Improvement of photosynthetic organisms through the modulation of guanosine tetraphosphate homeostatis
AssigneesCentre National de la Recherche Scientifique (CNRS), Universite De La Mediterranee Aix-Marseille II
InventorsBenjamin FIELD, Matteo SUGLIANI, Christophe ROBAGLIA, Hela ABDELKEFI
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Abstract
The present invention concerns methods and approaches for modifying guanosine tetraphosphate (ppGpp) homeostasis in photosynthetic eukaryotes, in particular plants or algae, in order to modulate senescence for the remobilisation of nitrogen and other nutrients from the chloroplast, and modified photosynthetic eukaryotes thus produced.
Claims16
A modified photosynthetic eukaryote having a modified level of guanosine tetraphosphate (ppGpp) capable of altering nitrogen remobilization and/or causing senescence in a photosynthetic eukaryote, compared to that of a non-modified photosynthetic eukaryote, wherein said modified photosynthetic eukaryote displays a delayed or accelerated nitrogen remobilization and/or senescence relative to a non-modified photosynthetic eukaryote.
A seed with modified senescence characteristics, wherein said seed is transformed with a nucleic acid molecule effective in increasing expression of ppGpp.
A method for producing a photosynthetic eukaryote with modified nitrogen remobilization and/or senescence characteristics which comprises transformation of a photosynthetic eukaryote with a DNA construct adapted to modify ppGpp homeostatis, and subsequent selection of the modified photosynthetic eukaryote in which the senescence is either delayed or accelerated.
Dependencies are inferred from the claim text.