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- Title
Exceedingly high chromosome number in Strasburgeriaceae, a monotypic family endemic to New Caledonia.
- Authors
Oginuma, K.; Munzinger, J.; Tobe, H.
- Abstract
We present the first report on the chromosome number of Strasburgeria robusta, which is confined to montane forests of New Caledonia and is the only known species in Strasburgeriaceae. The species has 2 n = 500, which is an exceedingly high chromosome number in angiosperms. Within Crossosomatales, molecular evidence has indicated that S. robusta is sister to Ixerba brexioides, which is endemic to New Zealand and is the sole species in Ixerbaceae. Comparisons to the chromosome number of I. brexioides (2 n = 50) support a close affinity between the two species because they share the base number x = 25. It is generally accepted that an increase in ploidy is associated with the origin of novel adaptations. A high level of polyploidy (20 x with x = 25) may have allowed S. robusta to survive on a fragment of Gondwana by adapting to its ultrabasic substrate.
- Subjects
NEW Caledonia; ENDEMIC plants; ANGIOSPERMS; FOREST plants; PLANT species; PLANT classification
- Publication
Plant Systematics & Evolution, 2006, Vol 262, Issue 1/2, p97
- ISSN
0378-2697
- Publication type
Article
- DOI
10.1007/s00606-006-0451-8