Lupinus angustifolius rhizobia differ in abundance, diversity and symbiotic performance compared with subterranean clover rhizobia in the same field environment

Krystyna Haq

    Research output: ThesisDoctoral Thesis

    26 Downloads (Pure)

    Abstract

    [Truncated] The symbioses between both Rhizobium leguminosarum bv. trifolii and Trifolium subterraneum L. (subterranean clover) and Bradyrhizobium sp. (Lupinus) and Lupinus angustifolius L. have been integral to agricultural production in Australia's Mediterranean climate regions. The symbiosis between B. sp. (Lupinus) and L. angustifolius has been associated with higher and more consistent levels of N2 fixation than the symbiosis between R. l. bv. trifolii and subterranean clover in south-western Australia over a prolonged period. This has occurred under conditions that include interruption of the symbiosis by rotational practices and summer drought and infrequent reinoculation with elite strains of root nodule bacteria.This study sought to explain differences in symbiotic performance between R. l. bv. trifolii and B. sp. (Lupinus), in terms of the persistence of their populations under selection pressures encountered in the presence or absence of their legume host. Persistence was defined in relation to abundance in soil and consequent nodulation of the host legume and the genetic profile and N2 fixing effectiveness of isolates recovered from nodules.
    Original languageEnglish
    QualificationDoctor of Philosophy
    Awarding Institution
    • The University of Western Australia
    DOIs
    Publication statusUnpublished - 2002

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    • This thesis has been made available in the UWA Profiles and Research Repository as part of a UWA Library project to digitise and make available theses completed before 2003. If you are the author of this thesis and would like it removed from the UWA Profiles and Research Repository, please contact [email protected]

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