Phloem import and storage metabolism are highly coordinated by the low oxygen concentrations within developing wheat seeds

Plant Physiology
Joost T van DongenPeter Geigenberger

Abstract

We studied the influence of the internal oxygen concentration in seeds of wheat (Triticum aestivum) on storage metabolism and its relation to phloem import of nutrients. Wheat seeds that were developing at ambient oxygen (21%) were found to be hypoxic (2.1%). Altering the oxygen supply by decreasing or increasing the external oxygen concentration induced parallel changes in the internal oxygen tension. However, the decrease in internal concentration was proportionally less than the reduction in external oxygen. This indicates that decreasing the oxygen supply induces short-term adaptive responses to reduce oxygen consumption of the seeds. When external oxygen was decreased to 8%, internal oxygen decreased to approximately 0.5% leading to a decrease in energy production via respiration. Conversely, increasing the external oxygen concentration above ambient levels increased the oxygen content as well as the energy status of the seeds, indicating that under normal conditions the oxygen supply is strongly limiting for energy metabolism in developing wheat seeds. The intermediate metabolites of seed storage metabolism were not substantially affected when oxygen was either increased or decreased. However, at subambient external oxyge...Continue Reading

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Citations

Jun 14, 2013·Journal of Agricultural and Food Chemistry·Bartosz KazłowskiYuan-Tih Ko
Mar 8, 2012·Journal of Proteome Research·Ayesha Tasleem-TahirGérard Branlard
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