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Article: The allopolyploid origin of Spiranthes hongkongensis (Orchidaceae)

TitleThe allopolyploid origin of Spiranthes hongkongensis (Orchidaceae)
Authors
KeywordsAllopolyploidy
Fixed heterozygosity
Isozyme
Orchid
Speciation
Spiranthes hongkongensis
Issue Date1996
PublisherBotanical Society of America, Inc (Columbus), Business Office. The Journal's web site is located at http://www.amjbot.org/
Citation
American Journal Of Botany, 1996, v. 83 n. 2, p. 252-260 How to Cite?
AbstractMorphological and ecological similarities between Spiranthes hongkongensis Hu et Barretto and S. sinensis (Pers.) Ames suggest a close evolutionary relationship. The hypothesis that S. hongkongensis evolved through natural hybridization between S. sinensis and S. spiralis was tested using isozyme electrophoresis. A total of 28 isozyme loci were interpreted in the diploid species S. sinensis and S. spiralis, and "fixed heterozygosity" owing to gene duplication was observed at ten of these loci in S. hongkongensis, Isozyme phenotypes provided strong evidence for an allotetraploid origin of S. hongkongensis, with S. sinensis and most likely S. spiralis as its diploid progenitors. Chromosomal counts of S. hongkongensis gave a tetraploid number of ≈60. The allotetraploid species is self-fertile, and completely isolated by sterility barriers from S. sinensis. Premating isolation also exists between S. hongkongensis and S. sinensis due to earlier flowering and autogamy in S. hongkongensis, which may account for the rarity of natural hybrids in the sites of sympatry. The role of the autogamous breeding system in the establishment and spread of S. hongkongensis is discussed.
Persistent Identifierhttp://hdl.handle.net/10722/84711
ISSN
2015 Impact Factor: 2.811
2015 SCImago Journal Rankings: 1.459
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorSun, Men_HK
dc.date.accessioned2010-09-06T08:56:14Z-
dc.date.available2010-09-06T08:56:14Z-
dc.date.issued1996en_HK
dc.identifier.citationAmerican Journal Of Botany, 1996, v. 83 n. 2, p. 252-260en_HK
dc.identifier.issn0002-9122en_HK
dc.identifier.urihttp://hdl.handle.net/10722/84711-
dc.description.abstractMorphological and ecological similarities between Spiranthes hongkongensis Hu et Barretto and S. sinensis (Pers.) Ames suggest a close evolutionary relationship. The hypothesis that S. hongkongensis evolved through natural hybridization between S. sinensis and S. spiralis was tested using isozyme electrophoresis. A total of 28 isozyme loci were interpreted in the diploid species S. sinensis and S. spiralis, and "fixed heterozygosity" owing to gene duplication was observed at ten of these loci in S. hongkongensis, Isozyme phenotypes provided strong evidence for an allotetraploid origin of S. hongkongensis, with S. sinensis and most likely S. spiralis as its diploid progenitors. Chromosomal counts of S. hongkongensis gave a tetraploid number of ≈60. The allotetraploid species is self-fertile, and completely isolated by sterility barriers from S. sinensis. Premating isolation also exists between S. hongkongensis and S. sinensis due to earlier flowering and autogamy in S. hongkongensis, which may account for the rarity of natural hybrids in the sites of sympatry. The role of the autogamous breeding system in the establishment and spread of S. hongkongensis is discussed.en_HK
dc.languageengen_HK
dc.publisherBotanical Society of America, Inc (Columbus), Business Office. The Journal's web site is located at http://www.amjbot.org/en_HK
dc.relation.ispartofAmerican Journal of Botanyen_HK
dc.subjectAllopolyploidyen_HK
dc.subjectFixed heterozygosityen_HK
dc.subjectIsozymeen_HK
dc.subjectOrchiden_HK
dc.subjectSpeciationen_HK
dc.subjectSpiranthes hongkongensisen_HK
dc.titleThe allopolyploid origin of Spiranthes hongkongensis (Orchidaceae)en_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=0002-9122&volume=82&issue=6&spage=76&epage=&date=1995&atitle=The+allopolyploid+origin+of+spiranthes+hongkongensisen_HK
dc.identifier.emailSun, M: meisun@hkucc.hku.hken_HK
dc.identifier.authoritySun, M=rp00779en_HK
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.2307/2445944-
dc.identifier.scopuseid_2-s2.0-0030019254en_HK
dc.identifier.hkuros5769en_HK
dc.identifier.hkuros15581-
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-0030019254&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume83en_HK
dc.identifier.issue2en_HK
dc.identifier.spage252en_HK
dc.identifier.epage260en_HK
dc.identifier.isiWOS:A1996TW24000015-
dc.publisher.placeUnited Statesen_HK
dc.identifier.scopusauthoridSun, M=7403181447en_HK

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