Macronutrient chloride nutrition improves drought resistance by enhancing water deficit avoidance and tolerance mechanisms
|Author/s||Franco Navarro, Juan de Dios
Díaz Rueda, Pablo
Rivero Núñez, Carlos M.
Brumós Fuente, Javier
Rubio Casal, Alfredo Emilio
Cires Segura, Alfonso de
Colmenero Flores, José Manuel
Rosales Villegas, Miguel Ángel
|Department||Universidad de Sevilla. Departamento de Biología Vegetal y Ecología|
|Abstract||Chloride (Cl-), traditionally considered harmful for agriculture, has recently been defined as a beneficial macronutrient with specific roles that result in more efficient use of water (WUE), nitrogen (NUE), and CO2 in ...
Chloride (Cl-), traditionally considered harmful for agriculture, has recently been defined as a beneficial macronutrient with specific roles that result in more efficient use of water (WUE), nitrogen (NUE), and CO2 in well-watered plants. When supplied in a beneficial range of 1-5 mM, Cl- increases leaf cell size, improves leaf osmoregulation, and reduces water consumption without impairing photosynthetic efficiency, resulting in overall higher WUE. Thus, adequate management of Cl- nutrition arises as a potential strategy to increase the ability of plants to withstand water deficit. To study the relationship between Cl- nutrition and drought resistance, tobacco plants treated with 0.5-5 mM Cl- salts were subjected to sustained water deficit (WD; 60% field capacity) and water deprivation/rehydration treatments, in comparison with plants treated with equivalent concentrations of nitrate, sulfate, and phosphate salts. The results showed that Cl- application reduced stress symptoms and improved plant growth during water deficit. Drought resistance promoted by Cl- nutrition resulted from the simultaneous occurrence of water deficit avoidance and tolerance mechanisms, which improved leaf turgor, water balance, photosynthesis performance, and WUE. Thus, it is proposed that beneficial Cl- levels increase the ability of crops to withstand drought, promoting a more sustainable and resilient agriculture.
|Funding agencies||Consejo Superior de Investigaciones Científicas (CSIC)|
|Citation||Franco Navarro, J.d.D., Díaz Rueda, P., Rivero Núñez, C.M., Brumós Fuente, J., Rubio Casal, A.E., Cires Segura, A.d.,...,Rosales Villegas, M.Á. (2021). Macronutrient chloride nutrition improves drought resistance by enhancing water deficit avoidance and tolerance mechanisms. Journal of Experimental Botany, 72 (14), 5246-5261. https://doi.org/10.1093/jxb/erab143.|