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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 ·.Pavel P, Vereshchagin· ·.Mikhail V, Rostovtseva Elena I., Balnokin ·.Yurii V
- Журнал: Planta
- Год издания: 2025
- Издательство: Springer Verlag
- Местоположение издательства: Germany
- DOI: 10.1007/s00425-025-04873-0
- Аннотация: Effects of salinity on the morphology, ion relations, and gas exchange of the leaves in the euhalophyte Suaedaaltissima (L.) Pall. were investigated with emphasis on the guard and epidermal cells. The presence of NaCl in the nutrientsolution (NS) at both growth-stimulating (250 mM) and growth-inhibiting (750 mM) concentrations resulted in increased leafsucculence, 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 accumulationin the guard and epidermal cells of leaves under salinity conditions. However, Na and Cl contents differed by not much inplants grown at 250 and 750 mM NaCl, indicating a mechanism preventing accumulation of Na+ and Cl− ions in cells pavingleaf surface at high NaCl concentrations. Examination of gs and E as functions of CO2 concentration in the leaf gas exchangechamber revealed better ability to regulate these parameters in 250 mM NaCl-grown plants than in 750 mM NaCl-grown orcontrol plants. The study of Pn dependent on CO2 concentration in leaf intercellular space revealed direct stimulating effectof NaCl on photosynthesis. We hypothesize that S. altissima, a species having anatomy and ultrastructure features of C4plants, improves its performance characteristics under saline conditions, optimizing not only the functioning of the stomatacomplex but also the process of CO2 assimilation, including the C4 fixation pathway
- Добавил в систему: Вахрамеева Татьяна Андреевна
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