Potassium supply promotes the mitigation of NaCl-induced effects on leaf photochemistry, metabolism and morphology of Setaria viridis
| Autor: | Cristina Moll Hüther, David da Cunha Valença, Ana Carolina Mendes Bezerra, Bianca Ortiz-Silva, Marcio Alves Ferreira, Nicia E G Junqueira, Camila Ferreira de Pinho, Junior Borella, Leonardo Oliveira Medici, Fernanda Reinert |
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| Rok vydání: | 2021 |
| Předmět: |
Chlorophyll
0106 biological sciences 0301 basic medicine Salinity Photoinhibition Physiology Potassium Sodium Setaria Plant chemistry.chemical_element Plant Science Sodium Chloride Photochemistry Photosynthesis 01 natural sciences 03 medical and health sciences Stress Physiological Genetics Chlorophyll fluorescence biology Chemistry Setaria viridis food and beverages biology.organism_classification Plant Leaves 030104 developmental biology Shoot 010606 plant biology & botany |
| Zdroj: | Plant Physiology and Biochemistry. 160:193-210 |
| ISSN: | 0981-9428 |
| Popis: | Soil salinity has the potential to severely affect crop performance. To maintain cell functioning and improve salt tolerance, the maintenance of K+ homeostasis is crucial in several plant metabolism processes. Besides, potassium fertilization can efficiently alleviate the perilous effects of salinity. We characterized impacts in Setaria viridis exposed to NaCl and KCl to underlying photochemistry mechanisms, K+ and Na+ shoot contents, enzymatic activity, electrolytic leakage, and morphological responses focusing on non-stomatal limitation of photosynthesis. Plants were exposed to sodium chloride (NaCl; 0, 150 and 250 mM) and potassium chloride (KCl; 0, 5, 9 mM). The exposure to NaCl affected S. viridis leaves morphological and physiologically. Plants submitted to 150 mM showed reductions in performance indexes (PIabs and PItotal; JIP-test), and the presence of positive K- and L-bands. Plants exposed to 250 mM exhibited blockage in electron flow further than QA within 48h and permanent photoinhibition at 96 h. The presence of 9 and 5 mM of KCl counteracted the effects of NaCl on plants submitted to 150 mM, concomitant with increases in K+ accumulation and cell turgidity conservation, causing positive effects in plant growth and metabolism. Neither KCl concentrations were effective in reducing NaCl-induced effects on plants exposed to 250 mM of NaCl. Our results support the conclusion that greater availability of K+ alleviates the harmful effects of salinity in S. viridis under moderate stress and that application of KCl as means of lightning saline stress has a concentration and a salt level limit that must be experimentally determined. |
| Databáze: | OpenAIRE |
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