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Title

The apoplastic antioxidant system and altered cell wall dynamics influence mesophyll conductance and the rate of photosynthesis

AuthorsClemente‐Moreno, María José; Gago, Jorje; Díaz-Vivancos, Pedro; Bernal Vicente, Agustina; Miedes, Eva; Bresta, Panagiota; Liakopoulos, Georgios; Fernie, Alisdair R.; Hernandez, Jose Antonio ; Flexas, Jaume
KeywordsPhotosynthesis
Apoplast
Cell wall
Mesophyll conductance
Reactive oxygen species
Stress responses
Nicotiana sylvestris
Issue Date19-Jun-2019
PublisherJohn Wiley & Sons
CitationPlant Journal
AbstractMesophyll conductance (gm), the diffusion of CO2 from substomatal cavities to the carboxylation sites in the chloroplasts, is a highly complex trait driving photosynthesis (net CO2 assimilation, AN). However, little is known concerning the mechanisms by which it is dynamically regulated. The apoplast is considered as a ‘key information bridge’ between the environment and cells. Interestingly, most of the environmental constraints affecting gm also cause apoplastic responses, cell wall (CW) alterations and metabolic rearrangements. Since CW thickness is a key determinant of gm, we hypothesize that other changes in this cellular compartiment should also influence gm. We study the relationship between the antioxidant apoplastic system and CW metabolism and the gm responses in tobacco plants (Nicotiana sylvestris L.) under two abiotic stresses (drought and salinity), combining in vivo gas‐exchange measurements with analyses of antioxidant activities, CW composition and primary metabolism. Stress treatments imposed substantial reductions in AN (58–54%) and gm (59%), accompanied by a strong antioxidant enzymatic response at the apoplastic and symplastic levels. Interestingly, apoplastic but not symplastic peroxidases were positively related to gm. Leaf anatomy remained mostly stable; however, the stress treatments significantly affected the CW composition, specifically pectins, which showed significant relationships with AN and gm. The treatments additionally promoted a differential primary metabolic response, and specific CW‐related metabolites including galactose, glucosamine and hydroxycinnamate showed exclusive relationships with gm independent of the stress. These results suggest that gm responses can be attributed to specific changes in the apoplastic antioxidant system and CW metabolism, opening up more possibilities for improving photosynthesis using breeding/biotechnological strategies
Publisher version (URL)https://doi.org/10.1111/tpj.14437
URIhttp://hdl.handle.net/10261/211645
DOI10.1111/tpj.14437
E-ISSN1365-313X
Appears in Collections:(CEBAS) Artículos
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