INVESTIGADORES
LUQUEZ Virginia Martha Cristina
congresos y reuniones científicas
Título:
Natural variation in Aspen (Populus tremula): the Swedish Aspen Collection.
Autor/es:
LUQUEZ VIRGINIA; HALL DAVID; ALBRECTSEN BENEDICTE; GARCÍA M VICTORIA; INGVARSSON PÄR; JANSSON STEFAN
Reunión:
Conferencia; Third EPSO Conference; 2006
Resumen:
Aspen
is currently established as the main model system for genetic, genomic and
physiological research in trees. Swedish Aspen (Populus tremula)
grows in different environments across Sweden
showing phenotypic variation in different traits that is expected to reflect
the genetic variation that is important for local adaptation. To analyze the
natural phenotypic and genetic variation the Swedish Aspen Collection (SwAsp)
was established. Trees were taken from 12 different populations across Sweden,
from 56° to 66° NL and planted in two common gardens, and also kept in pots in
the greenhouse. We have collected phenotypic data for e g growth, phenology,
herbivory, pathogens etc. Some traits like bud set showed a strong clinal
variation pattern along latitude, in both the field trials and the greenhouse.
Leaf abscission and growth measurements displayed also clinal variation, but
bud flush did not change along a latitudinal cline. We have also genotyped the
collection using neutral markers and found that there is no population
substructure. We have used association mapping to find mutations in the phyB2
gene that describes about 10 % of the variation in timing of bud set, and are
also scoring other candidate genes for phenology.