The origins and evolution of the genus Myosotis L. (Boraginaceae)

Winkworth, Richard C.; Grau, Jürke; Robertson, Alastair W.; Lockhart, Peter J.

doi:10.1016/s1055-7903(02)00210-5

Cited by 94 publications

(79 citation statements)

References 25 publications

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“…This is a scenario shared with several other plant groups, e.g. Coriaria (Yokoyama et al, 2000), Drosera (Rivadavia et al, 2003), the new Zealand hebes (Veronica) (Wagstaff et al, 2002) and Myosotis (Winkworth et al, 2002a). Overall, the good fit of the cpDNA tree with ecology and with biogeographical patterns across the Indian Ocean and the Pacific lends confidence that a significant level of the species phylogeny is contained within the phylogenetic signal of the plastid tree.…”

Section: Fit With Ecology and Distributionmentioning

confidence: 72%

A plastid tree can bring order to the chaotic generic taxonomy of Rytidosperma Steud. s.l. (Poaceae)

Humphreys¹,

Pirie²,

Linder³

2010

Molecular Phylogenetics and Evolution

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Rytidosperma s.l., wallaby grasses and allies, is in dire need of a single, unanimously accepted generic taxonomy. Motivated by the desire to establish a generic classification that complies with phylogeny, we investigated how much phylogenetic signal is contained within a plastid (cpDNA) tree, given that the nrDNA tree (ITS) was uninformative and that a phylogenetic hypothesis based on a single genome may not be reliable. We find that the plastid tree is significantly different from a morphological cladogram and show that this is the result of homoplasy in the morphological dataset. Treated individually, several morphological characters fit the plastid tree very well. Similarly, we find a good fit of the plastid tree with ecological and distribution characters and with biogeographical patterns in the Southern Hemisphere. We conclude that a significant level of the species phylogeny is resolved by the plastid tree and are confident it can form a sound basis for a reconsideration of generic limits. None of the currently recognised seven genera in the Rytidosperma clade is monophyletic. Therefore, we propose combining the segregate genera in Australasia within a broadly construed Rytidosperma, including all the species from Australia, New Guinea, New Zealand and South America.

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Section: Fit With Ecology and Distributionmentioning

confidence: 72%

A plastid tree can bring order to the chaotic generic taxonomy of Rytidosperma Steud. s.l. (Poaceae)

Humphreys¹,

Pirie²,

Linder³

2010

Molecular Phylogenetics and Evolution

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“…The same regions used by Zimmer et al (2002) were chosen for sequencing, as they were useful in resolving relationships within Gesnerioideae, with the addition of the psbA-trnK spacer region (Winkworth et al 2002a). The ITS and trnL-trnF data sets have been shown to have great utility in generic and family limitations (Baldwin et al 1995;review in Shaw et al 2005).…”

Section: Species Samplingmentioning

confidence: 99%

“…The primers trnE and trnTr (Doyle et al 1992) were used to amplify the trnE-trnT intergenic spacer. The intergenic spacer psbA-trnK was amplified with trnK3F and PSBAR (Winkworth et al 2002a).…”

Section: Species Samplingmentioning

confidence: 99%

New World Origins of Southwest Pacific Gesneriaceae: Multiple Movements Across and Within the South Pacific

Woo

Funke

Smith

et al. 2011

International Journal of Plant Sciences

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“…A phylogenetic study of Myosotis using nrDNA ITS sequence data by Winkworth et al (2002a) included Myosotidium, but the sampling of other Boraginaceae was not sufficiently large to usefully elucidate its relationships. The ITS data presented here indicate that Myosotidium is allied to Omphalodes and these two genera comprise a distinct group (bootstrap support 93.2%) from other genera of Cynoglosseae (Fig.…”

Section: Leucopogon Parviflorusmentioning

confidence: 99%

Late-Cenozoic origin and diversification of Chatham Islands endemic plant species revealed by analyses of DNA sequence data

Heenan

Mitchell

Lange³

et al. 2010

New Zealand Journal of Botany

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The relationships of 35 taxa endemic to the Chatham Islands and their close relatives were investigated using DNA sequence data. This study implies that the closest relatives of many of the endemic species are widespread and common species that occur on either of the main New Zealand islands. Hypotheses that the majority of the Chatham Island endemic plants have their closest relatives in northern North Island or southern South Island are not supported. The closest relative for the monotypic Myosotidium hortensium occurs in the Mediterranean, indicating successful long-distance transoceanic dispersal. Patterns of dispersal and estimates of divergence times were determined, and we relate these data to hypotheses of the islands' lateCenozoic geological history. The Chatham Island endemic taxa differ from their closest relatives by between 0.0 and 6.4% sequence divergence (mostly B1.5%). Divergence time estimates determined for 19 taxa using molecular clock analyses identified a large group of taxa whose divergence times wereB2.4 Myr, and four species with divergence times!3.54 Myr. Divergence time estimates for Chatham Island endemic plants are congruent with two late-Cenozoic geological events. First, the emergence of land 6.0 Myr following eruption of the Mangere Volcano, and second, uplift of the submerged Southern Volcanics, Mangere Volcano and Rangitihi Volcanics between 3.0 and 2.0 Myr.Keywords: Chatham Islands; dispersal; DNA sequence data; geology; molecular clock; New Zealand flora; speciation Introduction Phylogenetic studies of vascular plants endemic to isolated oceanic islands such as the Hawaian archipelago (Baldwin et al. 1991; Wagner & Funk 1995), Canary Islands (GJ Allan et al. 2004; Moore et al. 2002) and Juan Fernandez Islands (Crawford et al. 1998) have advanced understanding and facilitated the development of hypotheses on the evolutionary history of oceanic islands and their biotas (Chen & He 2009; Heaney 2007;Whittaker et al. 2008). New Zealand is also cited as an important biogeographic region and there has been much discussion about the flora having a Gondwanan ancestry and being vicariant (Craw 1989) or being more recent and having arrived primarily by dispersal (McGlone et al. 2001;Pole 1994). Within New Zealand, there has been debate about the effects of glaciation and glacial refugia on plant distributions (Burrows 1965;Wardle 1963Wardle , 1988 and the importance of the Alpine Fault (Heads 1998; McGlone 1985). Most of this debate has focused on the two main islands, North Island and South Island. Often overlooked biogeographic features of New Zealand are the more distant *Corresponding author. Email: heenanp@landcareresearch.co.nz Vol. 48, No. 2, June 2010, 83Á136 island groups of the Kermadec Islands, subantarctic islands and Chatham Islands. New Zealand Journal of BotanyThe Chatham Island archipelago (1768W and 448S; Fig. 1) is located at the eastern end of the Chatham Rise, some 850 km to the east of the main islands of New Zealand, and is the easternmost extension of th...

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The origins and evolution of the genus Myosotis L. (Boraginaceae)

Cited by 94 publications

References 25 publications

A plastid tree can bring order to the chaotic generic taxonomy of Rytidosperma Steud. s.l. (Poaceae)

A plastid tree can bring order to the chaotic generic taxonomy of Rytidosperma Steud. s.l. (Poaceae)

New World Origins of Southwest Pacific Gesneriaceae: Multiple Movements Across and Within the South Pacific

Late-Cenozoic origin and diversification of Chatham Islands endemic plant species revealed by analyses of DNA sequence data

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