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Nodulation in the endemic Australian Papilionoideae tribes Mirbelieae and Bossiaeeae

Andrews, M., Ardley, J.K., Liu, W.Y.Y., James, T.K., Ridgeway, H.J., James, E.K. and Sprent, J.I. (2014) Nodulation in the endemic Australian Papilionoideae tribes Mirbelieae and Bossiaeeae. In: 17th Australian Nitrogen Fixation Conference 2014 Proceedings, 28 September - 2 October, Adelaide, Australia pp. 96-97.

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Brazil and South Africa are centres of diversity of Burkholderia spp. that nodulate legumes (Gyaneschwar et al. 2011; Beukes et al. 2013). The nod gene sequences of Burkholderia spp. capable of nodulating South African plants are clearly separated from those of Burkholderia spp. shown to nodulate South American plants. Where tested, the South African strains did not nodulate South American plants nodulated by Burkholderia spp. (Gyaneschwar et al. 2011).

Dipogon lignosus is an herbaceous legume (tribe Phaseoleae) native to the Fynbos biome of the Cape of South Africa which has become invasive in the Australian-Pacific region (Lewis et al. 2005; Popay et al. 2010). Eight bacterial isolates which produced functional nodules on D. lignosus sampled at two field sites in NZ, were identified as Burkholderia sp. (Liu et al. 2014). Both 16S rRNA and recA gene sequences placed the eight Burkholderia isolates separate from previously described Burkholderia rhizobial species. Burkholderia isolates obtained from D. lignosus sampled in southwest Australia had identical 16S rRNA sequences (930 bp) to the New Zealand D. lignosus strain ICMP 19430. Here, we present the nodC gene sequences of the eight NZ isolates and argue that evidence is strong that these Burkholderia isolates originated in South Africa and were somehow transported with the plants from their native habitat to NZ and Australia.

Item Type: Conference Paper
Murdoch Affiliation(s): Centre for Rhizobium Studies
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