Phylogenetic Analysis of Microseris (Asteraceae), Including a Newly Discovered Andean Population from Peru
In high elevation habitats of the Peruvian Andes a new population of Microseris (Asteraceae, Lactuceae) related to the single South American species, M. pygmaea, recently was discovered. Microseris pygmaea occurs at lower elevations in Chile and has originated after
long-distance dispersal from a Californian progenitor. Differences in flowering traits and habitat preferences of the new population raised the question of its precise phylogenetic affiliation. The analysis of the nuclear rDNA internal transcribed spacer (ITS) region of all Microseris
species revealed the Peruvian plants as part of the Chilean M. pygmaea clade. Molecular, ecological, and physiological data resulted in an interpretation of the Peruvian population as derived from Chilean progenitors instead of being remnants of stepping-stone dispersal from North America
through the Andes to Chile. Differences in ITS sequences found in this study compared to earlier ones were explained by the occurrence of two different rDNA clusters in the genome of Microseris, which were preferentially amplified by differences in the PCR protocols.
Document Type: Regular Paper
Publication date: 01 July 2004
- Systematic Botany is the scientific journal of the American Society of Plant Taxonomists and publishes four issues per year.
2011 Impact Factor: 1.517
2011 ISI Journal Citation Reports® Rankings: 87/190 - Plant Sciences
34/45 - Evolutionary Biology - Editorial Board
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