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- W2247286799 abstract "Growth of Alnus incana ssp. rugosa plants with root systems at Po 2 levels of 5, 21, and 40 kPa showed no significant differences among treatments over a 6-week period. Nitrogenase activity of attached nodulated foot systems run in an opencuvette continuous-flow system generally was responsive to Po 2 over a broad range around the optimum. Plants expressed acetylene-induced and oxygen-induced transient declines in nitrogenase activity, from which they spontaneously recovered. Nitrogenase activity was seldom stable at any one Po 2 during assay with apparent adaptation to both above- and below-ambient Po 2 Nodule morphology showed quantitative decreases in aeration pathways as ambient Po 2 was increased, with air spaces in the cortex and infected tissue being significantly affected. The major change in response to Po 2 was the change in vesicle structure. Vesicles from nodules at low Po 2 showed a vanishingly thin vesicle envelope under dark-field microscopy, while at high Po 2 vesicles appeared very bright and apparently thickened. The results suggest that the major barrier to O 2 diffusion in Alnus nodules is the vesicle envelope of the bacterium." @default.
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- W2247286799 date "1988-09-01" @default.
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- W2247286799 title "Adaptation of nitrogenase to varying oxygen tension and the role of the vesicle in root nodules of <i>Alnus incana</i> ssp. <i>rugosa</i>" @default.
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- W2247286799 doi "https://doi.org/10.1139/b88-243" @default.
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