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, x(h) = 5 and x(h) = 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.
journal_name
Am J Botjournal_title
American journal of botanyauthors
Schneeweiss GM,Palomeque T,Colwell AE,Weiss-Schneeweiss Hdoi
10.3732/ajb.91.3.439subject
Has Abstractpub_date
2004-03-01 00:00:00pages
439-48issue
3eissn
0002-9122issn
1537-2197pii
91/3/439journal_volume
91pub_type
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doi:
更新日期:1999-12-01 00:00:00
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更新日期:2001-08-01 00:00:00
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更新日期:2017-09-01 00:00:00
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更新日期:2016-09-01 00:00:00
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更新日期:2017-12-01 00:00:00
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更新日期:2019-04-01 00:00:00
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更新日期:2018-03-01 00:00:00
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更新日期:2020-01-01 00:00:00
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更新日期:2016-11-01 00:00:00
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更新日期:2009-12-01 00:00:00
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更新日期:2004-11-01 00:00:00
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更新日期:2019-11-01 00:00:00