The calcium sensor CBL7 is required for Serendipita indica ‐induced growth stimulation in Arabidopsis thaliana , controlling defense against the endophyte and K + homoeostasis in the symbiosis - INRAE - Institut national de recherche pour l’agriculture, l’alimentation et l’environnement Access content directly
Journal Articles Plant, Cell and Environment Year : 2022

The calcium sensor CBL7 is required for Serendipita indica ‐induced growth stimulation in Arabidopsis thaliana , controlling defense against the endophyte and K + homoeostasis in the symbiosis

Abstract

Calcium is an important second messenger in plants. The activation of Ca 2+ signalling cascades is critical in the activation of adaptive processes in response to environmental stimuli. Root colonization by the growth promoting endophyte Serendipita indica involves the increase of cytosolic Ca 2+ levels in Arabidopsis thaliana . Here, we investigated transcriptional changes in Arabidopsis roots during symbiosis with S. indica . RNA‐seq profiling disclosed the induction of Calcineurin B‐like 7 ( CBL7 ) during early and later phases of the interaction. Consistently, reverse genetic evidence highlighted the functional relevance of CBL7 and tested the involvement of a CBL7‐CBL‐interacting protein kinase 13 signalling pathway. The loss‐of‐function of CBL7 abolished the growth promoting effect and affected root colonization. The transcriptomics analysis of cbl7 revealed the involvement of this Ca 2+ sensor in activating plant defense responses. Furthermore, we report on the contribution of CBL7 to potassium transport in Arabidopsis. We analysed K + contents in wild‐type and cbl7 plants and observed a significant increase of K + in roots of cbl7 plants, while shoot tissues demonstrated K + depletion. Taken together, our work associates CBL7 with an important role in the mutual interaction between Arabidopsis and S. indica and links CBL7 to K + transport.

Dates and versions

hal-04301865 , version 1 (23-11-2023)

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Marta‐marina Pérez-Alonso, Carmen Guerrero-Galán, Adrián González Ortega-Villaizán, Paloma Ortiz-García, Sandra Scholz, et al.. The calcium sensor CBL7 is required for Serendipita indica ‐induced growth stimulation in Arabidopsis thaliana , controlling defense against the endophyte and K + homoeostasis in the symbiosis. Plant, Cell and Environment, 2022, 45 (11), pp.3367-3382. ⟨10.1111/pce.14420⟩. ⟨hal-04301865⟩
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