| Abstract Detail
Systematics Section / ASPT Mavrodiev, Evgeny V. [1], Nawchoo, Irshad [2], Soltis, Douglas E. [3], Soltis, Pamela S. [1]. Molecular data reveal that the allotetraploid Tragopogon kashmirianus Singh, a narrow endemic of Kashmir, is distinct from the North American T. mirus. TRAGOPOGON kashmirianus (Asteraceae) was described in 1976 based on collections from a small geographic area of Kashmir. Cytological data indicated that the newly described species is tetraploid with 2n = 24. The tetraploid is morphologically similar to T. mirus from North America, an allotetraploid named in 1950 that has formed multiple times in western North America in the last 80 years from the introduced diploids T. dubius and T. porrifolius (salsify). Tragopogon dubius occurs in Kashmir, and T. porrifolius has probably been introduced to the region. Singh (1976) therefore suggested that T. kashmirianus may have formed from the same diploid parental combination as T. mirus. To determine if T. kashmirianus is an additional, independent formation of T. mirus, we investigated ITS, ETS, and plastid sequence data (five regions) of T. kashmirianus, as well other species (T. afganicus, T. badachschanicus, T. porrifolius, T. pratensis, T. orientalis, T. subalpinus, T. trachycarpus, T. gracilis, and T. dubius) reported from Kashmir, northern India, and neighboring countries from Central Asia. Molecular data indicate that the parents of T. kashmirianus are not the European T. porrifolius and T. dubius, the two parents of T. mirus. Our data also indicate that “T. dubius” from Kashmir is distinct from collections of T. dubius from Europe and likely represents a previously unrecognized species. Morphological data also indicate that “T. dubius” from India is distinct from European T. dubius (life history, branching pattern, and achene morphology). The exact parentage of T. kashmirianus is still unclear, but the likely parents are species from Kashmir/India. Species from this region form a distinct clade in broad analyses of Tragopogon. Molecular data suggest several possible parents from among this clade (e.g., T. badachschanicus, T. subalpinus, T. gracilis, and “T. dubius” from India). Additional study is needed to pinpoint the exact parentage of T. kashmirianus.
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1 - University of Florida, Department of Botany, Florida Museum of Natural History, P.O. Box 117800, Gainesville, Florida, 32611-7800, USA
2 - University of Kashmir, Botany, Srinagar, J&K, 190006, India
3 - University of Florida, Department of Botany, 220 Bartram Hall, P.O. Box 118526, Gainesville, Florida, 32611-8526, USA
Keywords:
polyploidy
Tragopogon
rDNA and plastid sequence data.
Presentation Type: Poster:Posters for Sections
Session: 48-201
Location: Auditorium/Bell Memorial Union
Date: Tuesday, August 1st, 2006
Time: 12:30 PM
Abstract ID:544 |
