IFEVA   02662
INSTITUTO DE INVESTIGACIONES FISIOLOGICAS Y ECOLOGICAS VINCULADAS A LA AGRICULTURA
Unidad Ejecutora - UE
congresos y reuniones científicas
Título:
Genome-Wide Expression Profiling of Potato And Tobacco Plants Exposed to Contrasting Photoperiodic Conditions
Autor/es:
RUTITZKY, M. AND YANOVSKY, M.J.
Lugar:
Boston, Massachusetts, EE.UU.
Reunión:
Congreso; ASPB and CSPP Annual Meeting; 2006
Institución organizadora:
ASPB and CSPP
Resumen:
Most
organisms adjust critical developmental processes to occur at times of the year
that maximize their chances of survival and reproductive success. In 1920,
Garner and Allard discovered that the onset of flowering in many species is
triggered by changes in daylenght, an environmental cue associated with
seasonal progression. Changes
in photoperiod also trigger several other responses that help plants to cope
with seasonal changes in the environment. These include bud dormancy, cold
hardiness, the formation of tubers and bulbs, among others. Here
we investigated global changes in gene expression associated with the ability of different solanaceae to adjust their
physiology and development in anticipation of seasonal changes. First, we identified genes whose expression changed in the
leaves of potato plants that tuberize only in short-days (SD), when these plants were grown under non-inductive long-day (LD)
conditions and were transferred to inductive SD conditions. Second, we compared
changes in gene expression to contrasting photoperiodic conditions in Nicotiana
biotypes that flower either in SD, LD or irrespective of photoperiod. This
allowed us to identify genes potentially involved in the regulation of the
floral transition. Finally, by comparing
responses to photoperiod in potato and tobacco we were able to identify changes
in gene expression that mediate general biochemical, physiological and
developmental adaptations. We also documented changes
that are species-specific, which may be associated with the control of
processes that take place only in particular species, such as tuberization in
potato. Interestingly, we identified some well known regulatory transcription
factors that regulate flowering in Arabidopsis that might be involved in
tuberization and flowering processes in Solanum and Nicotiana as
well. A thorough description of microarray data and ints implications will be presented at the meeting.