reconstructing the evolutionary history of species radiations – the impact of hybridisation rob...
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![Page 1: Reconstructing the evolutionary history of species radiations – the impact of hybridisation Rob Smissen with contributions from Ilse Breitwieser, Leon](https://reader035.vdocument.in/reader035/viewer/2022062407/56649d225503460f949f8272/html5/thumbnails/1.jpg)
Reconstructing the evolutionary history of species radiations – the impact of hybridisation
Rob Smissenwith contributions from Ilse Breitwieser, Leon Perrie,
Lara Shepherd, Peter Heenan and others ...
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Leonard Cockayne HH Allan
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“It is quite possible that no other natural area in the world has as great a number of genera whose definition of species is as badly confused by hybrid swarms”
1964. Bulletin of the Torrey Botanical Club 91: 114-140.
Pierre Dansereau
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“The most that can be said about natural hybridisation in the New Zealand flora is that it is well attested in a few genera and is probable in others.”
J.B. Hair 1966N.Z. J. Bot. 4: 559-595.
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Helichrysum lanceolatumAnaphalioides bellidioides
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Helichrysum lanceolatum x Anaphalioides bellidioides
F1
BC1 BC1
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F1BC1
P1
P1
Principal components analysis of AFLP data for mixed population
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P. lessoniihoupara
coastal five-finger
P. crassifoliushoroeka
lancewood
P. crassifolius x P. lessonii
Pseudopanax and hybridisation (Perrie and Shepherd)
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Backcross toBackcross to F1 F2
AFLP – NEWHYBRIDS analysis
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Phormium (Harakeke: New Zealand flax)
P. tenax
P. cookianum
F1 hybrid
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P. tenaxP. cookianum
Okiwi Bay
Structure estimates of ancestry from AFLP data
seed pods of typical Phormium and those of Okiwi Bay P. tenax
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A contemporary biosystematic view
• Many hybrids well documented, few dismissed
• Geneflow among species seems limited overall
• Neo-allopolyploidy is well evidenced
• Homoploid hybrid species not yet demonstrated
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See also, Pelser et al. American Journal of Botany 97(5): 856–873. 2010.
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Asplenium polyploid evolution
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Pachycladon
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Arabidopsis
Pachycladon
Pachycladon
Brassica
Simplified low-copy nuclear gene-treenon-monophyly of duplicated gene copies
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Raoulia alliance 2n=28+
Anaphalioides
Rachelia
Leucogenes
Ewartia
Raoulia Helichrysum
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Craspedia 2n=22+
Allopolyploidy followed by aneuploid reduction?
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Summary – hybridisation in the NZ flroa
•Contemporary hybridisation frequent
•Contemporary gene-flow among species is limited
•Aallopolyploid speciation important in some groups
•Paleo-allo-polyploidy in species rich groups
•Not certain how important homoploid hybrid speciation and introgression have been in species radiations
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Acknowledgements
• Ilse Breitwieser & fellow symposium speakers• Mercè Galbany-Casals• NZPRN members• Leon Perrie and Lara Shepherd (for Asplenium and
Pseudopanax)• Peter Heenan (Pachycladon)