Evolution of carnivory in Lentibulariaceae and the Lamiales

Müller KF, Borsch T, Legendre L, Porembski S, Theisen I, Barthlott W

Forschungsartikel (Zeitschrift)

Zusammenfassung

As a basis for analysing the evolution of the carnivorous syndrome in Lentibulariaceae {(Lamiales)}, phylogenetic reconstructions were conducted based on coding and non-coding chloroplast {DNA} {(matK} gene and flanking {trnK} intron sequences, totalling about 2.4 kb). A dense taxon sampling including all other major lineages of Lamiales was needed since the closest relatives of Lentibulariaceae and the position of proto-carnivores were unknown. Tree inference using maximum parsimony, maximum likelihood, and Bayesian approaches resulted in fully congruent topologies within Lentibulariaceae, whereas relationships among the different lineages of Lamiales were only congruent between likelihood and Bayesian optimizations. Lentibulariaceae and their three genera {(Pinguicula}, Genlisea, and Utricularia) are monophyletic, with Pinguicula being sister to a {Genlisea-Utricularia} clade. Likelihood and Bayesian trees converge on Bignoniaceae as sister to Lentibulariaceae, albeit lacking good support. The proto-carnivores {(Byblidaceae}, Martyniaceae) are found in different positions among other Lamiales but not as sister to the carnivorous Lentibulariaceae, which is also supported by {Khishino-Hasegawa} tests. This implies that carnivory and its preliminary stages (proto-carnivores) independently evolved more than once among Lanniales. Ancestral states of structural characters connected to the carnivorous syndrome are reconstructed using the molecular tree, and a hypothesis on the evolutionary pathway of the carnivorous syndrome in Lentibulariaceae is presented. Extreme {DNA} mutational rates found in Utricularia and Genlisea are shown to correspond to their unusual nutritional specialization, thereby hinting at a marked degree of carnivory in these two genera.

Details zur Publikation

Seiten: 14
Veröffentlichungsjahr: 2004
Sprache, in der die Publikation verfasst ist: Englisch