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Tomato Aux/IAA3 and HOOKLESS are important actors of the interplay between auxin and ethylene during apical hook formation

Chaabouni, Salma and Latché, Alain and Pech, Jean-Claude and Bouzayen, Mondher Tomato Aux/IAA3 and HOOKLESS are important actors of the interplay between auxin and ethylene during apical hook formation. (2009) Plant Signaling & Behavior, vol.4 (n°6). pp. 559-560. ISSN 1559-2316

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Official URL: http://dx.doi.org/10.4161/psb.4.6.8748

Abstract

Plants implement differential cell growth as an adaptation process in order to direct their development in a way that allow them to better cope with the environmental conditions. This process requires the complex integration of multiple hormone signalings, though, a lot remain to be known about the mechanisms and the molecular actors that take part in this hormonal dialogue. We have previously shown that Sl-IAA3, an Aux/IAA gene, is a molecular link between auxin and ethylene responses in tomato plants. We show here that the expression of Sl-IAA3 in etiolated seedlings is restricted to the inner side of the apical hook, opposite to that of the HOOKLESS gene whose loss-offunction mutation results in the absence of hook formation. We propose a model on how auxin and ethylene modulate the expression of Auxin Response Factor 2 (ARF2) via IAA3 and HLS protein to regulate hypocotyl bending.

Item Type:Article
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:French research institutions > Institut National de la Recherche Agronomique - INRA
Université de Toulouse > Institut National Polytechnique de Toulouse - INPT
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Deposited By:Magali GIRAUD TITONEL

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