High CO2 favors ionic homeostasis, photoprotection, and lower photorespiration in salt‑stressed cashew plants

• Autorzy: Souza N.C.S. , Silveira J.A.G. , Silva E.N. , Neto M.C.L. , Lima C.S. , Aragao R.M. , Ferreira-Silva S.L.
• Języki publikacji: EN

Abstrakty

EN

The aim of this study was to evaluate the effects of elevated CO₂ concentration on acclimation mechanisms related to gas exchange, photochemical activity, photorespiration, and oxidative protection in cashew plants exposed to salinity. Thirty-day-old cashew plants were irrigated with nutrient solution without (control) or with supplemental NaCl (100 mM) for 2 weeks in the greenhouse. Afterward, control and salt-stressed plants were transferred to the growth chamber and supplied with atmospheric (380 µmol mol⁻¹) or high CO₂ (760 µmol mol⁻¹) concentrations for 15 days. The results show that elevated CO₂ alone reduced the CO₂ net assimilation rate (PN) without affecting stomatal conductance (gS) and transpiration rate (E), whereas salinity and NaCl + high CO₂ reduced the PN associated with a decrease in gS and E. The potential quantum yield of photosystem II (Fv/Fm) was not altered, but a slight reduction in electron transport rate and photochemical quenching (qP) in response to high CO₂ alone or combined with NaCl occurred. However, non-photochemical quenching increased due to the effects of high CO₂ and NaCl alone and by their combination. High CO₂ alleviated the toxic effects of Na⁺ favoring the K⁺ /Na⁺ ratio under salinity. High CO₂ coupled with salinity decreased glycolate oxidase activity and the contents of hydrogen peroxide (H₂O₂), NH₄⁺, and glyoxylate. Furthermore, we observed increase in membrane damage associated with increased thiobarbituric acid-reactive substances levels under high CO₂. High CO₂ also decreased ascorbate peroxidase activity, but did not affect superoxide dismutase activity. In general, our data suggest that high CO₂ could induce acclimation processes in plants independent of salinity, revealing a set of responses that are more associated with acclimation than with protective responses.

• Wydawca: -
• Czasopismo: Acta Physiologiae Plantarum
• Rocznik: 2019
• Tom: 41
• Numer: 09
• Opis fizyczny: Article 158 [14p.], fig.,ref.

Twórcy

autor

Souza N.C.S.

• Laboratorio de Metabolismo de Plantas, Departamento de Bioquímica e Biologia Molecular, Universidade Federal do Ceara, CP 6020, Fortaleza, Ceara CEP 60451‑970, Brazil

autor

Silveira J.A.G.

• Laboratorio de Metabolismo de Plantas, Departamento de Bioquímica e Biologia Molecular, Universidade Federal do Ceara, CP 6020, Fortaleza, Ceara CEP 60451‑970, Brazil

autor

Silva E.N.

• Universidade Estadual do Ceara, Faculdade de Educacao, Ciencias e Letras do Sertao Central, Quixada, Ceara CEP 63900‑000, Brazil

autor

Neto M.C.L.

• Instituto de Biociencias, Universidade Estadual Paulista (UNESP), Campos do Litoral Paulista, CP 73601, Sao Vicente, Sao Paulo CEP 11380‑972, Brazil

autor

Lima C.S.

• Laboratorio de Metabolismo de Plantas, Departamento de Bioquímica e Biologia Molecular, Universidade Federal do Ceara, CP 6020, Fortaleza, Ceara CEP 60451‑970, Brazil

autor

Aragao R.M.

• Universidade Federal Rural da Amazonia, UFRA, Campus de Capanema, Capanema, Pará CEP 68700‑030, Brazil

autor

Ferreira-Silva S.L.

• Pos-Graduacao em Producao Vegetal, Unidade Academica de Serra Talhada, Universidade Federal Rural de Pernambuco, CP 063, Serra Talhada, Pernambuco CEP 56900‑000, Brazil

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Identyfikatory

DOI

10.1007/s11738-019-2947-1