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Sl-IAA27 regulates strigolactone biosynthesis and mycorrhization in tomato (var. MicroTom)

Guillotin, Bruno and Etemadi-Shalamzari, Mohammad and Audran-Delalande, Corinne and Bouzayen, Mondher and Bécard, Guillaume and Combier, Jean-Philippe Sl-IAA27 regulates strigolactone biosynthesis and mycorrhization in tomato (var. MicroTom). (2017) New Phytologist, 213 (3). 1124-1132. ISSN 0028-646X

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Official URL: http://dx.doi.org/10.1111/nph.14246


- Root colonization by arbuscular mycorrhizal (AM) fungi is a complex and finely tuned process. Previous studies have shown that, among other plant hormones, auxin plays a role in this process but the specific involvement of Aux/IAAs, the key regulators of auxin responses, is still unknown. -In this study, we addressed the role of the tomato Sl-IAA27 during AM symbiosis by using Sl-IAA27-RNAi and pSL-IAA27::GUS stable tomato lines. - The data show that Sl-IAA27 expression is up-regulated by the AM fungus and that silencing of Sl-IAA27 has a negative impact on AM colonization. Sl-IAA27-silencing resulted in down-regulation of three genes involved in strigolactone synthesis, NSP1, D27 and MAX1, and treatment of Sl-IAA27-silenced plants with the strigolactone analog GR24 complemented their mycorrhizal defect phenotype. - Overall, the study identified an Aux/IAA gene as a new component of the signaling pathway controlling AM fungal colonization in tomato. This gene is proposed to control strigolactone biosynthesis via the regulation of NSP1.

Item Type:Article
Additional Information:Thanks to Wiley editor. The definitive version is available at http://onlinelibrary.wiley.com/doi/10.1111/nph.14246/abstract;jsessionid=72F026B51A5EFBC9B4DF1A5E45C558EA.f04t04
HAL Id:hal-01494826
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Université de Toulouse > Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE)
French research institutions > Institut National de la Recherche Agronomique - INRA (FRANCE)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UT3 (FRANCE)
Laboratory name:
info:French ANR. Grant Number: ANR-12-JSV7-0002-01 - info:TULIP. Grant Number: ANR-10-LABX-41
Deposited On:24 Mar 2017 08:46

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