Document Detail

Measurement of the rates of oxindole-3-acetic acid turnover, and indole-3-acetic acid oxidation in Zea mays seedlings.
MedLine Citation:
PMID:  11539687     Owner:  NASA     Status:  MEDLINE    
Oxindole-3-acetic acid is the principal catabolite of indole-3-acetic acid in Zea mays seedlings. In this paper measurements of the turnover of oxindole-3-acetic acid are presented and used to calculate the rate of indole-3-acetic acid oxidation. [3H]Oxindole-3-acetic acid was applied to the endosperm of Zea mays seedlings and allowed to equilibrate for 24 h before the start of the experiment. The subsequent decrease in its specific activity was used to calculate the turnover rate. The average half-life of oxindole-3-acetic acid in the shoots was found to be 30 h while that in the kernels had an average half-life of 35h. Using previously published values of the pool sizes of oxindole-3-acetic acid in shoots and kernels from seedlings of the same age and variety, and grown under the same conditions, the rate of indole-3-acetic acid oxidation was calculated to be 1.1 pmol plant-1 h-1 in the shoots and 7.1 pmol plant-1 h-1 in the kernels.
H M Nonhebel
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Publication Detail:
Type:  Journal Article; Research Support, U.S. Gov't, Non-P.H.S.    
Journal Detail:
Title:  Journal of experimental botany     Volume:  37     ISSN:  0022-0957     ISO Abbreviation:  J. Exp. Bot.     Publication Date:  1986 Nov 
Date Detail:
Created Date:  1997-10-10     Completed Date:  1997-10-10     Revised Date:  2007-11-14    
Medline Journal Info:
Nlm Unique ID:  9882906     Medline TA:  J Exp Bot     Country:  ENGLAND    
Other Details:
Languages:  eng     Pagination:  1691-7     Citation Subset:  S    
Department of Botany and Plant Pathology, Michigan State University, East Lansing 48824, USA.
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MeSH Terms
Indoleacetic Acids / metabolism*
Plant Growth Regulators / metabolism*
Plant Shoots / metabolism
Time Factors
Zea mays / metabolism*
Grant Support
Reg. No./Substance:
0/Indoleacetic Acids; 0/Plant Growth Regulators; 2971-31-5/2-oxindole-3-acetic acid; 87-51-4/indoleacetic acid
R S Bandurski / MI St U, E Lansing

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