Evaluation of Setaria viridis responses to salt treatment and potassium supply: a characterization of three contrasting accessions
2021
Valeriano, Filipe Rodrigues | de Moura, Stéfanie Menezes | Travassos-Lins, João | Alves-Ferreira, Marcio | Vieira, Ricardo Cardoso | Ortiz-Silva, Bianca | Reinert, Fernanda
Saline stress affects plants’ performance, causing change at the morphological and physiological levels. Several genotypes have developed mechanisms to face salinity, avoiding or tolerating it. Potassium supply is considered an advantageous strategy to reduce salt injury and to improve plant stress tolerance. In this study, we used three accessions (A10.1, ME034V and Ast-1) of Setaria viridis (L.) P.Beauv., a C₄ model plant, to evaluate the morphological responses upon exposure to two saline conditions (150 and 250 mM of NaCl) and to potassium supply (5 mM of KCl) for 96 h in roots. Based on the parameters evaluated (number and length of roots, dry mass and electrolyte leakage), we found a negative effect of NaCl on the root morphology and growth. Saline stress affected mainly the crown roots from S. viridis, but lesions on the leaves, such as depigmentation and necrosis, were also observed. Potassium supply improved most parameters in plants under moderate saline stress (150 mM NaCl), but was not able to mitigate the salt effects under severe saline condition (250 mM NaCl). Interestingly, the morphological analyses of S. viridis roots and shoots allowed us to identify the accession Ast-1 as more sensitive to salt stress than A10.1 and ME034V. The data presented here corroborate previous findings about potassium supply acting as an efficient strategy to mitigate the effects of salinity. The contrasting responses among the S. viridis accessions can be used to better understand the plasticity of salinity tolerance in plants and to develop more tolerant crops.
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