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The Salt Sensitivity Induced by Disruption of Cell Wall-Associated Kinase 1 (SlWAK1) Tomato Gene Is Linked to Altered Osmotic and Metabolic Homeostasis.


ABSTRACT: Tomato cell wall-associated kinase 1 (SlWAK1) has only been studied in biotic stress response and hence its function in abiotic stress remains unknown. In a screening under salinity of an insertional mutant collection of tomato (Solanum lycopersicum L.), a mutant exhibiting lower degree of leaf chlorosis than wild type (WT) together with reduced leaf Na+ accumulation was selected. Genetic analysis of the mutation revealed that a single T-DNA insertion in the SlWAK1 gene was responsible of the mutant phenotype. Slwak1 null mutant reduced its shoot growth compared with WT, despite its improved Na+ homeostasis. SlWAK1 disruption affected osmotic homeostasis, as leaf water content was lower in mutant than in WT under salt stress. In addition, Slwak1 altered the source-sink balance under salinity, by increasing sucrose content in roots. Finally, a significant fruit yield reduction was found in Slwak1 vs. WT under long-term salt stress, mainly due to lower fruit weight. Our results show that disruption of SlWAK1 induces a higher sucrose transport from source leaf to sink root, negatively affecting fruit, the main sink at adult stage.

SUBMITTER: Meco V 

PROVIDER: S-EPMC7503591 | biostudies-literature | 2020 Aug

REPOSITORIES: biostudies-literature

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The Salt Sensitivity Induced by Disruption of Cell Wall-Associated Kinase 1 (<i>SlWAK1</i>) Tomato Gene Is Linked to Altered Osmotic and Metabolic Homeostasis.

Meco Victoriano V   Egea Isabel I   Ortíz-Atienza Ana A   Drevensek Stéphanie S   Esch Elisabeth E   Yuste-Lisbona Fernando J FJ   Barneche Fredy F   Vriezen Wim W   Bolarin María C MC   Lozano Rafael R   Flores Francisco B FB  

International journal of molecular sciences 20200831 17


Tomato cell wall-associated kinase 1 (<i>SlWAK1</i>) has only been studied in biotic stress response and hence its function in abiotic stress remains unknown. In a screening under salinity of an insertional mutant collection of tomato (<i>Solanum lycopersicum</i> L.), a mutant exhibiting lower degree of leaf chlorosis than wild type (WT) together with reduced leaf Na<sup>+</sup> accumulation was selected. Genetic analysis of the mutation revealed that a single T-DNA insertion in the <i>SlWAK1</i  ...[more]

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