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Molecular Rates Parallel Diversification Contrasts between Carnivorous Plant Sister Lineages 1
Author(s) -
Jobson Richard W.,
Albert Victor A.
Publication year - 2002
Publication title -
cladistics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.323
H-Index - 92
eISSN - 1096-0031
pISSN - 0748-3007
DOI - 10.1111/j.1096-0031.2002.tb00145.x
Subject(s) - biology , carnivorous plant , lineage (genetic) , evolutionary biology , cladogenesis , intron , phylogenetic tree , ecology , predation , gene , genetics , clade
In the carnivorous plant family Lentibulariaceae, the bladderwort lineage ( Utricularia and Genlisea ) is substantially more species‐rich and morphologically divergent than its sister lineage, the butterworts ( Pinguicula ). Bladderworts have a relaxed body plan that has permitted the evolution of terrestrial, epiphytic, and aquatic forms that capture prey in intricately designed suction bladders or corkscrew‐shaped lobster‐pot traps. In contrast, the flypaper‐trapping butterworts maintain vegetative structures typical of angiosperms. We found that bladderwort genomes evolve significantly faster across seven loci (the trn L intron, the second trn L exon, the trn L–F intergenic spacer, the rps 16 intron, rbc L, cox I, and 5.8S rDNA) representing all three genomic compartments. Generation time differences did not show a significant association. We relate these findings to the contested speciation rate hypothesis, which postulates a relationship between increased nucleotide substitution and increased cladogenesis.