Abstract
The subtribe Otachyriinae was established, within tribe Paniceae, by Butzin in 1970, originally including 18 genera. Recent phylogenetic studies, based on molecular data, indicated that Otachyriinae belongs to tribe Paspaleae and is represented by the genera Anthaenantia, Hymenachne, Dallwatsonia, Otachyrium, species of Panicum sect. Laxa, Plagiantha, and Steinchisma. These taxa show a peculiar diversity in photosynthetic types, including C4 species, C3–C4 intermediates and C3 species. The internal evolutionary relationships among members of Otachyriinae have not yet been explored in detail. With the aim of providing new evidence to understand phylogenetic relationships of taxa included in Otachyriinae, 21 new sequences of the ndhF gene from 34 species were generated and analyzed using Bayesian inference and maximum parsimony (MP). The evolution of photosynthetic pathway was studied employing MP, Markov chain Monte Carlo, and maximum likelihood methods. Our results confirm that subtribe Otachyriinae is monophyletic. Within the subtribe, Anthaenanthia is a monophyletic C4 genus and is sister to the remaining species included in this treatment. Hymenachne and Panicum sect. Laxa, in its traditional concept, are polyphyletic; Dallwatsonia, P. auritum, and P. hemitomon are treated within Hymenachne, while three species of Panicum sect. Laxa are considered a new genus in the subtribe. The genus Otachyrium is paraphyletic, while all species of Steinchisma are recovered as a monophyletic group with high support. Finally, our data suggest that C4 and C3–C4 photosynthesis evolved just once each during the speciation of the subtribe from a C3 ancestor.
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Acknowledgments
This study was supported by Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), grants PID 11220100207 and PIP 11220100100155 and by the National Geographic Society, grant 8862-10. The authors sincerely thank two anonymous reviewers for comments that greatly strengthened the manuscript.
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Appendix
Appendix
Sampled taxa, voucher specimens from which DNA was extracted for sequencing, and GenBank accession numbers. Specimens sequenced for this paper are in bold and underlined
Tribe Andropogoneae
Phacelurus digitatus (Sibth. & Sm.) Griseb., AF117418
Sorghum bicolor (L.) Moench, U21981
Zea mays L., U21985
Tribe Arundinelleae
Arundinella hirta (Thunb.) Tanaka, AF117393
Arundinella nepalensis Trin., AF117394
Tribe Paspaleae
Subtribe Arthropogoninae
Altoparadisium chapadense Filg. & Al., AY029619
Apochloa. subtiramulosa (Renvoize & Zuloaga) Zuloaga & Morrone, AY188490
Arthropogon villosus Nees, AY029622
Coleataenia anceps (Michx.) Soreng, AY188455
Coleataenia caricoides Nees ex Trin. Morrone 4969, GU253330
Coleataenia petersonii (Hitchc. and Ekman) Soreng, AY188479
Coleataenia prionitis (Nees) Soreng, AY029652
Coleataenia rigidula Bosc ex Nees, AY188482
Coleataenia stenodes Griseb. Zuloaga 9540, GU253333
Coleataenia tenera (Beyr. ex Trin.) Soreng, AY188491
Homolepis glutinosa (Sw.) Zuloaga & Soderstr., AY029637
Mesosetum chaseae Luces, AY029641 (Giussani & al. 2001)
Oncorachis ramosa (Zuloaga & Soderstr.) Morrone & Zuloaga, AY029686
Oplismenopsis najada (Hack. & Arechav.) Parodi, AY188453
Phanopyrum gymnocarpon (Elliott) Nash, AY188469
Subtribe Otachyriinae.
Anthaenantia lanata (Kunth) Benth., AY029640
Anthaenantia rufa (Elliott) Schult., Henderson 96820; Dale Thomas 158388
Anthaenantia texana Kral, Kral 93287
Anthaenantia villosa (Michx.) P. Beauv., Kral 93319; Atha 3578
Dallwatsonia felliana B.K. Simon, JN604685.
Hymenachne amplexicaulis (Rudge) Nees, Morrone 5190
Hymenachne amplexicaulis (Rudge) Nees AM849158
Hymenachne donacifolia (Raddi) Chase, AY029635
Hymenachne grumosa (Nees) Zuloaga, AY188468
Hymenachne pernambucense (Spreng.) Zuloaga, AY188478
Hymenachne pseudointerrupta Müll. Hal., Beusehom 4230
Otachyrium aquaticum Send. & Soderstr., Mori 12348
Otachyrium grandiflorum Send. & Soderstr., Fonseca & Alvarenga 2206
Otachyrium piligerum Send. & Soderstr., Rodriguez 157
Otachyrium pterigodium (Trin.) Pilg., Andersson 8880
Otachyrium seminudum Hack. ex Send. & Soderstr., Walter 904; Dias 82
Otachyrium succisum (Swallen) Send. & Soderstr., Jansen-Jacobs 2723; Jansen-Jacobs 2816
Otachyrium versicolor (Döll) Henrard, AY029643
Plagiantha tenella Renvoize, AY029674
Panicum auritum J. Presl ex Nees, Olsen 144
Panicum harleyi D. Salariato, Morrone & Zuloaga, Harley 5480
Panicum hemitomon Schult., Jones 23315
Panicum hylaeicum Mez, AY188470
Panicum leptachne Döll, Longhi-Wagner 9511
Panicum pilosum Sw., AY188480
Panicum polygonatum Schrad., Morrone 4269
Panicum stagnatile Hitchc. & Chase, Harmel 8404
Panicum stevensianum Hitchc. & Chase, Ekman 1088
Steinchisma cuprea (Hitchc. & Chase) W.V. Br., Beetle 7708
Steinchisma decipiens (Nees ex Trin.) W.V. Br., AY188499
Steinchisma exiguiflora (Griseb.) W.V. Br., Zuloaga 9580
Steinchisma hians (Elliot) Nash, AY029685
Steinchisma laxa (Sw.) Zuloaga, AY029655
Steinchisma spathellosa (Döll) Renvoize, AY188500
Steinchisma stenophylla (Hack.) Zuloaga & Morrone, Veredao da Silva 3459, Mendonca 3192
Subtribe Paspalinae
Axonopus anceps (Mez) Hitchc., AY029623
Axonopus hydrolithica Davidse and Zuloaga, AY029642
Hopia obtusa (Kunth) Zuloaga & Morrone, AY029659
Ichnanthus pallens (Sw.) Munro ex Benth., AY029638
Panicum tuerckheimii Hack., AY188494
Panicum validum Mez, AY188495
Paspalum arundinellum Mez, AY029663
Paspalum conjugatum Bergius, AY029669
Paspalum glaziovii (A.G. Burm.) S. Denham, AY029689
Paspalum remotum J. Remy, AY029668
Paspalum vaginatum Sw., AY029665
Renvoizea trinii (Kunth) Zuloaga & Morrone, EU107781
Streptostachys asperifolia Desv., AY029687
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Acosta, J.M., Scataglini, M.A., Reinheimer, R. et al. A phylogenetic study of subtribe Otachyriinae (Poaceae, Panicoideae, Paspaleae). Plant Syst Evol 300, 2155–2166 (2014). https://doi.org/10.1007/s00606-014-1034-8
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DOI: https://doi.org/10.1007/s00606-014-1034-8