Non-stomatal limitation of photosynthesis by soil salinity

Pan, Ting; Liu, Minmin; Kreslavski, Vladimir D.; Zharmukhamedov, Sergey K.; Nie, Chenrong; Yu, Min; Кузнецов, В. В.; Allakhverdiev, Suleyman I.; Shabala, Sergey

doi:10.1080/10643389.2020.1735231

Cited by 175 publications

(116 citation statements)

References 194 publications

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“…Several observations infer that KEA1 and KEA2 also contribute to K + homeostasis. Maintenance of proper K + concentrations in the stroma is important for osmotic balance and stability and function of essential Calvin cycle enzymes and photosystem II (Pan et al ., 2020). For instance, light‐driven thylakoid lumen acidification is compensated partly by K + countertransport to the stroma (Finazzi et al ., 2015; Pottosin & Shabala, 2016).…”

Section: Discussionmentioning

confidence: 99%

Plastidial transporters KEA1 and KEA2 at the inner envelope membrane adjust stromal pH in the dark

et al. 2020

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Photosynthesis and carbon fixation depend critically on the regulation of pH in chloroplast compartments in the daylight and at night. While it is established that an alkaline stroma is required for carbon fixation, it is not known how alkaline stromal pH is formed, maintained or regulated. We tested whether two envelope transporters, AtKEA1 and AtKEA2, directly affected stromal pH in isolated Arabidopsis chloroplasts using the fluorescent probe 2ʹ,7ʹ-bis-(2-carboxyethyl)-5-(and-6)-carboxyfluorescein (BCECF). External K +-induced alkalinization of the stroma was observed in chloroplasts from wildtype (WT) plants but not from kea1kea2 mutants, suggesting that KEA1 and KEA2 mediate K + uptake/H + loss to modulate stromal pH. While light-stimulated alkalinization of the stroma was independent of KEA1 and KEA2, the rate of decay to neutral pH in the dark is delayed in kea1kea2 mutants. However, the dark-induced loss of a pH gradient across the thylakoid membrane was similar in WT and mutant chloroplasts. This indicates that proton influx from the cytosol mediated by envelope K + /H + antiporters contributes to adjustment of stromal pH upon light to dark transitions.

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Section: Discussionmentioning

confidence: 99%

Plastidial transporters KEA1 and KEA2 at the inner envelope membrane adjust stromal pH in the dark

et al. 2020

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“…Harmful ions can accumulate in chloroplasts, causing a direct toxic effect on the photosynthesis process by the degradation of photosynthetic pigments [ 17 ]. A decrease of the chlorophyll concentration in leaves, as well as disorganisation of the thylakoid membrane structure and reduction of thylakoid and grana number, were observed in various plant species that are sensitive to salt stress [ 16 , 18 , 19 ]. Moreover, salt stress destabilises protein complexes of the photosynthetic electron transport chain, such as photosystem II (PSII) with the oxygen evolving complex (OEC), photosystem I (PSI), the cytochrome b6f complex, and ATP synthase [ 20 , 21 , 22 ].…”

Section: Introductionmentioning

confidence: 99%

Stem Photosynthesis—A Key Element of Grass Pea (Lathyrus sativus L.) Acclimatisation to Salinity

Tokarz

Wesołowski

Tokarz

et al. 2021

IJMS

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Grass pea (Lathyrus sativus) is a leguminous plant of outstanding tolerance to abiotic stress. The aim of the presented study was to describe the mechanism of grass pea (Lathyrus sativus L.) photosynthetic apparatus acclimatisation strategies to salinity stress. The seedlings were cultivated in a hydroponic system in media containing various concentrations of NaCl (0, 50, and 100 mM), imitating none, moderate, and severe salinity, respectively, for three weeks. In order to characterise the function and structure of the photosynthetic apparatus, Chl a fluorescence, gas exchange measurements, proteome analysis, and Fourier-transform infrared spectroscopy (FT-IR) analysis were done inter alia. Significant differences in the response of the leaf and stem photosynthetic apparatus to severe salt stress were observed. Leaves became the place of harmful ion (Na+) accumulation, and the efficiency of their carboxylation decreased sharply. In turn, in stems, the reconstruction of the photosynthetic apparatus (antenna and photosystem complexes) activated alternative electron transport pathways, leading to effective ATP synthesis, which is required for the efficient translocation of Na+ to leaves. These changes enabled efficient stem carboxylation and made them the main source of assimilates. The observed changes indicate the high plasticity of grass pea photosynthetic apparatus, providing an effective mechanism of tolerance to salinity stress.

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“…The ability of photosynthetically active plant tissues to maintain intracellular Na and K homeostasis is one of their major salt stress tolerance mechanisms (Pan et al 2020;Shabala et al 2017;Shabala and Pottosin 2014;Wu et al 2018). Impairment of the intracellular Na and K homeostasis, however, results in inhibited cell division, photosynthesis, growth, and development (Yan et al 2013;Duan et al 2015).…”

Section: Introductionmentioning

confidence: 99%

Morpho-physiological and gene expression responses of wheat byAegilops cylindricaamphidiploids to salt stress

Kiani

Arzani

Rahimmalek

2020

Preprint

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A field experiment was carried out during 2017-2018 at the research farm of Isfahan University of Technology, located at Lavark (32 300N, 51 200E; 1,630 m asl), Iran, with a mean annual temperature and precipitation of 15º C and 140 mm. Prior to sowing, surface soil samples from the experimental site were taken from a depth of 0 30 cm, air-dried, and sieved through a 2-mm screen in order to determine their physico-chemical characteristics through analysis in the laboratory according to standard methods. The top 60-cm layer was found to be a clay loam soil (pH 7.5) with a bulk density of 1.48 g/cm3 and an average EC of 4 dS m -1 at the sowing date. At the harvesting date, however, the average soil EC of the salttreated experimental plots was measured at 20.4 dS m -1 . A split-plot design with three

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Non-stomatal limitation of photosynthesis by soil salinity

Cited by 175 publications

References 194 publications

Plastidial transporters KEA1 and KEA2 at the inner envelope membrane adjust stromal pH in the dark

Plastidial transporters KEA1 and KEA2 at the inner envelope membrane adjust stromal pH in the dark

Stem Photosynthesis—A Key Element of Grass Pea (Lathyrus sativus L.) Acclimatisation to Salinity

Morpho-physiological and gene expression responses of wheat byAegilops cylindricaamphidiploids to salt stress

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