Artículo
Chloride reduces plant nitrate requirement and alleviates low nitrogen stress symptoms
Autor/es | Lucas, Marta
Díaz Espejo, Antonio Romero Jiménez, David Peinado Torrubia, Procopio Delgado Vaquero, Alba Álvarez Morales, Rosario ![]() ![]() ![]() ![]() ![]() ![]() Colmenero Flores, José Manuel Rosales, Miguel A. |
Departamento | Universidad de Sevilla. Departamento de Biología Vegetal y Ecología |
Fecha de publicación | 2024-07 |
Fecha de depósito | 2024-06-11 |
Publicado en |
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Resumen | Chloride (Cl−) is traditionally categorized as an antagonist of nitrate (NO3−) because Cl− hinders plant NO3− transport and accumulation. However, we have recently defined Cl− as a beneficial macronutrient for higher plants, ... Chloride (Cl−) is traditionally categorized as an antagonist of nitrate (NO3−) because Cl− hinders plant NO3− transport and accumulation. However, we have recently defined Cl− as a beneficial macronutrient for higher plants, due to specific functions that lead to more efficient use of water, nitrogen (N) and CO2 under optimal N and water supply. When accumulated in leaves at macronutrient levels, Cl− promotes growth through osmotic, physiological, metabolic, anatomical and cellular changes that improve plant performance under optimal NO3− nutrition. Nitrate over-fertilization in agriculture can adversely affect crop yield and nature, while its deficiency limits plant growth. To study the relationship between Cl− nutrition and NO3− availability, we have characterized different physiological responses such as growth and yield, N-use efficiency, water status, photosynthesis, leaf anatomy, pigments and antioxidants in tomato plants treated with or without 5 mM Cl− salts and increasing NO3− treatments (3–15 mM). First, we have demonstrated that 5 mM Cl− application can reduce the use of NO3− in the nutrient solution by up to half without detriment to plant growth and yield in tomato and other horticultural plants. Second, Cl− application reduced stress symptoms and improved plant growth under low-NO3− conditions. The Cl−-dependent resistance to low-N stress resulted from: more efficient use of the available NO3−; improved plant osmotic and water status regulation; improved stomatal conductance and photosynthetic rate; and better antioxidant response. We proposed that beneficial Cl− levels increase the crop ability to grow better with lower NO3− requirements and withstand N deficiency, promoting a more sustainable and resilient agriculture. |
Cita | Lucas, M., Díaz Espejo, A., Romero Jiménez, D., Peinado Torrubia, P., Delgado Vaquero, A., Álvarez Morales, R.,...,Rosales, M.A. (2024). Chloride reduces plant nitrate requirement and alleviates low nitrogen stress symptoms. Plant Physiology and Biochemistry, 212, 108717. https://doi.org/10.1016/j.plaphy.2024.108717. |
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