Species delimitation of Cattleya coccinea and C-mantiqueirae (Orchidaceae): insights from phylogenetic and population genetics analyses

Autor(es)

Rodrigues, Jucelene F. ^[1] ; van den Berg, Cassio ^[2] ; Abreu, Aluana G. ^[3] ; Novello, Mariana ^[1] ; Veasey, Elizabeth A. ^[1] ; Oliveira, Giancarlo C. X. ^[1] ; Koehler, Samantha ^[4]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Dept Genet, Escola Super Agr Luiz de Queiroz, Piracicaba, SP - Brazil

^[2] Univ Estadual Feira de Santana, Dept Ciencias Biol, Feira De Santana, BA - Brazil

^[3] Embrapa Arroz & Feijao, Santo Antonio De Goias, Go - Brazil

^[4] Univ Sao Paulo, Dept Ciencias Biol, Diadema, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: PLANT SYSTEMATICS AND EVOLUTION; v. 301, n. 5, p. 1345-1359, MAY 2015.
• Citações Web of Science: 7

Resumo

The high-altitude Southeastern Brazilian Cattleya coccinea clade includes two taxonomically challenging species, Cattleya coccinea and Cattleya mantiqueirae, the latter considered restricted to the mountain range of Serra da Mantiqueira. To hypothesize the existence of evolutionary independent lineages corresponding to these species, we inferred phylogenetic relationships and described patterns of population genetic diversity and structure of populations from six localities based on ISSR and cpDNA sequence data. Results do not support the species C. coccinea and C. mantiqueirae as previously circumscribed. Most analyses recovered southwestern and northeastern groups along the two mountain ranges, suggesting geography rather than morphology as an important criteria for species delimitation. However, due to the lack of information on the type locality of C. coccinea and the topological complexity of the southwestern area, the taxonomic circumscription of C. coccinea and C. mantiqueirae must be evaluated by additional population sampling. We also propose that the northeastern group comprise at least one distinct species. Also, specimens from Lima Duarte from Serra da Mantiqueira clearly do not belong to neither of the two groups and demand further investigation concerning a possible hybridization scenario of C. coccinea/C. mantiqueirae and C. brevipedunculata. Population genetic patterns of variation are in agreement with pollination observations for this group and with a drift-selection model of speciation. Owing to the high genetic differences among populations, with low levels of variation within populations, conservation priorities should favour protecting as many populations as possible. (AU)

• Processo FAPESP: 06/55121-3 - Sistemática molecular, padrões de diversificação e conservação de orquídeas brasileiras
• Beneficiário: Samantha Koehler
• Linha de fomento: Auxílio à Pesquisa - Apoio a Jovens Pesquisadores
• Processo FAPESP: 11/18751-7 - Filogeografia, genética de populações e delimitação de espécies do complexo Cattleya coccinea (Orchidaceae)
• Beneficiário: Jucelene Fernandes Rodrigues
• Linha de fomento: Bolsas no Brasil - Doutorado
• Processo FAPESP: 11/18532-3 - Filogeografia, genética de populações e delimitação de espécies do complexo Cattleya coccinea (Orquidaceae)
• Beneficiário: Elizabeth Ann Veasey
• Linha de fomento: Auxílio à Pesquisa - Regular