IBODA   05360
INSTITUTO DE BOTANICA DARWINION
Unidad Ejecutora - UE
congresos y reuniones científicas
Título:
Phylogeny of the Paniceae (Poaceae: Panicoideae) integrating chloroplast DNA sequences and morphology.
Autor/es:
MORRONE, OSVALDO; AAGESEN, LONE; SCATAGLINI, MARÍA AMALIA; SALARIATO, DIEGO LIONEL; DENHAM, SILVIA SUYAI; CHEMISQUY, MARIA AMELIA; SEDE, SILVANA MABEL; GIUSSANI, LILIANA MÓNICA; KELLOG, ELIZABETH; ZULOAGA, FERNANDO OMAR
Lugar:
Tucumán, Argentina
Reunión:
Jornada; XXVII Willi Hennig Society Meeting, Tucumán, Argentina.; 2008
Institución organizadora:
Willi Hennig Society
Resumen:
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The
tribe Paniceae currently includes approx. 110 genera and 2000 species worldwide
distributed. The Paniceae exhibits a great morphological and physiological
variability that difficults establishing generic boundaries among its members;
recent molecular studies lead to a new classification of several genera of the
tribe. The present study aims to analyze all genera of the tribe combining
morphological and ndhF sequence data in order to delimit the tribe within the
Poaceae, and to establish generic relationships within it.
As found in earlier studies monophyly of the Paniceae was not supported. The
Paniceae is divided in two mayor clades, recognized as the x=9 and x=10 clades.
The ndhF sequences support a sister-group relationship between the x=10 clade
and the tribe Andropogoneae.
The x=10 clade is defined by a 6 base pair long insertion in the ndhF
sequences. The basal dichotomy divides the group into a small clade integrated
by minor genera from Australia,
India, and Africa,
and a major clade including American taxa only, including some genera, such as Paspalum
and Axonopus, with a high number of species
The distribution of the x=9 clade is mainly Pantropical. Within this clade the
basal dichotomy separates a small clade including the genus Digitaria and
three small genera previously related to taxa of the bristle clade: Anthephora
and related genera. This clade is well supported and defined by a 24 base pair
long deletion within the ndhF sequences. Main clades within the x=9 clade are
the Bristle clade that among other genera includes Setaria, Pennisetum
and Cenchrus, the PEP-CK clade, with Urochloa an genera with a
similar anatomic and photosynthetic syndrome, and the Panicum clade
characterized by having a NAD-me photosynthetic subtype.
Although the morphological characters were homoplastic and lower the
branch supports, they proved to be useful for placing several taxa for which
DNA sequence data were not available.