Evolutionary origin of the asteraceae capitulum: Insights from calyceraceae
Premise of the study: Phylogenies based on molecular data are revealing that generalizations about complex morphological structures often obscure variation and developmental patterns important for understanding the evolution of forms, as is the case for inflorescence morphology within the well-suppo...
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todo:paper_00029122_v99_n1_p1_Pozner2023-10-03T13:54:43Z Evolutionary origin of the asteraceae capitulum: Insights from calyceraceae Pozner, R. Zanotti, C. Johnson, L.A. Asteraceae Calyceraceae Capitulum Evolution Inflorescence MGCA clade dicotyledon mitochondrial DNA molecular analysis morphology optimization phylogenetics phylogeny scanning electron microscopy angiosperm article Asteraceae evolution genetics growth, development and aging histology inflorescence phylogeny scanning electron microscopy Angiosperms Asteraceae Biological Evolution Inflorescence Microscopy, Electron, Scanning Phylogeny Asteraceae Calyceraceae Goodeniaceae Menyanthaceae Thyrsoidea Premise of the study: Phylogenies based on molecular data are revealing that generalizations about complex morphological structures often obscure variation and developmental patterns important for understanding the evolution of forms, as is the case for inflorescence morphology within the well-supported MGCA clade (Menyanthaceae + Goodeniaceae + Calyceraceae + Asteraceae). While the basal families share a basic thyrsic/thyrsoid structure of their inflorescences, Asteraceae possesses a capitulum that is widely interpreted as a racemose, condensed inflorescence. Elucidating the poorly known inflorescence structure of Calyceraceae, sister to Asteraceae, should help clarify how the Asteraceae capitulum evolved from thyrsic/thyrsoid inflorescences. • Methods: The early development and structure of the inflorescence of eight species (five genera) of Calyceraceae were studied by SEM, and patterns of evolutionary change were interpreted via phylogenetic character mapping. • Key results: The basic inflorescence structure of Calyceraceae is a cephalioid (a very condensed botryoid/thyrsoid). Optimization of inflorescence characters on a DNA sequence-derived tree suggests that the Asteraceae capitulum derives from a simple cephalioid through two morphological changes: loss of the terminal flower and suppression of the cymose branching pattern in the peripheral branches. • Conclusions: Widely understood as a condensed raceme, the Asteraceae capitulum is the evolutionary result of a very reduced, condensed thyrsoid. Starting from that point, evolution worked separately only on the racemose developmental control/pattern within Asteraceae and mainly on the cymose developmental control/pattern within Calyceraceae, producing head-like inflorescences in both groups but with very different diversification potential. We also discuss possible remnants of the ancestral cephalioid structure in some Asteraceae. © 2012 Botanical Society of America. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_00029122_v99_n1_p1_Pozner |
| institution |
Universidad de Buenos Aires |
| institution_str |
I-28 |
| repository_str |
R-134 |
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Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
| topic |
Asteraceae Calyceraceae Capitulum Evolution Inflorescence MGCA clade dicotyledon mitochondrial DNA molecular analysis morphology optimization phylogenetics phylogeny scanning electron microscopy angiosperm article Asteraceae evolution genetics growth, development and aging histology inflorescence phylogeny scanning electron microscopy Angiosperms Asteraceae Biological Evolution Inflorescence Microscopy, Electron, Scanning Phylogeny Asteraceae Calyceraceae Goodeniaceae Menyanthaceae Thyrsoidea |
| spellingShingle |
Asteraceae Calyceraceae Capitulum Evolution Inflorescence MGCA clade dicotyledon mitochondrial DNA molecular analysis morphology optimization phylogenetics phylogeny scanning electron microscopy angiosperm article Asteraceae evolution genetics growth, development and aging histology inflorescence phylogeny scanning electron microscopy Angiosperms Asteraceae Biological Evolution Inflorescence Microscopy, Electron, Scanning Phylogeny Asteraceae Calyceraceae Goodeniaceae Menyanthaceae Thyrsoidea Pozner, R. Zanotti, C. Johnson, L.A. Evolutionary origin of the asteraceae capitulum: Insights from calyceraceae |
| topic_facet |
Asteraceae Calyceraceae Capitulum Evolution Inflorescence MGCA clade dicotyledon mitochondrial DNA molecular analysis morphology optimization phylogenetics phylogeny scanning electron microscopy angiosperm article Asteraceae evolution genetics growth, development and aging histology inflorescence phylogeny scanning electron microscopy Angiosperms Asteraceae Biological Evolution Inflorescence Microscopy, Electron, Scanning Phylogeny Asteraceae Calyceraceae Goodeniaceae Menyanthaceae Thyrsoidea |
| description |
Premise of the study: Phylogenies based on molecular data are revealing that generalizations about complex morphological structures often obscure variation and developmental patterns important for understanding the evolution of forms, as is the case for inflorescence morphology within the well-supported MGCA clade (Menyanthaceae + Goodeniaceae + Calyceraceae + Asteraceae). While the basal families share a basic thyrsic/thyrsoid structure of their inflorescences, Asteraceae possesses a capitulum that is widely interpreted as a racemose, condensed inflorescence. Elucidating the poorly known inflorescence structure of Calyceraceae, sister to Asteraceae, should help clarify how the Asteraceae capitulum evolved from thyrsic/thyrsoid inflorescences. • Methods: The early development and structure of the inflorescence of eight species (five genera) of Calyceraceae were studied by SEM, and patterns of evolutionary change were interpreted via phylogenetic character mapping. • Key results: The basic inflorescence structure of Calyceraceae is a cephalioid (a very condensed botryoid/thyrsoid). Optimization of inflorescence characters on a DNA sequence-derived tree suggests that the Asteraceae capitulum derives from a simple cephalioid through two morphological changes: loss of the terminal flower and suppression of the cymose branching pattern in the peripheral branches. • Conclusions: Widely understood as a condensed raceme, the Asteraceae capitulum is the evolutionary result of a very reduced, condensed thyrsoid. Starting from that point, evolution worked separately only on the racemose developmental control/pattern within Asteraceae and mainly on the cymose developmental control/pattern within Calyceraceae, producing head-like inflorescences in both groups but with very different diversification potential. We also discuss possible remnants of the ancestral cephalioid structure in some Asteraceae. © 2012 Botanical Society of America. |
| format |
JOUR |
| author |
Pozner, R. Zanotti, C. Johnson, L.A. |
| author_facet |
Pozner, R. Zanotti, C. Johnson, L.A. |
| author_sort |
Pozner, R. |
| title |
Evolutionary origin of the asteraceae capitulum: Insights from calyceraceae |
| title_short |
Evolutionary origin of the asteraceae capitulum: Insights from calyceraceae |
| title_full |
Evolutionary origin of the asteraceae capitulum: Insights from calyceraceae |
| title_fullStr |
Evolutionary origin of the asteraceae capitulum: Insights from calyceraceae |
| title_full_unstemmed |
Evolutionary origin of the asteraceae capitulum: Insights from calyceraceae |
| title_sort |
evolutionary origin of the asteraceae capitulum: insights from calyceraceae |
| url |
http://hdl.handle.net/20.500.12110/paper_00029122_v99_n1_p1_Pozner |
| work_keys_str_mv |
AT poznerr evolutionaryoriginoftheasteraceaecapituluminsightsfromcalyceraceae AT zanottic evolutionaryoriginoftheasteraceaecapituluminsightsfromcalyceraceae AT johnsonla evolutionaryoriginoftheasteraceaecapituluminsightsfromcalyceraceae |
| _version_ |
1782029213083107328 |