Auxin metabolism in mosses and liverworts

The plant hormone auxin (indole-3-acetic acid, IAA) is involved in the control of many phenomena during plant development. By characterizing steady-state free and conjugated IAA levels using a stable isotope dilution method coupled with gas chromatography- selected ion monitoring- mass spectrometry,...

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Bibliographic Details
Published in:American journal of botany 1999-11, Vol.86 (11), p.1544-1555
Main Authors: Ester Sztein, A, Cohen, Jerry D, de la Fuente, Ines Garcia, Cooke, Todd J
Format: Article
Language:English
Subjects:
Amides
auxin
auxin conjugates
auxin metabolism
Auxins
Botany
Esters
Flowers & plants
indole‐3‐acetic acid
Insulin antibodies
Liverworts
Metabolism
Mosses
Physiology and Development
Plants
Thallus
tracheophytes
Vascular plants
vascular tissue
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Summary:The plant hormone auxin (indole-3-acetic acid, IAA) is involved in the control of many phenomena during plant development. By characterizing steady-state free and conjugated IAA levels using a stable isotope dilution method coupled with gas chromatography- selected ion monitoring- mass spectrometry, this paper provides a detailed characterization of IAA metabolism in five liverworts, four mosses, and two tracheophytes. Long-term IAA conjugation patterns were monitored by incubating actively growing tissue with14C-IAA and then analyzing the de novo synthesis of IAA conjugates with radioimaging techniques. The liverworts, mosses, and tracheophytes can be differentiated by the total amount of IAA metabolites, the proportion of free and conjugated IAA, the chemical nature of their IAA conjugates, and the rates of IAA conjugation. Our tentative conclusion is that the liverworts appear to employ a biosynthesis-degradation strategy for the regulation of free IAA levels, in contrast to the conjugation-hydrolysis strategy apparently used by the mosses and tracheophytes. Such alternative metabolic strategies may have profound implications for macroevolutionary processes in these plant groups.
ISSN:0002-9122
1537-2197
DOI:10.2307/2656792