TY - JOUR
T1 - Fold-change Response of Photosynthesis to Step Increases of Light Level
AU - Tendler, Avichai
AU - Wolf, Bat Chen
AU - Tiwari, Vivekanand
AU - Alon, Uri
AU - Danon, Avihai
N1 - We thank members of our labs for discussions. This study was supported by grants from the Israeli Science Foundation. The David and Fela Shapell Family Foundation at the Weizmann Institute of Science. AD is incumbent of The Henry and Bertha Benson Chair, and UA is incumbent of the Abisch-Frenkel Professorial Chair, Weizmann Institute of Science.
PY - 2018/10/26
Y1 - 2018/10/26
N2 - Plants experience light intensity over several orders of magnitude. High light is stressful, and plants have several protective feedback mechanisms against this stress. Here we asked how plants respond to sudden rises at low ambient light, far below stressful levels. For this, we studied the fluorescence of excited chlorophyll a of photosystem II in Arabidopsis thaliana plants in response to step increases in light level at different background illuminations. We found a response at low-medium light with characteristics of a sensory system: fold-change detection (FCD), Weber law, and exact adaptation, in which the response depends only on relative, and not absolute, light changes. We tested various FCD circuits and provide evidence for an incoherent feedforward mechanism upstream of known stress response feedback loops. These findings suggest that plant photosynthesis may have a sensory modality for low light background that responds early to small light increases, to prepare for damaging high light levels.
AB - Plants experience light intensity over several orders of magnitude. High light is stressful, and plants have several protective feedback mechanisms against this stress. Here we asked how plants respond to sudden rises at low ambient light, far below stressful levels. For this, we studied the fluorescence of excited chlorophyll a of photosystem II in Arabidopsis thaliana plants in response to step increases in light level at different background illuminations. We found a response at low-medium light with characteristics of a sensory system: fold-change detection (FCD), Weber law, and exact adaptation, in which the response depends only on relative, and not absolute, light changes. We tested various FCD circuits and provide evidence for an incoherent feedforward mechanism upstream of known stress response feedback loops. These findings suggest that plant photosynthesis may have a sensory modality for low light background that responds early to small light increases, to prepare for damaging high light levels.
U2 - https://doi.org/10.1016/j.isci.2018.09.019
DO - https://doi.org/10.1016/j.isci.2018.09.019
M3 - مقالة
SN - 2589-0042
VL - 8
SP - 126
EP - 137
JO - iScience
JF - iScience
ER -