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Article: Cleistogamy in Scutellaria indica (Labiatae): Effective mating system and population genetic structure

TitleCleistogamy in Scutellaria indica (Labiatae): Effective mating system and population genetic structure
Authors
KeywordsAllozymes
Cleistogamy
Population genetics tructure
RAPD
Scutellaria indica
Issue Date1999
PublisherBlackwell Publishing Ltd. The Journal's web site is located at http://www.blackwellpublishing.com/journals/MEC
Citation
Molecular Ecology, 1999, v. 8 n. 8, p. 1285-1295 How to Cite?
AbstractScutellaria indica is a perennial herb with both chasmogamous (CH) and cleistogamous (CL) flowers on the same plant in some populations, and only CL flowers in other populations. Actual seed production by CH and CL flowers was investigated in populations of S. indica. The average seed set of CL flowers was 19 times higher than CH flowers, indicating much greater fertilization success. The CL seeds were also significantly heavier than the CH seeds. However, the resource cost of producing a CH flower was much higher than that of producing a CL flower. The CH flower was approximately seven times larger, and its pollen/ovule ratio was approximately five times higher than that of CL flowers. The level and pattern of genetic diversity at both allozyme and random amplified polymorphic DNA (RAPD) levels were consistent with a predominantly selfing system in the species. The average amount of within-population genetic variation was extremely low (A = 1.025, P = 2.36%, H(O) = 0.001 and H(E) = 0.008 based on allozyme data, and P = 8.94% and H(E) = 0.03 based on RAPD data). At the species level, the estimates of total gene diversity (H(T)) were 0.101 based on allozyme data and 0.139 based on RAPD data. A very high level of genetic differentiation occurred between populations (allozyme G(ST) = 0.92 and RAPD G(ST) = 0.81). Genetic drift coupled with predominant cleistogamous selfing apparently played the major role in determining the population genetic-structure in S. indica. Although the features associated with CH and CL flower and seed production seem to be sufficient for the evolution of complete cleistogamy in S. indica, random fixation of alternative alleles for dimorphic or complete cleistogamy in small populations could maintain the multiple strategy of chasmogamous and cleistogamous reproduction in the species.
Persistent Identifierhttp://hdl.handle.net/10722/84790
ISSN
2015 Impact Factor: 5.947
2015 SCImago Journal Rankings: 3.925
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorSun, Men_HK
dc.date.accessioned2010-09-06T08:57:09Z-
dc.date.available2010-09-06T08:57:09Z-
dc.date.issued1999en_HK
dc.identifier.citationMolecular Ecology, 1999, v. 8 n. 8, p. 1285-1295en_HK
dc.identifier.issn0962-1083en_HK
dc.identifier.urihttp://hdl.handle.net/10722/84790-
dc.description.abstractScutellaria indica is a perennial herb with both chasmogamous (CH) and cleistogamous (CL) flowers on the same plant in some populations, and only CL flowers in other populations. Actual seed production by CH and CL flowers was investigated in populations of S. indica. The average seed set of CL flowers was 19 times higher than CH flowers, indicating much greater fertilization success. The CL seeds were also significantly heavier than the CH seeds. However, the resource cost of producing a CH flower was much higher than that of producing a CL flower. The CH flower was approximately seven times larger, and its pollen/ovule ratio was approximately five times higher than that of CL flowers. The level and pattern of genetic diversity at both allozyme and random amplified polymorphic DNA (RAPD) levels were consistent with a predominantly selfing system in the species. The average amount of within-population genetic variation was extremely low (A = 1.025, P = 2.36%, H(O) = 0.001 and H(E) = 0.008 based on allozyme data, and P = 8.94% and H(E) = 0.03 based on RAPD data). At the species level, the estimates of total gene diversity (H(T)) were 0.101 based on allozyme data and 0.139 based on RAPD data. A very high level of genetic differentiation occurred between populations (allozyme G(ST) = 0.92 and RAPD G(ST) = 0.81). Genetic drift coupled with predominant cleistogamous selfing apparently played the major role in determining the population genetic-structure in S. indica. Although the features associated with CH and CL flower and seed production seem to be sufficient for the evolution of complete cleistogamy in S. indica, random fixation of alternative alleles for dimorphic or complete cleistogamy in small populations could maintain the multiple strategy of chasmogamous and cleistogamous reproduction in the species.en_HK
dc.languageengen_HK
dc.publisherBlackwell Publishing Ltd. The Journal's web site is located at http://www.blackwellpublishing.com/journals/MECen_HK
dc.relation.ispartofMolecular Ecologyen_HK
dc.rightsMolecular Ecology. Copyright © Blackwell Publishing Ltd.en_HK
dc.subjectAllozymesen_HK
dc.subjectCleistogamyen_HK
dc.subjectPopulation genetics tructureen_HK
dc.subjectRAPDen_HK
dc.subjectScutellaria indicaen_HK
dc.titleCleistogamy in Scutellaria indica (Labiatae): Effective mating system and population genetic structureen_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=0962-1083&volume=8&spage=1285&epage=1296&date=1999&atitle=Cleistogamy+in+Scutellaria+indica+(Labiatae):+effective+mating+system+and+population+genetic+structureen_HK
dc.identifier.emailSun, M: meisun@hkucc.hku.hken_HK
dc.identifier.authoritySun, M=rp00779en_HK
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1046/j.1365-294X.1999.00691.xen_HK
dc.identifier.pmid10447869-
dc.identifier.scopuseid_2-s2.0-0033178794en_HK
dc.identifier.hkuros44368en_HK
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-0033178794&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume8en_HK
dc.identifier.issue8en_HK
dc.identifier.spage1285en_HK
dc.identifier.epage1295en_HK
dc.identifier.isiWOS:000082256300005-
dc.publisher.placeUnited Kingdomen_HK
dc.identifier.scopusauthoridSun, M=7403181447en_HK

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