Current Microbiology

, Volume 37, Issue 2, pp 137–140 | Cite as

News & Notes Indole Acetic Acid and Its Metabolism in Root Nodules of a Monocotyledonous Tree Roystonea regia

  • Priti S.  Basu
  • Atish C.  Ghosh

Abstract.

A monocotyledonous tree, Roystonea regia, was found to bear root nodules. The root nodules contained a high amount (16.9 μg/g fresh mass) of indole acetic acid (IAA). A big tryptophan pool (1555.1 μg/g fresh mass) was found in the root nodules, which might serve as a source of IAA production. The presence of IAA-metabolizing enzymes IAA oxidase and peroxidase indicated metabolism of IAA in the root nodules. The symbiont isolated from the root nodules of R. regia, a Rhizobium sp., produced high amount of IAA in culture when supplemented with tryptophan. The possible role of this IAA production in the monocotyledonous tree–Rhizobium symbiosis is discussed.

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Copyright information

© Springer-Verlag New York Inc. 1998

Authors and Affiliations

  • Priti S.  Basu
    • 1
  • Atish C.  Ghosh
    • 1
  1. 1.Department of Botany, Burdwan University, Golapbag, Burdwan 713104, West Bengal, India IN

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