IAL   21557
INSTITUTO DE AGROBIOTECNOLOGIA DEL LITORAL
Unidad Ejecutora - UE
artículos
Título:
Inflorescence diversity and evolution in the PCK clade (Poaceae: Panicoideae: Paniceae)
Autor/es:
REINHEIMER, RENATA; VEGETTI, ABELARDO
Revista:
PLANT SYSTEMATICS AND EVOLUTION
Editorial:
Springer Wien
Referencias:
Lugar: Viena (Austria); Año: 2008 vol. 275 p. 133 - 167
ISSN:
0378-2697
Resumen:
The PCK Clade, represented by six-nine genera, is a monophyletic group situated within the Paniceae tribe. The highly diverse inflorescence of the Clade provides an interesting system for study the morphological evolution and also may aid in better understanding of its unclear sistematic. The inflorescence structure of 110 members of the Clade has been investigated. Inflorescences are polytelic. At least twentyone different inflorescence subtypes were identified. Fourteen variable inflorescence characters were found, among which some have suprageneric or infrageneric value and others are polymorphic. A key for identification of inflorescence types is presented. Nine processes have been identified as responsible for inflorescence diversification. Highly branched inflorescences with different internode length are present in the basal genus whereas truncated inflorescences morphologies appear late in the history of the clade. The precise timing of morphological changes is impossible to assess until we have a well supported phylogeny for the clade.