IBONE   05434
INSTITUTO DE BOTANICA DEL NORDESTE
Unidad Ejecutora - UE
artículos
Título:
cpDNA variation in the Turnera sidoides L. complex (Turneraceae): biogeographical implications.
Autor/es:
SPERANZA, P. R.; SEIJO, J. G.; GRELA, I.; VIVIANA GRISELDA SOLIS NEFFA
Revista:
Journal of Biogeography
Referencias:
Año: 2006 vol. 34 p. 427 - 436
Resumen:
ABSTRACT
Aim To analyse the current geographical structure of chloroplast DNA variation
in the Turnera sidoides L. complex in order to establish historical
biogeographical hypotheses for the mid-latitude South American lowlands.
During the Quaternary, the climate shifted from tropical humid to cold dry,
and the vegetation cover has not been stable. The consequences of these
processes on the current distribution of the vegetation of this area have received
very little attention.
biogeographical hypotheses for the mid-latitude South American lowlands.
During the Quaternary, the climate shifted from tropical humid to cold dry,
and the vegetation cover has not been stable. The consequences of these
processes on the current distribution of the vegetation of this area have received
very little attention.
in the Turnera sidoides L. complex in order to establish historical
biogeographical hypotheses for the mid-latitude South American lowlands.
During the Quaternary, the climate shifted from tropical humid to cold dry,
and the vegetation cover has not been stable. The consequences of these
processes on the current distribution of the vegetation of this area have received
very little attention.
biogeographical hypotheses for the mid-latitude South American lowlands.
During the Quaternary, the climate shifted from tropical humid to cold dry,
and the vegetation cover has not been stable. The consequences of these
processes on the current distribution of the vegetation of this area have received
very little attention.
To analyse the current geographical structure of chloroplast DNA variation
in the Turnera sidoides L. complex in order to establish historical
biogeographical hypotheses for the mid-latitude South American lowlands.
During the Quaternary, the climate shifted from tropical humid to cold dry,
and the vegetation cover has not been stable. The consequences of these
processes on the current distribution of the vegetation of this area have received
very little attention.
biogeographical hypotheses for the mid-latitude South American lowlands.
During the Quaternary, the climate shifted from tropical humid to cold dry,
and the vegetation cover has not been stable. The consequences of these
processes on the current distribution of the vegetation of this area have received
very little attention.
Turnera sidoides L. complex in order to establish historical
biogeographical hypotheses for the mid-latitude South American lowlands.
During the Quaternary, the climate shifted from tropical humid to cold dry,
and the vegetation cover has not been stable. The consequences of these
processes on the current distribution of the vegetation of this area have received
very little attention.
Location The mid-latitude South American lowlands extend between c. 20 and
40S and include Uruguay, northern, central and eastern Argentina, southern
Brazil, and parts of southern Paraguay and Bolivia. They are surrounded by
higher-elevation systems.
40S and include Uruguay, northern, central and eastern Argentina, southern
Brazil, and parts of southern Paraguay and Bolivia. They are surrounded by
higher-elevation systems.
The mid-latitude South American lowlands extend between c. 20 and
40S and include Uruguay, northern, central and eastern Argentina, southern
Brazil, and parts of southern Paraguay and Bolivia. They are surrounded by
higher-elevation systems.
Methods Turnera sidoides is a well-studied polyploid complex of perennial
rhizomatous herbs occurring throughout the area of interest. We analysed
321 individuals from 79 populations of the five recognized subspecies. We also
included progenies from artificial crosses in order to analyse chloroplast
inheritance. After screening sequences for four non-coding chloroplast DNA
rhizomatous herbs occurring throughout the area of interest. We analysed
321 individuals from 79 populations of the five recognized subspecies. We also
included progenies from artificial crosses in order to analyse chloroplast
inheritance. After screening sequences for four non-coding chloroplast DNA
Turnera sidoides is a well-studied polyploid complex of perennial
rhizomatous herbs occurring throughout the area of interest. We analysed
321 individuals from 79 populations of the five recognized subspecies. We also
included progenies from artificial crosses in order to analyse chloroplast
inheritance. After screening sequences for four non-coding chloroplast DNA
4regions, the trntrnF spacer was selected to characterize the collection.regions, the trntrnF spacer was selected to characterize the collection.
5Results Three haplotypes can be easily identified, with each differing from the
others in two independent characters. A clear geographic structure is revealed
when haplotypes are plotted for the complex as a whole regardless of subspecies
and cytotype. Three distinct regions can be identified.
others in two independent characters. A clear geographic structure is revealed
when haplotypes are plotted for the complex as a whole regardless of subspecies
and cytotype. Three distinct regions can be identified.
Results Three haplotypes can be easily identified, with each differing from the
others in two independent characters. A clear geographic structure is revealed
when haplotypes are plotted for the complex as a whole regardless of subspecies
and cytotype. Three distinct regions can be identified.
Main conclusions We propose three putative refugial areas for the Turnera
sidoides complex, which are associated with the orographical systems of the
region. Ravines and slopes in the Haedo Cuchilla system in northern Uruguay,
the elevations of the western side of the area in Argentina, and the eastern
Serraný´as system in south-eastern Uruguay may each have served as refugia in
which the A, B and C haplotypes became fixed during the drier climatic phases.
Biogeographical patterns in the area covered by T. sidoides, particularly east of the
Uruguay River, have not previously been analysed from a historical perspective.
Uruguay River, have not previously been analysed from a historical perspective.
region. Ravines and slopes in the Haedo Cuchilla system in northern Uruguay,
the elevations of the western side of the area in Argentina, and the eastern
Serraný´as system in south-eastern Uruguay may each have served as refugia in
which the A, B and C haplotypes became fixed during the drier climatic phases.
Biogeographical patterns in the area covered by T. sidoides, particularly east of the
Uruguay River, have not previously been analysed from a historical perspective.
Uruguay River, have not previously been analysed from a historical perspective.
sidoides complex, which are associated with the orographical systems of the
region. Ravines and slopes in the Haedo Cuchilla system in northern Uruguay,
the elevations of the western side of the area in Argentina, and the eastern
Serraný´as system in south-eastern Uruguay may each have served as refugia in
which the A, B and C haplotypes became fixed during the drier climatic phases.
Biogeographical patterns in the area covered by T. sidoides, particularly east of the
Uruguay River, have not previously been analysed from a historical perspective.
Uruguay River, have not previously been analysed from a historical perspective.
region. Ravines and slopes in the Haedo Cuchilla system in northern Uruguay,
the elevations of the western side of the area in Argentina, and the eastern
Serraný´as system in south-eastern Uruguay may each have served as refugia in
which the A, B and C haplotypes became fixed during the drier climatic phases.
Biogeographical patterns in the area covered by T. sidoides, particularly east of the
Uruguay River, have not previously been analysed from a historical perspective.
Uruguay River, have not previously been analysed from a historical perspective.
We propose three putative refugial areas for the Turnera
sidoides complex, which are associated with the orographical systems of the
region. Ravines and slopes in the Haedo Cuchilla system in northern Uruguay,
the elevations of the western side of the area in Argentina, and the eastern
Serraný´as system in south-eastern Uruguay may each have served as refugia in
which the A, B and C haplotypes became fixed during the drier climatic phases.
Biogeographical patterns in the area covered by T. sidoides, particularly east of the
Uruguay River, have not previously been analysed from a historical perspective.
Uruguay River, have not previously been analysed from a historical perspective.
region. Ravines and slopes in the Haedo Cuchilla system in northern Uruguay,
the elevations of the western side of the area in Argentina, and the eastern
Serraný´as system in south-eastern Uruguay may each have served as refugia in
which the A, B and C haplotypes became fixed during the drier climatic phases.
Biogeographical patterns in the area covered by T. sidoides, particularly east of the
Uruguay River, have not previously been analysed from a historical perspective.
Uruguay River, have not previously been analysed from a historical perspective.
complex, which are associated with the orographical systems of the
region. Ravines and slopes in the Haedo Cuchilla system in northern Uruguay,
the elevations of the western side of the area in Argentina, and the eastern
Serraný´as system in south-eastern Uruguay may each have served as refugia in
which the A, B and C haplotypes became fixed during the drier climatic phases.
Biogeographical patterns in the area covered by T. sidoides, particularly east of the
Uruguay River, have not previously been analysed from a historical perspective.
Uruguay River, have not previously been analysed from a historical perspective.
T. sidoides, particularly east of the
Uruguay River, have not previously been analysed from a historical perspective.