Abstract
Abiotic stress is one of the major factors limiting plant growth and yield globally. Though substantial progress has been made in breeding and genetic manipulation of plants to enhance abiotic stress tolerance, the task remains as a challenge even today. Investigations on the priming activity of various chemicals in plants for enhancing abiotic stress tolerance have been undertaken over the past few years. Priming with γ-amino butyric acid (GABA) and β-amino butyric acid (BABA) gains greater attention, because priming with these non-protein amino acids equips the plants to resist abiotic stresses effectively without suffering costly energy investments in operating defence mechanisms. It is well documented that the protective effect of non-protein amino acids like BABA and GABA on plants is due to a potentiation of natural defence mechanisms against abiotic stresses but at the same time not activating the complete defence arsenal before the stress exposure. The exact mode of action of priming with GABA/BABA in plants is still a puzzle, though their importance as signaling molecules during stress is undoubtful. The better understanding of molecular, physiological, and ecological aspects of GABA/BABA priming might lead to the emergence of this technique as a successful strategy for enhancing the abiotic stress(es) tolerance potential of plants in the field, without compromising much on productivity.
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Abbreviations
- AABA:
-
α-Amino butyric acid
- ABA:
-
Abscisic acid
- ACC:
-
1-Aminocyclopropane-1-carboxylic acid
- BABA:
-
β-Amino butyric acid
- GABA:
-
γ-Amino butyric acid
- CAT:
-
Catalase
- DHA:
-
Dehydroascorbate
- GAD:
-
Glutamate decarboxylase
- GPX:
-
Glutathione peroxidase
- GR:
-
Glutathione reductase
- IAA:
-
Indole acetic acid
- JA:
-
Jasmonic acid
- LEA:
-
Late embryogenesis-abundant protein
- MDA:
-
Malondialdehyde
- MW:
-
Molecular weight
- NADH:
-
Nicotinamide adenine dinucleotide
- NPAAs:
-
Non-protein amino acids
- NADPH:
-
Nicotinamide adenine dinucleotide phosphate
- PEG:
-
Polyethelyne glycol
- RBPs:
-
RNA-binding proteins
- POD:
-
Peroxidases
- ROS:
-
Reactive oxygen species
- SA:
-
Salicylic acid
- SOD:
-
Superoxide dismutases
- ψw :
-
Water potential
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Acknowledgments
JTP would like to acknowledge the funding received from University Grants Commission (India) (39-367/2010(SR) and Kerala State Council for Science, Technology and Environment (KSCSTE), Govt. of Kerala (India) (011/SRSLS/2010/CSTE) and VK acknowledges for the research fellowship provided by KSCSTE. The authors acknowledge Dr. Nabeesa Salim, Rtd. Professor (Botany), University of Calicut, for her meaningful suggestions during the revision of the manuscript.
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Vijayakumari, K., Jisha, K.C. & Puthur, J.T. GABA/BABA priming: a means for enhancing abiotic stress tolerance potential of plants with less energy investments on defence cache. Acta Physiol Plant 38, 230 (2016). https://doi.org/10.1007/s11738-016-2254-z
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DOI: https://doi.org/10.1007/s11738-016-2254-z