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Synergistic Effects of Melatonin and Gamma-Aminobutyric Acid on Protection of Photosynthesis System in Response to Multiple Abiotic Stressors

Authors :
Mohammad Mohammadian
Fardad Didaran
Mehdi Seif
Edyta Sierka
Sasan Aliniaeifard
Hazem M. Kalaji
Mahmoud Lotfi
Aida Shomali
Wacław Roman Strobel
Source :
Cells, Vol 10, Iss 1631, p 1631 (2021), Cells, Volume 10, Issue 7
Publication Year :
2021
Publisher :
MDPI AG, 2021.

Abstract

GABA (gamma-aminobutyric acid) and melatonin are endogenous compounds that enhance plant responses to abiotic stresses. The response of Vicia faba to different stressors (salinity (NaCl), poly ethylene glycol (PEG), and sulfur dioxide (SO2)) was studied after priming with sole application of GABA and melatonin or their co-application (GABA + melatonin). Both melatonin and GABA and their co-application increased leaf area, number of flowers, shoot dry and fresh weight, and total biomass. Plants treated with GABA, melatonin, and GABA + melatonin developed larger stomata with wider aperture compared to the stomata of control plants. The functionality of the photosynthetic system was improved in primed plants. To investigate the photosynthetic functionality in details, the leaf samples of primed plants were exposed to different stressors, including SO2, PEG, and NaCl. The maximum quantum yield of photosystem II (PS II) was higher in the leaf samples of primed plants, while the non-photochemical quenching (NPQ) of primed plants was decreased when leaf samples were exposed to the stressors. Correlation analysis showed the association of initial PIabs with post-stress FV/FM and NPQ. Stressors attenuated the association of initial PIabs with both FV/FM and NPQ, while priming plants with GABA, melatonin, or GABA + melatonin minimized the effect of stressors by attenuating these correlations. In conclusion, priming plants with both GABA and melatonin improved growth and photosynthetic performance of Vicia faba and mitigated the effects of abiotic stressors on the photosynthetic performance.

Details

Language :
English
ISSN :
20734409
Volume :
10
Issue :
1631
Database :
OpenAIRE
Journal :
Cells
Accession number :
edsair.doi.dedup.....933e4cf173f75917f4540ca0ac1a7a43