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S ‐nitrosoglutathione spraying improves stomatal conductance, Rubisco activity and antioxidant defense in both leaves and roots of sugarcane plants under water deficit
Author(s) -
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.
Publication year - 2017
Publication title -
physiologia plantarum
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.351
H-Index - 146
eISSN - 1399-3054
pISSN - 0031-9317
DOI - 10.1111/ppl.12575
Subject(s) - rubisco , photosynthesis , catalase , stomatal conductance , antioxidant , superoxide dismutase , biology , phosphoenolpyruvate carboxylase , chemistry , botany , horticulture , biochemistry
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 CO 2 assimilation of GSNO ‐sprayed plants under water deficit were evaluated. Sugarcane plants were sprayed with water or GSNO 100 μ M 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.