A revision of Olearia section Asterotriche (Asteraceae: Asterae)

Messina, Andre; Walsh, N. G.; Hoebee, Susan E.; Green, Peter T.

doi:10.1071/sb14012

Cited by 7 publications

(5 citation statements)

References 39 publications

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“…This species complex has undergone several taxonomic revisions since its first description by Hooker in 1851 (see Smith, James and Ladiges [34] and references therein), reflecting the large amount of phenotypic variation within the species. These results are also consistent with the ongoing difficulties with taxonomy and phylogeny in the Olearia genus [29][30][31][32][33]. Our findings strongly suggest a cryptic species complex in O. pannosa.…”

Section: Leaf Shape and Taxonomysupporting

confidence: 91%

“…However, many species within this genus require further investigation into their taxonomy and phylogeny. This is highlighted by the number of recent studies describing or reinstating Olearia species from both molecular and taxonomic data [29][30][31][32][33][34]. Olearia pannosa (Hook) is a long-lived understory daisy shrub, endemic to southeastern Australia.…”

Section: Introductionmentioning

confidence: 99%

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Genomic, Habitat, and Leaf Shape Analyses Reveal a Possible Cryptic Species and Vulnerability to Climate Change in a Threatened Daisy

Blyth

Christmas²,

Bickerton³

et al. 2021

Life

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Olearia pannosa is a plant species listed as vulnerable in Australia. Two subspecies are currently recognised (O. pannosa subsp. pannosa (silver daisy) and O. pannosa subsp. cardiophylla (velvet daisy)), which have overlapping ranges but distinct leaf shape. Remnant populations face threats from habitat fragmentation and climate change. We analysed range-wide genomic data and leaf shape variation to assess population diversity and divergence and to inform conservation management strategies. We detected three distinct genetic groupings and a likely cryptic species. Samples identified as O. pannosa subsp. cardiophylla from the Flinders Ranges in South Australia were genetically distinct from all other samples and likely form a separate, range-restricted species. Remaining samples formed two genetic clusters, which aligned with leaf shape differences but not fully with current subspecies classifications. Levels of genetic diversity and inbreeding differed between the three genetic groups, suggesting each requires a separate management strategy. Additionally, we tested for associations between genetic and environmental variation and carried out habitat suitability modelling for O. pannosa subsp. pannosa populations. We found mean annual maximum temperature explained a significant proportion of genomic variance. Habitat suitability modelling identified mean summer maximum temperature, precipitation seasonality and mean annual rainfall as constraints on the distribution of O. pannosa subsp. pannosa, highlighting increasing aridity as a threat for populations located near suitability thresholds. Our results suggest maximum temperature is an important agent of selection on O. pannosa subsp. pannosa and should be considered in conservation strategies. We recommend taxonomic revision of O. pannosa and provide conservation management recommendations.

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Section: Leaf Shape and Taxonomysupporting

confidence: 91%

Section: Introductionmentioning

confidence: 99%

Genomic, Habitat, and Leaf Shape Analyses Reveal a Possible Cryptic Species and Vulnerability to Climate Change in a Threatened Daisy

Blyth

Christmas²,

Bickerton³

et al. 2021

Life

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show abstract

“…These findings align with earlier research on the foliar epidermal structure of Aster species (Ambrosone et al, 2023). Nevertheless, this research offers fresh perspectives on the qualitative and quantitative traits of the leaf epidermis of A. glehnii (Messina, 2013). These discoveries advance the knowledge of the taxonomy and evolutionary history of the genus Aster (Prado, 2023).…”

Section: Discussionmentioning

confidence: 99%

Endemic species analysis: Foliar epidermal anatomical characters of Aster glehnii F. Schmidt (Asteraceae)

Zaman,

Lee,

Park

2024

Microscopy Res & Technique

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The classification and identification of Aster glehnii F. Schmidt are determined from its foliar epidermal anatomical features. Scanning electronic microscopy has been used to determine the foliar epidermal anatomical characteristics of the species in detail. This study compared the qualitative and quantitative characteristics of the leaf epidermis of A. glehnii for taxonomic identification to be used as a reference for future studies on the species. A. glehnii has smooth, thin cuticles, depressed anomocytic stomata dispersed randomly throughout the leaf surface, polygonal epidermal cells with straight to slightly curved anticlinal walls, and no trichomes. There are obvious veins containing thick‐walled bundle sheath cells. The stomatal density is between 100 and 150 stomata per millimeter. The vein density ranges from five to 10 veins per millimeter, and the epidermal cells are 10 to 20 μm long and 5 to 10 μm in width. Understanding the connections between the different A. glehnii species and categorizing and identifying them depend heavily on these foliar epidermal structural features. Taxonomy and conservation are closely intertwined because the former serves as the basis for comprehending and safeguarding biodiversity.Research Highlights Optical microscopy of the A. glehnii leaf epidermis for taxonomic identification SEM was used to identify and authenticate endemic species Microscopic identification of endemic species can assist in the conservation

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“…The most detailed work was conducted on Olearia section Asterotriche Benth. using both morphological (Messina et al, 2013) and molecular data (Messina et al, 2014).…”

Section: Astereaementioning

confidence: 99%

Daisies Down Under: Review of the state of taxonomy and phylogenetics of native Australian Asteraceae

Schmidt‐Lebuhn¹

2022

TICA

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A revision of Olearia section Asterotriche (Asteraceae: Asterae)

Cited by 7 publications

References 39 publications

Genomic, Habitat, and Leaf Shape Analyses Reveal a Possible Cryptic Species and Vulnerability to Climate Change in a Threatened Daisy

Genomic, Habitat, and Leaf Shape Analyses Reveal a Possible Cryptic Species and Vulnerability to Climate Change in a Threatened Daisy

Endemic species analysis: Foliar epidermal anatomical characters of Aster glehnii F. Schmidt (Asteraceae)

Daisies Down Under: Review of the state of taxonomy and phylogenetics of native Australian Asteraceae

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