| Abstract Detail
Integrative Plant Physiology Boggs, Julian [1], Bibee, Katherine [1], Heschel, Shane [2]. Interactions between drought responses and phytochrome pathways. Drought sensing and response are crucial to optimizing fitness in weedy annuals. To further understand the pathways that mediate drought-response plasticity we examined interactions between phytochrome and drought stress with Arabidopsis thaliana. Previous studies have suggested that phytochrome may mediate germination pathways through abscisic acid, linking the light-sensing hormone to drought response. Phytochrome mutants were grown under moist and dry soil conditions in Percival chambers. Phytochromes A, B, and E influenced stomatal conductance of drought-stressed plants in a web of inhibition and promotion. It is clear that the three phytochromes are present in drought-response pathways and loss of phytochrome function can have a pronounced effect on the strength of drought response in A. thaliana. Phytochrome-mediated pathways reduce aboveground biomass in moist conditions and increase aboveground biomass in drought conditions, indicating that phytochrome may mediate drought-avoidance strategies. PHYE may actually confer negative fitness under drought stress but evolutionarily the gene was conserved, likely due to its importance to germination under cold conditions. Log in to add this item to your schedule
1 - Colorado College, Biology 2 - Colorado College, Biology, 14 E. Cache La Poudre St., Colorado Springs, CO, 80903, USA
Keywords: Phytochrome drought stress.
Presentation Type: Plant Biology Abstract Session: P Location: Exhibit Hall (Northeast, Southwest & Southeast)/Hilton Date: Sunday, July 8th, 2007 Time: 8:00 AM Number: P04007 Abstract ID:753 |