کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
2036135 | 1072246 | 2011 | 13 صفحه PDF | دانلود رایگان |

SummaryPhytochrome A (phyA) is the only photoreceptor in plants, initiating responses in far-red light and, as such, essential for survival in canopy shade. Although the absorption and the ratio of active versus total phyA are maximal in red light, far-red light is the most efficient trigger of phyA-dependent responses. Using a joint experimental-theoretical approach, we unravel the mechanism underlying this shift of the phyA action peak from red to far-red light and show that it relies on specific molecular interactions rather than on intrinsic changes to phyA's spectral properties. According to our model, the dissociation rate of the phyA-FHY1/FHL nuclear import complex is a principle determinant of the phyA action peak. The findings suggest how higher plants acquired the ability to sense far-red light from an ancestral photoreceptor tuned to respond to red light.
Graphical AbstractFigure optionsDownload high-quality image (337 K)Download as PowerPoint slideHighlights
► Constitutively active phyA does not accumulate in the nucleus
► Cycling between the active and inactive state is essential for phyA signaling
► PhyA degradation is important for shifting responsiveness toward FR
► Response to FR requires coupling between two antagonistic photoconversion cycles
Journal: - Volume 146, Issue 5, 2 September 2011, Pages 813–825