ibclogo XVI International Botanical Congess


Abstract Number: 3690
Session = 3.17.3


INTRACELLULAR O2 REGULATION IN NODULES AND OTHER PLANT ORGANS


D.B. Layzell (Dept Biol., Queen's U, Kingston, ON K7L 3N6 Canada).


In N2 fixing legume nodules, the infected cell [O2] is very low (<50 nM)compared to cells in equilibrium with air (250 uM). Moreover, the nodule regulates [O2] to control C metabolism and N2 fixation in response to short term changes in environmental or physiological conditions. I will summarize our current understanding of how [O2] is regulated and how this affects the C and N metabolism in the plant and bacteroid compartments of the infected cell. But is intracellular O2 regulation limited to legume nodules? Do other plant tissues have a very low intracellular [O2] and if so, is it regulated in response to short term perturbations? What role might O2 regulation play in these tissues? Lowering free radicals or modifying ATP/ATP? Enhancing reductive biosynthesis? Results from preliminary studies to address these questions will be presente


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