Photosynthetica, 2019 (vol. 57), issue 3

Photosynthetica 2019, 57(3):753-761 | DOI: 10.32615/ps.2019.053

How glycine betaine induces tolerance of cucumber plants to salinity stress?

A. ESTAJI1, H.M. KALAJI2,3, H.R. KARIMI1, H.R. ROOSTA1, S.M. MOOSAVI-NEZHAD5
1 Department of Horticultural Sciences, Faculty of Agriculture, Vali-E-Asr University of Rafsanjan, Iran
2 Institute of Technology and Life Sciences (ITP), Falenty, Al. Hrabska 3, 05-090 Raszyn, Poland
3 Department of Plant Physiology, Faculty of Agriculture and Biology, Warsaw University of Life Sciences, Nowoursynowska 159, 02-776 Warsaw, Poland
5 Department of Horticultural Sciences, Faculty of Agriculture and Natural Resources, University of Tehran, Karaj, Iran

The mechanism of osmoprotectant action on photosynthesis process is still not well known, especially under salt stress. The objective of this study was to evaluate and explain the effect of glycine betaine (GB) on photosynthetic efficiency and other physiological parameters of cucumber plants grown under salinity stress. Our results indicated that salinity decreased chlorophyll and carotenoids content, Ca2+ and K+ concentrations, and quantum yield parameters, such as probability that a trapped exciton moves an electron in to the electron transport chain beyond QA, quantum yield of electron transport from QA to QB in PSII, quantum yield of reduction of end electron acceptors in PSI, performance index for the photochemical activity, total performance index for the photochemical activity, trapping per reaction centers, and other parameters related to primary photochemical reactions of PSII. However, the exogenously applied GB increased most of tested parameters including the total soluble carbohydrate, proline and GB content, and Ca2+ and K+ concentrations, under salt stress. We suggest that GB can play an essential role as regulator to improve photosynthetic efficiency and thus yield of cucumber plants under salt stress conditions. At the level of photosynthesis process, the application of exogenous GB indirectly enhanced the performance of the photosynthetic machinery of cucumber plant due to the reduction of the dissipated light energy, as heat, and the increase of primary reactions of photosynthesis efficiency.

Keywords: Cucumis sativus; Kautsky curve; OJIP transient; osmolyte; photosystem; pigment.

Received: May 20, 2018; Accepted: February 28, 2019; Prepublished online: June 6, 2019; Published: July 23, 2019Show citation

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ESTAJI, A., KALAJI, H.M., KARIMI, H.R., ROOSTA, H.R., & MOOSAVI-NEZHAD, S.M. (2019). How glycine betaine induces tolerance of cucumber plants to salinity stress? Photosynthetica57(3), 753-761. doi: 10.32615/ps.2019.053.
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