TY - JOUR
T1 - A biogeographical analysis of Muhlenbergia (Poaceae: Chloridoideae: Cynodonteae: Muhlenbergiinae)
AU - Peterson, Paul M.
AU - Roquet, Cristina
AU - Romaschenko, Konstantin
AU - Herrera Arrieta, Yolanda
AU - Alfonso, Susanna
PY - 2022/5
Y1 - 2022/5
N2 - A phylogeny based on the analysis of six DNA sequence markers (ITS, ndhA intron, rpl32-trnL, rps3, rps16 intron, and rps16-trnK) is used to infer ancestral areas and divergence times, and reconstruct the biogeographical history and evolution of 150 of the 183 (82%) species of Muhlenbergia. Our results suggest that the genus originated 9.3 mya in the Sierra Madre (Occidental and Oriental) in Mexico, splitting into six lineages: M. ramulosa diverging 8.2 mya, M. subg. Muhlenbergia at 5.9 mya, M. subg. Pseudosporobolus at 5.9 mya, M. subg. Clomena at 5.4 mya, M. subg. Bealia at 4.3 mya, and M. subg. Trichochloa at 1 mya, each of these with a high probability of Sierra Madrean origin. Our results further suggest that founder-event speciation from Sierra Madre to South America occurred independently multiple times in all five subgenera during the Pleistocene and late Pliocene. One long-distance dispersal event most likely originating from Central or Eastern North America to East and Central Asia occurred 1.6–1 mya in M. subg. Muhlenbergia. In our cladogram, members of M. subg. Trichochloa show little genetic resolution, suggesting very low levels of divergence among the species, and this may be a consequence of rapid radiation.
AB - A phylogeny based on the analysis of six DNA sequence markers (ITS, ndhA intron, rpl32-trnL, rps3, rps16 intron, and rps16-trnK) is used to infer ancestral areas and divergence times, and reconstruct the biogeographical history and evolution of 150 of the 183 (82%) species of Muhlenbergia. Our results suggest that the genus originated 9.3 mya in the Sierra Madre (Occidental and Oriental) in Mexico, splitting into six lineages: M. ramulosa diverging 8.2 mya, M. subg. Muhlenbergia at 5.9 mya, M. subg. Pseudosporobolus at 5.9 mya, M. subg. Clomena at 5.4 mya, M. subg. Bealia at 4.3 mya, and M. subg. Trichochloa at 1 mya, each of these with a high probability of Sierra Madrean origin. Our results further suggest that founder-event speciation from Sierra Madre to South America occurred independently multiple times in all five subgenera during the Pleistocene and late Pliocene. One long-distance dispersal event most likely originating from Central or Eastern North America to East and Central Asia occurred 1.6–1 mya in M. subg. Muhlenbergia. In our cladogram, members of M. subg. Trichochloa show little genetic resolution, suggesting very low levels of divergence among the species, and this may be a consequence of rapid radiation.
KW - biogeography
KW - classification
KW - ITS
KW - molecular phylogeny
KW - Muhlenbergia
KW - plastid DNA sequences
UR - https://www.scopus.com/record/display.uri?eid=2-s2.0-85115386057&origin=resultslist&sort=plf-f&src=s&st1=A+biogeographical+analysis+of+Muhlenbergia&sid=340b2e983de4e75c5e8e1497ba0f4a50&sot=b&sdt=b&sl=57&s=TITLE-ABS-KEY%28A+biogeographical+analysis+of+Muhlenbergia%29&relpos=0&citeCnt=1&searchTerm=
U2 - 10.1111/jse.12805
DO - 10.1111/jse.12805
M3 - Artículo
SN - 1674-4918
VL - 60
SP - 621
JO - Journal of Systematics and Evolution
JF - Journal of Systematics and Evolution
IS - 3
ER -