γ-Aminobutyrate (GABA) Regulated Plant Defense: Mechanisms and Opportunities
Barry J. Shelp,Morteza Soleimani Aghdam,Edward J. Flaherty +2 more
- Vol. 10, Iss: 9, pp 1939
TLDR
The application of exogenous GABA is associated with lower ROS levels, enhanced membrane stability, changes in the levels of nonenzymatic and enzymatic antioxidants, and crosstalk among phytohormones as mentioned in this paper.Abstract:
Global climate change and associated adverse abiotic and biotic stress conditions affect plant growth and development, and agricultural sustainability in general. Abiotic and biotic stresses reduce respiration and associated energy generation in mitochondria, resulting in the elevated production of reactive oxygen species (ROS), which are employed to transmit cellular signaling information in response to the changing conditions. Excessive ROS accumulation can contribute to cell damage and death. Production of the non-protein amino acid γ-aminobutyrate (GABA) is also stimulated, resulting in partial restoration of respiratory processes and energy production. Accumulated GABA can bind directly to the aluminum-activated malate transporter and the guard cell outward rectifying K+ channel, thereby improving drought and hypoxia tolerance, respectively. Genetic manipulation of GABA metabolism and receptors, respectively, reveal positive relationships between GABA levels and abiotic/biotic stress tolerance, and between malate efflux from the root and heavy metal tolerance. The application of exogenous GABA is associated with lower ROS levels, enhanced membrane stability, changes in the levels of non-enzymatic and enzymatic antioxidants, and crosstalk among phytohormones. Exogenous GABA may be an effective and sustainable tolerance strategy against multiple stresses under field conditions.read more
Citations
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Glutamate: A multifunctional amino acid in plants.
TL;DR: The role of Glu signaling in plant growth, development, and defense responses has been investigated in this article , where it has been shown that Glu metabolism and Glu receptor-like proteins may entwine to regulate growth and development in plants.
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Try or Die: Dynamics of Plant Respiration and How to Survive Low Oxygen Conditions.
TL;DR: This review will update current knowledge about the mechanisms enabling plants to adapt to low-O2 environments, and how to survive re-oxygenation, and new insights into the role of mitochondrial retrograde signaling, chromatin modification, as well as moonlighting proteins and mitochondrial alternative electron transport pathways are presented.
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Genome-Wide Association Study Reveals Marker Trait Associations (MTA) for Waterlogging-Triggered Adventitious Roots and Aerenchyma Formation in Barley
S. M. Nuruzzaman Manik,Md. Quamruzzaman,Chenchen Zhao,Peter Johnson,Ian Hunt,Sergey Shabala,Meixue Zhou +6 more
TL;DR: In this article , the authors used a genome-wide association (GWAS) approach using 18,132 single nucleotide polymorphisms (SNPs) in a panel of 697 barley genotypes to reveal marker trait associations (MTA) conferring the above adaptive traits.
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γ-Aminobutyrate Improves the Postharvest Marketability of Horticultural Commodities: Advances and Prospects
TL;DR: In this article , it was shown that low temperature/controlled atmosphere storage is associated with the promotion of γ-aminobutyrate (GABA) pathway activity, with or without the accumulation of GABA, delaying senescence, preserving quality and ameliorating chilling injury.
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Gamma Aminobutyric Acid (GABA) Enrichment in Plant-Based Food – A Mini Review
TL;DR: In this paper , three main biosynthetic pathways of GABA in plants, that involved either decarboxylation of glutamate, degradation of polyamine or non-enzymatic conversion of proline into GABA are reported.
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