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Annals of Botany 78: 255-266, 1996
© 1996 Annals of Botany Company

Exogenous Auxin Effects on Lateral Bud Outgrowth in Decapitated Shoots

MORRIS G. CLINE

The Ohio State University, Department of Plant Biology, Columbus, Ohio, 43210, U.S.A.

July 5, 1995 ; March 11, 1996

In 1933 Thimann and Skoog demonstrated exogenous auxin repression of lateral bud outgrowth in decapitated shoots ofVicia faba . This evidence has given strong support for a role of auxin in apical dominance. Most, but not all, investigators have confirmed Thimann and Skoog's results. In the present study, auxin treatments were carried out on ten different species or plant types, many of which were treated with auxin in different forms, media and under different light conditions. The Thimann–Skoog experiment did work for most species (i.e. exogenous auxin did repress bud outgrowth) including thedgt tomato mutant which is known to be insensitive to auxin in certain responses. Toxic auxin symptoms were observed in some but not all species. The Thimann–Skoog experiment did not work for greenhouse-grownColeus or forArabidopsis . Light was shown to reduce apical dominance inColeus andIpomoea nil .

apical dominance; lateral bud outgrowth; axillary bud; auxin; IAA; decapitation; Vicia faba ; Ipomoea nil ; Pisum sativum ; Phaseolus vulgaris ; Lycopersion exculentum ; dgt ; Coleus blumei ; Arabidopsis thaliana ; Helianthus annuus ; Thimann–Skoog


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