γ-Aminobutyric acid may directly or indirectly regulate Arabidopsis ALMT9

Gilliham, Matthew; Xu, Bo

doi:10.1093/plphys/kiac399

Cited by 5 publications

(2 citation statements)

References 28 publications

(45 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Additionally, ABA enhances the synthesis of osmoprotectants, which help plants withstand harsh environmental conditions [ 4 ]. Recent research has revealed that GABA can modify the activity of ALUMINUM-ACTIVATED MALATE TRANSPORTERS (ALMTs), which are implicated in aluminum tolerance, root growth, pollen tube growth, and stomatal pore regulation [ 44 ]. These findings provide valuable insights into the mechanism by which GABA acts as a membrane potential-based signal, connecting plant metabolic status with various physiological processes [ 45 ].…”

Section: Discussionmentioning

confidence: 99%

Exogenous γ-aminobutyric acid improves the photosynthesis efficiency, soluble sugar contents, and mineral nutrients in pomegranate plants exposed to drought, salinity, and drought-salinity stresses

Zarbakhsh,

Shahsavar

2023

BMC Plant Biol

View full text Add to dashboard Cite

Background γ-aminobutyric acid (GABA), as a regulator of many aspects of plant growth, has a pivotal role in improving plant stress resistance. However, few studies have focused on the use of GABA in increasing plants’ resistance to interactional stresses, such as drought-salinity. Therefore, the focus of this study was to examine the effect of foliar application of GABA (0, 10, 20, and 40 mM) on growth indices and physio-biochemical parameters in plants of two pomegranate cultivars, ‘Rabab’ and ‘Atabaki’ exposed to drought, salinity, and drought-salinity. Results Under stress conditions, the photosynthetic capacity of two pomegranate cultivars, including transpiration rate, net photosynthetic rate, intercellular carbon dioxide concentration, stomatal conductance of water vapour, and mesophyll conductance, was significantly reduced. This resulted in a decrease in root morphological traits such as fresh and dry weight, diameter, and volume, as well as the fresh and dry weight of the aerial part of the plants. However, the application of GABA reversed the negative effects caused by stress treatments on growth parameters and maintained the photosynthetic capacity. GABA application has induced the accumulation of compatible osmolytes, including total soluble carbohydrate, starch, glucose, fructose, and sucrose, in charge of providing energy for cellular defense response against abiotic stresses. Analysis of mineral nutrients has shown that GABA application increases the absorption of potassium, potassium/sodium, magnesium, phosphorus, manganese, zinc, and iron. As concentration increased up to 40 mM, GABA prevented the uptake of toxic ions, sodium and chloride. Conclusions These findings highlight the potential of GABA as a biostimulant strategy to enhance plant stress tolerance.

show abstract

Section: Discussionmentioning

confidence: 99%

Exogenous γ-aminobutyric acid improves the photosynthesis efficiency, soluble sugar contents, and mineral nutrients in pomegranate plants exposed to drought, salinity, and drought-salinity stresses

Zarbakhsh,

Shahsavar

2023

BMC Plant Biol

View full text Add to dashboard Cite

show abstract

“…Note that, a second study failed to detect GABA-mediated anion transport through ALMT9 in a patch-clamp experiment when GABA was applied from the cytosolic or the vacuole sides ( Jaślan and De Angeli, 2022 ). This study was, however, criticised by the authors of the GABA-stomatal regulation study based on the nature of the ALMT9 expressed (GFP tag), the cell type it was expressed in (mesophyll cells), and the nature of the orthologous system ( Nicotiana benthamiana ) ( Gilliham and Xu, 2022 ). Hence, whether GABA acts directly or indirectly on ALMT9 is still an open question.…”

Section: Gabamentioning

confidence: 99%

Why did glutamate, GABA, and melatonin become intercellular signalling molecules in plants?

Caspi

Pantazopoulou

Prompers

et al. 2023

eLife

View full text Add to dashboard Cite

Intercellular signalling is an indispensable part of multicellular life. Understanding the commonalities and differences in how signalling molecules function in two remote branches of the tree of life may shed light on the reasons these molecules were originally recruited for intercellular signalling. Here we review the plant function of three highly studied animal intercellular signalling molecules, namely glutamate, γ-aminobutyric acid (GABA), and melatonin. By considering both their signalling function in plants and their broader physiological function, we suggest that molecules with an original function as key metabolites or active participants in reactive ion species scavenging have a high chance of becoming intercellular signalling molecules. Naturally, the evolution of machinery to transduce a message across the plasma membrane is necessary. This fact is demonstrated by three other well-studied animal intercellular signalling molecules, namely serotonin, dopamine, and acetylcholine, for which there is currently no evidence that they act as intercellular signalling molecules in plants.

show abstract

Expression of the grapevine anion transporter ALMT2 in Arabidopsis roots decreases the shoot Cl−/NO3− ratio under salt stress

Wu,

Henderson,

Walker

et al. 2024

Journal of Experimental Botany

View full text Add to dashboard Cite

Grapevines (Vitis vinifera, Vvi) are economically important crop plants which, when challenged with salt (NaCl) in soil and/or irrigation water, tend to accumulate Na+ and Cl– in aerial tissues impacting yield, and berry acceptability for winemaking. Grapevine (Vitis spp.) rootstocks vary in their capacity for shoot Cl− exclusion. Here, we characterise two putative anion transporter genes – Aluminium-activated Malate Transporter VviALMT2 and VviALMT8 – that were differentially expressed in the roots of efficient (140 Ruggeri) and inefficient (K51-40) Cl− excluding rootstocks, to explore their potential for impacting shoot Cl− exclusion. Using the Xenopus laevis oocyte expression system, VviALMT2 and VviALMT8 formed conductive channels that were highly permeable to NO3−, slightly-to-moderately permeable to other substrates including Cl− and malate, but impermeable to SO42−. RT-qPCR analyses revealed that VviALMT2 was more highly expressed in the root vasculature and up-regulated by high [NO3−] re-supply post starvation, while fluorescently tagged translational fusion VviALMT2 localised to the plasma membrane. As VviALMT8 showed no such features, we selected VviALMT2 as our salt exclusion candidate and assessed its function in planta. Expression of VviALMT2 in Arabidopsis thaliana root vasculature reduced shoot [Cl−]/[NO3−] after NaCl treatment, which suggests that VviALMT2 can be beneficial to plants under salt stress.

show abstract

γ-Aminobutyric acid may directly or indirectly regulate Arabidopsis ALMT9

Abstract: The mechanism by which GABA regulates stomatal pore aperture and anion transport activity of ALUMINUM-ACTIVATED MALATE TRANSPORTER 9 is debated.

Cited by 5 publications

References 28 publications

Exogenous γ-aminobutyric acid improves the photosynthesis efficiency, soluble sugar contents, and mineral nutrients in pomegranate plants exposed to drought, salinity, and drought-salinity stresses

Exogenous γ-aminobutyric acid improves the photosynthesis efficiency, soluble sugar contents, and mineral nutrients in pomegranate plants exposed to drought, salinity, and drought-salinity stresses

Why did glutamate, GABA, and melatonin become intercellular signalling molecules in plants?

Expression of the grapevine anion transporter ALMT2 in Arabidopsis roots decreases the shoot Cl−/NO3− ratio under salt stress

Contact Info

Product

Resources

About