Although morphologically well defin

Although morphologically well defined, the phylogeny and taxonomy of Myosotis has been uncertain. In particular it has been unclear whether the genus had a Northern Hemisphere or Australasian origin. However, separate analyses of the ITS and the 3' region of matK, as well as a combined analysis of ITS, 3' matK, the psbA-trnA spacer, and 3' ndhF regions indicate that several distinct lineages exist within Myosotis and strongly support a Northern Hemisphere origin for the genus. Further, the observed transoceanic distributions and levels of genetic divergence between lineages indicate that long distance dispersal has been important for establishing the current geographic range expansion of Myosotis. Our molecular data also suggest that the diversification of Australasian Myosotis has occurred since the late Tertiary and is largely due to radiation within and from New Zealand. This inference is consistent with the findings of recent phylogenetic studies on other New Zealand alpine genera. Our results highlight the important role played by late Tertiary and Quaternary climate change in explaining current floristic diversity. The genetic relationships reported here also suggest that the current infrageneric taxonomy of Myosotis does not fully reflect the evolution of the genus

Results (Indonesian) 2:

Meskipun morfologis didefinisikan dengan baik, filogeni dan taksonomi Myosotis telah pasti. Secara khusus telah jelas apakah genus memiliki belahan bumi utara atau asal Australasia. Namun, analisis terpisah dari ITS dan 3 'daerah matK, serta analisis gabungan dari ITS, 3' matK, yang PSBA-tRNA spacer, dan 3 'daerah ndhF menunjukkan bahwa beberapa garis keturunan yang berbeda ada dalam Myosotis dan sangat mendukung asal Northern Hemisphere untuk genus. Selanjutnya, distribusi melintasi samudra diamati dan tingkat perbedaan genetik antara garis keturunan menunjukkan bahwa penyebaran jarak jauh telah penting untuk membangun perluasan jangkauan geografis saat Myosotis. data molekuler kami juga menyarankan bahwa diversifikasi Australasian Myosotis telah terjadi sejak Tersier akhir dan sebagian besar disebabkan radiasi dalam dan dari Selandia Baru. Kesimpulan ini konsisten dengan temuan studi filogenetik baru pada lain Selandia Baru alpine genera. Hasil kami menyoroti peran penting yang dimainkan oleh akhir perubahan iklim Tersier dan Kuarter dalam menjelaskan keragaman tumbuhan saat ini. hubungan genetik yang dilaporkan di sini juga menunjukkan bahwa taksonomi infrageneric saat Myosotis tidak sepenuhnya mencerminkan evolusi genus