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New Phytol. 2015 Jan;205(2):707-19. doi: 10.1111/nph.13044. Epub 2014 Sep 25.

Adjustments of embryonic photosynthetic activity modulate seed fitness in Arabidopsis thaliana.

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Laboratoire de Physiologie Cellulaire & Végétale, Unité Mixte de Recherche 5168, Centre National de la Recherche Scientifique, F-38054, Grenoble, France; Université Grenoble-Alpes, F-38054, Grenoble, France; Commissariat à l'Energie Atomique et Energies Alternatives, Institut de Recherches en Technologies et Sciences pour le Vivant, F-38054, Grenoble, France; Unité Sous Contrat 1359, Institut National Recherche Agronomique, F-38054, Grenoble, France.


In this work, we dissect the physiological role of the transient photosynthetic stage observed in developing seeds of Arabidopsis thaliana. By combining biochemical and biophysical approaches, we demonstrate that despite similar features of the photosynthetic apparatus, light absorption, chloroplast morphology and electron transport are modified in green developing seeds, as a possible response to the peculiar light environment experienced by them as a result of sunlight filtration by the pericarp. In particular, enhanced exposure to far-red light, which mainly excites photosystem I, largely enhances cyclic electron flow around this complex at the expenses of oxygen evolution. Using pharmacological, genetic and metabolic analyses, we show that both linear and cyclic electron flows are important during seed formation for proper germination timing. Linear flow provides specific metabolites related to oxygen and water stress responses. Cyclic electron flow possibly adjusts the ATP to NADPH ratio to cope with the specific energy demand of developing seeds. By providing a comprehensive scenario of the characteristics, function and consequences of embryonic photosynthesis on seed vigour, our data provide a rationale for the transient building up of a photosynthetic machinery in seeds.


Arabidopsis thaliana; cyclic electron flow; development; embryo; germination; photosynthesis; seed

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