| Abstract: | Chromosome numbers and karyotypes of species of Orobanche, Cistanche, and Diphelypaea (Orobanchaceae) were investigated, and 108 chromosome counts of 53 taxa, 19 counted for the first time, are presented with a thorough compilation of previously published data. Additionally, karyotypes of representatives of these genera, including Orobanche sects. Orobanche and Trionychon, are reported. Cistanche (x = 20) has large meta- to submetacentric chromosomes, while those of Diphelypaea (x = 19) are medium-sized submeta-to acrocentrics. Within three analyzed sections of Orobanche, sects. Myzorrhiza (x = 24) and Trionychon (x = 12) possess medium-sized submeta- to acrocentrics, while sect. Orobanche (x = 19) has small, mostly meta- to submetacentric, chromosomes. Polyploidy is unevenly distributed in Orobanche and restricted to a few lineages, e.g., O. sect. Myzorrhiza or Orobanche gracilis and its relatives (sect. Orobanche). The distribution of basic chromosome numbers supports the groups found by molecular phylogenetic analyses: Cistanche has x = 20, the Orobanche-group (Orobanche sect. Orobanche, Diphelypaea) has x = 19, and the Phelipanche-group (Orobanche sects. Gymnocaulis, Myzorrhiza, Trionychon) has x = 12, 24. A model of chromosome number evolution in Orobanche and related genera is presented: from two ancestral base numbers, xh = 5 and xh = 6, independent polyploidizations led to x = 20 (Cistanche) and (after dysploidization) x = 19 (Orobanche-group) and to x = 12 and x = 24 (Phelipanche-group), respectively. |
| Genre: | Article |
| ProdID: | 70027496 |
| Citation Author: | Schneeweiss, G. M.; Palomeque, T.; Colwell, A. E.; Weiss-Schneeweiss, H. |
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| Citation End Page: | 448 |
| Citation Issue: | 3 |
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| Citation Language: | English |
| Citation Larger Work Title: | American Journal of Botany |
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| Citation Number Of Pages: | 10 |
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| Citation Search Results Text: | Chromosome numbers and karyotype evolution in holoparasitic Orobanche (Orobanchaceae) and related genera; 2004; Article; Journal; American Journal of Botany; Schneeweiss, G. M.; Palomeque, T.; Colwell, A. E.; Weiss-Schneeweiss, H. |
| Citation Start Page: | 439 |
| Citation Volume: | 91 |
| Citation Year: | 2004 |
| Type: | citation/reference |
| Text: | Chromosome numbers and karyotype evolution in holoparasitic Orobanche (Orobanchaceae) and related genera; 2004; Article; Journal; American Journal of Botany; Schneeweiss, G. M.; Palomeque, T.; Colwell, A. E.; Weiss-Schneeweiss, H. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| Date Other: | Thu, 1 Jan 2004 00:00 -0600 |
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