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PeerJ

Title:		Characterization of sympatric Platanthera bifolia and Platanthera chlorantha (Orchidaceae) populations with intermediate plants
Author(s):		Esposito F; Vereecken NJ; Gammella M; Rinaldi R; Laurent P; Tyteca D;
Address:		"Earth and Life Institute-Biodiversity Research Centre, Universite Catholique de Louvain, Louvain-la-Neuve, Belgium. Agroecology Lab, Brussels Bioengineering School, Universite libre de Bruxelles (ULB), Brussels, Belgium. Department of Biology, University of Naples Federico II, Napoli, Italy. Unit of General Chemistry, Universite Libre de Bruxelles, Brussels, Belgium"
Journal Title:		PeerJ
Year:		2018
Volume:		20180125
Issue:
Page Number:		e4256 -
DOI:		10.7717/peerj.4256
ISSN/ISBN:		2167-8359 (Print) 2167-8359 (Electronic) 2167-8359 (Linking)
Abstract:		"Platanthera bifolia and P. chlorantha are terrestrial and rewarding orchids with a wide Eurasian distribution. Although genetically closely related, they exhibit significant morphological, phenological and ecological differences that maintain reproductive isolation between the species. However, where both species co-occur, individuals with intermediate phenotypic traits, often considered as hybrids, are frequently observed. Here, we combined neutral genetic markers (AFLPs), morphometrics and floral scent analysis (GC-MS) to investigate two mixed Platanthera populations where morphologically intermediate plants were found. Self-pollination experiments revealed a low level of autogamy and artificial crossings combined with assessments of fruit set and seed viability, showed compatibility between the two species. The results of the genetic analyses showed that morphologically intermediate plants had similar genetic patterns as the P. bifolia group. These results are corroborated also by floral scent analyses, which confirmed a strong similarity in floral scent composition between intermediate morphotypes and P. bifolia. Therefore, this study provided a much more detailed picture of the genetic structure of a sympatric zone between two closely allied species and supports the hypothesis that intermediate morphotypes in sympatry could reflect an adaptive evolution in response to local pollinator-mediated selection"
Keywords:		Female fitness Floral scent Genetic markers Hybridization Morphometrics Moth pollination Orchidaceae Phenotypic selection Platanthera Reproductive isolation;
Notes:		"PubMed-not-MEDLINEEsposito, Fabiana Vereecken, Nicolas J Gammella, Maddalena Rinaldi, Rosita Laurent, Pascal Tyteca, Daniel eng 2018/01/31 PeerJ. 2018 Jan 25; 6:e4256. doi: 10.7717/peerj.4256. eCollection 2018"