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Islam SNU, Kouser S, Hassan P, Asgher M, Shah AA, Khan NA. Gamma-aminobutyric acid interactions with phytohormones and its role in modulating abiotic and biotic stress in plants. STRESS BIOLOGY 2024; 4:36. [PMID: 39158750 PMCID: PMC11333426 DOI: 10.1007/s44154-024-00180-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/15/2024] [Accepted: 06/10/2024] [Indexed: 08/20/2024]
Abstract
Gamma-aminobutyric acid (GABA), a ubiquitous non-protein 4-carbon amino acid present in both prokaryotic and eukaryotic organisms. It is conventionally recognized as a neurotransmitter in mammals and plays a crucial role in plants. The context of this review centers on the impact of GABA in mitigating abiotic stresses induced by climate change, such as drought, salinity, heat, and heavy metal exposure. Beyond its neurotransmitter role, GABA emerges as a key player in diverse metabolic processes, safeguarding plants against multifaceted abiotic as well as biotic challenges. This comprehensive exploration delves into the GABA biosynthetic pathway, its transport mechanisms, and its intricate interplay with various abiotic stresses. The discussion extends to the nuanced relationship between GABA and phytohormones during abiotic stress acclimation, offering insights into the strategic development of mitigation strategies against these stresses. The delineation of GABA's crosstalk with phytohormones underscores its pivotal role in formulating crucial strategies for abiotic stress alleviation in plants.
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Affiliation(s)
- Syed Nazar Ul Islam
- Plant Physiology and Biochemistry Laboratory, Department of Botany, School of Biosciences and Biotechnology, Baba Ghulam Shah Badshah University, Rajouri, Jammu and Kashmir, 185234, India
| | - Shaista Kouser
- Plant Physiology and Biochemistry Laboratory, Department of Botany, School of Biosciences and Biotechnology, Baba Ghulam Shah Badshah University, Rajouri, Jammu and Kashmir, 185234, India
| | - Parveena Hassan
- School of Biosciences and Biotechnology, Baba Ghulam Shah Badshah University, Rajouri, Jammu and Kashmir, 185234, India
| | - Mohd Asgher
- Plant Physiology and Biochemistry Laboratory, Department of Botany, School of Biosciences and Biotechnology, Baba Ghulam Shah Badshah University, Rajouri, Jammu and Kashmir, 185234, India.
| | - Ali Asghar Shah
- School of Biosciences and Biotechnology, Baba Ghulam Shah Badshah University, Rajouri, Jammu and Kashmir, 185234, India
| | - Nafees A Khan
- Plant Physiology and Biochemistry Laboratory, Department of Botany, Aligarh Muslim University, Aligarh, 202002, India.
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Zhou M, Huang C, Lin J, Yuan Y, Lin L, Zhou J, Li Z. γ-Aminobutyric acid (GABA) priming alleviates acid-aluminum toxicity to roots of creeping bentgrass via enhancements in antioxidant defense and organic metabolites remodeling. PLANTA 2024; 260:33. [PMID: 38896325 DOI: 10.1007/s00425-024-04461-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/15/2023] [Accepted: 06/09/2024] [Indexed: 06/21/2024]
Abstract
MAIN CONCLUSION γ-Aminobutyric acid alleviates acid-aluminum toxicity to roots associated with enhanced antioxidant metabolism as well as accumulation and transportation of citric and malic acids. Aluminum (Al) toxicity has become the main limiting factor for crop growth and development in acidic soils and is further being aggravated worldwide due to continuous industrial pollution. The current study was designed to examine effects of GABA priming on alleviating acid-Al toxicity in terms of root growth, antioxidant defense, citrate and malate metabolisms, and extensive metabolites remodeling in roots under acidic conditions. Thirty-seven-day-old creeping bentgrass (Agrostis stolonifera) plants were used as test materials. Roots priming with or without 0.5 mM GABA for 3 days were cultivated in standard nutrient solution for 15 days as control or subjected to nutrient solution containing 5 mM AlCl3·6H2O for 15 days as acid-Al stress treatment. Roots were sampled for determinations of root characteristics, physiological and biochemical parameters, and metabolomics. GABA priming significantly alleviated acid-Al-induced root growth inhibition and oxidative damage, despite it promoted the accumulation of Al in roots. Analysis of metabolomics showed that GABA priming significantly increased accumulations of organic acids, amino acids, carbohydrates, and other metabolites in roots under acid-Al stress. In addition, GABA priming also significantly up-regulated key genes related to accumulation and transportation of malic and citric acids in roots under acid-Al stress. GABA-regulated metabolites participated in tricarboxylic acid cycle, GABA shunt, antioxidant defense system, and lipid metabolism, which played positive roles in reactive oxygen species scavenging, energy conversion, osmotic adjustment, and Al ion chelation in roots.
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Affiliation(s)
- Min Zhou
- College of Grassland Science and Technology, Sichuan Agricultural University, Chengdu, 61130, China
| | - Cheng Huang
- College of Grassland Science and Technology, Sichuan Agricultural University, Chengdu, 61130, China
| | - Junnan Lin
- College of Grassland Science and Technology, Sichuan Agricultural University, Chengdu, 61130, China
| | - Yan Yuan
- College of Grassland Science and Technology, Sichuan Agricultural University, Chengdu, 61130, China
| | - Long Lin
- College of Grassland Science and Technology, Sichuan Agricultural University, Chengdu, 61130, China
| | - Jianzhen Zhou
- College of Grassland Science and Technology, Sichuan Agricultural University, Chengdu, 61130, China
| | - Zhou Li
- College of Grassland Science and Technology, Sichuan Agricultural University, Chengdu, 61130, China.
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Khan Z, Jan R, Asif S, Farooq M, Kim KM. Exogenous GABA Enhances Copper Stress Resilience in Rice Plants via Antioxidant Defense Mechanisms, Gene Regulation, Mineral Uptake, and Copper Homeostasis. Antioxidants (Basel) 2024; 13:700. [PMID: 38929139 PMCID: PMC11200589 DOI: 10.3390/antiox13060700] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2024] [Revised: 06/03/2024] [Accepted: 06/04/2024] [Indexed: 06/28/2024] Open
Abstract
The importance of gamma-aminobutyric acid (GABA) in plants has been highlighted due to its critical role in mitigating metal toxicity, specifically countering the inhibitory effects of copper stress on rice plants. This study involved pre-treating rice plants with 1 mM GABA for one week, followed by exposure to varying concentrations of copper at 50 μM, 100 μM, and 200 μM. Under copper stress, particularly at 100 μM and 200 μM, plant height, biomass, chlorophyll content, relative water content, mineral content, and antioxidant activity decreased significantly compared to control conditions. However, GABA treatment significantly alleviated the adverse effects of copper stress. It increased plant height by 13%, 18%, and 32%; plant biomass by 28%, 52%, and 60%; chlorophyll content by 12%, 30%, and 24%; and relative water content by 10%, 24%, and 26% in comparison to the C50, C100, and C200 treatments. Furthermore, GABA treatment effectively reduced electrolyte leakage by 11%, 34%, and 39%, and the concentration of reactive oxygen species, such as malondialdehyde (MDA), by 9%, 22%, and 27%, hydrogen peroxide (H2O2) by 12%, 38%, and 30%, and superoxide anion content by 8%, 33, and 39% in comparison to C50, C100, and C200 treatments. Additionally, GABA supplementation led to elevated levels of glutathione by 69% and 80%, superoxide dismutase by 22% and 125%, ascorbate peroxidase by 12% and 125%, and catalase by 75% and 100% in the C100+G and C200+G groups as compared to the C100 and C200 treatments. Similarly, GABA application upregulated the expression of GABA shunt pathway-related genes, including gamma-aminobutyric transaminase (OsGABA-T) by 38% and 80% and succinic semialdehyde dehydrogenase (OsSSADH) by 60% and 94% in the C100+G and C200+G groups, respectively, as compared to the C100 and C200 treatments. Conversely, the expression of gamma-aminobutyric acid dehydrogenase (OsGAD) was downregulated. GABA application reduced the absorption of Cu2+ by 54% and 47% in C100+G and C200+G groups as compared to C100, and C200 treatments. Moreover, GABA treatment enhanced the uptake of Ca2+ by 26% and 82%, Mg2+ by 12% and 67%, and K+ by 28% and 128% in the C100+G and C200+G groups as compared to C100, and C200 treatments. These findings underscore the pivotal role of GABA-induced enhancements in various physiological and molecular processes, such as plant growth, chlorophyll content, water content, antioxidant capacity, gene regulation, mineral uptake, and copper sequestration, in enhancing plant tolerance to copper stress. Such mechanistic insights offer promising implications for the advancement of safe and sustainable food production practices.
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Affiliation(s)
- Zakirullah Khan
- Department of Applied Biosciences, Graduate School, Kyungpook National University, Daegu 41566, Republic of Korea; (Z.K.); (S.A.); (M.F.)
| | - Rahmatullah Jan
- Department of Applied Biosciences, Graduate School, Kyungpook National University, Daegu 41566, Republic of Korea; (Z.K.); (S.A.); (M.F.)
- Coastal Agriculture Research Institute, Kyungpook National University, Daegu 41566, Republic of Korea
| | - Saleem Asif
- Department of Applied Biosciences, Graduate School, Kyungpook National University, Daegu 41566, Republic of Korea; (Z.K.); (S.A.); (M.F.)
| | - Muhammad Farooq
- Department of Applied Biosciences, Graduate School, Kyungpook National University, Daegu 41566, Republic of Korea; (Z.K.); (S.A.); (M.F.)
| | - Kyung-Min Kim
- Department of Applied Biosciences, Graduate School, Kyungpook National University, Daegu 41566, Republic of Korea; (Z.K.); (S.A.); (M.F.)
- Coastal Agriculture Research Institute, Kyungpook National University, Daegu 41566, Republic of Korea
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Qian Z, Lu L, Zihan W, Qianyue B, Chungang Z, Shuheng Z, Jiali P, Jiaxin Y, Shuang Z, Jian W. Gamma-aminobutyric acid (GABA) improves salinity stress tolerance in soybean seedlings by modulating their mineral nutrition, osmolyte contents, and ascorbate-glutathione cycle. BMC PLANT BIOLOGY 2024; 24:365. [PMID: 38706002 PMCID: PMC11071273 DOI: 10.1186/s12870-024-05023-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/09/2024] [Accepted: 04/15/2024] [Indexed: 05/07/2024]
Abstract
BACKGROUND In plants, GABA plays a critical role in regulating salinity stress tolerance. However, the response of soybean seedlings (Glycine max L.) to exogenous gamma-aminobutyric acid (GABA) under saline stress conditions has not been fully elucidated. RESULTS This study investigated the effects of exogenous GABA (2 mM) on plant biomass and the physiological mechanism through which soybean plants are affected by saline stress conditions (0, 40, and 80 mM of NaCl and Na2SO4 at a 1:1 molar ratio). We noticed that increased salinity stress negatively impacted the growth and metabolism of soybean seedlings, compared to control. The root-stem-leaf biomass (27- and 33%, 20- and 58%, and 25- and 59% under 40- and 80 mM stress, respectively]) and the concentration of chlorophyll a and chlorophyll b significantly decreased. Moreover, the carotenoid content increased significantly (by 35%) following treatment with 40 mM stress. The results exhibited significant increase in the concentration of hydrogen peroxide (H2O2), malondialdehyde (MDA), dehydroascorbic acid (DHA) oxidized glutathione (GSSG), Na+, and Cl- under 40- and 80 mM stress levels, respectively. However, the concentration of mineral nutrients, soluble proteins, and soluble sugars reduced significantly under both salinity stress levels. In contrast, the proline and glycine betaine concentrations increased compared with those in the control group. Moreover, the enzymatic activities of ascorbate peroxidase, monodehydroascorbate reductase, glutathione reductase, and glutathione peroxidase decreased significantly, while those of superoxide dismutase, catalase, peroxidase, and dehydroascorbate reductase increased following saline stress, indicating the overall sensitivity of the ascorbate-glutathione cycle (AsA-GSH). However, exogenous GABA decreased Na+, Cl-, H2O2, and MDA concentration but enhanced photosynthetic pigments, mineral nutrients (K+, K+/Na+ ratio, Zn2+, Fe2+, Mg2+, and Ca2+); osmolytes (proline, glycine betaine, soluble sugar, and soluble protein); enzymatic antioxidant activities; and AsA-GSH pools, thus reducing salinity-associated stress damage and resulting in improved growth and biomass. The positive impact of exogenously applied GABA on soybean plants could be attributed to its ability to improve their physiological stress response mechanisms and reduce harmful substances. CONCLUSION Applying GABA to soybean plants could be an effective strategy for mitigating salinity stress. In the future, molecular studies may contribute to a better understanding of the mechanisms by which GABA regulates salt tolerance in soybeans.
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Affiliation(s)
- Zhao Qian
- School of Life Sciences, Changchun Normal University, Changchun, 130032, China
| | - Liu Lu
- School of Agriculture, Jilin Agricultural University, Changchun, Jilin, 130118, China
| | - Wei Zihan
- School of Life Sciences, Wuhan University, Wuhan, 430072, China
| | - Bai Qianyue
- School of Agriculture, Jilin Agricultural University, Changchun, Jilin, 130118, China
| | - Zhao Chungang
- School of Agriculture, Jilin Agricultural University, Changchun, Jilin, 130118, China
| | - Zhang Shuheng
- School of Agriculture, Jilin Agricultural University, Changchun, Jilin, 130118, China
| | - Pan Jiali
- School of Life Sciences, Changchun Normal University, Changchun, 130032, China
| | - Yu Jiaxin
- School of Life Sciences, Changchun Normal University, Changchun, 130032, China
| | - Zhang Shuang
- School of Life Sciences, Changchun Normal University, Changchun, 130032, China
| | - Wei Jian
- School of Life Sciences, Changchun Normal University, Changchun, 130032, China.
- School of Agriculture, Jilin Agricultural University, Changchun, Jilin, 130118, China.
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Ahmad S, Fariduddin Q. "Deciphering the enigmatic role of gamma-aminobutyric acid (GABA) in plants: Synthesis, transport, regulation, signaling, and biological roles in interaction with growth regulators and abiotic stresses.". PLANT PHYSIOLOGY AND BIOCHEMISTRY : PPB 2024; 208:108502. [PMID: 38492486 DOI: 10.1016/j.plaphy.2024.108502] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/29/2023] [Revised: 02/26/2024] [Accepted: 03/03/2024] [Indexed: 03/18/2024]
Abstract
Gamma-aminobutyric acid (GABA) is an amino acid with a four-carbon structure, widely distributed in various organisms. It exists as a zwitterion, possessing both positive and negative charges, enabling it to interact with other molecules and participate in numerous physiological processes. GABA is widely distributed in various plant cell compartments such as cytoplasm mitochondria, vacuoles, peroxisomes, and plastids. GABA is primarily synthesized from glutamate using glutamate decarboxylase and participates in the GABA shunt within mitochondria, regulating carbon and nitrogen metabolism in plants The transport of GABA is regulated by several intracellular and intercellular transporters such as aluminium-activated malate transporters (ALMTs), GABA transporters (GATs), bidirectional amino acid transporters (BATs), and cationic amino acid transporters (CATs). GABA plays a vital role in cellular transformations, gene expression, cell wall modifications, and signal transduction in plants. Recent research has unveiled the role of GABA as a signaling molecule in plants, regulating stomatal movement and pollen tube growth. This review provides insights into multifaceted impact of GABA on physiological and biochemical traits in plants, including cellular communication, pH regulation, Krebs cycle circumvention, and carbon and nitrogen equilibrium. The review highlights involvement of GABA in improving the antioxidant defense system of plants, mitigating levels of reactive oxygen species under normal and stressed conditions. Moreover, the interplay of GABA with other plant growth regulators (PGRs) have also been explored.
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Affiliation(s)
- Saif Ahmad
- Plant Physiology and Biochemistry Section, Department of Botany, Faculty of Life Sciences, Aligarh Muslim University, Aligarh, 202002, India
| | - Qazi Fariduddin
- Plant Physiology and Biochemistry Section, Department of Botany, Faculty of Life Sciences, Aligarh Muslim University, Aligarh, 202002, India.
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Al-Quraan NA, Samarah NH, Tanash AA. Effect of drought stress on wheat ( Triticum durum) growth and metabolism: insight from GABA shunt, reactive oxygen species and dehydrin genes expression. FUNCTIONAL PLANT BIOLOGY : FPB 2024; 51:NULL. [PMID: 36346967 DOI: 10.1071/fp22177] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/10/2022] [Accepted: 10/18/2022] [Indexed: 06/16/2023]
Abstract
Activation of γ-aminobutyric acid (GABA) shunt pathway and upregulation of dehydrins are involved in metabolic homeostasis and protective mechanisms against drought stress. Seed germination percentage, seedling growth, levels of GABA, alanine, glutamate, malondialdehyde (MDA), and the expression of glutamate decarboxylase (GAD ) and dehydrin (dhn and wcor ) genes were examined in post-germination and seedlings of four durum wheat (Triticum durum L.) cultivars in response to water holding capacity levels (80%, 50%, and 20%). Data showed a significant decrease in seed germination percentage, seedling length, fresh and dry weight, and water content as water holding capacity level was decreased. Levels of GABA, alanine, glutamate, and MDA were significantly increased with a negative correlation in post-germination and seedling stages as water holding capacity level was decreased. Prolonged exposure to drought stress increased the GAD expression that activated GABA shunt pathway especially at seedlings growth stage to maintain carbon/nitrogen balance, amino acids and carbohydrates metabolism, and plant growth regulation under drought stress. The mRNA transcripts of dhn and wcor significantly increased as water availability decreased in all wheat cultivars during the post-germination stage presumably to enhance plant tolerance to drought stress by cell membrane protection, cryoprotection of enzymes, and prevention of reactive oxygen species (ROS) accumulation. This study showed that the four durum wheat cultivars responded differently to drought stress especially during the seedling growth stage which might be connected with ROS scavenging systems and the activation of antioxidant enzymes that were associated with activation of GABA shunt pathway and the production of GABA in durum seedlings.
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Affiliation(s)
- Nisreen A Al-Quraan
- Department of Biotechnology and Genetic Engineering, Faculty of Science and Arts, Jordan University of Science and Technology, Irbid 22110, Jordan
| | - Nezar H Samarah
- Department of Plant Production, Faculty of Agriculture, Jordan University of Science and Technology, Irbid 22110, Jordan
| | - Ayah A Tanash
- Department of Biotechnology and Genetic Engineering, Faculty of Science and Arts, Jordan University of Science and Technology, Irbid 22110, Jordan
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Xu B, Feng X, Piechatzek A, Zhang S, Konrad KR, Kromdijk J, Hedrich R, Gilliham M. The GABA shunt contributes to ROS homeostasis in guard cells of Arabidopsis. THE NEW PHYTOLOGIST 2024; 241:73-81. [PMID: 37936524 DOI: 10.1111/nph.19390] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/15/2023] [Accepted: 10/23/2023] [Indexed: 11/09/2023]
Abstract
γ-Aminobutyric acid (GABA) accumulates rapidly under stress via the GABA shunt pathway, which has been implicated in reducing the accumulation of stress-induced reactive oxygen species (ROS) in plants. γ-Aminobutyric acid has been demonstrated to act as a guard-cell signal in Arabidopsis thaliana, modulating stomatal opening. Knockout of the major GABA synthesis enzyme Glutamate Decarboxylase 2 (GAD2) increases the aperture of gad2 mutants, which results in greater stomatal conductance and reduces water-use efficiency compared with wild-type plants. Here, we found that the additional loss of GAD1, GAD4, and GAD5 in gad2 leaves increased GABA deficiency but abolished the more open stomatal pore phenotype of gad2, which we link to increased cytosolic calcium (Ca2+ ) and ROS accumulation in gad1/2/4/5 guard cells. Compared with wild-type and gad2 plants, glutamate was ineffective in closing gad1/2/4/5 stomatal pores, whereas lowering apoplastic calcium, applying ROS inhibitors or complementation with GAD2 reduced gad1/2/4/5 guard-cell ROS, restored the gad2-like greater stomatal apertures of gad1/2/4/5 beyond that of wild-type. We conclude that GADs are important contributors to ROS homeostasis in guard cells likely via a Ca2+ -mediated pathway. As such, this study reveals greater complexity in GABA's role as a guard-cell signal and the interactions it has with other established signals.
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Affiliation(s)
- Bo Xu
- Plant Transport and Signalling Lab, ARC Centre of Excellence in Plant Energy Biology, School of Agriculture, Food and Wine & Waite Research Institute, Glen Osmond, SA, 5064, Australia
| | - Xueying Feng
- Plant Transport and Signalling Lab, ARC Centre of Excellence in Plant Energy Biology, School of Agriculture, Food and Wine & Waite Research Institute, Glen Osmond, SA, 5064, Australia
| | - Adriane Piechatzek
- Plant Transport and Signalling Lab, ARC Centre of Excellence in Plant Energy Biology, School of Agriculture, Food and Wine & Waite Research Institute, Glen Osmond, SA, 5064, Australia
| | - Shuqun Zhang
- Division of Biochemistry, University of Missouri, Columbia, MO, 65211, USA
| | - Kai R Konrad
- Institute for Molecular Plant Physiology and Biophysics, University of Wuerzburg, Julius von-Sachs Platz 2, D-97082, Würzburg, Germany
| | - Johannes Kromdijk
- Department of Plant Sciences, University of Cambridge, Downing St., Cambridge, CB2 3EA, UK
| | - Rainer Hedrich
- Institute for Molecular Plant Physiology and Biophysics, University of Wuerzburg, Julius von-Sachs Platz 2, D-97082, Würzburg, Germany
| | - Matthew Gilliham
- Plant Transport and Signalling Lab, ARC Centre of Excellence in Plant Energy Biology, School of Agriculture, Food and Wine & Waite Research Institute, Glen Osmond, SA, 5064, Australia
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Yan P, Wang Y, Yu C, Piao J, Li S, Liu Y, Li S. The Targeted Regulation of BDUbc and BDSKL1 Enhances Resistance to Blight in Bambusa pervariabilis × Dendrocalamopsis grandis. Int J Mol Sci 2024; 25:569. [PMID: 38203739 PMCID: PMC10779405 DOI: 10.3390/ijms25010569] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/03/2023] [Revised: 12/23/2023] [Accepted: 12/29/2023] [Indexed: 01/12/2024] Open
Abstract
Arthrinium phaeospermum is the major pathogen responsible for the significant stem disease "blight" in B. pervariabilis × D. grandis. The interacting proteins of the key pathogenic factor ApCtf1β, BDUbc and BDSKL1, have previously been obtained by two-hybrid, BiFC, GST pull-down yeast assays. However, the functions of these interacting proteins remain unknown. This study successfully obtained transgenic plants overexpressing BDUbc, BDSKL1, and BDUbc + BDSKL1 via Agrobacterium-mediated gene overexpression. qRT-PCR analysis revealed significantly increased expression levels of BDUbc and BDSKL1 in the transgenic plants. After infection with the pathogenic spore suspension, the disease incidence and severity index significantly decreased across all three transgenic plants, accompanied by a marked increase in defense enzyme levels. Notably, the co-transformed plant, OE-BDUbc + BDSKL1, demonstrated the lowest disease incidence and severity index among the transgenic variants. These results not only indicate that BDUbc and BDSKL1 are disease-resistant genes, but also that these two genes may exhibit a synergistic enhancement effect, which further improves the resistance to blight in Bambusa pervariabilis × Dendrocalamopsis grandis.
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Affiliation(s)
- Peng Yan
- College of Forestry, Sichuan Agricultural University, Chengdu 611130, China; (P.Y.); (Y.W.); (C.Y.); (J.P.); (S.L.); (Y.L.)
| | - Yisi Wang
- College of Forestry, Sichuan Agricultural University, Chengdu 611130, China; (P.Y.); (Y.W.); (C.Y.); (J.P.); (S.L.); (Y.L.)
| | - Cailin Yu
- College of Forestry, Sichuan Agricultural University, Chengdu 611130, China; (P.Y.); (Y.W.); (C.Y.); (J.P.); (S.L.); (Y.L.)
| | - Jingmei Piao
- College of Forestry, Sichuan Agricultural University, Chengdu 611130, China; (P.Y.); (Y.W.); (C.Y.); (J.P.); (S.L.); (Y.L.)
| | - Shuying Li
- College of Forestry, Sichuan Agricultural University, Chengdu 611130, China; (P.Y.); (Y.W.); (C.Y.); (J.P.); (S.L.); (Y.L.)
| | - Yinggao Liu
- College of Forestry, Sichuan Agricultural University, Chengdu 611130, China; (P.Y.); (Y.W.); (C.Y.); (J.P.); (S.L.); (Y.L.)
| | - Shujiang Li
- College of Forestry, Sichuan Agricultural University, Chengdu 611130, China; (P.Y.); (Y.W.); (C.Y.); (J.P.); (S.L.); (Y.L.)
- National Forestry and Grassland Administration Key Laboratory of Forest Resources Conservation and Ecological Safety on the Upper Reaches of the Yangtze River, Chengdu 611130, China
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Lv Y, Zhao Y, He Y, Wang J, Zheng Y, Chen X, Huang F, Liu J, Yu L. Synergistic effects of gamma-aminobutyric acid and melatonin on seed germination and cadmium tolerance in tomato. PLANT SIGNALING & BEHAVIOR 2023; 18:2216001. [PMID: 37302802 DOI: 10.1080/15592324.2023.2216001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/06/2022] [Revised: 01/19/2023] [Accepted: 02/20/2023] [Indexed: 06/13/2023]
Abstract
The effects of exogenous γ-aminobutyric acid (GABA) and melatonin (MT) on tomato seed germination and shoot growth exposed to cadmium stress were investigated. On the one hand, treatment with MT (10-200 μM) or GABA (10-200 μM) alone could significantly relieve cadmium stress in tomato seedlings, which is reflected in increasing the germination rate, vigor index, fresh weight, dry weight and radicle lengths of tomato seeds, as well as the soluble content compared to the absence of exogenous treatment, and the alleviating effect reached the peak in the 200 µM GABA or 150 µM MT alone. On the other hand, exogenous MT and GABA showed synergistic effects on the germination of tomato seed under cadmium stress. Moreover, the application of 100 µM GABA combined with 100 µM MT markedly decreased the contents of Cd and MDA by upregulating the activities of antioxidant enzymes, thereby alleviating the toxic effect of cadmium stress on tomato seeds. Collectively, the combinational strategy showed significant positive effects on seed germination and cadmium stress resistance in tomato.
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Affiliation(s)
- Yiying Lv
- Yunnan Urban Agricultural Engineering and Technological Research Center, College of Agronomy, Kunming University, Kunming, China
| | - Yongteng Zhao
- Yunnan Urban Agricultural Engineering and Technological Research Center, College of Agronomy, Kunming University, Kunming, China
- Faculty of Life Science and Technology, Kunming University of Science and Technology, Kunming, China
| | - Yuansheng He
- Yunnan Tobacco Company Lincang Company, Lincang, Yunnan, China
| | - Jiming Wang
- Yunnan Tobacco Company Lincang Company, Lincang, Yunnan, China
| | - Yuanxian Zheng
- Yunnan Tobacco Company Lincang Company, Lincang, Yunnan, China
| | - Xiaolong Chen
- Henan China Tobacco Industry Co. Ltd, Zhengzhou, Henan, China
| | - Feiyan Huang
- Yunnan Urban Agricultural Engineering and Technological Research Center, College of Agronomy, Kunming University, Kunming, China
| | - Jiani Liu
- Yunnan Urban Agricultural Engineering and Technological Research Center, College of Agronomy, Kunming University, Kunming, China
| | - Lei Yu
- Yunnan Urban Agricultural Engineering and Technological Research Center, College of Agronomy, Kunming University, Kunming, China
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Liu M, Bai M, Yue J, Fei X, Xia X. Integrating transcriptome and metabolome to explore the growth-promoting mechanisms of GABA in blueberry plantlets. FRONTIERS IN PLANT SCIENCE 2023; 14:1319700. [PMID: 38186593 PMCID: PMC10768180 DOI: 10.3389/fpls.2023.1319700] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/11/2023] [Accepted: 12/06/2023] [Indexed: 01/09/2024]
Abstract
Tissue culture technology is the main method for the commercial propagation of blueberry plants, but blueberry plantlets grow slowly and have long growth cycles under in vitro propagation, resulting in low propagation efficiency. In addition, the long culturing time can also result in reduced nutrient content in the culture medium, and the accumulation of toxic and harmful substances that can lead to weak growth for the plantlets or browning and vitrification, which ultimately can seriously reduce the quality of the plantlets. Gamma-aminobutyric acid (GABA) is a four-carbon non-protein amino acid that can improve plant resistance to various stresses and promote plant growth, but the effects of its application and mechanism in tissue culture are still unclear. In this study, the effects of GABA on the growth of in vitro blueberry plantlets were analyzed following the treatment of the plantlets with GABA. In addition, the GABA-treated plantlets were also subjected to a comparative transcriptomic and metabolomic analysis. The exogenous application of GABA significantly promoted growth and improved the quality of the blueberry plantlets. In total, 2,626 differentially expressed genes (DEGs) and 377 differentially accumulated metabolites (DAMs) were detected by comparison of the control and GABA-treated plantlets. Most of the DEGs and DAMs were involved in carbohydrate metabolism and biosynthesis of secondary metabolites. The comprehensive analysis results indicated that GABA may promote the growth of blueberry plantlets by promoting carbon metabolism and nitrogen assimilation, as well as increasing the accumulation of secondary metabolites such as flavonoids, steroids and terpenes.
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Affiliation(s)
| | | | | | | | - Xiuying Xia
- Plant Cell and Genetic Engineering Laboratory, School of Biological Engineering, Dalian University of Technology, Dalian, China
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11
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Hosseini M, Saidi A, Maali-Amiri R, Khosravi-Nejad F, Abbasi A. Low-temperature acclimation related with developmental regulations of polyamines and ethylene metabolism in wheat recombinant inbred lines. PLANT PHYSIOLOGY AND BIOCHEMISTRY : PPB 2023; 205:108198. [PMID: 38008007 DOI: 10.1016/j.plaphy.2023.108198] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/19/2023] [Revised: 10/22/2023] [Accepted: 11/13/2023] [Indexed: 11/28/2023]
Abstract
Winter survival is determined by complicated developmental regulations enabling wheat to adjust their transcriptome and metabolome to develop low temperature (LT) tolerance. The aim of the study was to clarify the metabolic responses developmentally regulated in six F6 recombinant inbred lines from a cross between Pishtaz (spring parent) and Mironovskaya 808 (winter parent). Spring genotypes, including pishtaz, RILs 4006 and 4014 showed lower LT tolerance, PAs (except the spermin), GABA and proline contents and DPPH• scavenging capacity. In these genotypes, genes and enzymes involved in the pathways of PAs and GABA degradation and ethylene biosynthesis were more active than other genotypes. RILs 4012 and 4016 with short vernalization displayed higher tolerance and lower H2O2 content compared to Pishtaz. Strong vernalization requirements in winter and facultative genotypes (Mironovskaya 808 parent and RILs 4003 and 4005) results in up-regulation of the metabolites and genes involved in PAs and GABA biosynthesis pathways (particularly when vernalization fulfillment occurred) to establish high tolerance as compared to genotypes without vernalization requirement. LT tolerance in all genotypes significantly decreased after vernalization fulfillment in February. Results indicated that LT tolerance was partly validated from developmental regulation of PAs, GABA, and ethylene metabolism during venalization and LT acclimation.
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Affiliation(s)
- Mohsen Hosseini
- Department of Plant Sciences and Biotechnology, Shahid Beheshti University, G.C, Tehran, Iran
| | - Abbas Saidi
- Department of Plant Sciences and Biotechnology, Shahid Beheshti University, G.C, Tehran, Iran.
| | - Reza Maali-Amiri
- Department of Agronomy and Plant Breeding, College of Agriculture and Natural Resources, University of Tehran, Karaj, 31587-77871, Iran.
| | | | - Amin Abbasi
- Department of Plant Production and Genetics, University of Maragheh, Maragheh, Iran
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Nehela Y, Killiny N. Gamma-Aminobutyric Acid Accumulation Contributes to Citrus sinensis Response against ' Candidatus Liberibacter Asiaticus' via Modulation of Multiple Metabolic Pathways and Redox Status. PLANTS (BASEL, SWITZERLAND) 2023; 12:3753. [PMID: 37960112 PMCID: PMC10650511 DOI: 10.3390/plants12213753] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/21/2023] [Revised: 10/30/2023] [Accepted: 10/31/2023] [Indexed: 11/15/2023]
Abstract
Huanglongbing (HLB; also known as citrus greening) is the most destructive bacterial disease of citrus worldwide with no known sustainable cure yet. Herein, we used non-targeted metabolomics and transcriptomics to prove that γ-aminobutyric acid (GABA) accumulation might influence the homeostasis of several metabolic pathways, as well as antioxidant defense machinery, and their metabolism-related genes. Overall, 41 metabolites were detected in 'Valencia' sweet orange (Citrus sinensis) leaf extract including 19 proteinogenic amino acids (PAA), 10 organic acids, 5 fatty acids, and 9 other amines (four phenolic amines and three non-PAA). Exogenous GABA application increased most PAA in healthy (except L-threonine, L-glutamine, L-glutamic acid, and L-methionine) and 'Candidatus L. asiaticus'-infected citrus plants (with no exception). Moreover, GABA accumulation significantly induced L-tryptophan, L-phenylalanine, and α-linolenic acid, the main precursors of auxins, salicylic acid (SA), and jasmonic acid (JA), respectively. Furthermore, GABA supplementation upregulated most, if not all, of amino acids, phenolic amines, phytohormone metabolism-related, and GABA shunt-associated genes in both healthy and 'Ca. L. asiaticus'-infected leaves. Moreover, although 'Ca. L. asiaticus' induced the accumulation of H2O2 and O2•- and generated strong oxidative stress in infected leaves, GABA possibly stimulates the activation of a multilayered antioxidative system to neutralize the deleterious effect of reactive oxygen species (ROS) and maintain redox status within infected leaves. This complex system comprises two major components: (i) the enzymatic antioxidant defense machinery (six POXs, four SODs, and CAT) that serves as the front line in antioxidant defenses, and (ii) the non-enzymatic antioxidant defense machinery (phenolic acids and phenolic amines) that works as a second defense line against 'Ca. L. asiaticus'-induced ROS in citrus infected leaves. Collectively, our findings suggest that GABA might be a promising alternative eco-friendly strategy that helps citrus trees battle HLB particularly, and other diseases in general.
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Affiliation(s)
- Yasser Nehela
- Department of Plant Pathology, Citrus Research and Education Center, University of Florida, 700 Experiment Station Rd., Lake Alfred, FL 33850, USA;
- Department of Agricultural Botany, Faculty of Agriculture, Tanta University, Tanta 31527, Egypt
| | - Nabil Killiny
- Department of Plant Pathology, Citrus Research and Education Center, University of Florida, 700 Experiment Station Rd., Lake Alfred, FL 33850, USA;
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Nehela Y, Killiny N. Gamma-Aminobutyric Acid Supplementation Boosts the Phytohormonal Profile in ' Candidatus Liberibacter asiaticus'-Infected Citrus. PLANTS (BASEL, SWITZERLAND) 2023; 12:3647. [PMID: 37896110 PMCID: PMC10609878 DOI: 10.3390/plants12203647] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/21/2023] [Revised: 10/17/2023] [Accepted: 10/18/2023] [Indexed: 10/29/2023]
Abstract
The devastating citrus disease, Huanglongbing (HLB), is associated with 'Candidatus Liberibacter sp.' and transmitted by citrus psyllids. Unfortunately, HLB has no known sustainable cure yet. Herein, we proposed γ-aminobutyric acid (GABA) as a potential eco-friendly therapeutic solution to HLB. Herein, we used GC/MS-based targeted metabolomics combined with gene expression to investigate the role of GABA in citrus response against HLB and to better understand its relationship(s) with different phytohormones. GABA supplementation via root drench boosts the accumulation of endogenous GABA in the leaves of both healthy and 'Ca. L. asiaticus'-infected trees. GABA accumulation benefits the activation of a multi-layered defensive system via modulating the phytohormone levels and regulating the expression of their biosynthesis genes and some pathogenesis-related proteins (PRs) in both healthy and 'Ca. L. asiaticus'-infected plants. Moreover, our findings showed that GABA application stimulates auxin biosynthesis in 'Ca. L. asiaticus'-infected plants via the activation of the indole-3-pyruvate (I3PA) pathway, not via the tryptamine (TAM)-dependent pathway, to enhance the growth of HLB-affected trees. Likewise, GABA accumulation was associated with the upregulation of SA biosynthesis genes, particularly the PAL-dependent route, resulting in higher SA levels that activated CsPR1, CsPR2, CsPR5, and CsWRKY70, which are prominent to activation of the SA-mediated pathway. Additionally, higher GABA levels were correlated with an enhanced JA profile and linked with both CsPR3 and CsPR4, which activates the JA-mediated pathway. Collectively, our findings suggest that exogenous GABA application might be a promising alternative and eco-friendly strategy that helps citrus trees battle HLB.
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Affiliation(s)
- Yasser Nehela
- Department of Plant Pathology, Citrus Research and Education Center, University of Florida, 700 Experiment Station Rd., Lake Alfred, FL 33850, USA;
- Department of Agricultural Botany, Faculty of Agriculture, Tanta University, Tanta 31527, Egypt
| | - Nabil Killiny
- Department of Plant Pathology, Citrus Research and Education Center, University of Florida, 700 Experiment Station Rd., Lake Alfred, FL 33850, USA;
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Li Y, Cui Y, Liu B, Xu R, Shi Y, Lv L, Wang H, Shang Y, Liang W, Ma F, Li C. γ-Aminobutyric acid plays a key role in alleviating Glomerella leaf spot in apples. MOLECULAR PLANT PATHOLOGY 2023; 24:588-601. [PMID: 36932866 DOI: 10.1111/mpp.13325] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/21/2022] [Revised: 02/28/2023] [Accepted: 03/01/2023] [Indexed: 05/18/2023]
Abstract
The fungal disease Glomerella leaf spot (GLS) seriously impacts apple production. As a nonprotein amino acid, γ-aminobutyric acid (GABA) is widely involved in biotic and abiotic stresses. However, it is not clear whether GABA is involved in a plant's response to GLS, nor is its molecular mechanism understood. Here, we found that exogenous GABA could significantly alleviate GLS, reduce lesion lengths, and increase antioxidant capacity. MdGAD1 was identified as a possible key gene for GABA synthesis in apple. Further analysis indicated that MdGAD1 promoted antioxidant capacity to improve apple GLS resistance in transgenic apple calli and leaves. Yeast one-hybrid analysis identified the transcription factor MdWRKY33 upstream of MdGAD1. Electrophoretic mobility shift assay, β-glucuronidase activity, and luciferase activity further supported that MdWRKY33 bound directly to the promoter of MdGAD1. The content of GABA and the transcription level of MdGAD1 in the MdWRKY33 transgenic calli were higher than that of the wild type. When MdWRKY33 transgenic calli and leaves were inoculated with GLS, MdWKRY33 positively regulated resistance to GLS. These results explained the positive regulatory effects of GABA on apple GLS and provided insight into the metabolic regulatory network of GABA.
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Affiliation(s)
- Yuxing Li
- State Key Laboratory of Crop Stress Biology for Arid Areas/Shaanxi Key Laboratory of Apple, College of Horticulture, Northwest A&F University, Yangling, China
| | - Yinglian Cui
- State Key Laboratory of Crop Stress Biology for Arid Areas/Shaanxi Key Laboratory of Apple, College of Horticulture, Northwest A&F University, Yangling, China
| | - Boyang Liu
- State Key Laboratory of Crop Stress Biology for Arid Areas/Shaanxi Key Laboratory of Apple, College of Horticulture, Northwest A&F University, Yangling, China
| | - Ruixuan Xu
- State Key Laboratory of Crop Stress Biology for Arid Areas/Shaanxi Key Laboratory of Apple, College of Horticulture, Northwest A&F University, Yangling, China
| | - Yanjiao Shi
- State Key Laboratory of Crop Stress Biology for Arid Areas/Shaanxi Key Laboratory of Apple, College of Horticulture, Northwest A&F University, Yangling, China
| | - Lingling Lv
- State Key Laboratory of Crop Stress Biology for Arid Areas/Shaanxi Key Laboratory of Apple, College of Horticulture, Northwest A&F University, Yangling, China
| | - Hongtao Wang
- State Key Laboratory of Crop Stress Biology for Arid Areas/Shaanxi Key Laboratory of Apple, College of Horticulture, Northwest A&F University, Yangling, China
| | - Yueming Shang
- State Key Laboratory of Crop Stress Biology for Arid Areas/Shaanxi Key Laboratory of Apple, College of Horticulture, Northwest A&F University, Yangling, China
| | - Wei Liang
- State Key Laboratory of Crop Stress Biology for Arid Areas/Shaanxi Key Laboratory of Apple, College of Horticulture, Northwest A&F University, Yangling, China
| | - Fengwang Ma
- State Key Laboratory of Crop Stress Biology for Arid Areas/Shaanxi Key Laboratory of Apple, College of Horticulture, Northwest A&F University, Yangling, China
| | - Cuiying Li
- State Key Laboratory of Crop Stress Biology for Arid Areas/Shaanxi Key Laboratory of Apple, College of Horticulture, Northwest A&F University, Yangling, China
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Lourkisti R, Antoine S, Pailly O, Luro F, Gibon Y, Oustric J, Santini J, Berti L. GABA shunt pathway is stimulated in response to early defoliation-induced carbohydrate limitation in Mandarin fruits. Heliyon 2023; 9:e15573. [PMID: 37128327 PMCID: PMC10148037 DOI: 10.1016/j.heliyon.2023.e15573] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2023] [Revised: 04/05/2023] [Accepted: 04/14/2023] [Indexed: 05/03/2023] Open
Abstract
The regulation of sugar and organic acid metabolism during fruit development has a major effect on high-quality fruit production. The reduction of leaf area is a common feature in plant growth, induced by abiotic and biotic stresses and disturbing source/sink ratio, thus impacting fruit quality. Here, we induced carbohydrate limitation by partial leaf defoliation at the beginning of the second stage of mandarin development (before the citrate peak). Resulting changes were monitored in the short-term (48 h and 1 week) and long-term (7 weeks) after the defoliation. Short-term response to early defoliation implied metabolic settings to re-feed TCA for sustaining respiration rate. These features involved (i) vacuolar sucrose degradation (high acid invertase activity and mRNA expression level) and enhanced glycolytic flux (high ATP-phosphofructokinase activity), (ii) malic and citric acid utilization (increased phosphoenolpyruvate kinase and NADP-Isocitrate dehydrogenase) associated with vacuolar citric acid release (high mRNA expression of the transporter CsCit1) and (iii) stimulation of GABA shunt pathway (low GABA content and increased mRNA expression of succinate semialdehyde dehydrogenase). A steady-state proline level was found in ED fruits although an increase in P5CS mRNA expression level. These results contribute to a better knowledge of the molecular basis of the relationship between defoliation and sugar and organic acid metabolism in mandarin fruit.
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Affiliation(s)
- Radia Lourkisti
- Unité mixte de recherche (UMR) 6134 Laboratoire Sciences pour l’Environnement (SPE) Centre national de la recherche scientifique (CNRS), Université de Corse, 20250, France
- Corresponding author.
| | - Sandrine Antoine
- Unité mixte de recherche (UMR) 6134 Laboratoire Sciences pour l’Environnement (SPE) Centre national de la recherche scientifique (CNRS), Université de Corse, 20250, France
- UMR AGAP Institut, CIRAD, INRAE, Institut Agro, Université Montpellier, 20230 San Giuliano, France
| | | | - François Luro
- UMR AGAP Institut, CIRAD, INRAE, Institut Agro, Université Montpellier, 20230 San Giuliano, France
| | - Yves Gibon
- UMR 1332 BFP, INRAE, Université de Bordeaux, 33883 Villenave d’Ornon, France
- MetaboHUB, Bordeaux Metabolome, INRAE, Université de Bordeaux, 33140 Villenave d’Ornon, France
| | - Julie Oustric
- Unité mixte de recherche (UMR) 6134 Laboratoire Sciences pour l’Environnement (SPE) Centre national de la recherche scientifique (CNRS), Université de Corse, 20250, France
| | - Jérémie Santini
- Unité mixte de recherche (UMR) 6134 Laboratoire Sciences pour l’Environnement (SPE) Centre national de la recherche scientifique (CNRS), Université de Corse, 20250, France
| | - Liliane Berti
- Unité mixte de recherche (UMR) 6134 Laboratoire Sciences pour l’Environnement (SPE) Centre national de la recherche scientifique (CNRS), Université de Corse, 20250, France
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Wang Y, Cao H, Wang S, Guo J, Dou H, Qiao J, Yang Q, Shao R, Wang H. Exogenous γ-aminobutyric acid (GABA) improves salt-inhibited nitrogen metabolism and the anaplerotic reaction of the tricarboxylic acid cycle by regulating GABA-shunt metabolism in maize seedlings. ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY 2023; 254:114756. [PMID: 36924595 DOI: 10.1016/j.ecoenv.2023.114756] [Citation(s) in RCA: 8] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/24/2022] [Revised: 12/10/2022] [Accepted: 03/07/2023] [Indexed: 06/18/2023]
Abstract
Salinity stress hampers the growth of most crop plants and reduces yield considerably. In addition to its role in metabolism, γ-aminobutyric acid (GABA) plays a special role in the regulation of salinity stress tolerance in plants, though the underlying physiological mechanism remains poorly understood. In order to study the physiological mechanism of GABA pathway regulated carbon and nitrogen metabolism and tis relationship with salt resistance of maize seedlings, we supplemented seedlings with exogenous GABA under salt stress. In this study, we showed that supplementation with 0.5 mmol·L-1 (0.052 mg·g-1) GABA alleviated salt toxicity in maize seedling leaves, ameliorated salt-induced oxidative stress, and increased antioxidant enzyme activity. Applying exogenous GABA maintained chloroplast structure and relieved chlorophyll degradation, thus improving the photosynthetic performance of the leaves. Due to the improvement in photosynthesis, sugar accumulation also increased. Endogenous GABA content and GABA transaminase (GABA-T) and succinate semialdehyde dehydrogenase (SSADH) activity were increased, while glutamate decarboxylase (GAD) activity was decreased, via the exogenous application of GABA under salt stress. Meanwhile, nitrogen metabolism and the tricarboxylic acid (TCA) cycle were activated by the supply of GABA. In general, through the regulation of GABA-shunt metabolism, GABA activated enzymes related to nitrogen metabolism and replenished the key substrates of the TCA cycle, thereby improving the balance of carbon and nitrogen metabolism of maize and improving salt tolerance.
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Affiliation(s)
- Yongchao Wang
- College of Agronomy, Henan Agricultural University, Zhengzhou 450046, China; Henan Engineering Research Center of crop Chemical Control, Zhengzhou 450046, China
| | - Hongzhang Cao
- College of Agronomy, Henan Agricultural University, Zhengzhou 450046, China
| | - Shancong Wang
- College of Agronomy, Henan Agricultural University, Zhengzhou 450046, China
| | - Jiameng Guo
- College of Agronomy, Henan Agricultural University, Zhengzhou 450046, China; Henan Engineering Research Center of crop Chemical Control, Zhengzhou 450046, China
| | - Hangyu Dou
- College of Agronomy, Henan Agricultural University, Zhengzhou 450046, China
| | - Jiangfang Qiao
- Cereal Institute, Henan Academy of Agricultural Sciences, Zhengzhou 450099, China
| | - Qinghua Yang
- College of Agronomy, Henan Agricultural University, Zhengzhou 450046, China; Henan Engineering Research Center of crop Chemical Control, Zhengzhou 450046, China
| | - Ruixin Shao
- College of Agronomy, Henan Agricultural University, Zhengzhou 450046, China; Henan Engineering Research Center of crop Chemical Control, Zhengzhou 450046, China.
| | - Hao Wang
- College of Agronomy, Henan Agricultural University, Zhengzhou 450046, China; Henan Engineering Research Center of crop Chemical Control, Zhengzhou 450046, China.
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Ullah A, Ali I, Noor J, Zeng F, Bawazeer S, Eldin SM, Asghar MA, Javed HH, Saleem K, Ullah S, Ali H. Exogenous γ-aminobutyric acid (GABA) mitigated salinity-induced impairments in mungbean plants by regulating their nitrogen metabolism and antioxidant potential. FRONTIERS IN PLANT SCIENCE 2023; 13:1081188. [PMID: 36743556 PMCID: PMC9897288 DOI: 10.3389/fpls.2022.1081188] [Citation(s) in RCA: 9] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/27/2022] [Accepted: 12/23/2022] [Indexed: 06/18/2023]
Abstract
BACKGROUND Increasing soil salinization has a detrimental effect on agricultural productivity.Therefore, strategies are needed to induce salinity-tolerance in crop species for sustainable foodproduction. γ-aminobutyric acid (GABA) plays a key role in regulating plant salinity stresstolerance. However, it remains largely unknown how mungbean plants (Vigna radiata L.) respondto exogenous GABA under salinity stress. METHODS Thus, we evaluated the effect of exogenous GABA (1.5 mM) on the growth and physiobiochemicalresponse mechanism of mungbean plants to saline stress (0-, 50-, and 100 mM [NaCland Na2SO4, at a 1:1 molar ratio]). RESULTS Increased saline stress adversely affected mungbean plants' growth and metabolism. Forinstance, leaf-stem-root biomass (34- and 56%, 31- and 53%, and 27- and 56% under 50- and 100mM, respectively]) and chlorophyll concentrations declined. The carotenoid level increased (10%)at 50 mM and remained unaffected at 100 mM. Hydrogen peroxide (H2O2), malondialdehyde(MDA), osmolytes (soluble sugars, soluble proteins, proline), total phenolic content, andenzymatic activities of superoxide dismutase (SOD), ascorbate peroxidase (APX), peroxidase(POD), glutathione reductase (GTR), and polyphenol oxidation (PPO) were significantlyincreased. In leaves, salinity caused a significant increase in Na+ concentration but a decrease inK+ concentration, resulting in a low K+/Na+ concentration (51- and 71% under 50- and 100- mMstress). Additionally, nitrogen concentration and the activities of nitrate reductase (NR) andglutamine synthetase (GS) decreased significantly. The reduction in glutamate synthase (GOGAT)activity was only significant (65%) at 100 mM stress. Exogenous GABA decreased Na+, H2O2,and MDA concentrations but enhanced photosynthetic pigments, K+ and K+/Na+ ratio, Nmetabolism, osmolytes, and enzymatic antioxidant activities, thus reducing salinity-associatedstress damages, resulting in improved growth and biomass. CONCLUSION Exogenous GABA may have improved the salinity tolerance of mungbean plants by maintaining their morpho-physiological responses and reducing the accumulation of harmfulsubstances under salinity. Future molecular studies can contribute to a better understanding of themolecular mechanisms by which GABA regulates mungbean salinity tolerance.
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Affiliation(s)
- Abd Ullah
- Xinjiang Key Laboratory of Desert Plant Root Ecology and Vegetation Restoration, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi, China
- Cele National Station of Observation and Research for Desert-Grassland Ecosystems, Cele, China
- University of Chinese Academy of Sciences, Beijing, China
| | - Iftikhar Ali
- Center for Plant Sciences and Biodiversity, University of Swat, Charbagh Swat, Pakistan
- Department of Genetics and Development, Columbia University Irving Medical Center, New York, NY, United States
| | - Javaria Noor
- Department of Botany, Islamia College University, Peshawar, Pakistan
| | - Fanjiang Zeng
- Xinjiang Key Laboratory of Desert Plant Root Ecology and Vegetation Restoration, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi, China
- Cele National Station of Observation and Research for Desert-Grassland Ecosystems, Cele, China
- University of Chinese Academy of Sciences, Beijing, China
| | - Sami Bawazeer
- Umm Al-Qura University, Faculty of Pharmacy, Department of Pharmacognosy, Makkah, Saudi Arabia
| | - Sayed M Eldin
- Center of Research, Faculty of Engineering, Future University in Egypt, New Cairo, Egypt
| | - Muhammad Ahsan Asghar
- Department of Biological Resources, Agricultural Institute, Centre for Agricultural Research, ELKH, 2 Brunszvik St. Martonvásár, Hungary
| | | | - Khansa Saleem
- Department of Horticultural Sciences, The Islamia University of Bahawalpur, Bahawalpur, Pakistan
| | - Sami Ullah
- Department of Botany, University of Peshawar, Peshawar, Pakistan
| | - Haider Ali
- Center for Plant Sciences and Biodiversity, University of Swat, Charbagh Swat, Pakistan
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Wang G, Zhang L, Zhang S, Li B, Li J, Wang X, Zhang J, Guan C, Ji J. The combined use of a plant growth promoting Bacillus sp. strain and GABA promotes the growth of rice under salt stress by regulating antioxidant enzyme system, enhancing photosynthesis and improving soil enzyme activities. Microbiol Res 2023; 266:127225. [DOI: 10.1016/j.micres.2022.127225] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2022] [Revised: 09/16/2022] [Accepted: 10/06/2022] [Indexed: 11/05/2022]
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Pei L, Zhao Y, Shi X, Chen R, Yan J, Li X, Jiang Z, Wang J, Shi S. The Role of γ-Aminobutyric Acid (GABA) in the Occurrence of Adventitious Roots and Somatic Embryos in Woody Plants. PLANTS (BASEL, SWITZERLAND) 2022; 11:3512. [PMID: 36559624 PMCID: PMC9784130 DOI: 10.3390/plants11243512] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 09/13/2022] [Revised: 12/08/2022] [Accepted: 12/09/2022] [Indexed: 06/17/2023]
Abstract
The occurrence of adventitious roots and somatic embryos is a crucial step in micropropagation that frequently limits the application of this technique in woody plants. Recent studies demonstrated that they can be negatively or positively regulated with γ-aminobutyric acid (GABA), which is a four-carbon non-proteinous amino acid that not only acts as a main inhibitory neurotransmitter in mammals. It has been reported that GABA affects plant growth and their response to stress although its mode of action is still unclear. This review dealt with the effects of GABA on adventitious root formation and growth as well as on somatic embryogenesis. Furthermore, we focused on discussing the interaction of GABA with phytohormones, such as auxin, ethylene, abscisic acid, and gibberellin, as well as with the carbon and nitrogen metabolism during adventitious root development. We suggested that research on GABA will contribute to the application of micropropagation in the recalcitrant fruit and forest species.
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Affiliation(s)
- Lu Pei
- State Key Laboratory of Tree Genetics and Breeding, Research Institute of Forestry, The Chinese Academy of Forestry, Beijing 100091, China
| | - Yue Zhao
- State Key Laboratory of Tree Genetics and Breeding, Research Institute of Forestry, The Chinese Academy of Forestry, Beijing 100091, China
| | - Xinru Shi
- State Key Laboratory of Tree Genetics and Breeding, Research Institute of Forestry, The Chinese Academy of Forestry, Beijing 100091, China
| | - Rongrong Chen
- State Key Laboratory of Tree Genetics and Breeding, Research Institute of Forestry, The Chinese Academy of Forestry, Beijing 100091, China
| | - Jiawei Yan
- State Key Laboratory of Tree Genetics and Breeding, Research Institute of Forestry, The Chinese Academy of Forestry, Beijing 100091, China
| | - Xu Li
- College of Biological and Environmental Sciences, Zhejiang Wanli University, Ningbo 315100, China
| | - Zeping Jiang
- Key Laboratory of Forest Ecology and Environment of National Forestry and Grassland Administration, Research Institute of Forest Ecology, Environment and Protection, The Chinese Academy of Forestry, Beijing 100091, China
| | - Junhui Wang
- State Key Laboratory of Tree Genetics and Breeding, Research Institute of Forestry, The Chinese Academy of Forestry, Beijing 100091, China
| | - Shengqing Shi
- State Key Laboratory of Tree Genetics and Breeding, Research Institute of Forestry, The Chinese Academy of Forestry, Beijing 100091, China
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Hao D, Lang B, Wang Y, Wang X, Liu T, Chen J. Designing synthetic consortia of Trichoderma strains that improve antagonistic activities against pathogens and cucumber seedling growth. Microb Cell Fact 2022; 21:234. [PMID: 36368978 PMCID: PMC9652886 DOI: 10.1186/s12934-022-01959-2] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2022] [Accepted: 10/23/2022] [Indexed: 11/13/2022] Open
Abstract
Background Trichoderma spp. are important agricultural biocontrol microorganisms that are often used as effective components of microbial fungicides and microbial biofertilizers. However, most of these products are prepared by a single strain in monoculture, which significantly limits the biocontrol efficiency and stability of Trichoderma products. Therefore, the establishment of a design and screening approach for consortia with multi-Trichoderma strains for co-culture is of great importance to overcome the shortage of traditional Trichoderma biocontrol products. Results First, 15 Trichoderma strains were screened in terms of mycelium growth rate, antagonistic activity to a variety of pathogens, stress tolerance to high temperature and salt stress, and cucumber seedling growth promotion level. Then, the combinations of Trichoderma asperellum GDSF1009 (CGMCC NO. 9512), Trichoderma asperelloides Z4-1 (CGMCC NO. 40245), Trichoderma harzianum 10569 (CGMCC NO. 40246), and T. asperellum 10264 (CGMCC NO. 22404) were finally screened as an optimal consortium for co-culture underlying the levels of plant growth-promoting and antagonistic activity to Fusarium oxysporum and seed germination promotion relative to the monoculture of a single strain. Consortia with multiple co-cultured strains were found to generate larger amounts of free amino acids than those from the monoculture of a single strain, and a pot assay also indicated that metabolites of co-cultures were able to promote cucumber seedling growth superior to that with monoculture of a single strain, even though the promotion was better than from simply mixed cultures from each of the four Trichoderma strains. Taken together, the co-culture consortia composed of the four compatible interactive Trichoderma strains was a potential novel multiple strain biocontrol agent based on the combination of synthetic consortia design and co-culture. In the field experiment, we found that the growth-promoting effect of the co-culture fermentation filtrate was better than that of the single culture fermentation filtrate. Compared with T-Z4-1, T-1009, T-10264 and T-10569, the plant height of cucumber was increased by 22.99%, 42.06%, 24.18% and 30.09%, respectively, and the stem diameter was increased by 16.59%, 18.83%, 13.65% and 14.70%, respectively. Conclusion An approach to designing and screening Trichoderma consortia for co-culture was established. The consortia co-culture presented a better performance in antagonistic activity and cucumber growth compared with a monoculture of a single strain. Thus, it is of great significance to lay the foundation for the creation of a novel Trichoderma biofungicide or biomanure to resist cucumber Fusarium wilt and promote cucumber growth. Supplementary Information The online version contains supplementary material available at 10.1186/s12934-022-01959-2.
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Li LQ, Chen J, Lu YF, Ren B, Huang XL, Yu LP, Zeng FC, Wang Q, Wang XY, Lu LM. Physiological and proteomic analyses of γ-aminobutyric acid (GABA)-treated tubers reveals that StPOD42 promotes sprouting in potato. JOURNAL OF PLANT PHYSIOLOGY 2022; 278:153826. [PMID: 36179397 DOI: 10.1016/j.jplph.2022.153826] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/29/2022] [Revised: 09/20/2022] [Accepted: 09/20/2022] [Indexed: 06/16/2023]
Abstract
Gamma-aminobutyric acid (GABA) is a nonproteinogenic amino acid that plays vital roles in plant growth and developmental processes. However, its role in regulating potato sprouting is unknown. Therefore, the physiological and molecular mechanisms underlying the sprouting process were assessed, and we found that GABA promoted sprouting after treatment for 50 d. In addition, the GABA and soluble sugar contents increased while the starch content decreased. To study the molecular mechanism by which exogenous GABA accelerates tuber sprouting, comparative proteomic analysis of tuber bud eyes was performed after GABA treatment for 48 h. Further analysis revealed 316 differentially abundant proteins (DAPs) that are mainly involved in fatty acid and sugar metabolism and cutin, suberin and wax biosyntheses. The qRT‒PCR results suggested that the GABA transaminase 2 (GABA-T2) and GABA-T3 expression levels showed the greatest decrease at 30 d of storage. Peroxidase 42 (StPOD42) expression showed the greatest increase at 30 d. Overexpression of StPOD42 in potato was found to promote tuber sprouting. Our results provide new insights into the role of GABA in regulating the sprouting process and indicate that StPOD42 is a target gene for molecular breeding to modulate potato sprouting.
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Affiliation(s)
- Li Qin Li
- State Key Laboratory of Crop Gene Exploration and Utilization in Southwest China, Sichuan Agricultural University, Chengdu, 611130, China; College of Agronomy, Sichuan Agriculture University, Chengdu, 611130, China.
| | - Jing Chen
- State Key Laboratory of Crop Gene Exploration and Utilization in Southwest China, Sichuan Agricultural University, Chengdu, 611130, China; College of Agronomy, Sichuan Agriculture University, Chengdu, 611130, China
| | - Yi Fei Lu
- State Key Laboratory of Crop Gene Exploration and Utilization in Southwest China, Sichuan Agricultural University, Chengdu, 611130, China; College of Agronomy, Sichuan Agriculture University, Chengdu, 611130, China
| | - Bi Ren
- State Key Laboratory of Crop Gene Exploration and Utilization in Southwest China, Sichuan Agricultural University, Chengdu, 611130, China; College of Agronomy, Sichuan Agriculture University, Chengdu, 611130, China
| | - Xue Li Huang
- State Key Laboratory of Crop Gene Exploration and Utilization in Southwest China, Sichuan Agricultural University, Chengdu, 611130, China; College of Agronomy, Sichuan Agriculture University, Chengdu, 611130, China
| | - Li Ping Yu
- State Key Laboratory of Crop Gene Exploration and Utilization in Southwest China, Sichuan Agricultural University, Chengdu, 611130, China; College of Agronomy, Sichuan Agriculture University, Chengdu, 611130, China
| | - Fu Chun Zeng
- State Key Laboratory of Crop Gene Exploration and Utilization in Southwest China, Sichuan Agricultural University, Chengdu, 611130, China; College of Agronomy, Sichuan Agriculture University, Chengdu, 611130, China
| | - Qiang Wang
- State Key Laboratory of Crop Gene Exploration and Utilization in Southwest China, Sichuan Agricultural University, Chengdu, 611130, China; College of Agronomy, Sichuan Agriculture University, Chengdu, 611130, China
| | - Xi Yao Wang
- State Key Laboratory of Crop Gene Exploration and Utilization in Southwest China, Sichuan Agricultural University, Chengdu, 611130, China; College of Agronomy, Sichuan Agriculture University, Chengdu, 611130, China
| | - Li Ming Lu
- State Key Laboratory of Crop Gene Exploration and Utilization in Southwest China, Sichuan Agricultural University, Chengdu, 611130, China; College of Agronomy, Sichuan Agriculture University, Chengdu, 611130, China.
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Shan Q, Liu M, Li R, Shi Q, Li Y, Gong B. γ-Aminobutyric acid (GABA) improves pesticide detoxification in plants. THE SCIENCE OF THE TOTAL ENVIRONMENT 2022; 835:155404. [PMID: 35469890 DOI: 10.1016/j.scitotenv.2022.155404] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/18/2022] [Revised: 04/15/2022] [Accepted: 04/16/2022] [Indexed: 06/14/2023]
Abstract
It is important to ensure food safety to study the technology and mechanism of pesticide residues degradation in crops. Though γ-aminobutyric acid (GABA) has been widely reported to involve in plant stress resistance, whether exogenous application or endogenous regulation of GABA by gene-editing technology can promote the pesticide detoxification is not clear in plants. Using tomato and chlorothalonil (CHT) as research models, we discovered that exogenous application of GABA or endogenous elevation of GABA by knockout of pyruvate-dependent GABA transaminase promoted both CHT metabolism and plant stress tolerance to CHT. This is closely related to the active adaptation of GABA to CHT stress by regulating the plant GABA shunt pathway and polyamine pathway. The transcriptome data revealed 17 target genes that may be closely related to the involvement of GABA in CHT metabolism, including 4 peroxidases, 5 glycosyltransferases, 4 glutathione S-transferases, and 4 ABC transporters. In addition, the glutathione detoxification pathway and antioxidative enzyme also actively participated in the GABA-induced CHT detoxification process, which played an important role in relieving CHT stress. As a result, GABA significantly increased the photosynthetic capacity of tomato leaves under CHT stress. While studying photosynthesis, we unexpectedly found that GABA promotes stomatal closure in terms of decreased stomatal conductance and stomatal diameter. This result implies that GABA can reduce CHT absorption by regulating stomatal movement in leaves. Together, we provided a novel viewpoint that foliar application of GABA or metabolic engineering of GABA is an effective approach to reduce the risk of pesticide contamination in crop production.
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Affiliation(s)
- Qing Shan
- State Key Laboratory of Crop Biology/Key Laboratory of Horticultural Crop Biology and Germplasm Innovation, Ministry of Agriculture/College of Horticulture Science and Engineering, Shandong Agricultural University, Tai'an 271018, China
| | - Minghui Liu
- State Key Laboratory of Crop Biology/Key Laboratory of Horticultural Crop Biology and Germplasm Innovation, Ministry of Agriculture/College of Horticulture Science and Engineering, Shandong Agricultural University, Tai'an 271018, China
| | - Rui Li
- The College of Food Science and Nutritional Engineering, China Agricultural University, Beijing 100083, China
| | - Qinghua Shi
- State Key Laboratory of Crop Biology/Key Laboratory of Horticultural Crop Biology and Germplasm Innovation, Ministry of Agriculture/College of Horticulture Science and Engineering, Shandong Agricultural University, Tai'an 271018, China
| | - Yan Li
- Shandong Academy of Agricultural Sciences, Jinan 250100, China.
| | - Biao Gong
- State Key Laboratory of Crop Biology/Key Laboratory of Horticultural Crop Biology and Germplasm Innovation, Ministry of Agriculture/College of Horticulture Science and Engineering, Shandong Agricultural University, Tai'an 271018, China.
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Ashraf U, Mahmood S, Anjum SA, Abbas RN, Rasul F, Iqbal J, Mo Z, Tang X. Exogenous Gamma-Aminobutyric Acid Application Induced Modulations in the Performance of Aromatic Rice Under Lead Toxicity. FRONTIERS IN PLANT SCIENCE 2022; 13:933694. [PMID: 35958207 PMCID: PMC9361023 DOI: 10.3389/fpls.2022.933694] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 05/01/2022] [Accepted: 06/22/2022] [Indexed: 06/15/2023]
Abstract
Gamma-aminobutyric acid (GABA) is a non-protein amino acid and has a multi-functional role in abiotic stress tolerance. A pot experiment was conducted to assess the role of exogenous gamma-aminobutyric acid (GABA) application to modulate the growth, yield, and related physio-biochemical mechanisms in two aromatic rice cultivars, that is, Guixiangzhan (GXZ) and Nongxiang 18 (NX-18), under Pb toxic and normal conditions. The experimental treatments were comprised of Ck: without Pb and GABA (control), GABA: 1 mM GABA is applied under normal conditions (without Pb), Pb + GABA: 1 mM GABA is applied under Pb toxicity (800 mg kg-1 of soil), and Pb= only Pb (800 mg kg-1 of soil) is applied (no GABA). The required concentrations of GABA were applied as a foliar spray. Results revealed that Pb stress induced oxidative damage in terms of enhanced malondialdehyde (MDA), electrolyte leakage (EL), and H2O2 contents, while exogenous GABA application improved leaf chlorophyll, proline, protein and GABA contents, photosynthesis and gas exchange, and antioxidant defense under Pb toxicity in both rice cultivars. Moreover, glutamine synthetase (GS) and nitrate reductase (NR) activities were variably affected due to GABA application under Pb stress. The yield and related traits, that is, productive tillers/pot, grains/panicle, filled grain %, 1,000-grain weight, and grain yield were 13.64 and 10.29, 0.37% and 2.26%, 3.89 and 19.06%, 7.35 and 12.84%, and 17.92 and 40.56 lower under Pb treatment than Pb + GABA for GXZ and NX-18, respectively. Furthermore, exogenous GABA application in rice reduced Pb contents in shoot, leaves, panicle, and grains compared with Pb-exposed plants without GABA. Overall, GXZ performed better than NX-18 under Pb toxic conditions.
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Affiliation(s)
- Umair Ashraf
- Department of Botany, Division of Science and Technology, University of Education, Lahore, Pakistan
- Department of Crop Science and Technology, College of Agriculture, South China Agricultural University, Guangzhou, China
| | - Sammina Mahmood
- Department of Botany, Division of Science and Technology, University of Education, Lahore, Pakistan
| | | | - Rana Nadeem Abbas
- Department of Agronomy, University of Agriculture, Faisalabad, Pakistan
| | - Fahd Rasul
- Department of Agronomy, University of Agriculture, Faisalabad, Pakistan
| | - Javed Iqbal
- Department of Agricultural Engineering, Khawaja Fareed University of Engineering and Information Technology, Rahim Yar Khan, Pakistan
| | - Zhaowen Mo
- Department of Crop Science and Technology, College of Agriculture, South China Agricultural University, Guangzhou, China
- State Key Laboratory for Conservation and Utilization of Subtropical Agro-bioresources, College of Agriculture, South China Agricultural University, Guangzhou, China
| | - Xiangru Tang
- Department of Crop Science and Technology, College of Agriculture, South China Agricultural University, Guangzhou, China
- State Key Laboratory for Conservation and Utilization of Subtropical Agro-bioresources, College of Agriculture, South China Agricultural University, Guangzhou, China
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Zhang G, Yan Y, Zeng X, Wang Y, Zhang Y. Quantitative Proteomics Analysis Reveals Proteins Associated with High Melatonin Content in Barley Seeds under NaCl-Induced Salt Stress. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2022; 70:8492-8510. [PMID: 35759742 DOI: 10.1021/acs.jafc.2c00466] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
Soil salinization limits hull-less barley cultivation in the Qinghai-Tibet Plateau of China. However, some wild hull-less barley seeds accumulate high melatonin (MEL) during germination with improved salt tolerance; but the mechanism of melatonin-mediated salt tolerance in hull-less barley is not well understood at the protein level. This study investigated proteome changes resulting in high melatonin content in germinating hull-less barley seeds under high saline conditions. The proteome profiles of seed treatment with 240 mM-NaCl (N), water (H), and control (C) taken 7 days after germination were compared using the TMT-based quantitative proteomics. Our results indicate that salt stress-induced global changes in the proteomes of germinating hull-less barley seeds, altering the expression and abundance of proteins related to cell cycle and control, carbohydrate and energy metabolism, and amino acid transport and metabolism including proteins related to melatonin production. Furthermore, proteins associated with cellular redox homeostasis, osmotic stress response, and secondary metabolites derived primarily from amino acid metabolism, purine degradation, and shikimate pathways increased significantly in abundance and may contribute to the high melatonin content in seeds under salt stress. Consequently, triggering the robust response to oxidative stress occasioned by the NaCl-induced salt stress, improved seed germination and strong adaptation to salt stress.
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Affiliation(s)
- Guoqiang Zhang
- College of Biological and Food Engineering, Anhui Polytechnic University, Wuhu, Anhui 241000, China
- Tibet Academy of Agricultural and Animal Husbandry Sciences, Lhasa, Tibet 850002, China
| | - Yingying Yan
- Institute of Agricultural Products Processing & Food Science, Tibet Academy of Agricultural and Animal Husbandry Sciences, Lhasa, Tibet 850002, China
| | - Xingquan Zeng
- Tibet Academy of Agricultural and Animal Husbandry Sciences, Lhasa, Tibet 850002, China
| | - Yulin Wang
- Tibet Academy of Agricultural and Animal Husbandry Sciences, Lhasa, Tibet 850002, China
| | - Yuhong Zhang
- Institute of Agricultural Products Processing & Food Science, Tibet Academy of Agricultural and Animal Husbandry Sciences, Lhasa, Tibet 850002, China
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25
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Synthesis of γ-Aminobutyric Acid-Modified Chitooligosaccharide Derivative and Enhancing Salt Resistance of Wheat Seedlings. MOLECULES (BASEL, SWITZERLAND) 2022; 27:molecules27103068. [PMID: 35630540 PMCID: PMC9143915 DOI: 10.3390/molecules27103068] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/17/2022] [Revised: 05/02/2022] [Accepted: 05/06/2022] [Indexed: 11/17/2022]
Abstract
Salinity is one of the major abiotic stresses limiting crop growth and productivity worldwide. Salt stress during germination degenerates crop establishment and declines yield in wheat, therefore alleviating the damage of salt stress to wheat seedlings is crucial. Chitooligosaccharide (COS) was grafted with γ-aminobutyric acid based on the idea of bioactive molecular splicing, and the differences in salt resistance before and after grafting were compared. The expected derivative was successfully synthesized and exhibited better salt resistance-inducing activity than the raw materials. By activating antioxidant enzymes such as superoxide dismutases (SOD), catalase (CAT) and phenylalanine ammonia-lyase (PAL) and subsequently eliminating reactive oxygen species (ROS) in a timely manner, the rate of O−2 production and H2O2 content of wheat seedlings were reduced, and the dynamic balance of free radical metabolism in the plant body was maintained. A significantly reduced MDA content, reduced relative permeability of the cell membrane, and decreased degree of damage to the cell membrane were observed. A significant increase in the content of soluble sugar, maintenance of osmotic regulation and the stability of the cell membrane structure, effective reduction in the salt stress-induced damage to wheat, and the induction of wheat seedling growth were also observed, thereby improving the salt tolerance of wheat seedlings.
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Balfagón D, Gómez-Cadenas A, Rambla JL, Granell A, de Ollas C, Bassham DC, Mittler R, Zandalinas SI. γ-Aminobutyric acid plays a key role in plant acclimation to a combination of high light and heat stress. PLANT PHYSIOLOGY 2022; 188:2026-2038. [PMID: 35078231 PMCID: PMC8968390 DOI: 10.1093/plphys/kiac010] [Citation(s) in RCA: 19] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/10/2021] [Accepted: 11/30/2021] [Indexed: 05/29/2023]
Abstract
Plants are frequently subjected to different combinations of abiotic stresses, such as high light (HL) intensity, and elevated temperatures. These environmental conditions pose a threat to agriculture production, affecting photosynthesis, and decreasing yield. Metabolic responses of plants, such as alterations in carbohydrates and amino acid fluxes, play a key role in the successful acclimation of plants to different abiotic stresses, directing resources toward stress responses, and suppressing growth. Here we show that the primary metabolic response of Arabidopsis (Arabidopsis thaliana) plants to HL or heat stress (HS) is different from that of plants subjected to a combination of HL and HS (HL+HS). We further demonstrate that the combined stress results in a unique metabolic response that includes increased accumulation of sugars and amino acids coupled with decreased levels of metabolites participating in the tricarboxylic acid cycle. Among the amino acids exclusively accumulated during HL+HS, we identified the nonproteinogenic amino acid γ-aminobutyric acid (GABA). Analysis of different mutants deficient in GABA biosynthesis (GLUTAMATE DESCARBOXYLASE 3 [gad3]) as well as mutants impaired in autophagy (autophagy-related proteins 5 and 9 [atg5 and atg9]), revealed that GABA plays a key role in the acclimation of plants to HL+HS, potentially by promoting autophagy. Taken together, our findings identify a role for GABA in regulating plant responses to combined stress.
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Affiliation(s)
- Damián Balfagón
- Departamento de Ciencias Agrarias y del Medio Natural, Universitat Jaume I, Castelló de la Plana, 12071, Spain
| | - Aurelio Gómez-Cadenas
- Departamento de Ciencias Agrarias y del Medio Natural, Universitat Jaume I, Castelló de la Plana, 12071, Spain
| | - José L Rambla
- Departamento de Ciencias Agrarias y del Medio Natural, Universitat Jaume I, Castelló de la Plana, 12071, Spain
| | - Antonio Granell
- Instituto de Biología Molecular y Celular de Plantas, CSIC-Universidad Politécnica de Valencia, Valencia 46022, Spain
| | - Carlos de Ollas
- Departamento de Ciencias Agrarias y del Medio Natural, Universitat Jaume I, Castelló de la Plana, 12071, Spain
| | - Diane C Bassham
- Department of Genetics, Development and Cell Biology, Iowa State University, Ames, Iowa 50011, USA
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Zhang M, Liu Z, Fan Y, Liu C, Wang H, Li Y, Xin Y, Gai Y, Ji X. Characterization of GABA-Transaminase Gene from Mulberry ( Morus multicaulis) and Its Role in Salt Stress Tolerance. Genes (Basel) 2022; 13:501. [PMID: 35328056 PMCID: PMC8954524 DOI: 10.3390/genes13030501] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2022] [Revised: 03/09/2022] [Accepted: 03/10/2022] [Indexed: 11/16/2022] Open
Abstract
Gamma-aminobutyric acid (GABA) has been reported to accumulate in plants when subjected to salt stress, and GABA-transaminase (GABA-T) is the main GABA-degrading enzyme in the GABA shunt pathway. So far, the salt tolerance mechanism of the GABA-T gene behind the GABA metabolism remains unclear. In this study, the cDNA (designated MuGABA-T) of GABA-T gene was cloned from mulberry, and our data showed that MuGABA-T protein shares some conserved characteristics with its homologs from several plant species. MuGABA-T gene was constitutively expressed at different levels in mulberry tissues, and was induced substantially by NaCl, ABA and SA. In addition, our results demonstrated that exogenous application of GABA significantly reduced the salt damage index and increased plant resistance to NaCl stress. We further performed a functional analysis of MuGABA-T gene and demonstrated that the content of GABA was reduced in the transgenic MuGABA-T Arabidopsis plants, which accumulated more ROS and exhibited more sensitivity to salt stress than wild-type plants. However, exogenous application of GABA significantly increased the activities of antioxidant enzymes and alleviated the active oxygen-related injury of the transgenic plants under NaCl stress. Moreover, the MuGABA-T gene was overexpressed in the mulberry hairy roots, and similar results were obtained for sensitivity to salt stress in the transgenic mulberry plants. Our results suggest that the MuGABA-T gene plays a pivotal role in GABA catabolism and is responsible for a decrease in salt tolerance, and it may be involved in the ROS pathway in the response to salt stress. Taken together, the information provided here is helpful for further analysis of the function of GABA-T genes, and may promote mulberry resistance breeding in the future.
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Affiliation(s)
- Mengru Zhang
- State Key Laboratory of Crop Biology, Shandong Agricultural University, Taian 271018, China; (M.Z.); (Y.F.)
- College of Forestry, Shandong Agricultural University, Taian 271018, China; (Z.L.); (C.L.); (H.W.); (Y.L.); (Y.X.)
| | - Zhaoyang Liu
- College of Forestry, Shandong Agricultural University, Taian 271018, China; (Z.L.); (C.L.); (H.W.); (Y.L.); (Y.X.)
| | - Yiting Fan
- State Key Laboratory of Crop Biology, Shandong Agricultural University, Taian 271018, China; (M.Z.); (Y.F.)
| | - Chaorui Liu
- College of Forestry, Shandong Agricultural University, Taian 271018, China; (Z.L.); (C.L.); (H.W.); (Y.L.); (Y.X.)
| | - Hairui Wang
- College of Forestry, Shandong Agricultural University, Taian 271018, China; (Z.L.); (C.L.); (H.W.); (Y.L.); (Y.X.)
| | - Yan Li
- College of Forestry, Shandong Agricultural University, Taian 271018, China; (Z.L.); (C.L.); (H.W.); (Y.L.); (Y.X.)
| | - Youchao Xin
- College of Forestry, Shandong Agricultural University, Taian 271018, China; (Z.L.); (C.L.); (H.W.); (Y.L.); (Y.X.)
| | - Yingping Gai
- State Key Laboratory of Crop Biology, Shandong Agricultural University, Taian 271018, China; (M.Z.); (Y.F.)
| | - Xianling Ji
- College of Forestry, Shandong Agricultural University, Taian 271018, China; (Z.L.); (C.L.); (H.W.); (Y.L.); (Y.X.)
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Wang Q, Wang B, Liu H, Han H, Zhuang H, Wang J, Yang T, Wang H, Qin Y. Comparative proteomic analysis for revealing the advantage mechanisms of salt-tolerant tomato ( Solanum lycoperscium). PeerJ 2022; 10:e12955. [PMID: 35251781 PMCID: PMC8893030 DOI: 10.7717/peerj.12955] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2021] [Accepted: 01/27/2022] [Indexed: 01/11/2023] Open
Abstract
Salt stress causes the quality change and significant yield loss of tomato. However, the resources of salt-resistant tomato were still deficient and the mechanisms of tomato resistance to salt stress were still unclear. In this study, the proteomic profiles of two salt-tolerant and salt-sensitive tomato cultivars were investigated to decipher the salt-resistance mechanism of tomato and provide novel resources for tomato breeding. We found high abundance proteins related to nitrate and amino acids metabolismsin the salt-tolerant cultivars. The significant increase in abundance of proteins involved in Brassinolides and GABA biosynthesis were verified in salt-tolerant cultivars, strengthening the salt resistance of tomato. Meanwhile, salt-tolerant cultivars with higher abundance and activity of antioxidant-related proteins have more advantages in dealing with reactive oxygen species caused by salt stress. Moreover, the salt-tolerant cultivars had higher photosynthetic activity based on overexpression of proteins functioned in chloroplast, guaranteeing the sufficient nutrient for plant growth under salt stress. Furthermore, three key proteins were identified as important salt-resistant resources for breeding salt-tolerant cultivars, including sterol side chain reductase, gamma aminobutyrate transaminase and starch synthase. Our results provided series valuable strategies for salt-tolerant cultivars which can be used in future.
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Affiliation(s)
- Qiang Wang
- College of Horticulture, Xinjiang Agricultural University, Urumqi, China,Institute of Horticulture Crops, Xinjiang Academy of Agricultural Sciences, Urumqi, China
| | - Baike Wang
- Institute of Horticulture Crops, Xinjiang Academy of Agricultural Sciences, Urumqi, China
| | - Huifang Liu
- Institute of Horticulture Crops, Xinjiang Academy of Agricultural Sciences, Urumqi, China
| | - Hongwei Han
- Institute of Horticulture Crops, Xinjiang Academy of Agricultural Sciences, Urumqi, China
| | - Hongmei Zhuang
- Institute of Horticulture Crops, Xinjiang Academy of Agricultural Sciences, Urumqi, China
| | - Juan Wang
- Institute of Horticulture Crops, Xinjiang Academy of Agricultural Sciences, Urumqi, China
| | - Tao Yang
- Institute of Horticulture Crops, Xinjiang Academy of Agricultural Sciences, Urumqi, China
| | - Hao Wang
- Institute of Horticulture Crops, Xinjiang Academy of Agricultural Sciences, Urumqi, China
| | - Yong Qin
- College of Horticulture, Xinjiang Agricultural University, Urumqi, China
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Gu M, Yang J, Tian X, Fang W, Xu J, Yin Y. Enhanced total flavonoid accumulation and alleviated growth inhibition of germinating soybeans by GABA under UV-B stress. RSC Adv 2022; 12:6619-6630. [PMID: 35424610 PMCID: PMC8981559 DOI: 10.1039/d2ra00523a] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2022] [Accepted: 02/22/2022] [Indexed: 11/21/2022] Open
Abstract
Germination of soybeans under ultraviolet-B (UV-B) treatment is a simple and effective way to enrich soybean isoflavones, but its mechanism of action is not yet clear. G-Aminobutyric acid (GABA) is a signaling molecule that is involved in the accumulation of secondary metabolites as well as the regulation of plant development and metabolism. In this study, the effects of exogenous GABA and its inhibitors on the physiological and biochemical, antioxidant systems, total flavonoid content, activity and gene expression of isoflavone metabolism related enzyme in germinating soybeans under UV-B treatment were investigated. Compared to UV-B treatment alone, soybean treated with GABA (5 mM) in combination with UV-B significantly increased sprout length, fresh weight, Ca2+ inward flow and peroxidase and catalase activities, and decreased malondialdehyde and H2O2 and O2˙- fluorescence intensity, while soybean treated with GABA inhibitor showed the opposite trend. Meanwhile, total flavonoid content increased by 11.2% and 6.7%, respectively, in 2- and 4 day-old soybeans under UV-B treatment, compared to UV-B treatment alone. Moreover, the application of GABA under UV treatment significantly increased the activity of phenylalanine ammonia-lyase and cinnamic acid-4-hydroxylase, with values increasing by 43.6% and 18.5%, respectively, in four-day-old soybean compared to UV treatment alone, which also increased the relative expression of key genes involved in isoflavone metabolism. The GABA inhibitor 3-mercaptopropionic acid blocked these occurrences. According to this research, GABA could operate as a signaling molecule to mediate isoflavone accumulation in soybean sprouts under UV radiation and stimulate soybean sprout growth.
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Affiliation(s)
- Minglang Gu
- College of Food Science and Engerning, Yangzhou University Yangzhou Jiangsu 225127 People's Republic of China +86-514-89786551 +86-514-89786551
| | - Jia Yang
- Yangzhou Center for Food and Drug Control Yangzhou Jiangsu 225009 People's Republic of China
| | - Xin Tian
- College of Food Science and Engerning, Yangzhou University Yangzhou Jiangsu 225127 People's Republic of China +86-514-89786551 +86-514-89786551
| | - Weiming Fang
- College of Food Science and Engerning, Yangzhou University Yangzhou Jiangsu 225127 People's Republic of China +86-514-89786551 +86-514-89786551
| | - Jinpeng Xu
- College of Food Science and Engerning, Yangzhou University Yangzhou Jiangsu 225127 People's Republic of China +86-514-89786551 +86-514-89786551
| | - Yongqi Yin
- College of Food Science and Engerning, Yangzhou University Yangzhou Jiangsu 225127 People's Republic of China +86-514-89786551 +86-514-89786551
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Xu B, Sai N, Gilliham M. The emerging role of GABA as a transport regulator and physiological signal. PLANT PHYSIOLOGY 2021; 187:2005-2016. [PMID: 35235673 PMCID: PMC8644139 DOI: 10.1093/plphys/kiab347] [Citation(s) in RCA: 23] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/09/2021] [Accepted: 07/10/2021] [Indexed: 05/07/2023]
Abstract
While the proposal that γ-aminobutyric acid (GABA) acts a signal in plants is decades old, a signaling mode of action for plant GABA has been unveiled only relatively recently. Here, we review the recent research that demonstrates how GABA regulates anion transport through aluminum-activated malate transporters (ALMTs) and speculation that GABA also targets other proteins. The ALMT family of anion channels modulates multiple physiological processes in plants, with many members still to be characterized, opening up the possibility that GABA has broad regulatory roles in plants. We focus on the role of GABA in regulating pollen tube growth and stomatal pore aperture, and we speculate on its role in long-distance signaling and how it might be involved in cross talk with hormonal signals. We show that in barley (Hordeum vulgare), guard cell opening is regulated by GABA, as it is in Arabidopsis (Arabidopsis thaliana), to regulate water use efficiency, which impacts drought tolerance. We also discuss the links between glutamate and GABA in generating signals in plants, particularly related to pollen tube growth, wounding, and long-distance electrical signaling, and explore potential interactions of GABA signals with hormones, such as abscisic acid, jasmonic acid, and ethylene. We conclude by postulating that GABA encodes a signal that links plant primary metabolism to physiological status to fine tune plant responses to the environment.
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Affiliation(s)
- Bo Xu
- Plant Transport and Signalling Lab, ARC Centre of Excellence in Plant Energy Biology, Waite Research Institute, Glen Osmond, South Australia 5064, Australia
- School of Agriculture, Food and Wine, University of Adelaide, Glen Osmond, South Australia 5064, Australia
- Author for communication:
| | - Na Sai
- Plant Transport and Signalling Lab, ARC Centre of Excellence in Plant Energy Biology, Waite Research Institute, Glen Osmond, South Australia 5064, Australia
- School of Agriculture, Food and Wine, University of Adelaide, Glen Osmond, South Australia 5064, Australia
| | - Matthew Gilliham
- Plant Transport and Signalling Lab, ARC Centre of Excellence in Plant Energy Biology, Waite Research Institute, Glen Osmond, South Australia 5064, Australia
- School of Agriculture, Food and Wine, University of Adelaide, Glen Osmond, South Australia 5064, Australia
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Liu C, Wang H, Zhang X, Ma F, Guo T, Li C. Activation of the ABA Signal Pathway Mediated by GABA Improves the Drought Resistance of Apple Seedlings. Int J Mol Sci 2021; 22:ijms222312676. [PMID: 34884481 PMCID: PMC8657939 DOI: 10.3390/ijms222312676] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2021] [Revised: 11/18/2021] [Accepted: 11/22/2021] [Indexed: 02/06/2023] Open
Abstract
Drought seriously affects the yield and quality of apples. γ-aminobutyric acid (GABA) plays an important role in the responses of plants to various stresses. However, the role and possible mechanism of GABA in the drought response of apple seedlings remain unknown. To explore the effect of GABA on apple seedlings under drought stress, seedlings of Malus hupehensis were treated with seven concentrations of GABA, and the response of seedlings under 15-day drought stress was observed. The results showed that 0.5 mM GABA was the most effective at relieving drought stress. Treatment with GABA reduced the relative electrical conductivity and MDA content of leaves induced by drought stress and significantly increased the relative water content of leaves. Exogenous GABA significantly decreased the stomatal conductance and intercellular carbon dioxide concentration and transpiration rate, and it significantly increased the photosynthetic rate under drought. GABA also reduced the accumulation of superoxide anions and hydrogen peroxide in leaf tissues under drought and increased the activities of POD, SOD, and CAT and the content of GABA. Exogenous treatment with GABA acted through the accumulation of abscisic acid (ABA) in the leaves to significantly decrease stomatal conductance and increase the stomatal closure rate, and the levels of expression of ABA-related genes PYL4, ABI1, ABI2, HAB1, ABF3, and OST1 changed in response to drought. Taken together, exogenous GABA can enhance the drought tolerance of apple seedlings.
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Kaspal M, Kanapaddalagamage MH, Ramesh SA. Emerging Roles of γ Aminobutyric Acid (GABA) Gated Channels in Plant Stress Tolerance. PLANTS (BASEL, SWITZERLAND) 2021; 10:plants10102178. [PMID: 34685991 PMCID: PMC8540008 DOI: 10.3390/plants10102178] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/01/2021] [Revised: 09/27/2021] [Accepted: 10/04/2021] [Indexed: 05/06/2023]
Abstract
The signaling role for γ-Aminobutyric acid (GABA) has been documented in animals for over seven decades. However, a signaling role for GABA in plants is just beginning to emerge with the discovery of putative GABA binding site/s and GABA regulation of anion channels. In this review, we explore the role of GABA in plant growth and development under abiotic stress, its interactions with other signaling molecules and the probability that there are other anion channels with important roles in stress tolerance that are gated by GABA.
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Kaur R, Zhawar VK. Regulation of secondary antioxidants and carbohydrates by gamma-aminobutyric acid under salinity-alkalinity stress in rice (Oryza sativa L.). Biol Futur 2021; 72:229-239. [PMID: 34554480 DOI: 10.1007/s42977-020-00055-z] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2020] [Accepted: 12/12/2020] [Indexed: 11/29/2022]
Abstract
Gamma-aminobutyric acid (GABA) is known to improve tolerance against abiotic stresses but less studied for salinity-alkalinity stress (SAS). In the present study, GABA regulation of secondary antioxidants and carbohydrates was studied in rice in the presence and absence of SAS. About 1.5 mM GABA, 200 mM SAS, GABA + SAS were applied to 5-day old seedlings, and thereafter measurements were done in shoots and roots at 24, 48, 72 h in rice cultivars CSR 43 (tolerant) and Pusa 44 (susceptible). SAS was applied in molar ratio of 1:9:9:1 of NaCl:Na2SO4:NaHCO3:Na2CO3. Peroxidases (POX), polyphenol oxidases (PPO), lignin, flavonoids and phenolics from secondary metabolism and invertases, hexoses, sucrose and starch from carbohydrate metabolism were studied. Pusa 44 increased soluble POX, lignin, flavonoids in shoots but deficient in roots during stress period but improved under GABA + SAS. CSR 43 increased soluble POX, lignin, flavonoids in roots consistently throughout the stress period and also improved under GABA + SAS. Early increase in cell wall POX/PPO under SAS was seen in CSR 43 only, while Pusa 44 improved this under GABA + SAS. During stress period, CSR 43 showed an increasing trend of cell wall invertase activity, sucrose, sucrose-to-hexose ratio and starch in roots but Pusa 44 showed poor such response but Pusa 44 improved starch, sucrose, sucrose-to-hexose ratio by significant amount in both shoots and roots under GABA + SAS. The overall study indicated GABA as an important regulator of secondary and carbohydrate metabolisms. Besides improving secondary antioxidants, GABA under stress may improve cellular reserves like starch and protective sugars like sucrose.
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Affiliation(s)
- Ramanjeet Kaur
- Department of Biochemistry, College of Basic Sciences and Humanities, Punjab Agricultural University, Ludhiana, Punjab, India, 141004
| | - Vikramjit Kaur Zhawar
- Department of Biochemistry, College of Basic Sciences and Humanities, Punjab Agricultural University, Ludhiana, Punjab, India, 141004.
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Shelp BJ, Aghdam MS, Flaherty EJ. γ-Aminobutyrate (GABA) Regulated Plant Defense: Mechanisms and Opportunities. PLANTS (BASEL, SWITZERLAND) 2021; 10:1939. [PMID: 34579473 PMCID: PMC8468876 DOI: 10.3390/plants10091939] [Citation(s) in RCA: 35] [Impact Index Per Article: 11.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/27/2021] [Revised: 09/13/2021] [Accepted: 09/14/2021] [Indexed: 02/07/2023]
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.
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Affiliation(s)
- Barry J. Shelp
- Department of Plant Agriculture, University of Guelph, Guelph, ON N1G 2W1, Canada;
| | - Morteza Soleimani Aghdam
- Department of Horticultural Science, Imam Khomeini International University, Qazvin 34148-96818, Iran;
| | - Edward J. Flaherty
- Department of Plant Agriculture, University of Guelph, Guelph, ON N1G 2W1, Canada;
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Muscimol Directly Activates the TREK-2 Channel Expressed in GABAergic Neurons through Its N-Terminus. Int J Mol Sci 2021; 22:ijms22179320. [PMID: 34502229 PMCID: PMC8431218 DOI: 10.3390/ijms22179320] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2021] [Revised: 08/25/2021] [Accepted: 08/25/2021] [Indexed: 11/23/2022] Open
Abstract
The two-pore domain K+ (K2P) channel, which is involved in setting the resting membrane potential in neurons, is an essential target for receptor agonists. Activation of the γ-aminobutyric acid (GABA) receptors (GABAAR and GABABR) reduces cellular excitability through Cl- influx and K+ efflux in neurons. Relatively little is known about the link between GABAAR and the K+ channel. The present study was performed to identify the effect of GABAR agonists on K2P channel expression and activity in the neuroblastic B35 cells that maintain glutamic acid decarboxylase (GAD) activity and express GABA. TASK and TREK/TRAAK mRNA were expressed in B35 cells with a high level of TREK-2 and TRAAK. In addition, TREK/TRAAK proteins were detected in the GABAergic neurons obtained from GABA transgenic mice. Furthermore, TREK-2 mRNA and protein expression levels were markedly upregulated in B35 cells by GABAAR and GABABR agonists. In particular, muscimol, a GABAAR agonist, significantly increased TREK-2 expression and activity, but the effect was reduced in the presence of the GABAAR antagonist bicuculine or TREK-2 inhibitor norfluoxetine. In the whole-cell and single-channel patch configurations, muscimol increased TREK-2 activity, but the muscimol effect disappeared in the N-terminal deletion mutant. These results indicate that muscimol directly induces TREK-2 activation through the N-terminus and suggest that muscimol can reduce cellular excitability by activating the TREK-2 channel and by inducing Cl- influx in GABAergic neurons.
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Ghosh UK, Islam MN, Siddiqui MN, Khan MAR. Understanding the roles of osmolytes for acclimatizing plants to changing environment: a review of potential mechanism. PLANT SIGNALING & BEHAVIOR 2021; 16:1913306. [PMID: 34134596 PMCID: PMC8244753 DOI: 10.1080/15592324.2021.1913306] [Citation(s) in RCA: 50] [Impact Index Per Article: 16.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/02/2021] [Revised: 03/30/2021] [Accepted: 03/31/2021] [Indexed: 05/30/2023]
Abstract
Abiotic stresses are significant environmental issues that restrict plant growth, productivity, and survival while also posing a threat to global food production and security. Plants produce compatible solutes known as osmolytes to adapt themselves in such changing environment. Osmolytes contribute to homeostasis maintenance, provide the driving gradient for water uptake, maintain cell turgor by osmotic adjustment, and redox metabolism to remove excess level of reactive oxygen species (ROS) and reestablish the cellular redox balance as well as protect cellular machinery from osmotic stress and oxidative damage. Perceiving the mechanisms how plants interpret environmental signals and transmit them to cellular machinery to activate adaptive responses is important for crop improvement programs to get stress-tolerant varieties. A large number of studies conducted in the last few decades have shown that osmolytes accumulate in plants and have strong associations with abiotic stress tolerance. Production of abundant osmolytes is needed for tolerance in many plant species. In addition, transgenic plants overexpressing genes for different osmolytes showed enhanced tolerance to various abiotic stresses. Many important aspects of their mechanisms of action are yet to be largely identified, especially regarding the relevance and relative contribution of specific osmolytes to the stress tolerance of a given species. Therefore, more efforts and resources should be invested in the study of the abiotic stress responses of plants in their natural habitats. The present review focuses on the possible roles and mechanisms of osmolytes and their association toward abiotic stress tolerance in plants. This review would help the readers in learning more about osmolytes and how they behave in changing environments as well as getting an idea of how this knowledge could be applied to develop stress tolerance in plants.
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Affiliation(s)
- Uttam Kumar Ghosh
- Department of Agronomy, Bangabandhu Sheikh Mujibur Rahman Agricultural University, Gazipur, Bangladesh
| | - Md. Nahidul Islam
- Department of Agro-Processing, Bangabandhu Sheikh Mujibur Rahman Agricultural University, Gazipur, Bangladesh
| | - Md. Nurealam Siddiqui
- Department of Biochemistry and Molecular Biology, Bangabandhu Sheikh Mujibur Rahman Agricultural University, Gazipur, Bangladesh
- Institute of Crop Science and Resource Conservation (Inres)-plant Breeding and Biotechnology, University of Bonn, Bonn, Germany
| | - Md. Arifur Rahman Khan
- Department of Agronomy, Bangabandhu Sheikh Mujibur Rahman Agricultural University, Gazipur, Bangladesh
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GABA Regulates Phenolics Accumulation in Soybean Sprouts under NaCl Stress. Antioxidants (Basel) 2021; 10:antiox10060990. [PMID: 34205788 PMCID: PMC8235516 DOI: 10.3390/antiox10060990] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2021] [Revised: 06/16/2021] [Accepted: 06/16/2021] [Indexed: 11/25/2022] Open
Abstract
NaCl stress causes oxidative stress in plants; γ-aminobutyric acid (GABA) could alleviate such abiotic stress by enhancing the synthesis of phenolics, but the underlying mechanism is not clear. We investigated the effects of GABA on phenolics accumulation in soybean sprouts under NaCl stress by measuring changes in the content of physiological biochemicals and phenolic substances, in the activity and gene expression of key enzymes, and in antioxidant capacity. GABA reduced the oxidative damage in soybean sprouts caused by NaCl stress and enhanced the content of total phenolics, phenolic acids, and isoflavones by 16.58%, 22.47%, and 3.75%, respectively. It also increased the activities and expression of phenylalanine ammonia lyase, cinnamic acid 4-hydroxylase, and 4-coumarate coenzyme A ligase. Furthermore, GABA increased the activity of antioxidant enzymes and the antioxidant capacity. These events were inhibited by 3-mercaptopropionate (an inhibitor for GABA synthesis), indicating that GABA mediated phenolics accumulation and antioxidant system enhancement in soybean sprouts under NaCl stress.
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Li L, Dou N, Zhang H, Wu C. The versatile GABA in plants. PLANT SIGNALING & BEHAVIOR 2021; 16:1862565. [PMID: 33404284 PMCID: PMC7889023 DOI: 10.1080/15592324.2020.1862565] [Citation(s) in RCA: 93] [Impact Index Per Article: 31.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/23/2020] [Revised: 12/05/2020] [Accepted: 12/07/2020] [Indexed: 05/19/2023]
Abstract
Gamma-aminobutyric acid (GABA) is a ubiquitous four-carbon, non-protein amino acid. GABA has been widely studied in animal central nervous systems, where it acts as an inhibitory neurotransmitter. In plants, it is metabolized through the GABA shunt pathway, a bypass of the tricarboxylic acid (TCA) cycle. Additionally, it can be synthesized through the polyamine metabolic pathway. GABA acts as a signal in Agrobacterium tumefaciens-mediated plant gene transformation and in plant development, especially in pollen tube elongation (to enter the ovule), root growth, fruit ripening, and seed germination. It is accumulated during plant responses to environmental stresses and pathogen and insect attacks. A high concentration of GABA elevates plant stress tolerance by improving photosynthesis, inhibiting reactive oxygen species (ROS) generation, activating antioxidant enzymes, and regulating stomatal opening in drought stress. The transporters of GABA in plants are reviewed in this work. We summarize the recent research on GABA function and transporters with the goal of providing a review of GABA in plants.
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Affiliation(s)
- Li Li
- Shandong Provincial Key Laboratory of Plant Stress Research, College of Life Science, Shandong Normal University, Ji’nan, Shandong, China
| | - Na Dou
- Shandong Provincial Key Laboratory of Plant Stress Research, College of Life Science, Shandong Normal University, Ji’nan, Shandong, China
| | - Hui Zhang
- Shandong Provincial Key Laboratory of Plant Stress Research, College of Life Science, Shandong Normal University, Ji’nan, Shandong, China
| | - Chunxia Wu
- Shandong Provincial Key Laboratory of Plant Stress Research, College of Life Science, Shandong Normal University, Ji’nan, Shandong, China
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Li Q, Zhao Y, Ding W, Han B, Geng S, Ning D, Ma T, Yu X. Gamma-aminobutyric acid facilitates the simultaneous production of biomass, astaxanthin and lipids in Haematococcus pluvialis under salinity and high-light stress conditions. BIORESOURCE TECHNOLOGY 2021; 320:124418. [PMID: 33221643 DOI: 10.1016/j.biortech.2020.124418] [Citation(s) in RCA: 40] [Impact Index Per Article: 13.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/07/2020] [Revised: 11/11/2020] [Accepted: 11/11/2020] [Indexed: 05/20/2023]
Abstract
The effects of γ-aminobutyric acid (GABA) on the biomass and astaxanthin and lipids production in Haematococcus pluvialis under combined salinity stress and high-light stresses were investigated. The results showed that the highest biomass (1.65 g L-1), astaxanthin production (3.86 mg L-1 d-1) and lipids content (55.11%) in H. pluvialis LUGU were observed under the 0.25 mM GABA treatment. Moreover, compared with salinity and high-light stress, GABA treatment also increased the transcript levels of biosynthesis genes, the contents of endogenous GABA and carbohydrates but decreased reactive oxygen species (ROS) levels. Further evidence revealed that intracellular GABA could regulate cell growth, astaxanthin production and lipids synthesis by mediating carotenogenesis, lipogenesis and ROS signalling. Collectively, this study provides a combined strategy for promoting the coproduction of astaxanthin and lipids and sheds light on the regulatory mechanism through which GABA affects cell growth, astaxanthin production and lipids biosynthesis in H. pluvialis under unfavourable conditions.
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Affiliation(s)
- Qingqing Li
- Faculty of Life Science and Technology, Kunming University of Science and Technology, Kunming 650500, China
| | - Yongteng Zhao
- Faculty of Life Science and Technology, Kunming University of Science and Technology, Kunming 650500, China
| | - Wei Ding
- Faculty of Life Science and Technology, Kunming University of Science and Technology, Kunming 650500, China
| | - Benyong Han
- Faculty of Life Science and Technology, Kunming University of Science and Technology, Kunming 650500, China
| | - Shuxiang Geng
- Yunnan Academy of Forestry and Grassland, Kunming 650051, China
| | - Delu Ning
- Yunnan Academy of Forestry and Grassland, Kunming 650051, China
| | - Ting Ma
- Yunnan Academy of Forestry and Grassland, Kunming 650051, China
| | - Xuya Yu
- Faculty of Life Science and Technology, Kunming University of Science and Technology, Kunming 650500, China.
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Chen W, Meng C, Ji J, Li MH, Zhang X, Wu Y, Xie T, Du C, Sun J, Jiang Z, Shi S. Exogenous GABA promotes adaptation and growth by altering the carbon and nitrogen metabolic flux in poplar seedlings under low nitrogen conditions. TREE PHYSIOLOGY 2020; 40:1744-1761. [PMID: 32776117 DOI: 10.1093/treephys/tpaa101] [Citation(s) in RCA: 21] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/16/2020] [Revised: 06/10/2020] [Accepted: 08/06/2020] [Indexed: 05/26/2023]
Abstract
Nitrogen (N) deficiency adversely affects tree growth. Additionally, γ-aminobutyric acid (GABA) is closely associated with growth and stress responses because of its effects on carbon (C) and N metabolism. However, little is known about its roles related to plant adaptations to N-deficient conditions. In this study, we analyzed the effects of GABA (0, 2 and 10 mM) applications on the growth traits and physiological responses of poplar (Populus alba × P. glandulosa '84K') seedlings under high N (HN) and low N (LN) conditions. We found that the added GABA interacted with N to affect more than half of the studied parameters, with greater effects in LN plants than in HN plants. Under LN conditions, the GABA application tended to increase poplar growth, accompanied by increased xylem fiber cell length and xylem width. In stems, exogenous GABA increased the abundance of non-structural carbohydrates (starch and sugars) and tricarboxylic acid cycle intermediates (succinate, malate and citrate), but had the opposite effect on the structural C contents (hemicellulose and lignin). Meanwhile, exogenous GABA increased the total soluble protein contents in leaves and stems, accompanied by significant increases in nitrate reductase, nitrite reductase and glutamine synthetase activities in leaves, but significant decreases in those (except for the increased glutamate synthetase activity) in stems. A multiple factorial analysis indicated that the nitrate assimilation pathway substantially influences poplar survival and growth in the presence of GABA under LN conditions. Interestingly, GABA applications also considerably attenuated the LN-induced increase in the activities of leaf antioxidant enzymes, including peroxidase and catalase, implying that GABA may regulate the relative allocation of C and N for growth activities by decreasing the energy cost associated with stress defense. Our results suggest that GABA enhances poplar growth and adaptation by regulating the C and N metabolic flux under N-deficient conditions.
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Affiliation(s)
- Wei Chen
- State Key Laboratory of Tree Genetics and Breeding, Key Laboratory of Tree Breeding and Cultivation of National Forestry and Grassland Administration, Research Institute of Forestry, the Chinese Academy of Forestry, Xiangshan Road, Haidian District, Beijing 100091, China
| | - Chen Meng
- Bavarian Center for Biomolecular Mass Spectrometry, Technical University of Munich, Gregor-Mendel-Strasse 4, Freising 85354, Germany
| | - Jing Ji
- State Key Laboratory of Tree Genetics and Breeding, Key Laboratory of Tree Breeding and Cultivation of National Forestry and Grassland Administration, Research Institute of Forestry, the Chinese Academy of Forestry, Xiangshan Road, Haidian District, Beijing 100091, China
| | - Mai-He Li
- Forest Dynamics, Swiss Federal Research Institute WSL, Zuercherstrasse 111, Birmensdorf CH-8903, Switzerland
- Erguna Forest-Steppe Ecotone Research Station, CAS Key Laboratory of Forest Ecology and Management, Institute of Applied Ecology, Chinese Academy of Sciences, Wenhua Road 72, Shenhe District, Shenyang 110016, China
- Key Laboratory of Geographical Processes and Ecological Security in Changbai Mountains, Ministry of Education, School of Geographical Sciences, Northeast Normal University, Renmin Street 268, Nanguan District, Changchun 130024, China
| | - Xiaoman Zhang
- College of Landscape Architecture, Hebei Agricultural University, Lekai South Street 2596, Lianchi District, Baoding 071000, China
| | - Yanyan Wu
- State Key Laboratory of Tree Genetics and Breeding, Key Laboratory of Tree Breeding and Cultivation of National Forestry and Grassland Administration, Research Institute of Forestry, the Chinese Academy of Forestry, Xiangshan Road, Haidian District, Beijing 100091, China
| | - Tiantian Xie
- State Key Laboratory of Tree Genetics and Breeding, Key Laboratory of Tree Breeding and Cultivation of National Forestry and Grassland Administration, Research Institute of Forestry, the Chinese Academy of Forestry, Xiangshan Road, Haidian District, Beijing 100091, China
| | - Changjian Du
- State Key Laboratory of Tree Genetics and Breeding, Key Laboratory of Tree Breeding and Cultivation of National Forestry and Grassland Administration, Research Institute of Forestry, the Chinese Academy of Forestry, Xiangshan Road, Haidian District, Beijing 100091, China
| | - Jiacheng Sun
- State Key Laboratory of Tree Genetics and Breeding, Key Laboratory of Tree Breeding and Cultivation of National Forestry and Grassland Administration, Research Institute of Forestry, the Chinese Academy of Forestry, Xiangshan Road, Haidian District, Beijing 100091, China
| | - Zeping Jiang
- Key Laboratory of Forest Ecology and Environment of National Forestry and Grassland Administration, Research Institute of Forest Ecology, Environment and Protection, The Chinese Academy of Forestry, LXiangshan Road, Haidian District, Beijing 100091, China
| | - Shengqing Shi
- State Key Laboratory of Tree Genetics and Breeding, Key Laboratory of Tree Breeding and Cultivation of National Forestry and Grassland Administration, Research Institute of Forestry, the Chinese Academy of Forestry, Xiangshan Road, Haidian District, Beijing 100091, China
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Priming with γ-Aminobutyric Acid against Botrytis cinerea Reshuffles Metabolism and Reactive Oxygen Species: Dissecting Signalling and Metabolism. Antioxidants (Basel) 2020; 9:antiox9121174. [PMID: 33255543 PMCID: PMC7759855 DOI: 10.3390/antiox9121174] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2020] [Revised: 11/21/2020] [Accepted: 11/23/2020] [Indexed: 12/12/2022] Open
Abstract
The stress-inducible non-proteinogenic amino acid γ-aminobutyric acid (GABA) is known to alleviate several (a)biotic stresses in plants. GABA forms an important link between carbon and nitrogen metabolism and has been proposed as a signalling molecule in plants. Here, we set out to establish GABA as a priming compound against Botrytis cinerea in Arabidopsis thaliana and how metabolism and reactive oxygen species (ROS) are influenced after GABA treatment and infection. We show that GABA already primes disease resistance at low concentrations (100 µM), comparable to the well-characterized priming agent β-Aminobutyric acid (BABA). Treatment with GABA reduced ROS burst in response to flg22 (bacterial peptide derived from flagellum) and oligogalacturonides (OGs). Plants treated with GABA showed reduced H2O2 accumulation after infection due to increased activity of catalase and guaiacol peroxidase. Contrary to 100 µM GABA treatments, 1 mM exogenous GABA induced endogenous GABA before and after infection. Strikingly, 1 mM GABA promoted total and active nitrate reductase activity whereas 100 µM inhibited active nitrate reductase. Sucrose accumulated after GABA treatment, whereas glucose and fructose only accumulated in treated plants after infection. We propose that extracellular GABA signalling and endogenous metabolism can be separated at low exogenous concentrations.
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Knott EL, Leidenheimer NJ. A Targeted Bioinformatics Assessment of Adrenocortical Carcinoma Reveals Prognostic Implications of GABA System Gene Expression. Int J Mol Sci 2020; 21:ijms21228485. [PMID: 33187258 PMCID: PMC7697095 DOI: 10.3390/ijms21228485] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2020] [Revised: 11/05/2020] [Accepted: 11/09/2020] [Indexed: 12/12/2022] Open
Abstract
Adrenocortical carcinoma (ACC) is a rare but deadly cancer for which few treatments exist. Here, we have undertaken a targeted bioinformatics study of The Cancer Genome Atlas (TCGA) ACC dataset focusing on the 30 genes encoding the γ-aminobutyric acid (GABA) system—an under-studied, evolutionarily-conserved system that is an emerging potential player in cancer progression. Our analysis identified a subset of ACC patients whose tumors expressed a distinct GABA system transcriptome. Transcript levels of ABAT (encoding a key GABA shunt enzyme), were upregulated in over 40% of tumors, and this correlated with several favorable clinical outcomes including patient survival; while enrichment and ontology analysis implicated two cancer-related biological pathways involved in metastasis and immune response. The phenotype associated with ABAT upregulation revealed a potential metabolic heterogeneity among ACC tumors associated with enhanced mitochondrial metabolism. Furthermore, many GABAA receptor subunit-encoding transcripts were expressed, including two (GABRB2 and GABRD) prognostic for patient survival. Transcripts encoding GABAB receptor subunits and GABA transporters were also ubiquitously expressed. The GABA system transcriptome of ACC tumors is largely mirrored in the ACC NCI-H295R cell line, suggesting that this cell line may be appropriate for future functional studies investigating the role of the GABA system in ACC cell growth phenotypes and metabolism.
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Zhang H, Huo Y, Xu Z, Guo K, Wang Y, Zhang X, Xu N, Sun G. Physiological and proteomics responses of nitrogen assimilation and glutamine/glutamine family of amino acids metabolism in mulberry ( Morus alba L.) leaves to NaCl and NaHCO 3 stress. PLANT SIGNALING & BEHAVIOR 2020; 15:1798108. [PMID: 32729371 PMCID: PMC8550533 DOI: 10.1080/15592324.2020.1798108] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/01/2020] [Revised: 06/21/2020] [Accepted: 06/22/2020] [Indexed: 05/04/2023]
Abstract
In order to find out the response mechanism of nitrogen assimilation and glutamine/glutamine family of amino acids metabolism in mulberry (Morus alba L.) leaves under NaCl and NaHCO3 stress, and to reveal its role in salt alkali adaptation. The effects of the nitrogen metabolism of mulberry leaves were studied under 100 mmol L-1 NaCl and NaHCO3 stress.The results showed that the activity of NR and the content of TN and SP did not change significantly, the expression of NiR, Fd-NiR, Fd-NiR gene and theactivity of NiR increased significantly under NaCl stress, but nitrogen assimilation was inhibited under NaHCO3 stress. NaCl stress had no significant effect on the expression and activity of GS and GOGAT in mulberry leaves. Under NaHCO3 stress, the expression of Fd-GOGAT, Fd-GOGAT2, Fd-GOGAT gene, and the activity of GS and GOGAT were significantly decreased. NaCl stress can promote the accumulation of Pro, Put and Spd in mulberry leaves. The accumulation of Pro under NaHCO3 stress is greater than that under NaCl stress. NaCl stress also induced the up-regulation of GAD, GAD1 and GAD1 gene expression, so promoting the synthesis of GABA may be an adaptive mechanism for mulberry to cope with NaCl stress, but the expression of GAD did not change significantly and GAD gene expression lower than CK under NaHCO3 stress. Although both NaCl and NaHCO3 stress could promote the synthesis of GSH by up-regulation of GCLM expression, GSH under NaHCO3 stress was significantly higher than that under NaCl stress, the content of H2O2 was still significantly higher than that of NaCl stress, that means GSH may not play a key role in alleviating the oxidative damage in mulberry leaves caused by salt and alkali.
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Affiliation(s)
- Huihui Zhang
- College of Resources and Environment, NortheastAgriculturalUniversity, Harbin, Heilongjiang, China
- Key Laboratory of Saline-alkali Vegetation Ecology Restoration, Ministry of Education, Northeast Forestry University, Harbin, Heilongjiang, China
| | - Yuze Huo
- College of Resources and Environment, NortheastAgriculturalUniversity, Harbin, Heilongjiang, China
| | - Zisong Xu
- College of Resources and Environment, NortheastAgriculturalUniversity, Harbin, Heilongjiang, China
| | - Kaiwen Guo
- College of Resources and Environment, NortheastAgriculturalUniversity, Harbin, Heilongjiang, China
| | - Yue Wang
- Key Laboratory of Saline-alkali Vegetation Ecology Restoration, Ministry of Education, Northeast Forestry University, Harbin, Heilongjiang, China
| | - Xiaosong Zhang
- Department of Research and Education, Dalian Academy of Agricultural Sciences, Dalian, Liaoning, China
| | - Nan Xu
- Key Laboratory of Saline-alkali Vegetation Ecology Restoration, Ministry of Education, Northeast Forestry University, Harbin, Heilongjiang, China
- Province Key Laboratory of Cold Region Wetland Ecology and Environment Research, Harbin University, Harbin, Heilongjiang, China
- Natural Resources and Ecology Institute, Heilongjiang Sciences Academy, Harbin, Heilongjiang, China
| | - Guangyu Sun
- Key Laboratory of Saline-alkali Vegetation Ecology Restoration, Ministry of Education, Northeast Forestry University, Harbin, Heilongjiang, China
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Luo L, Li Z, Tang MY, Cheng BZ, Zeng WH, Peng Y, Nie G, Zhang XQ. Metabolic regulation of polyamines and γ-aminobutyric acid in relation to spermidine-induced heat tolerance in white clover. PLANT BIOLOGY (STUTTGART, GERMANY) 2020; 22:794-804. [PMID: 32501628 DOI: 10.1111/plb.13139] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/21/2020] [Accepted: 05/11/2020] [Indexed: 06/11/2023]
Abstract
Heat stress decreases crop growth and yield worldwide. Spermidine (Spd) is a small aliphatic amine and acts as a ubiquitous regulator for plant growth, development and stress tolerance. Objectives of this study were to determine effects of exogenous Spd on changes in endogenous polyamine (PA) and γ-aminobutyric acid (GABA) metabolism, oxidative damage, senescence and heat shock protein (HSP) expression in white clover subjected to heat stress. Physiological and molecular methods, including colorimetric assay, high performance liquid chromatography and qRT-PCR, were applied. Results showed that exogenous Spd significantly alleviated heat-induced stress damage. Application of Spd not only increased endogenous putrescine, Spd, spermine and total PA accumulation, but also accelerated PA oxidation and improved glutamic acid decarboxylase activity, leading to GABA accumulation in leaves under heat stress. The Spd-pretreated white clover maintained a significantly higher chlorophyll (Chl) content than untreated plants under heat stress, which could be related to the roles of Spd in up-regulating genes encoding Chl synthesis (PBGD and Mg-CHT) and maintaining reduced Chl degradation (PaO and CHLASE) during heat stress. In addition, Spd up-regulated HSP70, HSP70B and HSP70-5 expression, which might function in stabilizing denatured proteins and helping proteins to folding correctly in white clover under high temperature stress. In summary, exogenous Spd treatment improves the heat tolerance of white clover by altering endogenous PA and GABA content and metabolism, enhancing the antioxidant system and HSP expression and slowing leaf senescence related to an increase in Chl biosynthesis and a decrease in Chl degradation during heat stress.
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Affiliation(s)
- L Luo
- Department of Grassland Science, College of Animal Science and Technology, Sichuan Agricultural University, Chengdu, 611130, China
| | - Z Li
- Department of Grassland Science, College of Animal Science and Technology, Sichuan Agricultural University, Chengdu, 611130, China
| | - M Y Tang
- Department of Grassland Science, College of Animal Science and Technology, Sichuan Agricultural University, Chengdu, 611130, China
| | - B Z Cheng
- Department of Grassland Science, College of Animal Science and Technology, Sichuan Agricultural University, Chengdu, 611130, China
| | - W H Zeng
- Department of Grassland Science, College of Animal Science and Technology, Sichuan Agricultural University, Chengdu, 611130, China
| | - Y Peng
- Department of Grassland Science, College of Animal Science and Technology, Sichuan Agricultural University, Chengdu, 611130, China
| | - G Nie
- Department of Grassland Science, College of Animal Science and Technology, Sichuan Agricultural University, Chengdu, 611130, China
| | - X Q Zhang
- Department of Grassland Science, College of Animal Science and Technology, Sichuan Agricultural University, Chengdu, 611130, China
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Ji J, Shi S, Chen W, Xie T, Du C, Sun J, Shi Z, Gao R, Jiang Z, Xiao W. Effects of exogenous γ-Aminobutyric acid on the regulation of respiration and protein expression in germinating seeds of mungbean (Vigna radiata) under salt conditions. ELECTRON J BIOTECHN 2020. [DOI: 10.1016/j.ejbt.2020.05.005] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022] Open
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Aloisi I, Distefano G, Antognoni F, Potente G, Parrotta L, Faleri C, Gentile A, Bennici S, Mareri L, Cai G, Del Duca S. Temperature-Dependent Compatible and Incompatible Pollen-Style Interactions in Citrus clementina Hort. ex Tan. Show Different Transglutaminase Features and Polyamine Pattern. FRONTIERS IN PLANT SCIENCE 2020; 11:1018. [PMID: 32733518 PMCID: PMC7360793 DOI: 10.3389/fpls.2020.01018] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/09/2020] [Accepted: 06/22/2020] [Indexed: 05/27/2023]
Abstract
In clementine, failure of fertilization can result in parthenocarpic fruit development, which has several advantages, such as seedless fruit, longer shelf-life, and greater consumer appeal. Recently, S-RNases have been identified in Citrus grandis, thus revealing that the self-incompatibility (SI) reaction relies on the S-RNase gametophytic mechanism. The fundamental role of environmental factors, mostly temperature, in determining the numbers of pollen tubes reaching the ovary is also well established in Citrus. In the present work, temperature-dependent pollen-pistil interactions in C. clementina were analyzed, focusing on several morphological aspects, as well as on polyamine (PA) content and the activity and distribution of transglutaminase (TGase), both reported to be involved in the SI response in pear and in pummelo. Results clearly indicate that temperature contributed to a different activation of the SI response, which occurs at optimal temperature of 25°C but was by-passed at 15°C. TGase activity was stimulated during the SI response, and it localized differently in the compatible and incompatible interaction: in compatible pollinated styles, TGase localized inside the style canal, while it was detected all around it in incompatible crosses. TGase localization and activity were congruent with the levels of soluble and insoluble conjugated PAs and with morphological evidences, which highlighted cell wall modification occurring as a result of SI.
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Affiliation(s)
- Iris Aloisi
- Department of Biological, Geological and Environmental Sciences, University of Bologna, Bologna, Italy
| | - Gaetano Distefano
- Department of Agricultural and Food Production Sciences, University of Catania, Catania, Italy
| | - Fabiana Antognoni
- Department for Life Quality Studies, University of Bologna, Rimini, Italy
| | - Giulia Potente
- Department for Life Quality Studies, University of Bologna, Rimini, Italy
| | - Luigi Parrotta
- Department of Biological, Geological and Environmental Sciences, University of Bologna, Bologna, Italy
| | - Claudia Faleri
- Department of Life Sciences, University of Siena, Siena, Italy
| | - Alessandra Gentile
- Department of Agricultural and Food Production Sciences, University of Catania, Catania, Italy
| | - Stefania Bennici
- Department of Agricultural and Food Production Sciences, University of Catania, Catania, Italy
| | - Lavinia Mareri
- Department of Life Sciences, University of Siena, Siena, Italy
| | - Giampiero Cai
- Department of Life Sciences, University of Siena, Siena, Italy
| | - Stefano Del Duca
- Department of Biological, Geological and Environmental Sciences, University of Bologna, Bologna, Italy
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Ji J, Shi Z, Xie T, Zhang X, Chen W, Du C, Sun J, Yue J, Zhao X, Jiang Z, Shi S. Responses of GABA shunt coupled with carbon and nitrogen metabolism in poplar under NaCl and CdCl 2 stresses. ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY 2020; 193:110322. [PMID: 32109582 DOI: 10.1016/j.ecoenv.2020.110322] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/16/2019] [Revised: 02/05/2020] [Accepted: 02/08/2020] [Indexed: 05/20/2023]
Abstract
The γ-aminobutyric acid (GABA) shunt is closely associated with plant tolerance; however, little is known about its mechanism. This study aimed to decipher the responses of the GABA shunt and related carbon-nitrogen metabolism in poplar seedlings (Populus alba × Populus glandulosa) treated with different NaCl and CdCl2 concentrations for 30 h. The results showed that the activities of glutamate decarboxylase (GAD) and GABA-transaminase (GABA-T) were activated, as well as α-ketoglutarate dehydrogenase (α-KGDH) and succinate dehydrogenase (SDH) activities were enhanced by NaCl and CdCl2 stresses, except for SDH under CdCl2 stress. Meanwhile, the expression levels of GADs, GABA-Ts SDHs, succinyl-CoA ligases (SCSs), and succinic acid aldehyde dehydrogenases (SSADHs) were also increased. Notably, significant increases in the key components of GABA shunt, Glu and GABA, were observed under both stresses. Soluble sugars and free amino acids were enhanced, whereas citrate, malate and succinate were almost inhibited by both NaCl and CdCl2 stresses except that citrate was not changed or just increased by 50-mM NaCl stress. Thus, these results suggested that the carbon-nitrogen balance could be altered by activating the GABA shunt when main TCA-cycle intermediates were inhibited under NaCl and CdCl2 stresses. This study can enhance the understanding about the functions of the GABA shunt in woody plants under abiotic stresses and may be applied to the genetic improvement of trees for phytoremediation.
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Affiliation(s)
- Jing Ji
- State Key Laboratory of Tree Genetics and Breeding, Key Laboratory of Tree Breeding and Cultivation of State Forestry and Grassland Administration, Research Institute of Forestry, Chinese Academy of Forestry, 1958 Box, Beijing, 100091, China
| | - Zheng Shi
- Research Institute of Forest Ecology, Environment and Protection, Key Laboratory of Forest Ecology and Environment of State Forestry and Grassland Administration, Chinese Academy of Forestry, 1958 Box, Beijing, 100091, China
| | - Tiantian Xie
- State Key Laboratory of Tree Genetics and Breeding, Key Laboratory of Tree Breeding and Cultivation of State Forestry and Grassland Administration, Research Institute of Forestry, Chinese Academy of Forestry, 1958 Box, Beijing, 100091, China
| | - Xiaoman Zhang
- College of Landscape Architecture and Tourism, Hebei Agricultural University, No. 289 Lingyusi Street, Baoding, 071001, Hebei, China
| | - Wei Chen
- State Key Laboratory of Tree Genetics and Breeding, Key Laboratory of Tree Breeding and Cultivation of State Forestry and Grassland Administration, Research Institute of Forestry, Chinese Academy of Forestry, 1958 Box, Beijing, 100091, China
| | - Changjian Du
- State Key Laboratory of Tree Genetics and Breeding, Key Laboratory of Tree Breeding and Cultivation of State Forestry and Grassland Administration, Research Institute of Forestry, Chinese Academy of Forestry, 1958 Box, Beijing, 100091, China
| | - Jiacheng Sun
- State Key Laboratory of Tree Genetics and Breeding, Key Laboratory of Tree Breeding and Cultivation of State Forestry and Grassland Administration, Research Institute of Forestry, Chinese Academy of Forestry, 1958 Box, Beijing, 100091, China
| | - Jianyun Yue
- State Key Laboratory of Tree Genetics and Breeding, Key Laboratory of Tree Breeding and Cultivation of State Forestry and Grassland Administration, Research Institute of Forestry, Chinese Academy of Forestry, 1958 Box, Beijing, 100091, China
| | - Xiulian Zhao
- State Key Laboratory of Tree Genetics and Breeding, Key Laboratory of Tree Breeding and Cultivation of State Forestry and Grassland Administration, Research Institute of Forestry, Chinese Academy of Forestry, 1958 Box, Beijing, 100091, China
| | - Zeping Jiang
- Research Institute of Forest Ecology, Environment and Protection, Key Laboratory of Forest Ecology and Environment of State Forestry and Grassland Administration, Chinese Academy of Forestry, 1958 Box, Beijing, 100091, China
| | - Shengqing Shi
- State Key Laboratory of Tree Genetics and Breeding, Key Laboratory of Tree Breeding and Cultivation of State Forestry and Grassland Administration, Research Institute of Forestry, Chinese Academy of Forestry, 1958 Box, Beijing, 100091, China.
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Du C, Chen W, Wu Y, Wang G, Zhao J, Sun J, Ji J, Yan D, Jiang Z, Shi S. Effects of GABA and Vigabatrin on the Germination of Chinese Chestnut Recalcitrant Seeds and Its Implications for Seed Dormancy and Storage. PLANTS 2020; 9:plants9040449. [PMID: 32260136 PMCID: PMC7238225 DOI: 10.3390/plants9040449] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/19/2020] [Revised: 03/31/2020] [Accepted: 04/01/2020] [Indexed: 02/07/2023]
Abstract
Recalcitrant chestnut seeds are rich in γ-aminobutyric acid (GABA), which negatively regulates adventitious root development by altering carbon/nitrogen metabolism. However, little is known regarding the role of this metabolite in chestnut seeds. In this study, we investigated the effects of GABA changes on the germination of chestnut seeds treated with exogenous GABA and vigabatrin (VGB, which inhibits GABA degradation). Both treatments significantly inhibited seed germination and primary root growth and resulted in the considerable accumulation of H2O2, but the endogenous GABA content decreased before germination at 48 h. Soluble sugar levels increased before germination, but subsequently decreased, whereas starch contents were relatively unchanged. Changes to organic acids were observed at 120 h after sowing, including a decrease and increase in citrate and malate levels, respectively. Similarly, soluble protein contents increased at 120 h, but the abundance of most free amino acids decreased at 48 h. Moreover, the total amino acid levels increased only in response to VGB at 0 h. Accordingly, GABA and VGB altered the balance of carbon and nitrogen metabolism, thereby inhibiting chestnut seed germination. These results suggested that changes to GABA levels in chestnut seeds might prevent seed germination. The study data may also help clarify the dormancy and storage of chestnut seeds, as well as other recalcitrant seeds.
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Affiliation(s)
- Changjian Du
- State Key Laboratory of Tree Genetics and Breeding, Key Laboratory of Tree Breeding and Cultivation of State Forestry and Grassland Administration, Research Institute of Forestry, the Chinese Academy of Forestry, 1958 Box, Beijing 100091, China; (C.D.); (W.C.); (Y.W.); (J.S.); (J.J.)
| | - Wei Chen
- State Key Laboratory of Tree Genetics and Breeding, Key Laboratory of Tree Breeding and Cultivation of State Forestry and Grassland Administration, Research Institute of Forestry, the Chinese Academy of Forestry, 1958 Box, Beijing 100091, China; (C.D.); (W.C.); (Y.W.); (J.S.); (J.J.)
| | - Yanyan Wu
- State Key Laboratory of Tree Genetics and Breeding, Key Laboratory of Tree Breeding and Cultivation of State Forestry and Grassland Administration, Research Institute of Forestry, the Chinese Academy of Forestry, 1958 Box, Beijing 100091, China; (C.D.); (W.C.); (Y.W.); (J.S.); (J.J.)
| | - Guangpeng Wang
- Institute for Pomology, Hebei Academy of Agriculture and Forestry Sciences, Changli 066600, China;
| | - Jiabing Zhao
- College of Forestry, Hebei Agricultural University, Baoding 071001, China;
| | - Jiacheng Sun
- State Key Laboratory of Tree Genetics and Breeding, Key Laboratory of Tree Breeding and Cultivation of State Forestry and Grassland Administration, Research Institute of Forestry, the Chinese Academy of Forestry, 1958 Box, Beijing 100091, China; (C.D.); (W.C.); (Y.W.); (J.S.); (J.J.)
| | - Jing Ji
- State Key Laboratory of Tree Genetics and Breeding, Key Laboratory of Tree Breeding and Cultivation of State Forestry and Grassland Administration, Research Institute of Forestry, the Chinese Academy of Forestry, 1958 Box, Beijing 100091, China; (C.D.); (W.C.); (Y.W.); (J.S.); (J.J.)
| | - Donghui Yan
- Key Laboratory of Forest Ecology and Environment of National Forestry and Grassland Administration, Research Institute of Forest Ecology, Environment and Protection, the Chinese Academy of Forestry, 1958 Box, Beijing 100091, China; (D.Y.); (Z.J.)
| | - Zeping Jiang
- Key Laboratory of Forest Ecology and Environment of National Forestry and Grassland Administration, Research Institute of Forest Ecology, Environment and Protection, the Chinese Academy of Forestry, 1958 Box, Beijing 100091, China; (D.Y.); (Z.J.)
| | - Shengqing Shi
- State Key Laboratory of Tree Genetics and Breeding, Key Laboratory of Tree Breeding and Cultivation of State Forestry and Grassland Administration, Research Institute of Forestry, the Chinese Academy of Forestry, 1958 Box, Beijing 100091, China; (C.D.); (W.C.); (Y.W.); (J.S.); (J.J.)
- Correspondence: ; Tel.: +86-10-62889054
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Guo Z, Du N, Li Y, Zheng S, Shen S, Piao F. Gamma-aminobutyric acid enhances tolerance to iron deficiency by stimulating auxin signaling in cucumber (Cucumis sativusL.). ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY 2020; 192:110285. [PMID: 32035398 DOI: 10.1016/j.ecoenv.2020.110285] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/28/2019] [Revised: 01/11/2020] [Accepted: 01/31/2020] [Indexed: 06/10/2023]
Abstract
Iron deficiency severely affects crop yield and quality. Gamma-aminobutyric acid (GABA) plays a vital role in plant responses to multifarious stresses. However, the role of GABA in Fe deficiency responses and the potential mechanisms remain largely unknown in cucumber. Here, we found that Fe deficiency raised the GABA levels in leaves and roots of cucumber. To probe the role of GABA in Fe deficiency, the seedlings were subjected to five levels of GABA concentrations (0, 5, 10, 20 and 40 mmol L-1) for 7 days under Fe deficiency. The results demonstrated that 20 mM GABA in alleviating the Fe deficiency-induced stress was the most effective. GABA pretreatment reduced the Fe deficiency-induced chlorosis and inhibition of photosynthesis and growth, and significantly enhanced the contents of iron in shoots and roots. Exogenous GABA significantly decreased the pH of nutrient solution and increased ferric-chelate reductase (FCR) activity induced by Fe deficiency and the transcript levels of Fe uptake-related genes HA1, FRO2 and IRT1 in roots. GABA also increased the content of auxin (IAA) and expression of auxin biosynthesis (YUC4), response (IAA1), and transport (PIN1) genes under Fe deficiency. Furthermore, exogenous the auxin transport inhibitor 1-naphthylphthalamic acid (NPA) application abolished the GABA-induced changes in Fe deficiency. In summary, we found that GABA improves tolerance to iron deficiency via an auxin-dependent mechanism in cucumber.
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Affiliation(s)
- Zhixin Guo
- College of Horticulture, Henan Agricultural University, Zhengzhou, 450002, PR China
| | - Nanshan Du
- College of Horticulture, Henan Agricultural University, Zhengzhou, 450002, PR China
| | - Yingnan Li
- College of Horticulture, Henan Agricultural University, Zhengzhou, 450002, PR China
| | - Shuxin Zheng
- College of Horticulture, Henan Agricultural University, Zhengzhou, 450002, PR China
| | - Shunshan Shen
- College of Horticulture, Henan Agricultural University, Zhengzhou, 450002, PR China
| | - Fengzhi Piao
- College of Horticulture, Henan Agricultural University, Zhengzhou, 450002, PR China.
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50
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Hijaz F, Killiny N. The use of deuterium-labeled gamma-aminobutyric (D 6-GABA) to study uptake, translocation, and metabolism of exogenous GABA in plants. PLANT METHODS 2020; 16:24. [PMID: 32127911 PMCID: PMC7045438 DOI: 10.1186/s13007-020-00574-9] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/24/2019] [Accepted: 02/21/2020] [Indexed: 05/29/2023]
Abstract
BACKGROUND Exogenous application of gamma-aminobutyric acid (GABA) could relieve stress symptoms caused by abiotic stresses including anoxia, heat and cold shock, drought, and salt. However, studying translocation and metabolism of exogenous GABA is challenged by the presence of endogenous GABA. RESULTS Herein, we used D6-GABA in order to investigate the uptake, translocation, and the metabolism of exogenous GABA in Mexican lime (Citrus aurantifolia) seedlings using gas chromatography-mass spectrometry (GC-MS). The GC-MS analysis showed that D6-GABA could be easily distinguished from the non-labeled GABA after methyl chloroformate (MCF) derivatization. The D6-GABA was detected in the cortex (phloem), inner stem (xylem), and leaves after root drench. Girdling did not affect the translocation of D6-GABA, indicating that it is mainly translocated via the xylem. In addition, D4-labled succinic acid was detected in D6-GABA-treated plants, indicating that exogenous GABA was metabolized to succinic acid. The half-life of D6-GABA in citrus was about 1.3 h, indicating a quick conversion to succinic acid. CONCLUSION The use of D6-GABA offers a valuable tool to study the translocation and metabolism of GABA in plants. D6-GABA and its metabolite (D4-succinic acid) can be easily distinguished from the endogenous GABA and succinic acid using GC-MS.
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Affiliation(s)
- Faraj Hijaz
- Department of Plant Pathology, Citrus Research and Education Center, IFAS, University of Florida, 700 Experiment Station Road, Lake Alfred, FL 33850 USA
| | - Nabil Killiny
- Department of Plant Pathology, Citrus Research and Education Center, IFAS, University of Florida, 700 Experiment Station Road, Lake Alfred, FL 33850 USA
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