S‐nitrosoglutathione spraying improves stomatal conductance, Rubisco activity and antioxidant defense in both leaves and roots of sugarcane plants under water deficit

Water deficit is a major environmental constraint on crop productivity and performance and nitric oxide (NO) is an important signaling molecule associated with many biochemical and physiological processes in plants under stressful conditions. This study aims to test the hypothesis that leaf spraying...

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Bibliographic Details
Published in:Physiologia plantarum 2017-08, Vol.160 (4), p.383-395
Main Authors: Silveira, Neidiquele M., Marcos, Fernanda C. C., Frungillo, Lucas, Moura, Bárbara B., Seabra, Amedea B., Salgado, Ione, Machado, Eduardo C., Hancock, John T., Ribeiro, Rafael V.
Format: Article
Language:English
Subjects:
Antioxidants
Antioxidants - metabolism
Assimilation
Biochemistry
Carbon dioxide
Catalase
Catalase - metabolism
Conductance
Crop production
Crops
Damage prevention
Dehydration
Enzymes
Leaves
Nitric oxide
Nitric Oxide Donors - pharmacology
Organs
Oxidation-Reduction
Oxygenase
Phosphoenolpyruvate carboxylase
Phosphoenolpyruvate Carboxylase - drug effects
Phosphoenolpyruvate Carboxylase - metabolism
Photosynthesis
Photosynthesis - drug effects
Plant growth
Plant Leaves - drug effects
Plant Leaves - enzymology
Plant Leaves - physiology
Plant Roots - drug effects
Plant Roots - enzymology
Plant Roots - physiology
Plant Stomata - drug effects
Plant Stomata - enzymology
Plant Stomata - physiology
Plant Transpiration - drug effects
Plants
Plants (botany)
Polyethylene glycol
Polyethylenes
Resistance
Ribulose-1,5-bisphosphate
Ribulose-bisphosphate carboxylase
Ribulose-Bisphosphate Carboxylase - drug effects
Ribulose-Bisphosphate Carboxylase - metabolism
Roots
S-Nitrosoglutathione - pharmacology
Saccharum - drug effects
Saccharum - enzymology
Saccharum - physiology
Spraying
Stomata
Stomatal conductance
Sugarcane
Superoxide dismutase
Superoxide Dismutase - metabolism
Water - physiology
Water deficit
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Summary:Water deficit is a major environmental constraint on crop productivity and performance and nitric oxide (NO) is an important signaling molecule associated with many biochemical and physiological processes in plants under stressful conditions. This study aims to test the hypothesis that leaf spraying of S‐nitrosoglutathione (GSNO), an NO donor, improves the antioxidant defense in both roots and leaves of sugarcane plants under water deficit, with positive consequences for photosynthesis. In addition, the roles of key photosynthetic enzymes ribulose‐1,5‐bisphosphate carboxylase/oxygenase (Rubisco) and phosphoenolpyruvate carboxylase (PEPC) in maintaining CO2 assimilation of GSNO‐sprayed plants under water deficit were evaluated. Sugarcane plants were sprayed with water or GSNO 100 μM and subjected to water deficit, by adding polyethylene glycol (PEG‐8000) to the nutrient solution. Sugarcane plants supplied with GSNO presented increases in the activity of antioxidant enzymes such as superoxide dismutase in leaves and catalase in roots, indicating higher antioxidant capacity under water deficit. Such adjustments induced by GSNO were sufficient to prevent oxidative damage in both organs and were associated with better leaf water status. As a consequence, GSNO spraying alleviated the negative impact of water deficit on stomatal conductance and photosynthetic rates, with plants also showing increases in Rubisco activity under water deficit.
ISSN:0031-9317
1399-3054
DOI:10.1111/ppl.12575