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Journal of Plant Growth Regulation

, Volume 6, Issue 2, pp 97–111 | Cite as

Phytohormones,Rhizobium mutants, and nodulation in legumes. VII. Identification and quantification of cytokinins in effective and ineffective pea root nodules using radioimmunoassay

  • Jane Badenoch-Jones
  • Charles W. Parker
  • D. S. Letham
Article

Abstract

Radioimmunoassays (RIA), employing antisera raised in rabbits against bovine serum albumin conjugates of zeatin riboside, dihydrozeatin riboside, and isopentenyladenosine, were used to estimate levels of these cytokinins and their corresponding bases in samples of effective (nitrogen-fixing, Fix+), ineffective (nonnitrogen-fixing, Fix) pea root nodules and uninoculated roots. Assays were done on extracts of nodule tissue, 1–2 g fresh weight, or approximately 10 g fresh weight of root tissue, and high specific activity [3H]zeatin riboside was added during preparation of the extract for use as a recovery marker. Two different purification procedures were employed, each involving several purification steps. High performance liquid chromatography (HPLC) was the final step in both procedures. Fractions from HPLC were analyzed by RIA using the appropriate antiserum. The cytokinins, zeatin, zeatin riboside, dihydrozeatin riboside, isopentenyl adenine, and isopentenyladenosine were detected and quantified in nodule tissue, and similarly, in root tissue (with the exception of zeatin, which we were unable to quantify in root tissue). Cytokinin levels in nodule tissue were higher than those in root tissue. The major cytokinins detected in nodule tissue were zeatin, followed by zeatin riboside and then dihydrozeatin riboside. The levels of zeatin and zeatin riboside estimated in nodules in the present study by RIA were of the same order of magnitude, though tending to be a little higher, than values obtained previously by bioassay. Dihydrozeatin riboside was identified with confidence for the first time in nodule tissue. There was a general decline with age in cytokinin levels in nodules, but no major qualitative change in nodule cytokinins with age. For theRhizobium strains examined, the data did not indicate a clear correlation between nodule cytokinin levels and the effectiveness of nodules in nitrogen fixation.

Keywords

High Performance Liquid Chromatography Root Tissue Zeatin High Specific Activity Isopentenyl 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer-Verlag New York Inc 1987

Authors and Affiliations

  • Jane Badenoch-Jones
    • 1
  • Charles W. Parker
    • 1
  • D. S. Letham
    • 1
  1. 1.Research School of Biological SciencesAustralian National UniversityCanberra CityAustralia

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