Fulltext

Phosphorus Acquisition Strategies within Arbuscular Mycorrhizal Fungal Community of a Single Field Site

Jansa, Jan ; Mozafar, Ahmad ; Frossard, Emmanuel

In: Plant and Soil, 2005, vol. 276, no. 1-2, p. 163-176

Aggiungi alla tua lista
    Titre
    • Phosphorus Acquisition Strategies within Arbuscular Mycorrhizal Fungal Community of a Single Field Site
    Auteur
    • Jansa, Jan. Institute of Plant Sciences, Swiss Federal Institute of Technology (ETH) Zürich, Eschikon 33, CH-8315, Lindau, Switzerland
    • Mozafar, Ahmad. Institute of Plant Sciences, Swiss Federal Institute of Technology (ETH) Zürich, Eschikon 33, CH-8315, Lindau, Switzerland
    • Frossard, Emmanuel. Institute of Plant Sciences, Swiss Federal Institute of Technology (ETH) Zürich, Eschikon 33, CH-8315, Lindau, Switzerland
    Type de document
    • Postprint
    Langue
    • Inglese
    Publié dans
    • Plant and Soil, 2005, vol. 276, no. 1-2, p. 163-176. Kluwer Academic Publishers
    Autre version électronique
    Identifiant OAI-PMH
    • oai:doc.rero.ch:319643
    Summary
    Diversity in phosphorus (P) acquisition strategies was assessed among eight isolates of arbuscular mycorrhizal fungi (AMF) belonging to three Glomus species, all obtained from the same field site. Maize (Zea mays L. cv. Corso) was used as a test plant. Compartmented cultivation containers coupled with 33P radioisotope labeling of soil P were employed to estimate (1) the distance from the roots that AMF were able to acquire soil P from, (2) the rate of soil colonization, (3) the efficiency of uptake of soil P by AMF, (4) benefits provided to maize in terms of P acquisition and growth. Glomus mosseae and G. intraradices took up P 10cm from roots, whereas G. claroideum only up to 6cm from the roots. G. mosseae most rapidly colonized the available soil volume and transported significant amounts of P to maize from a distance, but provided no net P uptake benefit to the plants. On the other hand, both G. intraradices and three out of four G. claroideum isolates significantly improved net P uptake by maize. These effects seem to be related to variability between and to a limited extent also within AMF species, in mycelium development, efficiency of hyphal P uptake and effects on plant P acquisition via the root pathway. In spite of absence of maize growth responses to inoculation with any of the AMF isolates, this study indicates remarkable functional diversity in the underground component of the studied field site