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Evidence of a key role for photosynthetic oxygen release in oil storage in developing soybean seeds

Evidence of a key role for photosynthetic oxygen release in oil storage in developing soybean seeds

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ROLLETSCHEK, Hardy, Ruslana RADCHUK, Christian KLUKAS, Falk SCHREIBER, Ulrich WOBUS, Ljudmilla BORISJUK, 2005. Evidence of a key role for photosynthetic oxygen release in oil storage in developing soybean seeds. In: New phytologist. 167(3), pp. 777-786. ISSN 0028-646X. eISSN 1469-8137. Available under: doi: 10.1111/j.1469-8137.2005.01473.x

@article{Rolletschek2005-09Evide-40342, title={Evidence of a key role for photosynthetic oxygen release in oil storage in developing soybean seeds}, year={2005}, doi={10.1111/j.1469-8137.2005.01473.x}, number={3}, volume={167}, issn={0028-646X}, journal={New phytologist}, pages={777--786}, author={Rolletschek, Hardy and Radchuk, Ruslana and Klukas, Christian and Schreiber, Falk and Wobus, Ulrich and Borisjuk, Ljudmilla} }

Schreiber, Falk Borisjuk, Ljudmilla Radchuk, Ruslana 2017-10-16T08:23:21Z Borisjuk, Ljudmilla Wobus, Ulrich Radchuk, Ruslana Evidence of a key role for photosynthetic oxygen release in oil storage in developing soybean seeds 2017-10-16T08:23:21Z Wobus, Ulrich eng Rolletschek, Hardy Based on the topographical analysis of photosynthesis and oil storage, we propose in a companion paper that photosynthetic oxygen release plays a key role in the local energy state, storage metabolism and flux toward lipid biosynthesis in developing soybean seeds. To test this hypothesis, we combined topographical analysis of ATP gradients across tissues, microsensor quantifications of internal O <sub>2</sub> levels, assays of energy balance, metabolite profiles and isotope-labelling studies.<br />Seeds show a marked degree of oxygen starvation in vivo (minimum O<sub> 2</sub> levels 0.1 kPa, ≈ 1.3 μ M ), affecting ATP gradients, overall energy state, metabolite pools and storage activity.<br />Despite the low light availability, photosynthesis supplies significant amounts of oxygen to the hypoxic seed tissue. This is followed by an increase in local ATP levels, most prominently within the lipid-synthesizing (inner) regions of the embryo. Concomitantly, partitioning of <sup>14</sup> C-sucrose to lipids is increased, suggesting higher rates of lipid biosynthesis.<br />It is concluded that both respiratory and biosynthetic fluxes are dynamically adjusted to photosynthetic oxygen supply. Rolletschek, Hardy Klukas, Christian Schreiber, Falk 2005-09 Klukas, Christian

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