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Morphological characteristics of guard cells and the participation of Na+ in the stomatal regulation of leaf gas exchange in the euhalophyte Suaeda altissima (L.) Pall. under saline conditionsстатья
Статья опубликована в высокорейтинговом журнале
Статья опубликована в журнале из списка Web of Science и/или Scopus- Авторы: Khalilova Lyudmila A., Leontieva Maria R., Pashkovskiy Mikhail V Vereshchagin Pavel P., Rostovtseva Elena I., Balnokin Yurii V.
- Журнал: Planta
- Том: 263
- Номер: 3
- Год издания: 2025
- Издательство: Springer Verlag
- Местоположение издательства: Germany
- Аннотация: Moderate concentrations of Na+ ions in the growth medium have positive effects on growth and performance characteristics of the C4 euhalophyte Suaeda altissima, optimizing functioning of both, stomata and photosynthetic apparatus. Effects of salinity on the morphology, ion relations, and gas exchange of the leaves in the euhalophyte Suaeda altissima (L.) Pall. were investigated with emphasis on the guard and epidermal cells. The presence of NaCl in the nutrient solution (NS) at both growth-stimulating (250 mM) and growth-inhibiting (750 mM) concentrations resulted in increased leaf succulence, net photosynthetic rate (Pn), and instantaneous water use efficiency (WUEi), and reduced stomatal conductance (gs), stomatal density on the leaf surface, and transpiration rate (E). X-ray microanalyses revealed Na and Cl accumulation in the guard and epidermal cells of leaves under salinity conditions. However, Na and Cl contents differed by not much in plants grown at 250 and 750 mM NaCl, indicating a mechanism preventing accumulation of Na+ and Cl- ions in cells paving leaf surface at high NaCl concentrations. Examination of gs and E as functions of CO2 concentration in the leaf gas exchange chamber revealed better ability to regulate these parameters in 250 mM NaCl-grown plants than in 750 mM NaCl-grown or control plants. The study of Pn dependent on CO2 concentration in leaf intercellular space revealed direct stimulating effect of NaCl on photosynthesis. We hypothesize that S. altissima, a species having anatomy and ultrastructure features of C4 plants, improves its performance characteristics under saline conditions, optimizing not only the functioning of the stomata complex but also the process of CO2 assimilation, including the C4 fixation pathway.
- Добавил в систему: Леонтьева Мария Романовна