IBONE   05434
INSTITUTO DE BOTANICA DEL NORDESTE
Unidad Ejecutora - UE
congresos y reuniones científicas
Título:
Use of molecular markers in the taxonomic resolution of a species complex of Saccharum L. (Poaceae - Andropogoneae)
Autor/es:
WELKER C.A.D.; SOUZA-CHIES T.T.; LONGHI-WAGNER, H.M.; PEICHOTO M.C.; MCKEIN M.R.; KELLOG E.A.
Lugar:
Salvador (Bahía)
Reunión:
Congreso; IX Congreso Latinoamericano de Botánica LXV Congresso Nacional de Botanica e XXXIV Encontro Reginal de Botanicos; 2014
Resumen:
The genus Saccharum L.,
in the broad sense including the species of Erianthus Michx., comprises 35-40
species from tropics and subtropics of the world. Three native species of Saccharum
occur in Brazil, in addition to sugarcane (S. officinarum L.) that is cultivated
and is economically important. However, the circumscription of the native
species is confusing; specimens occur with intermediate morphology between S.
angustifolium (Nees) Trin. and S. villosum Steud. (S. aff.
villosum). In order to better define the taxonomic circumscription of
these taxa, molecular cloning of five regions of four low-copy nuclear loci was
performed: Aberrant panicle organization1 (apo1), Dwarf8 (d8),
two exons of Erect panicle2 (ep2-ex7 and ep2-ex8),
and Retarded palea1 (rep1). The molecular analysis showed that
all taxa belonging to this species complex are polyploid and S.
angustifolium, S. villosum,
and S. asperum (Nees) Steud. are distinct taxa. The plants with intermediate
morphology (S. aff. villosum) have a complex evolutionary history
and are probably the result of hybridization events. The use of more molecular
markers, as well as cytogenetic analysis, may confirm whether these plants are actually
natural hybrids between S. angustifolium and S. villosum. (CNPq,
Capes).