Plant and Soil

, Volume 116, Issue 1, pp 129–131 | Cite as

Partitioning of biologically fixed nitrogen in cowpea during pod development

  • L. A. Douglas
  • R. W. Weaver
Short Communications


Two days after exposure of roots to15N labeled N2, partitioning of biologically fixed N into leaves, stems, peduncles, pods, roots and nodules was measured in the early pod development stage of cowpea (Vigna unguiculata (L.). The experimental objective was to determine the quantity of biologically fixed N that is incorporated into vegetative tissue before being mobilized to pods. For the three varieties of cowpea included in the experiment a maximum of 50% of the N, biologically fixed two days earlier, was contained in the pods. The remaining N was distributed throughout the vegetative portion of the plant with at least 30% in stems and leaves which indicates that much of the newly fixed N must cycle through a N pool in these tissues before reaching the pods.

Key words

15nitrogen fixation nitrogen partitioning translocationVigna unguiculata 


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  1. Douglas L A and Weaver R W 1986 Agron. J. 78, 499–502.Google Scholar
  2. Kvien C S et al. 1986 Agron. J. 78, 954–958.Google Scholar
  3. Morris D R and Weaver R W 1983 Crop Science 23, 1111–1114.Google Scholar
  4. Nelson D A and Sommers L E 1973 Agron. J. 65, 109–112.Google Scholar
  5. Pate J S et al. 1985 Plant Physiol. 77, 148–156.Google Scholar
  6. Peoples M B et al. 1983 J. Expt. Bot. 34, 563–578.Google Scholar
  7. Peoples M B et al. 1985a J. Expt Bot. 36, 567–582.Google Scholar
  8. Peoples M B et al. 1985b Plant Physiol. 77, 142–147.Google Scholar
  9. Porter L K and O’Dean W A 1977 Anal. Chem. 49, 514–516.CrossRefGoogle Scholar
  10. Weaver R W 1975 Soil Biol. Biochem. 7, 77–78.CrossRefGoogle Scholar
  11. Weaver R W and Miller J C Jr 1986 Plant and Soil 94, 147–151.Google Scholar
  12. Weaver R W and Frederick L R 1982In Methods of Soil Analysis, Part 2. Ed. A L Page Chemical and Microbiological Properties. American Soc. Agron., Inc., Madison, WI.Google Scholar

Copyright information

© Kluwer Academic Publishers 1989

Authors and Affiliations

  • L. A. Douglas
    • 1
    • 2
  • R. W. Weaver
    • 1
    • 2
  1. 1.School of Agric. and ForestryUniv. MelbourneParkvilleAustralia
  2. 2.Soil and Crop Sciences Dept., The Texas Agric. Expt. StationTexas A&M Univ.College StationUSA

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