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.