A new species of <i>Neurachne</i> (Poaceae) from Western Australia

Macfarlane, Terry Desmond

doi:10.58828/nuy00522

Cited by 2 publications

(1 citation statement)

References 6 publications

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“…The analysis of the 25 BIF ranges identified 24 taxa as occurring on individual BIF ranges, a further six taxa restricted to BIF but occurring across several ranges, and 14 that had their distributions centred on BIF ranges (Table 2). Of these 44 taxa, 17 are described in this issue (Barrett 2007;Bull 2007;Conn & Shepherd 2007;Hislop & Chapman 2007;Macfarlane 2007;Maslin 2007;Maslin & Buscumb 2007a, 2007bMeissner & Markey 2007;Rye 2007;Shepherd 2007;Shepherd et al 2007), however a further 13 require formal description.…”

Section: Resultsmentioning

confidence: 99%

Taxonomic research and the conservation status of flora in the Yilgarn Banded Iron Formation ranges

Gibson¹,

Coates²,

Thiele³

2007

Nuytsia

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Gibson, N., Coates, D.J. & Thiele, K.R. Taxonomic research and the conservation status of flora in the Yilgarn Banded Iron Formation ranges. Nuytsia 17: 1-12 (2007). The Banded Iron Formation (BIF) ranges are small, ancient ranges scattered across the Yilgarn Craton in southern Western Australia. Increased exploration and mining of iron ore in Western Australia has resulted in a resurgence of botanical survey on and around the BIF ranges, including the discovery of at least 20 unnamed taxa, nine of which were new to science. Recent taxonomic work, published in this special edition of Nuytsia, has concentrated on naming 17 taxa with distributions centred on these ranges and a further 62 taxa of conservation significance in the southern half of Western Australia. Despite this increase in activity, the conservation status of the flora and vegetation remains poorly documented. Patterns in distribution of threatened, rare and poorly known taxa (Declared Rare Flora and Priority Flora) and patterns in endemism are examined on a subset of the 25 ranges most prospective for mining. Preliminary analysis of endemism supports the hypotheses that these ranges represent both refugial habitats of great antiquity and areas of recent speciation. Across Western Australia there are some 2,240 taxa under consideration for formal listing by the Department of Environment and Conservation as threatened; of these, 475 are yet to be formally named. This situation significantly impedes their conservation assessment.

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Section: Resultsmentioning

confidence: 99%

Taxonomic research and the conservation status of flora in the Yilgarn Banded Iron Formation ranges

Gibson¹,

Coates²,

Thiele³

2007

Nuytsia

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Multiple photosynthetic transitions, polyploidy, and lateral gene transfer in the grass subtribe Neurachninae

Christin

Wallace

Clayton

et al. 2012

Journal of Experimental Botany

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The Neurachninae is the only grass lineage known to contain C3, C4, and C3–C4 intermediate species, and as such has been suggested as a model system for studies of photosynthetic pathway evolution in the Poaceae; however, a lack of a robust phylogenetic framework has hindered this possibility. In this study, plastid and nuclear markers were used to reconstruct evolutionary relationships among Neurachninae species. In addition, photosynthetic types were determined with carbon isotope ratios, and genome sizes with flow cytometry. A high frequency of autopolyploidy was found in the Neurachninae, including in Neurachne munroi F.Muell. and Paraneurachne muelleri S.T.Blake, which independently evolved C4 photosynthesis. Phylogenetic analyses also showed that following their separate C4 origins, these two taxa exchanged a gene encoding the C4 form of phosphoenolpyruvate carboxylase. The C3–C4 intermediate Neurachne minor S.T.Blake is phylogenetically distinct from the two C4 lineages, indicating that intermediacy in this species evolved separately from transitional stages preceding C4 origins. The Neurachninae shows a substantial capacity to evolve new photosynthetic pathways repeatedly. Enablers of these transitions might include anatomical pre-conditions in the C3 ancestor, and frequent autopolyploidization. Transfer of key C4 genetic elements between independently evolved C4 taxa may have also facilitated a rapid adaptation of photosynthesis in these grasses that had to survive in the harsh climate appearing during the late Pliocene in Australia.

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A new species of Neurachne (Poaceae) from Western Australia

Cited by 2 publications

References 6 publications

Taxonomic research and the conservation status of flora in the Yilgarn Banded Iron Formation ranges

Taxonomic research and the conservation status of flora in the Yilgarn Banded Iron Formation ranges

Multiple photosynthetic transitions, polyploidy, and lateral gene transfer in the grass subtribe Neurachninae

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