ORCID Profile
0000-0002-2386-4026
Current Organisations
University of Wollongong
,
Laurence and Co
,
University of Melbourne
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Publisher: Elsevier BV
Date: 11-2022
Publisher: CSIRO Publishing
Date: 2023
DOI: 10.1071/BT22109
Publisher: Frontiers Media SA
Date: 29-06-2022
Abstract: Australia harbours a rich and highly endemic orchid flora with over 90% of native species found nowhere else. However, little is known about the assembly and evolution of Australia’s orchid flora. Here, we used a phylogenomic approach to infer evolutionary relationships, ergence times and range evolution in Pterostylidinae (Orchidoideae), the second largest subtribe in the Australian orchid flora, comprising the genera Pterostylis and Achlydosa . Phylogenetic analysis of 75 plastid genes provided well-resolved and supported phylogenies. Intrageneric relationships in Pterostylis were clarified and monophyly of eight of 10 sections supported. Achlydosa was found to not form part of Pterostylidinae and instead merits recognition at subtribal level, as Achlydosinae. Pterostylidinae were inferred to have originated in eastern Australia in the early Oligocene, coinciding with the complete separation of Australia from Antarctica and the onset of the Antarctic Circumpolar Current, which led to profound changes in the world’s climate. Divergence of all major lineages occurred during the Miocene, accompanied by increased aridification and seasonality of the Australian continent, resulting in strong vegetational changes from rainforest to more open sclerophyllous vegetation. The majority of extant species were inferred to have originated in the Quaternary, from the Pleistocene onwards. The rapid climatic oscillations during the Pleistocene may have acted as important driver of speciation in Pterostylidinae. The subtribe underwent lineage ersification mainly within its ancestral range, in eastern Australia. Long-distance dispersals to southwest Australia commenced from the late Miocene onwards, after the establishment of the Nullarbor Plain, which constitutes a strong edaphic barrier to mesic plants. Range expansions from the mesic into the arid zone of eastern Australia (Eremaean region) commenced from the early Pleistocene onwards. Extant distributions of Pterostylidinae in other Australasian regions, such as New Zealand and New Caledonia, are of more recent origin, resulting from long-distance dispersals from the Pliocene onwards. Temperate eastern Australia was identified as key source area for dispersals to other Australasian regions.
Publisher: Springer Science and Business Media LLC
Date: 12-10-2023
Publisher: Pensoft Publishers
Date: 08-02-2021
DOI: 10.3897/MYCOKEYS.78.60063
Abstract: Ascochyta koolunga (Didymellaceae, Pleosporales) was first described in 2009 (as Phoma koolunga ) and identified as the causal agent of Ascochyta blight of Pisum sativum (field pea) in South Australia. Since then A. koolunga has not been reported anywhere else in the world, and its origins and occurrence on other legume (Fabaceae) species remains unknown. Blight and leaf spot diseases of Australian native, pasture and naturalised legumes were studied to investigate a possible native origin of A. koolunga . Ascochyta koolunga was not detected on native, naturalised or pasture legumes that had leaf spot symptoms, in any of the studied regions in southern Australia, and only one isolate was recovered from P. sativum . However, we isolated five novel species in the Didymellaceae from leaf spots of Australian native legumes from commercial field pea regions throughout southern Australia. The novel species were classified on the basis of morphology and phylogenetic analyses of the internal transcribed spacer region and part of the RNA polymerase II subunit B gene region. Three of these species, Nothophoma garlbiwalawarda sp. nov. , Nothophoma naiawu sp. nov. and Nothophoma ngayawang sp. nov. , were isolated from Senna artemisioides . The other species described here are Epicoccum djirangnandiri sp. nov. from Swainsona galegifolia and Neodidymelliopsis tinkyukuku sp. nov. from Hardenbergia violacea . In addition, we report three new host-pathogen associations in Australia, namely Didymella pinodes on S. artemisioides and Vicia cracca , and D. lethalis on Lathyrus tingitanus . This is also the first report of Didymella prosopidis in Australia.
Publisher: MDPI AG
Date: 27-06-2023
DOI: 10.3390/JOF9070706
Publisher: CSIRO Publishing
Date: 2023
DOI: 10.1071/BT22136
No related grants have been discovered for Allison Mertin.