title: Indole acetic acid and its metabolism in root nodules of a monocotyledonous tree Roystonea regia.
abstract: A monocotyledonous tree, Roystonea regia, was found to bear root nodules. The root nodules contained a high amount (16.9 microg/g fresh mass) of indole acetic acid (IAA). A big tryptophan pool (1555.1 microg/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.
authors.affiliation: Department of Botany, Burdwan University, Golapbag, Burdwan 713104, West Bengal, India.
authors.forename: P S
authors.initials: PS
authors.lastname: Basu
authors.forename: A C
authors.initials: AC
authors.lastname: Ghosh
mesh_terms: D004156:Catechol Oxidase / Q000378:metabolism; D002455:Cell Division / Q000502:physiology; D018548:Cotyledon / Q000737:chemistry* / Q000201:enzymology / Q000382:microbiology; D007210:Indoleacetic Acids / Q000378:metabolism*; D009195:Peroxidase / Q000378:metabolism; D010544:Peroxidases / Q000378:metabolism; D010636:Phenols / Q000378:metabolism; D018517:Plant Roots / Q000737:chemistry* / Q000382:microbiology / Q000648:ultrastructure; D012231:Rhizobium / Q000166:cytology / Q000378:metabolism / Q000648:ultrastructure; D014197:Trees / Q000737:chemistry* / Q000201:enzymology / Q000382:microbiology; D014364:Tryptophan / Q000378:metabolism
chemical_list: D007210:Indoleacetic Acids; D010636:Phenols; C030737:indoleacetic acid; D014364:Tryptophan; D004156:Catechol Oxidase; C027929:indoleacetic acid oxidase; D010544:Peroxidases; D009195:Peroxidase