Cell wall composition and thickness affect mesophyll conductance to CO2 diffusion in Helianthus annuus under water deprivation
| Autor: | Josefina Bota, Jaume Flexas, Georgios Liakopoulos, Miquel Nadal, Panagiota Bresta, Dimosthenis Nikolopoulos, Margalida Roig-Oliver, George Karabourniotis |
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| Rok vydání: | 2020 |
| Předmět: |
0106 biological sciences
0301 basic medicine food.ingredient Pectin Physiology Plant Science Photosynthesis 01 natural sciences Acclimatization Diffusion Cell wall 03 medical and health sciences chemistry.chemical_compound food Cell Wall Helianthus annuus Lignin Cellulose Water-use efficiency Water Deprivation Water food and beverages Carbon Dioxide Plant Leaves 030104 developmental biology chemistry Biophysics Helianthus Mesophyll Cells 010606 plant biology & botany |
| Zdroj: | Miquel Nadal |
| ISSN: | 1460-2431 0022-0957 |
| Popis: | Water deprivation affects photosynthesis, leaf anatomy, and cell wall composition. Although the former effects have been widely studied, little is known regarding those changes in cell wall major (cellulose, hemicelluloses, pectin, and lignin) and minor (cell wall-bound phenolics) compounds in plants acclimated to short- and long-term water deprivation and during recovery. In particular, how these cell wall changes impact anatomy and/or photosynthesis, specifically mesophyll conductance to CO2 diffusion (gm), has been scarcely studied. To induce changes in photosynthesis, cell wall composition and anatomy, Helianthus annuus plants were studied under five conditions: (i) control (i.e. without stress) (CL); (ii) long-term water deficit stress (LT); (iii) long-term water deficit stress with recovery (LT-Rec); (iv) short-term water deficit stress (ST); and (v) short-term water deficit stress with recovery (ST-Rec), resulting in a wide photosynthetic range (from 3.80 ± 1.05 μmol CO2 m−2 s−1 to 24.53 ± 0.42 μmol CO2 m−2 s−1). Short- and long-term water deprivation and recovery induced distinctive responses of the examined traits, evidencing a cell wall dynamic turnover during plants acclimation to each condition. In particular, we demonstrated for the first time how gm correlated negatively with lignin and cell wall-bound phenolics and how the (cellulose+hemicelloses)/pectin ratio was linked to cell wall thickness (Tcw) variations. |
| Databáze: | OpenAIRE |
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