Article (Scientific journals)
Involvement of indole-3-acetic acid in the circadian growth of the first internode of Arabidopsis
Jouve, Laurent; Gaspar, Thomas; Kevers, Claire et al.
1999In Planta, 209 (1), p. 136-142
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Keywords :
auxin; auxin transport; circadian rhythm; floral stem growth; indole-3-acetic acid aspartate; Arabidopsis
Abstract :
[en] The extension rate of the first inflorescence node of Arabidopsis was measured during light/dark or continuous light exposure and was found to exhibit oscillations which showed a circadian rhythmicity. Decapitation induced a strong inhibition of stem extension. Subsequent application of IAA restored growth and the associated extension-rate oscillations. In addition, IAA treatments, after decapitation, re-established the circadian rhythmicity visible in the intact plants during free run. This indicates that the upper zone of the inflorescence has a major influence on the extension rate of floral stems and implies a role for auxin. Application of N-(1-naphthyl)phthalamic acid, an IAA transport inhibitor, to an intact floral stem inhibited growth and the rhythmicity in the extension rate oscillations, indicating that IAA polar transport may play a role in the dynamics of stem elongation. Furthermore, IAA-aspartate application, after decapitation, did not restore growth and rhythmicity. Nevertheless, biochemical analysis of IAA and IAA-aspartate demonstrated circadian fluctuations of the endogenous levels of both compounds. These observations suggest that IAA metabolism is an essential factor in the regulation of the circadian growth rhythm of Arabidopsis floral stems.
Disciplines :
Phytobiology (plant sciences, forestry, mycology...)
Author, co-author :
Jouve, Laurent;  Université de Genève - UNIGE > Biochimie et physiologie végétales
Gaspar, Thomas ;  Botanique, radiobotanique & serres expér.
Kevers, Claire ;  Université de Liège - ULiège > Département des sciences de la vie > Biologie moléculaire et biotechnologie végétales
Greppin, Hubert;  Université de Genève - UNIGE > Biochimie et physiologie végétales
Agosti, Robert;  Université de Genève - UNIGE > Biochimie et physiologie végétales
Language :
English
Title :
Involvement of indole-3-acetic acid in the circadian growth of the first internode of Arabidopsis
Publication date :
1999
Journal title :
Planta
ISSN :
0032-0935
eISSN :
1432-2048
Publisher :
Springer Science & Business Media B.V., New York, United States - New York
Volume :
209
Issue :
1
Pages :
136-142
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 03 January 2009

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