Application of GABA (g-aminobutyricacid) to improve saline stress tolerance of chufa (CyperusesculentusL.var.sativusBoeck) plants by regulating their antioxidant potential and nitrogen assimilation
Ullah, Abd (Chinese Academy of Sciences. Xinjiang Institute of Ecology and Geography. Xinjiang Key Desert Plant Roots Ecology and Vegetation Restoration Laboratory)
Tariq, Akash (Chinese Academy of Sciences. Xinjiang Institute of Ecology and Geography. Xinjiang Key Desert Plant Roots Ecology and Vegetation Restoration Laboratory)
Zeng, Fanjiang (Chinese Academy of Sciences. Xinjiang Institute of Ecology and Geography. State Key Laboratory of Desert and Oasis Ecology)
Noor, Javaria (Islamia College University. Department of Botany)
Sardans i Galobart, Jordi (Centre de Recerca Ecològica i d'Aplicacions Forestals)
Asghar, Muhammad Ahsan (Eötvös Loránd Research Network.Centre for Agricultural Research)
Zhang, Zhihao (Chinese Academy of Sciences. Xinjiang Institute of Ecology and Geography. Xinjiang Key Desert Plant Roots Ecology and Vegetation Restoration Laboratory)
Peñuelas, Josep (Centre de Recerca Ecològica i d'Aplicacions Forestals)

Data:	2023
Resum:	The chufa is a perennial plant known for its almond-like underground tubers that have several health benefits for humans. GABA (γ-amino butyric acid) can regulate plants' tolerance to stress including tolerance to salinity. However, it is unknown how chufa plants respond to GABA application and salinity. Here, we analysed the impact of GABA (2 mM) on growth features and physio-biochemical changes in chufa seedlings subjected to different saline stress levels (SS; 0, 100 and 200 mM NaCl and Na2SO4, 1:1 molar ratio). Our findings show that increasing SS levels negatively affected growth and metabolism. Increased SS reduced growth (root and shoot length, and their fresh and dry weights) and photosynthetic pigments, and significantly increased hydrogen peroxide (H2O2), malondialdehyde (MDA) and osmolytes (i. e. soluble sugars, proline, soluble protein and superoxide dismutase (SOD). Peroxidase (POD) significantly declined at 50 mM and catalase (CAT) decreased under both stress levels. SS significantly enhanced salt ions (Na+ and Cl-) in roots and leaves but decreased root K+and increased Mg2+ at 100 mM, levels that then declined under 200 mM SS. However, foliar K+ and Mg2+ remained unchanged. As well, NO3- and NH4+ concentrations and nitrate reductase (NR) and glutamine oxoglutarate aminotransferase (GOGAT) declined significantly, while glutamine synthetase (GS) remained unaffected. However, exogenous GABA significantly reduced Na+ and Cl- ions, H2O2 and MDA and improved chlorophyll pigments, osmolytes, Mg2+and K+, antioxidant enzymes and N metabolism compared to untreated GABA peers. GABA might thus be able to improve the salinity stress tolerance of chufa by improving its cellular metabolism and preventing the build-up of harmful substances. Hence, exogenous GABA could be an effective approach for increasing salinity tolerance in chufa plants in salt-affected regions. Future studies should aim to elucidate the molecular mechanisms that operate when GABA regulates saline stress tolerance in chufa plants.
Ajuts:	Agencia Estatal de Investigación TED2021-132627B-I00 Agència de Gestió d'Ajuts Universitaris i de Recerca 2021/SGR-1333
Drets:	Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial i la comunicació pública de l'obra, sempre que no sigui amb finalitats comercials, i sempre que es reconegui l'autoria de l'obra original. No es permet la creació d'obres derivades.
Llengua:	Anglès
Document:	Article ; recerca ; Versió acceptada per publicar
Publicat a:	South African Journal of Botany, Vol. 157 (June 2023) , p. 540-552, ISSN 1727-9321

DOI: 10.1016/j.sajb.2023.04.027

Disponible a partir de: 2025-06-30 Postprint

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