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Impact Of Carbon And Phosphate Starvation On Growth And Programmed Cell Death Of Maritime Pine Suspension Cells
H. Azevedo, P. H. Castro, J. Gonçalves, T. Lino-Neto, R. Tavares
Published 2014 · Biology
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Programmed cell death is a fundamental aspect of plant development and defense. In suspension cultures of maritime pine (Pinus pinaster Ait.), cell death was associated with the simultaneous depletion of sugar and phosphate. This present work suggests that sugar rather than phosphate deprivation induced programmed cell death events, including degradation of nuclear DNA and remobilization of phosphate. However, phosphate starvation may have a synergistic effect on programmed cell death mediated by the lack of carbon source. Sugar and phosphate analogs were used to evaluate the nature of signaling events, and results suggested that programmed cell death induction by sugar starvation occurs downstream of hexokinase-based sugar sensing mechanisms, and that the synergistic effect of lack of phosphate is independent of phosphate sensing.
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