DOI | Resolve DOI: https://doi.org/10.1139/m81-160 |
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Author | Search for: Nelson, Louise M.1; Search for: Child, J. J.1 |
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Affiliation | - National Research Council of Canada. Prairie Regional Laboratory
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Format | Text, Article |
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Abstract | A survey of 108 isolates of Rhizobium leguminosarum was conducted to determine the variation in H₂ uptake and relative efficiency of N₂ fixation in Pisum sativum L. root nodules and the relation of relative efficiency to plant dry weight and N content. Only 14 of the isolates exhibited significant uptake hydrogenase activity and none of these had sufficient hydrogenase activity to recycle all of the H₂ produced by nitrogenase. In 74 of the isolates tested relative efficiencies of N₂ fixation were less than 0.60.Twenty-nine of the isolates were ineffective, since total plant N at harvest did not differ significantly from uninoculated controls. The remaining 79 effective isolates could be divided into low-and high-efficiency groups. Plants which were inoculated with isolates from the two groups and harvested after 4 weeks did not differ significantly in plant dry weight or N content. Among the isolates with high relative efficiency of N₂ fixation, two groups could be recognized: one possessing significant uptake hydrogenase activity, the other lacking hydrogenase activity but in which H₂ evolution was low. Although the two groups did not differ with respect to plant dry weight or N content, the identification of this latter group may be of some significance for optimizing the efficiency of N₂ fixation. |
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Publication date | 1981-10-01 |
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Publisher | Canadian Science Publishing |
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In | |
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Language | English |
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Peer reviewed | Yes |
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Identifier | NRCC-19296 |
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Export citation | Export as RIS |
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Report a correction | Report a correction (opens in a new tab) |
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Record identifier | 189aea0f-2e3a-4279-bf0b-9764260cd588 |
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Record created | 2023-09-11 |
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Record modified | 2023-09-11 |
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