Phosphorus efficient pastures: variation in mycorrhizal colonisation of subterranean clover

Megan Ryan, Daniel Kidd, Z. Yang, R. Culvenor, A. Stefanski, G. Sandral, Hans Lambers, R. Haling, R. Simpson

    Research output: Chapter in Book/Conference paperConference paper

    Abstract

    Trifolium subterraneum (subterranean clover) is an important annual pasture legume in southern Australia. Development of more phosphorus (P)-efficient cultivars could improve the P balance of pastures. Subterranean clover hosts arbuscular mycorrhizal fungi (AMF). In glasshouse studies, AMF can enhance P uptake by subterranean clover. To examine whether subterranean clover cultivars differ in their levels of colonisation by AMF, a core collection of subterranean clover (97 lines, representing ~80% of genetic diversity in the species), and 42 cultivars were grown in a glasshouse in a low-P sandy soil with indigenous AMF. The soil was free of root diseases. The percentage of root length colonised by AMF, specific root length, average root diameter, shoot P concentration and shoot dry mass were measured. Variation in colonisation within the core and among the cultivars was similar, ~12-68% of root length. However, 41% of the core lines had > 40% of root length colonised compared with 24% of the cultivars. There was a positive linear correlation between colonisation level and shoot P concentration (r2=0.36, P<0.0001), but not shoot dry mass. Relationships between colonisation level and specific root length or average root diameter were weak. We conclude that potential may exist to develop subterranean clover lines with higher or lower colonisation by AMF. However, the benefits of doing so must first be established under field conditions.
    Original languageEnglish
    Title of host publicationBuilding Productive, Diverse and Sustainable Landscapes
    Subtitle of host publicationProceedings of the 17th Australian Agronomy
    Place of PublicationAustralia
    PublisherAustralian Society of Agronomy Inc.
    Pages1 - 4
    Number of pages4
    Volume2015
    ISBN (Print)9780646952246
    Publication statusPublished - 2015
    Event17th Australian Agronomy Conference - Australia
    Duration: 20 Sep 201524 Sep 2015

    Conference

    Conference17th Australian Agronomy Conference
    Period20/09/1524/09/15

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    Ryan, M., Kidd, D., Yang, Z., Culvenor, R., Stefanski, A., Sandral, G., ... Simpson, R. (2015). Phosphorus efficient pastures: variation in mycorrhizal colonisation of subterranean clover. In Building Productive, Diverse and Sustainable Landscapes: Proceedings of the 17th Australian Agronomy (Vol. 2015, pp. 1 - 4). Australia: Australian Society of Agronomy Inc..