with nutrient content (P and N) in plants, and percentage of root length colonised and the morphology of colonisation. The most frequent species was Glomus fasciculatum. The soil, the host plant, and the interaction between both variables influenced total spore counts and percentage of root length colonised. Poa rigidifolia showed the highest number of rizospheric spores and the highest percentage of root length colonised. Neither relationship between spore counts and root colonisation nor relationship between root colonisation and P or N plant con- tents were observed using the whole data (soils and plants). Total spore counts were correlated positively with measures of N, P, Ca, K and pH in soil. Nevertheless, when soils and plants were studied separately, both the relationship between spore counts and percent of root colonised and its direction depended on the soil-host combination.
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Asociación Argentina de Ecología
2002
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Mendoza, Rodolfo E. Goldmann, Valeria Rivas, Juan Escudero, Viviana Pagani, Eduardo Collantes, Marta Marbán, Liliana |
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Mendoza, Rodolfo E. Goldmann, Valeria Rivas, Juan Escudero, Viviana Pagani, Eduardo Collantes, Marta Marbán, Liliana Arbuscular mycorrhizal fungi populations in relationship with soil properties and host plant in grasslands of Tierra del Fuego |
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Mendoza, Rodolfo E. Goldmann, Valeria Rivas, Juan Escudero, Viviana Pagani, Eduardo Collantes, Marta Marbán, Liliana |
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Mendoza, Rodolfo E. |
| title |
Arbuscular mycorrhizal fungi populations in relationship with soil properties and host plant in grasslands of Tierra del Fuego |
| title_short |
Arbuscular mycorrhizal fungi populations in relationship with soil properties and host plant in grasslands of Tierra del Fuego |
| title_full |
Arbuscular mycorrhizal fungi populations in relationship with soil properties and host plant in grasslands of Tierra del Fuego |
| title_fullStr |
Arbuscular mycorrhizal fungi populations in relationship with soil properties and host plant in grasslands of Tierra del Fuego |
| title_full_unstemmed |
Arbuscular mycorrhizal fungi populations in relationship with soil properties and host plant in grasslands of Tierra del Fuego |
| title_sort |
arbuscular mycorrhizal fungi populations in relationship with soil properties and host plant in grasslands of tierra del fuego |
| description |
Sheep overgrazing in grasslands of Tierra del Fuego has determined a decrease of grass cover but an increase in a prostrate shrub of low forage value (murtilla, Empetrum rubrum). We selected soils with different modality of grazing, which deter- mined particular characteristics in soil and vegetation. Abundance and diversity of spores of arbuscular mycorrhizal fungi were studied on the four soils and on three of the most frequent grasses (Festuca gracillima, Deschampsia flexuosa y Poa rigidifolia). Spore counts were measured in rizospheric soil, along with nutrient content (P and N) in plants, and percentage of root length colonised and the morphology of colonisation. The most frequent species was Glomus fasciculatum. The soil, the host plant, and the interaction between both variables influenced total spore counts and percentage of root length colonised. Poa rigidifolia showed the highest number of rizospheric spores and the highest percentage of root length colonised. Neither relationship between spore counts and root colonisation nor relationship between root colonisation and P or N plant con- tents were observed using the whole data (soils and plants). Total spore counts were correlated positively with measures of N, P, Ca, K and pH in soil. Nevertheless, when soils and plants were studied separately, both the relationship between spore counts and percent of root colonised and its direction depended on the soil-host combination. |
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Asociación Argentina de Ecología |
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2002 |
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https://ojs.ecologiaaustral.com.ar/index.php/Ecologia_Austral/article/view/1549 |
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rev-ecoaus-article-15492021-01-11T02:57:56Z Arbuscular mycorrhizal fungi populations in relationship with soil properties and host plant in grasslands of Tierra del Fuego Poblaciones de hongos micorrízicos arbusculares en relación con las propiedades del suelo y de la planta hospedante en pastizales de Tierra del Fuego Mendoza, Rodolfo E. Goldmann, Valeria Rivas, Juan Escudero, Viviana Pagani, Eduardo Collantes, Marta Marbán, Liliana grassland arbuscular micorrhyzal fungi spores colonized root host plants soil properties grazing pastizales micorrizas arbusculares esporas colonización de raíz planta hospedante propiedades del suelo pastoreo Sheep overgrazing in grasslands of Tierra del Fuego has determined a decrease of grass cover but an increase in a prostrate shrub of low forage value (murtilla, Empetrum rubrum). We selected soils with different modality of grazing, which deter- mined particular characteristics in soil and vegetation. Abundance and diversity of spores of arbuscular mycorrhizal fungi were studied on the four soils and on three of the most frequent grasses (Festuca gracillima, Deschampsia flexuosa y Poa rigidifolia). Spore counts were measured in rizospheric soil, along with nutrient content (P and N) in plants, and percentage of root length colonised and the morphology of colonisation. The most frequent species was Glomus fasciculatum. The soil, the host plant, and the interaction between both variables influenced total spore counts and percentage of root length colonised. Poa rigidifolia showed the highest number of rizospheric spores and the highest percentage of root length colonised. Neither relationship between spore counts and root colonisation nor relationship between root colonisation and P or N plant con- tents were observed using the whole data (soils and plants). Total spore counts were correlated positively with measures of N, P, Ca, K and pH in soil. Nevertheless, when soils and plants were studied separately, both the relationship between spore counts and percent of root colonised and its direction depended on the soil-host combination. El sobrepastoreo ovino en pastizales de suelos ácidos de Tierra del Fuego ha determinado una disminución de la cobertura de gramÌneas de interés forrajero y un aumento de la cobertura de un arbusto postrado poco apetecible (murtilla, Empetrum rubrum). Se seleccionaron suelos sometidos a distinta modalidad de pastoreo que tenían características y vegetación particulares. Se midió la cantidad total y la diversidad de esporas de hongos micorrízicos arbusculares en los cuatro suelos y en la rizósfera de tres de las gramíneas más frecuentes (Festuca gracillima, Deschampsia flexuosa y Poa rigidifolia) en los pastizales de la estepa fueguina. En el suelo rizosférico se determinó la cantidad y la diversidad de esporas de hongos micorrízicos arbusculares, y en las plantas el contenido de P, N y el porcentaje y morfologÌa de la colonización micorrízica en raíces. Se identificaron las esporas de las tres especies de hongos micorrízicos arbusculares más abundantes. Glomus fasciculatum fue la especie de mayor frecuencia. La cantidad total de esporas y la colonización en raíz dependieron del suelo, de la especie hospedante y de la interacción entre ambas variables. Poa rigidifolia presentó el mayor n ̇mero total de esporas en su rizósfera y la mayor colonización en raÌz. Para todos los suelos y plantas estudiadas no hubo relación entre la cantidad total de esporas y el porcentaje colonizado de la raíz, ni tampoco entre este porcentaje y las concentraciones de N y P en planta. La cantidad total de esporas se correlacionó positivamente con las medidas de N, P, Ca, K y pH del suelo. Sin embargo, al analizar el suelo y las planta de manera separada, tanto la existencia de relación entre la cantidad de esporas y el porcentaje colonizado como la dirección y el sentido de la misma dependieron de la combinación suelo-hospedante. Asociación Argentina de Ecología 2002-12-01 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artículos application/pdf https://ojs.ecologiaaustral.com.ar/index.php/Ecologia_Austral/article/view/1549 Ecología Austral; Vol. 12 No. 2 (2002); 105-116 Ecología Austral; Vol. 12 Núm. 2 (2002); 105-116 0327-5477 1667-7838 spa https://ojs.ecologiaaustral.com.ar/index.php/Ecologia_Austral/article/view/1549/883 Derechos de autor 2021 Ecología Austral |