Abstract
Parsimony analysis of 31 sequences of the chloroplast locus ndhF was used to address questions of subfamilial phylogeny in Bromeliaceae. Results presented here are congruent with those from chloroplast DNA restriction site analysis in recognizing a clade containing Bromelioideae and Pitcairnioideae, and in resolving Tillandsioideae near the base of the family. Placements of several taxonomically difficult genera (e.g., Glomeropitcairnia and Navia) corroborate those of traditional treatments; however, these data suggest that Brocchinia (Pitcairnioideae) is the sister group to the remainder of Bromeliaceae. Further evidence for the paraphyly of Pitcairnioideae includes the resolution of Puya as the sister group to Bromelioideae. Implications for taxonomic realignment at the subfamily level are considered.
Highlights
Bromeliaceae are largelya neotropicalassemblageexhibitingnotable morphological,physiological,and ecological variability(Pittendrigh,1948; Tomlinson,1969; Benzing and Renfrow,1974; Smith and Downs, 1974, 1977, 1979; Benzing, 1980; Smith,1989; Martin,1994)
Within theconstraintosf tissueavailability,generawere selectedthatrepresent the taxonomic,morphological,and ecological variabilitywithinbromeliad subfamilies.All BromeliaceaendhFsequences used in thisstudy have been submittedto GenBank (Table 1)
InitialndhFsequences forBromeliaceae wereobtainedin a preliminary studyusing primerspublished in Olmstead and Sweere (1994)
Summary
Departmentof Environmentaland Resource Sciences Universityof Nevada, Reno, NV 89557. the subject of much speculationand contention(Schimper, 1888; Mez, 1904; Tietze, 1906; Pittendrigh 948; Tomlinson, 1969; Benzing, Givnish, and Bermudes, 1985; Smith,1989). The subject of much speculationand contention(Schimper, 1888; Mez, 1904; Tietze, 1906; Pittendrigh 948; Tomlinson, 1969; Benzing, Givnish, and Bermudes, 1985; Smith,1989). Onlyrecentlyhave cladisticanalyses of both morphologicaland moleculardata been used to address relationshipsamong the primarylines of Bromeliaceae. Arsimonyanalysis of rbcL sequences (Clark and Clegg, 1990) is in agreementwiththefindingsof Gilmartinand Brown (1987) in placingPitcairnioideaenearthebase of thefamily.a notable featureof the rbcL study (Clark and Clegg, 1990) is theinstabilityof thedata withrespectto resolutionof subfamilyrelationships(i.e., maximum-likelihood analyses of all data and of thirdcodon positions alone supportBromelioideaeand Tillandsioideae,respectively,as basal in Bromeliaceae). Recent studieshave used ndhF sequences to resolvephylogenetic relationshipsin dicot (Olmstead and Sweere, 1994; Scotland et al, 1995; Olmstead and Reeves, 1995) and monocot(Clark,Zhang, and Wendel, 1995; Neyland and Urbatsch,1996) families
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