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Gonzalez S, Swift J, Yaaran A, Xu J, Miller C, Illouz-Eliaz N, Nery JR, Busch W, Zait Y, Ecker JR. Arabidopsis transcriptome responses to low water potential using high-throughput plate assays. eLife 2024; 12:RP84747. [PMID: 38904663 PMCID: PMC11192529 DOI: 10.7554/elife.84747] [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] [Indexed: 06/22/2024] Open
Abstract
Soil-free assays that induce water stress are routinely used to investigate drought responses in the plant Arabidopsis thaliana. Due to their ease of use, the research community often relies on polyethylene glycol (PEG), mannitol, and salt (NaCl) treatments to reduce the water potential of agar media, and thus induce drought conditions in the laboratory. However, while these types of stress can create phenotypes that resemble those of water deficit experienced by soil-grown plants, it remains unclear how these treatments compare at the transcriptional level. Here, we demonstrate that these different methods of lowering water potential elicit both shared and distinct transcriptional responses in Arabidopsis shoot and root tissue. When we compared these transcriptional responses to those found in Arabidopsis roots subject to vermiculite drying, we discovered many genes induced by vermiculite drying were repressed by low water potential treatments on agar plates (and vice versa). Additionally, we also tested another method for lowering water potential of agar media. By increasing the nutrient content and tensile strength of agar, we show the 'hard agar' (HA) treatment can be leveraged as a high-throughput assay to investigate natural variation in Arabidopsis growth responses to low water potential.
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Affiliation(s)
- Stephen Gonzalez
- Plant Biology Laboratory, The Salk Institute for Biological StudiesLa JollaUnited States
| | - Joseph Swift
- Plant Biology Laboratory, The Salk Institute for Biological StudiesLa JollaUnited States
| | - Adi Yaaran
- The Robert H. Smith Institute of Plant Sciences and Genetics in Agriculture, Faculty of Agriculture, Food, and Environment, The Hebrew University of JerusalemRehovotIsrael
| | - Jiaying Xu
- Plant Biology Laboratory, The Salk Institute for Biological StudiesLa JollaUnited States
| | - Charlotte Miller
- Plant Biology Laboratory, The Salk Institute for Biological StudiesLa JollaUnited States
| | - Natanella Illouz-Eliaz
- Plant Biology Laboratory, The Salk Institute for Biological StudiesLa JollaUnited States
| | - Joseph R Nery
- Genomic Analysis Laboratory, The Salk Institute for Biological StudiesLa JollaUnited States
| | - Wolfgang Busch
- Plant Biology Laboratory, The Salk Institute for Biological StudiesLa JollaUnited States
| | - Yotam Zait
- The Robert H. Smith Institute of Plant Sciences and Genetics in Agriculture, Faculty of Agriculture, Food, and Environment, The Hebrew University of JerusalemRehovotIsrael
| | - Joseph R Ecker
- Plant Biology Laboratory, The Salk Institute for Biological StudiesLa JollaUnited States
- Genomic Analysis Laboratory, The Salk Institute for Biological StudiesLa JollaUnited States
- Howard Hughes Medical Institute, The Salk Institute for Biological StudiesLa JollaUnited States
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2
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Dong D, Qi C, Zhang J, Deng Q, Xia P, Li P, Jia C, Zhao B, Zhang N, Guo YD. CsHSFA1d Promotes Drought Stress Tolerance by Increasing the Content of Raffinose Family Oligosaccharides and Scavenging Accumulated Reactive Oxygen Species in Cucumber. PLANT & CELL PHYSIOLOGY 2024; 65:809-822. [PMID: 38564325 DOI: 10.1093/pcp/pcae023] [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: 07/17/2023] [Revised: 01/31/2024] [Accepted: 03/04/2024] [Indexed: 04/04/2024]
Abstract
Drought is the most severe form of stress experienced by plants worldwide. Cucumber is a vegetable crop that requires a large amount of water throughout the growth period. In our previous study, we identified that overexpression of CsHSFA1d could improve cold tolerance and the content of endogenous jasmonic acid in cucumber seedlings. To explore the functional diversities of CsHSFA1d, we treat the transgenic plants under drought conditions. In this study, we found that the heat shock transcription factor HSFA1d (CsHSFA1d) could improve drought stress tolerance in cucumber. CsHSFA1d overexpression increased the expression levels of galactinol synthase (CsGolS3) and raffinose synthase (CsRS) genes, encoding the key enzymes for raffinose family oligosaccharide (RFO) biosynthesis. Furthermore, the lines overexpressing CsHSFA1d showed higher enzymatic activity of GolS and raffinose synthase to increase the content of RFO. Moreover, the CsHSFA1d-overexpression lines showed lower reactive oxygen species (ROS) accumulation and higher ROS-scavenging enzyme activity after drought treatment. The expressions of antioxidant genes CsPOD2, CsAPX1 and CsSOD1 were also upregulated in CsHSFA1d-overexpression lines. The expression levels of stress-responsive genes such as CsRD29A, CsLEA3 and CsP5CS1 were increased in CsHSFA1d-overexpression lines after drought treatment. We conclude that CsHSFA1d directly targets and regulates the expression of CsGolS3 and CsRS to promote the enzymatic activity and accumulation of RFO to increase the tolerance to drought stress. CsHSFA1d also improves ROS-scavenging enzyme activity and gene expression indirectly to reduce drought-induced ROS overaccumulation. This study therefore offers a new gene target to improve drought stress tolerance in cucumber and revealed the underlying mechanism by which CsHSFA1d functions in the drought stress by increasing the content of RFOs and scavenging the excessive accumulation of ROS.
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Affiliation(s)
- Danhui Dong
- College of Horticulture, China Agricultural University, Beijing HaiDian District, Yuanmingyuanxilu No. 2, Beijing 100193, China
| | - Chuandong Qi
- Institute of Economic Crops, Hubei Academy of Agricultural Sciences, Wuhan Hongshan District, Nanhudadao No. 43, Wuhan, Hubei Province 430064, China
| | - Jialong Zhang
- College of Horticulture, China Agricultural University, Beijing HaiDian District, Yuanmingyuanxilu No. 2, Beijing 100193, China
| | - Qilin Deng
- College of Horticulture, China Agricultural University, Beijing HaiDian District, Yuanmingyuanxilu No. 2, Beijing 100193, China
| | - Pingxin Xia
- College of Horticulture, China Agricultural University, Beijing HaiDian District, Yuanmingyuanxilu No. 2, Beijing 100193, China
| | - Ping Li
- College of Horticulture, China Agricultural University, Beijing HaiDian District, Yuanmingyuanxilu No. 2, Beijing 100193, China
| | - Congyang Jia
- College of Horticulture, China Agricultural University, Beijing HaiDian District, Yuanmingyuanxilu No. 2, Beijing 100193, China
| | - Bing Zhao
- College of Horticulture, China Agricultural University, Beijing HaiDian District, Yuanmingyuanxilu No. 2, Beijing 100193, China
| | - Na Zhang
- College of Horticulture, China Agricultural University, Beijing HaiDian District, Yuanmingyuanxilu No. 2, Beijing 100193, China
| | - Yang-Dong Guo
- College of Horticulture, China Agricultural University, Beijing HaiDian District, Yuanmingyuanxilu No. 2, Beijing 100193, China
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3
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Liao Y, Wang Z, Pei Y, Yan S, Chen T, Qi B, Li Y. Unveiling the applications of membrane proteins from oil bodies: leading the way in artificial oil body technology and other biotechnological advancements. Crit Rev Food Sci Nutr 2024:1-28. [PMID: 38594966 DOI: 10.1080/10408398.2024.2331566] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/11/2024]
Abstract
Oil bodies (OBs) function as organelles that store lipids in plant seeds. An oil body (OB) is encased by a membrane composed of proteins (e.g., oleosins, caleosins, and steroleosins) and a phospholipid monolayer. The distinctive protein-phospholipid membrane architecture of OBs imparts exceptional stability even in extreme environments, thereby sparking increasing interest in their structure and properties. However, a comprehensive understanding of the structure-activity relationships determining the stability and properties of oil bodies requires a more profound exploration of the associated membrane proteins, an aspect that remains relatively unexplored. In this review, we aim to summarize and discuss the structural attributes, biological functions, and properties of OB membrane proteins. From a commercial perspective, an in-depth understanding of the structural and functional properties of OBs is important for the expansion of their applications by producing artificial oil bodies (AOB). Besides exploring their structural intricacies, we describe various methods that are used for purifying and isolating OB membrane proteins. These insights may provide a foundational framework for the practical utilization of OB membrane proteins in diverse applications within the realm of AOB technology, including biological and probiotic delivery, protein purification, enzyme immobilization, astringency detection, and antibody production.
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Affiliation(s)
- Yi Liao
- College of Food Science, Northeast Agricultural University, Harbin, Heilongjiang, China
| | - Zhenxiao Wang
- College of Food Science, Northeast Agricultural University, Harbin, Heilongjiang, China
| | - Yukun Pei
- College of Food Science, Northeast Agricultural University, Harbin, Heilongjiang, China
| | - Shizhang Yan
- College of Food Science, Northeast Agricultural University, Harbin, Heilongjiang, China
| | - Tianyao Chen
- College of Food Science, Northeast Agricultural University, Harbin, Heilongjiang, China
| | - Baokun Qi
- College of Food Science, Northeast Agricultural University, Harbin, Heilongjiang, China
| | - Yang Li
- College of Food Science, Northeast Agricultural University, Harbin, Heilongjiang, China
- Intelligent Equipment Research Center for the Development of Special Medicinal and Food Resources, Harbin Institute of Technology Chongqing Research Institute, Chongqing, China
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4
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Han B, Yan J, Wu T, Yang X, Wang Y, Ding G, Hammond J, Wang C, Xu F, Wang S, Shi L. Proteomics reveals the significance of vacuole Pi transporter in the adaptability of Brassica napus to Pi deprivation. FRONTIERS IN PLANT SCIENCE 2024; 15:1340867. [PMID: 38590751 PMCID: PMC11000671 DOI: 10.3389/fpls.2024.1340867] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/19/2023] [Accepted: 03/04/2024] [Indexed: 04/10/2024]
Abstract
Vacuolar Pi transporters (VPTs) have recently been identified as important regulators of cellular Pi status in Arabidopsis thaliana and Oryza sativa. In the oil crop Brassica napus, BnA09PHT5;1a and BnC09PHT5;1a are two homologs of AtPHT5;1, the vacuolar Pi influx transporter in Arabidopsis. Here, we show that Pi deficiency induces the transcription of both homologs of PHT5;1a genes in B. napus leaves. Brassica PHT5;1a double mutants (DM) had smaller shoots and higher cellular Pi concentrations than wild-type (WT, Westar 10), suggesting the potential role of BnPHT5;1a in modulating cellular Pi status in B. napus. A proteomic analysis was performed to estimate the role of BnPHT5;1a in Pi fluctuation. Results show that Pi deprivation disturbs the abundance of proteins in the physiological processes involved in carbohydrate metabolism, response to stimulus and stress in B. napus, while disruption of BnPHT5;1a genes may exacerbate these processes. Besides, the processes of cell redox homeostasis, lipid metabolic and proton transmembrane transport are supposed to be unbalanced in BnPHT5;1a DM under the -Pi condition. Noteworthy, disruption of BnPHT5;1a genes severely alters the abundance of proteins related to ATP biosynthesis, and proton/inorganic cation transmembrane under normal Pi condition, which might contribute to B. napus growth limitations. Additionally, seven new protein markers of Pi homeostasis are identified in B. napus. Taken together, this study characterizes the important regulatory role of BnPHT5;1a genes as vacuolar Pi influx transporters in Pi homeostasis in B. napus.
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Affiliation(s)
- Bei Han
- National Key Laboratory of Crop Genetic Improvement, Huazhong Agricultural University, Wuhan, China
- ZJU-Hangzhou Global Scientific and Technological Innovation Center, Zhejiang University, Hangzhou, Zhejiang, China
| | - Junjun Yan
- National Key Laboratory of Crop Genetic Improvement, Huazhong Agricultural University, Wuhan, China
| | - Tao Wu
- National Key Laboratory of Crop Genetic Improvement, Huazhong Agricultural University, Wuhan, China
- Microelement Research Center, College of Resources & Environment, Huazhong Agricultural University, Wuhan, China
| | - Xinyu Yang
- National Key Laboratory of Crop Genetic Improvement, Huazhong Agricultural University, Wuhan, China
- Microelement Research Center, College of Resources & Environment, Huazhong Agricultural University, Wuhan, China
| | - Yajie Wang
- National Key Laboratory of Crop Genetic Improvement, Huazhong Agricultural University, Wuhan, China
- Microelement Research Center, College of Resources & Environment, Huazhong Agricultural University, Wuhan, China
| | - Guangda Ding
- National Key Laboratory of Crop Genetic Improvement, Huazhong Agricultural University, Wuhan, China
- Microelement Research Center, College of Resources & Environment, Huazhong Agricultural University, Wuhan, China
| | - John Hammond
- School of Agriculture, Policy and Development, University of Reading, Reading, United Kingdom
| | - Chuang Wang
- Microelement Research Center, College of Resources & Environment, Huazhong Agricultural University, Wuhan, China
| | - Fangsen Xu
- National Key Laboratory of Crop Genetic Improvement, Huazhong Agricultural University, Wuhan, China
- Microelement Research Center, College of Resources & Environment, Huazhong Agricultural University, Wuhan, China
| | - Sheliang Wang
- National Key Laboratory of Crop Genetic Improvement, Huazhong Agricultural University, Wuhan, China
- Microelement Research Center, College of Resources & Environment, Huazhong Agricultural University, Wuhan, China
| | - Lei Shi
- National Key Laboratory of Crop Genetic Improvement, Huazhong Agricultural University, Wuhan, China
- Microelement Research Center, College of Resources & Environment, Huazhong Agricultural University, Wuhan, China
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5
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Brunetti SC, Arseneault MKM, Gulick PJ. The caleosin RD20/CLO3 regulates lateral root development in response to abscisic acid and regulates flowering time in conjunction with the caleosin CLO7. JOURNAL OF PLANT PHYSIOLOGY 2023; 290:154102. [PMID: 37812854 DOI: 10.1016/j.jplph.2023.154102] [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: 04/28/2023] [Revised: 09/07/2023] [Accepted: 09/23/2023] [Indexed: 10/11/2023]
Abstract
The caleosins are encoded by multi-gene families in Arabidopsis thaliana and other plant species. This work investigates the role of two family members, RD20/CLO3 and CLO7, in flowering transition and in root development in response to ABA treatment. Gene expression of the caleosin RD20/CLO3 is induced by ABA in the root tissues and RD20/CLO3 has a negative affect on the total number of lateral roots as well as the length of the lateral roots in response to ABA treatment. The rd20/clo3 mutant has more and longer lateral roots in response to ABA treatment compared to the wild-type, showing that RD20/CLO3 plays a role in the ABA signaling pathway affecting this trait. In contrast, the caleosin CLO7 is not expressed in the roots and does not affect root architecture in response to ABA treatment. The disruption of both RD20/CLO3 and CLO7 together causes a dramatic early-flowering phenotype under long-day conditions, whereas single mutations in these genes do not affect flowering time under these conditions. Both yeast two-hybrid and bimolecular fluorescence complementation showed that both RD20/CLO3 and CLO7 interact with each other and can form homodimers and heterodimers. Taken together, these findings suggest that members of the caleosin gene family play both different and redundant roles in plant development.
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Affiliation(s)
- Sabrina C Brunetti
- Biology Department, Concordia University, 7141 Sherbrooke W, Montreal, Quebec, H4B 1R6, Canada
| | - Michelle K M Arseneault
- Biology Department, Concordia University, 7141 Sherbrooke W, Montreal, Quebec, H4B 1R6, Canada
| | - Patrick J Gulick
- Biology Department, Concordia University, 7141 Sherbrooke W, Montreal, Quebec, H4B 1R6, Canada.
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6
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Huang J, Staes A, Impens F, Demichev V, Van Breusegem F, Gevaert K, Willems P. CysQuant: Simultaneous quantification of cysteine oxidation and protein abundance using data dependent or independent acquisition mass spectrometry. Redox Biol 2023; 67:102908. [PMID: 37793239 PMCID: PMC10562924 DOI: 10.1016/j.redox.2023.102908] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/13/2023] [Revised: 09/20/2023] [Accepted: 09/26/2023] [Indexed: 10/06/2023] Open
Abstract
Protein cysteinyl thiols are susceptible to reduction-oxidation reactions that can influence protein function. Accurate quantification of cysteine oxidation is therefore crucial for decoding protein redox regulation. Here, we present CysQuant, a novel approach for simultaneous quantification of cysteine oxidation degrees and protein abundancies. CysQuant involves light/heavy iodoacetamide isotopologues for differential labeling of reduced and reversibly oxidized cysteines analyzed by data-dependent acquisition (DDA) or data-independent acquisition mass spectrometry (DIA-MS). Using plexDIA with in silico predicted spectral libraries, we quantified an average of 18% cysteine oxidation in Arabidopsis thaliana by DIA-MS, including a subset of highly oxidized cysteines forming disulfide bridges in AlphaFold2 predicted structures. Applying CysQuant to Arabidopsis seedlings exposed to excessive light, we successfully quantified the well-established increased reduction of Calvin-Benson cycle enzymes and discovered yet uncharacterized redox-sensitive disulfides in chloroplastic enzymes. Overall, CysQuant is a highly versatile tool for assessing the cysteine modification status that can be widely applied across various mass spectrometry platforms and organisms.
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Affiliation(s)
- Jingjing Huang
- Department of Plant Biotechnology and Bioinformatics, Ghent University, 9052, Ghent, Belgium; Center for Plant Systems Biology, VIB, 9052, Ghent, Belgium
| | - An Staes
- Department of Biomolecular Medicine, Ghent University, 9052, Ghent, Belgium; Center for Medical Biotechnology, VIB, 9052, Ghent, Belgium; VIB Proteomics Core, 9052, Ghent, Belgium
| | - Francis Impens
- Department of Biomolecular Medicine, Ghent University, 9052, Ghent, Belgium; Center for Medical Biotechnology, VIB, 9052, Ghent, Belgium; VIB Proteomics Core, 9052, Ghent, Belgium
| | - Vadim Demichev
- Department of Biochemistry, Charité - Universitätsmedizin Berlin, 10117, Berlin, Germany
| | - Frank Van Breusegem
- Department of Plant Biotechnology and Bioinformatics, Ghent University, 9052, Ghent, Belgium; Center for Plant Systems Biology, VIB, 9052, Ghent, Belgium
| | - Kris Gevaert
- Department of Biomolecular Medicine, Ghent University, 9052, Ghent, Belgium; Center for Medical Biotechnology, VIB, 9052, Ghent, Belgium.
| | - Patrick Willems
- Department of Plant Biotechnology and Bioinformatics, Ghent University, 9052, Ghent, Belgium; Center for Plant Systems Biology, VIB, 9052, Ghent, Belgium; Department of Biomolecular Medicine, Ghent University, 9052, Ghent, Belgium; Center for Medical Biotechnology, VIB, 9052, Ghent, Belgium.
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7
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Zhang Y, Li P, Niu Y, Zhang Y, Wen G, Zhao C, Jiang M. Evolution of the WRKY66 Gene Family and Its Mutations Generated by the CRISPR/Cas9 System Increase the Sensitivity to Salt Stress in Arabidopsis. Int J Mol Sci 2023; 24:3071. [PMID: 36834483 PMCID: PMC9959582 DOI: 10.3390/ijms24043071] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2023] [Revised: 01/29/2023] [Accepted: 02/01/2023] [Indexed: 02/09/2023] Open
Abstract
Group Ⅲ WRKY transcription factors (TFs) play pivotal roles in responding to the diverse abiotic stress and secondary metabolism of plants. However, the evolution and function of WRKY66 remains unclear. Here, WRKY66 homologs were traced back to the origin of terrestrial plants and found to have been subjected to both motifs' gain and loss, and purifying selection. A phylogenetic analysis showed that 145 WRKY66 genes could be divided into three main clades (Clade A-C). The substitution rate tests indicated that the WRKY66 lineage was significantly different from others. A sequence analysis displayed that the WRKY66 homologs had conserved WRKY and C2HC motifs with higher proportions of crucial amino acid residues in the average abundance. The AtWRKY66 is a nuclear protein, salt- and ABA- inducible transcription activator. Simultaneously, under salt stress and ABA treatments, the superoxide dismutase (SOD), peroxidase (POD) and catalase (CAT) activities, as well as the seed germination rates of Atwrky66-knockdown plants generated by the clustered, regularly interspaced, short palindromic repeats/CRISPR-associated 9 (CRISPR/Cas9) system, were all lower than those of wild type (WT) plants, but the relative electrolyte leakage (REL) was higher, indicating the increased sensitivities of the knockdown plants to the salt stress and ABA treatments. Moreover, RNA-seq and qRT-PCR analyses revealed that several regulatory genes in the ABA-mediated signaling pathway involved in stress response of the knockdown plants were significantly regulated, being evidenced by the more moderate expressions of the genes. Therefore, the AtWRKY66 likely acts as a positive regulator in the salt stress response, which may be involved in an ABA-mediated signaling pathway.
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Affiliation(s)
- Youze Zhang
- Ministry of Education Key Laboratory for Biodiversity Science and Ecological Engineering, Center for Evolutionary Biology, School of Life Sciences, Fudan University, Shanghai 200438, China
- State Key Laboratory of Tea Plant Biology and Utilization, Anhui Agricultural University, Hefei 230036, China
| | - Peng Li
- Shanghai Key Laboratory of Plant Functional Genomics and Resources, Shanghai Chenshan Botanical Garden, Shanghai 201602, China
| | - Yuqian Niu
- Ministry of Education Key Laboratory for Biodiversity Science and Ecological Engineering, Center for Evolutionary Biology, School of Life Sciences, Fudan University, Shanghai 200438, China
| | - Yuxin Zhang
- Ministry of Education Key Laboratory for Biodiversity Science and Ecological Engineering, Center for Evolutionary Biology, School of Life Sciences, Fudan University, Shanghai 200438, China
| | - Guosong Wen
- Research & Development Center for Heath Product, College of Agronomy and Biotechnology, Yunnan Agricultural University, Kunming 650201, China
| | - Changling Zhao
- Research & Development Center for Heath Product, College of Agronomy and Biotechnology, Yunnan Agricultural University, Kunming 650201, China
| | - Min Jiang
- Ministry of Education Key Laboratory for Biodiversity Science and Ecological Engineering, Center for Evolutionary Biology, School of Life Sciences, Fudan University, Shanghai 200438, China
- Shanghai Key Laboratory of Plant Functional Genomics and Resources, Shanghai Chenshan Botanical Garden, Shanghai 201602, China
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8
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Deng H, Li Q, Cao R, Ren Y, Wang G, Guo H, Bu S, Liu J, Ma P. Overexpression of SmMYC2 enhances salt resistance in Arabidopsis thaliana and Salvia miltiorrhiza hairy roots. JOURNAL OF PLANT PHYSIOLOGY 2023; 280:153862. [PMID: 36399834 DOI: 10.1016/j.jplph.2022.153862] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/31/2022] [Revised: 10/26/2022] [Accepted: 11/04/2022] [Indexed: 06/16/2023]
Abstract
Soil salinity significantly affects both Salvia miltiorrhiza growth and development as well as seed germination throughout field cultivation and production. The basic helix-loop-helix (bHLH) transcription factor (TF) MYC2 contributes significantly to plant stress resistance as a key regulator of the jasmonic acid signaling pathway. In transgenic S. miltiorrhiza hairy roots, SmMYC2 has been shown to promote the accumulation of tanshinone and salvianolic acid, but its role in S. miltiorrhiza of resistance to abiotic stress is unclear. Herein, we found methyl jasmonate (MeJA), NaCl, and PEG treatment all significantly increased SmMYC2 expression. In response to salt stress, SmMYC2 overexpression in yeast increased its rate of growth. Additionally, overexpression of SmMYC2 transgenic Arabidopsis thaliana and S. miltiorrhiza hairy root showed that it might improve salt resistance in transgenic plant. In particular, compared to WT, overexpression of SmMYC2 transgenic Arabidopsis had higher levels of three antioxidant enzymes (superoxide dismutase (SOD), peroxidase (POD), and catalase (CAT)), proline (Pro) content, and ABA-dependent and ABA-independent genes expression. They also had lower levels of malondialdehyde (MDA) and reactive oxygen species (ROS) accumulation. What's more, overexpression of SmMYC2 increases the expression of flavonoid synthesis genes and the accumulation of related components in Arabidopsis. These findings imply that SmMYC2 functions as a positive regulator that regulates plant tolerance to salt through ABA-dependent and independent signaling pathways.
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Affiliation(s)
- Huaiyu Deng
- College of Chemistry and Pharmacy, Northwest A&F University, Yangling, China
| | - Qi Li
- College of Life Sciences, Northwest A&F University, Yangling, China
| | - Ruizhi Cao
- College of Life Sciences, Northwest A&F University, Yangling, China
| | - Yafei Ren
- College of Life Sciences, Northwest A&F University, Yangling, China
| | - Guanfeng Wang
- College of Life Sciences, Northwest A&F University, Yangling, China
| | - Hongbo Guo
- College of Chemistry and Pharmacy, Northwest A&F University, Yangling, China
| | - Shuhai Bu
- College of Life Sciences, Northwest A&F University, Yangling, China.
| | - Jingying Liu
- College of Life Sciences, Northwest A&F University, Yangling, China.
| | - Pengda Ma
- College of Life Sciences, Northwest A&F University, Yangling, China.
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9
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Brunetti SC, Arseneault MKM, Gulick PJ. The caleosin CLO7 and its role in the heterotrimeric G-protein signalling network. JOURNAL OF PLANT PHYSIOLOGY 2022; 279:153841. [PMID: 36334585 DOI: 10.1016/j.jplph.2022.153841] [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: 06/18/2022] [Revised: 10/07/2022] [Accepted: 10/08/2022] [Indexed: 06/16/2023]
Abstract
The investigation of the caleosin CLO7 in relation to heterotrimeric G-protein signalling in Arabidopsis showed that the gene plays a role in seed germination and embryo viability. The caleosin CLO7 belongs to a multi-gene family of calcium-binding proteins which are characterized by single EF-hand motifs. Other members of the caleosin gene family have been shown to affect transpiration and seed germination as well as play a role in both abiotic and biotic stress responses. The proteins are associated with lipid droplets/oil bodies and some members of the gene family have been shown to have peroxygenase activity. Members of the gene family have also been shown to interact with the α subunit of the heterotrimeric G protein complex. In this study, we further expand on the diversity of physiological responses in which members of this gene family play regulatory roles. Utilizing BiFC and Y2H protein-protein interaction assays, CLO7 is identified as an interactor of the heterotrimeric G protein α subunit, GPA1. The full-length CLO7 is shown to interact with both the wild-type GPA1 and its constitutively active form, GPA1QL, at the plasma membrane. Point mutations to critical amino acids for calcium binding in the EF-hand of CLO7 indicate that the interaction with GPA1 is calcium-dependent and that the interaction with GPA1QL is enhanced by calcium. Protein-protein interaction assays also show that CLO7 interacts with Pirin1, a member of the cupin gene superfamily and a known downstream effector of GPA1, and this interaction is calcium-dependent. The N-terminal portion of CLO7 is responsible for these interactions. GFP-tagged CLO7 protein localizes to the endoplasmic reticulum (ER) and to lipid bodies. Characterization of the clo7 mutant line has shown that CLO7 is implicated in the abscisic acid (ABA) and mannitol-mediated inhibition of seed germination, with the clo7 mutant displaying higher germination rates in response to osmotic stress and ABA hormone treatment. These results provide insight into the role of CLO7 in seed germination in response to abiotic stress as well as its interaction with GPA1 and Pirin1. CLO7 also plays a role in embryo viability with the clo7gpa1 double mutant displaying embryo lethality, and therefore the double mutant cannot be recovered.
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Affiliation(s)
- Sabrina C Brunetti
- Biology Department, Concordia University, 7141 Sherbrooke W. Montreal (Quebec) H4B 1R6, Canada
| | - Michelle K M Arseneault
- Biology Department, Concordia University, 7141 Sherbrooke W. Montreal (Quebec) H4B 1R6, Canada
| | - Patrick J Gulick
- Biology Department, Concordia University, 7141 Sherbrooke W. Montreal (Quebec) H4B 1R6, Canada.
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10
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Ghanbari Moheb Seraj R, Tohidfar M, Azimzadeh Irani M, Esmaeilzadeh-Salestani K, Moradian T, Ahmadikhah A, Behnamian M. Metabolomics analysis of milk thistle lipids to identify drought-tolerant genes. Sci Rep 2022; 12:12827. [PMID: 35896570 PMCID: PMC9329356 DOI: 10.1038/s41598-022-16887-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2021] [Accepted: 07/18/2022] [Indexed: 11/09/2022] Open
Abstract
Milk thistle is an oil and medicinal crop known as an alternative oil crop with a high level of unsaturated fatty acids, which makes it a favorable edible oil for use in food production. To evaluate the importance of Milk thistle lipids in drought tolerance, an experiment was performed in field conditions under three different water deficit levels (Field capacity (FC), 70% FC and 40% FC). After harvesting seeds of the plant, their oily and methanolic extracts were isolated, and subsequently, types and amounts of lipids were measured using GC-MS. Genes and enzymes engaged in biosynthesizing of these lipids were identified and their expression in Arabidopsis was investigated under similar conditions. The results showed that content of almost all measured lipids of milk thistle decreased under severe drought stress, but genes (belonged to Arabidopsis), which were involved in their biosynthetic pathway showed different expression patterns. Genes biosynthesizing lipids, which had significant amounts were selected and their gene and metabolic network were established. Two networks were correlated, and for each pathway, their lipids and respective biosynthesizing genes were grouped together. Four up-regulated genes including PXG3, LOX2, CYP710A1, PAL and 4 down-regulated genes including FATA2, CYP86A1, LACS3, PLA2-ALPHA were selected. The expression of these eight genes in milk thistle was similar to Arabidopsis under drought stress. Thus, PXG3, PAL, LOX2 and CYP86A1 genes that increased expression were selected for protein analysis. Due to the lack of protein structure of these genes in the milk thistle, modeling homology was performed for them. The results of molecular docking showed that the four proteins CYP86A1, LOX2, PAL and PXG3 bind to ligands HEM, 11O, ACT and LIG, respectively. HEM ligand was involved in production of secondary metabolites and dehydration tolerance, and HEM binding site remained conserved in various plants. CA ligands were involved in synthesis of cuticles and waxes. Overall, this study confirmed the importance of lipids in drought stress tolerance in milk thistle.
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Affiliation(s)
- Rahele Ghanbari Moheb Seraj
- Department of Horticultural Sciences, Faculty of Agriculture and Natural Resources, University of Mohaghegh Ardabili, Ardabil, Iran
| | - Masoud Tohidfar
- Department of Plant Biotechnology, Faculty of Life Sciences and Biotechnology, Shahid Beheshti University, Tehran, Iran.
| | | | - Keyvan Esmaeilzadeh-Salestani
- Chair of Crop Science and Plant Biology, Institute of Agricultural and Environmental Sciences, Estonian University of Life Sciences, Fr. R. Kreutzwaldi 1, 51014, Tartu, Estonia
| | - Toktam Moradian
- Department of Horticultural Sciences, Islamic Azad University, Shirvan Branch, Shirvan, Iran
| | - Asadollah Ahmadikhah
- Department of Plant Biotechnology, Faculty of Life Sciences and Biotechnology, Shahid Beheshti University, Tehran, Iran
| | - Mahdi Behnamian
- Department of Horticultural Sciences, Faculty of Agriculture and Natural Resources, University of Mohaghegh Ardabili, Ardabil, Iran
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11
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Liu X, Yang Z, Wang Y, Shen Y, Jia Q, Zhao C, Zhang M. Multiple caleosins have overlapping functions in oil accumulation and embryo development. JOURNAL OF EXPERIMENTAL BOTANY 2022; 73:3946-3962. [PMID: 35419601 DOI: 10.1093/jxb/erac153] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/22/2022] [Accepted: 04/08/2022] [Indexed: 06/14/2023]
Abstract
Caleosins are lipid droplet- and endoplasmic reticulum-associated proteins. To investigate their functions in oil accumulation, expression levels of caleosins in developing seeds of Arabidopsis thaliana were examined and four seed-expressed caleosins (CLO1, CLO2, CLO4, and CLO6) were identified. The four single mutants showed similar minor changes of fatty acid composition in seeds. Two double mutants (clo1 clo2 and clo1×clo2) demonstrated distinct changes of fatty acid composition, a 16-23% decrease of oil content, and a 10-13% decrease of seed weight. Moreover, a 40% decrease of oil content, further fatty acid changes, and misshapen membranes of smaller lipid droplets were found in seeds of quadruple CLO RNAi lines. Notably, ~40% of quadruple CLO RNAi T1 seeds failed to germinate, and deformed embryos and seedlings were also observed. Complementation experiments showed that CLO1 rescued the phenotype of clo1 clo2. Overexpression of CLO1 in seedlings and BY2 cells increased triacylglycerol content up to 73.6%. Transcriptome analysis of clo1 clo2 developing seeds showed that expression levels of some genes related to lipid, embryo development, calcium signaling, and stress responses were affected. Together, these results suggest that the major seed-expressed caleosins have overlapping functions in oil accumulation and show pleiotropic effects on embryo development.
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Affiliation(s)
- Xiangling Liu
- College of Agronomy, Northwest A&F University, Yangling, Shaanxi 712100, China
| | | | - Yun Wang
- College of Agronomy, Northwest A&F University, Yangling, Shaanxi 712100, China
| | | | - Qingli Jia
- College of Agronomy, Northwest A&F University, Yangling, Shaanxi 712100, China
| | - Cuizhu Zhao
- College of Agronomy, Northwest A&F University, Yangling, Shaanxi 712100, China
| | - Meng Zhang
- College of Agronomy, Northwest A&F University, Yangling, Shaanxi 712100, China
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12
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Saeed F, Chaudhry UK, Bakhsh A, Raza A, Saeed Y, Bohra A, Varshney RK. Moving Beyond DNA Sequence to Improve Plant Stress Responses. Front Genet 2022; 13:874648. [PMID: 35518351 PMCID: PMC9061961 DOI: 10.3389/fgene.2022.874648] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2022] [Accepted: 03/31/2022] [Indexed: 01/25/2023] Open
Abstract
Plants offer a habitat for a range of interactions to occur among different stress factors. Epigenetics has become the most promising functional genomics tool, with huge potential for improving plant adaptation to biotic and abiotic stresses. Advances in plant molecular biology have dramatically changed our understanding of the molecular mechanisms that control these interactions, and plant epigenetics has attracted great interest in this context. Accumulating literature substantiates the crucial role of epigenetics in the diversity of plant responses that can be harnessed to accelerate the progress of crop improvement. However, harnessing epigenetics to its full potential will require a thorough understanding of the epigenetic modifications and assessing the functional relevance of these variants. The modern technologies of profiling and engineering plants at genome-wide scale provide new horizons to elucidate how epigenetic modifications occur in plants in response to stress conditions. This review summarizes recent progress on understanding the epigenetic regulation of plant stress responses, methods to detect genome-wide epigenetic modifications, and disentangling their contributions to plant phenotypes from other sources of variations. Key epigenetic mechanisms underlying stress memory are highlighted. Linking plant response with the patterns of epigenetic variations would help devise breeding strategies for improving crop performance under stressed scenarios.
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Affiliation(s)
- Faisal Saeed
- Department of Agricultural Genetic Engineering, Faculty of Agricultural Sciences and Technologies, Nigde Omer Halisdemir University, Nigde, Turkey
| | - Usman Khalid Chaudhry
- Department of Agricultural Genetic Engineering, Faculty of Agricultural Sciences and Technologies, Nigde Omer Halisdemir University, Nigde, Turkey
| | - Allah Bakhsh
- Centre of Excellence in Molecular Biology, University of the Punjab, Lahore, Pakistan
| | - Ali Raza
- Key Laboratory of Ministry of Education for Genetics, Breeding and Multiple Utilization of Crops, Oil Crops Research Institute, Center of Legume Crop Genetics and Systems Biology/College of Agriculture, Fujian Agriculture and Forestry University (FAFU), Fuzhou, China
| | - Yasir Saeed
- Department of Plant Pathology, Faculty of Agriculture, University of Agriculture, Faisalabad, Pakistan
| | - Abhishek Bohra
- State Agricultural Biotechnology Centre, Centre for Crop and Food Innovation, Murdoch University, Murdoch, WA, Australia
| | - Rajeev K. Varshney
- Key Laboratory of Ministry of Education for Genetics, Breeding and Multiple Utilization of Crops, Oil Crops Research Institute, Center of Legume Crop Genetics and Systems Biology/College of Agriculture, Fujian Agriculture and Forestry University (FAFU), Fuzhou, China
- State Agricultural Biotechnology Centre, Centre for Crop and Food Innovation, Murdoch University, Murdoch, WA, Australia
- Center of Excellence in Genomics & Systems Biology, International Crops Research Institute for the Semi-Arid Tropics (ICRISAT), Hyderabad, India
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13
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Gawande ND, Hamiditabar Z, Brunetti SC, Gulick PJ. Characterization of the heterotrimeric G protein gene families in Triticum aestivum and related species. 3 Biotech 2022; 12:99. [PMID: 35463045 PMCID: PMC8938547 DOI: 10.1007/s13205-022-03156-9] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2021] [Accepted: 03/01/2022] [Indexed: 11/27/2022] Open
Abstract
This study characterizes the heterotrimeric G protein gene families in Triticum aestivum, their tissue-specific expression patterns during development and in response to biotic and abiotic stress conditions. There are three Gα genes, three Gβ and 12 Gγ genes, totaling 18 genes encoding heterotrimeric G proteins in the hexaploid wheat genome. Each haploid genome of the hexaploid T. aestivum has a single gene encoding the α subunit of the heterotrimeric G protein complex, GA1, a single Gβ and four Gγ genes. Each gene has three homeologous copies in the A, B and D genomes. The physical interaction between the Gβ (Gpb) and two Gγ subunits, Gpg1 and Gpg2, was shown through bimolecular fluorescence complementation (BiFC). The gene expression in response to biotic and abiotic stresses showed both up-regulation and down-regulation of members of the gene families. Gγ2-B and Gγ2-D are significantly upregulated during heat stress, GA1-D is upregulated by cold stress and Gγ1-A and Gγ1-D were upregulated by Fusarium graminearum inoculation in a F. graminearum resistant cultivar. This suggests that these members may play roles in biotic and abiotic signaling pathways and the roles of these genes within these pathways need further investigation. Supplementary Information The online version contains supplementary material available at 10.1007/s13205-022-03156-9.
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Affiliation(s)
- Nilesh D. Gawande
- Biology Department, Concordia University, 7141 Sherbrooke W, Montreal, QB H4B 1R6 Canada
| | - Zeynab Hamiditabar
- Biology Department, Concordia University, 7141 Sherbrooke W, Montreal, QB H4B 1R6 Canada
| | - Sabrina C. Brunetti
- Biology Department, Concordia University, 7141 Sherbrooke W, Montreal, QB H4B 1R6 Canada
| | - Patrick J. Gulick
- Biology Department, Concordia University, 7141 Sherbrooke W, Montreal, QB H4B 1R6 Canada
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14
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Wang Y, Botella JR. Heterotrimeric G Protein Signaling in Abiotic Stress. PLANTS 2022; 11:plants11070876. [PMID: 35406855 PMCID: PMC9002505 DOI: 10.3390/plants11070876] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/01/2022] [Revised: 03/17/2022] [Accepted: 03/21/2022] [Indexed: 11/16/2022]
Abstract
As sessile organisms, plants exhibit extraordinary plasticity and have evolved sophisticated mechanisms to adapt and mitigate the adverse effects of environmental fluctuations. Heterotrimeric G proteins (G proteins), composed of α, β, and γ subunits, are universal signaling molecules mediating the response to a myriad of internal and external signals. Numerous studies have identified G proteins as essential components of the organismal response to stress, leading to adaptation and ultimately survival in plants and animal systems. In plants, G proteins control multiple signaling pathways regulating the response to drought, salt, cold, and heat stresses. G proteins signal through two functional modules, the Gα subunit and the Gβγ dimer, each of which can start either independent or interdependent signaling pathways. Improving the understanding of the role of G proteins in stress reactions can lead to the development of more resilient crops through traditional breeding or biotechnological methods, ensuring global food security. In this review, we summarize and discuss the current knowledge on the roles of the different G protein subunits in response to abiotic stress and suggest future directions for research.
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15
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Sarraf M, Vishwakarma K, Kumar V, Arif N, Das S, Johnson R, Janeeshma E, Puthur JT, Aliniaeifard S, Chauhan DK, Fujita M, Hasanuzzaman M. Metal/Metalloid-Based Nanomaterials for Plant Abiotic Stress Tolerance: An Overview of the Mechanisms. PLANTS (BASEL, SWITZERLAND) 2022; 11:316. [PMID: 35161297 PMCID: PMC8839771 DOI: 10.3390/plants11030316] [Citation(s) in RCA: 43] [Impact Index Per Article: 21.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/21/2021] [Revised: 01/18/2022] [Accepted: 01/21/2022] [Indexed: 05/09/2023]
Abstract
In agriculture, abiotic stress is one of the critical issues impacting the crop productivity and yield. Such stress factors lead to the generation of reactive oxygen species, membrane damage, and other plant metabolic activities. To neutralize the harmful effects of abiotic stress, several strategies have been employed that include the utilization of nanomaterials. Nanomaterials are now gaining attention worldwide to protect plant growth against abiotic stresses such as drought, salinity, heavy metals, extreme temperatures, flooding, etc. However, their behavior is significantly impacted by the dose in which they are being used in agriculture. Furthermore, the action of nanomaterials in plants under various stresses still require understanding. Hence, with this background, the present review envisages to highlight beneficial role of nanomaterials in plants, their mode of action, and their mechanism in overcoming various abiotic stresses. It also emphasizes upon antioxidant activities of different nanomaterials and their dose-dependent variability in plants' growth under stress. Nevertheless, limitations of using nanomaterials in agriculture are also presented in this review.
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Affiliation(s)
- Mohammad Sarraf
- Department of Horticulture Science, Shiraz Branch, Islamic Azad University, Shiraz 71987-74731, Iran;
| | - Kanchan Vishwakarma
- Amity Institute of Microbial Technology, Amity University Uttar Pradesh, Noida 201313, India;
| | - Vinod Kumar
- Department of Botany, Government Degree College, Ramban 182144, India;
| | - Namira Arif
- D. D. Pant Interdisciplinary Research Laboratory, Department of Botany, University of Allahabad, Prayagraj 211002, India; (N.A.); (D.K.C.)
| | - Susmita Das
- Plant Physiology and Biochemistry Laboratory, Department of Botany, University of Calcutta, Kolkata 700019, India;
| | - Riya Johnson
- Plant Physiology and Biochemistry Division, Department of Botany, University of Calicut, C.U. Campus P.O., Kozhikode 673635, India; (R.J.); (E.J.); (J.T.P.)
| | - Edappayil Janeeshma
- Plant Physiology and Biochemistry Division, Department of Botany, University of Calicut, C.U. Campus P.O., Kozhikode 673635, India; (R.J.); (E.J.); (J.T.P.)
| | - Jos T. Puthur
- Plant Physiology and Biochemistry Division, Department of Botany, University of Calicut, C.U. Campus P.O., Kozhikode 673635, India; (R.J.); (E.J.); (J.T.P.)
| | - Sasan Aliniaeifard
- Photosynthesis Laboratory, Department of Horticulture, Aburaihan Campus, University of Tehran, Tehran 33916-53755, Iran;
| | - Devendra Kumar Chauhan
- D. D. Pant Interdisciplinary Research Laboratory, Department of Botany, University of Allahabad, Prayagraj 211002, India; (N.A.); (D.K.C.)
| | - Masayuki Fujita
- Laboratory of Plant Stress Responses, Faculty of Agriculture, Kagawa University, Miki-cho, Kita-gun, Kagawa 761-0795, Japan
| | - Mirza Hasanuzzaman
- Department of Agronomy, Faculty of Agriculture, Sher-e-Bangla Agricultural University, Dhaka 1207, Bangladesh
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16
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Brunetti SC, Arseneault MKM, Wright JA, Wang Z, Ehdaeivand MR, Lowden MJ, Rivoal J, Khalil HB, Garg G, Gulick PJ. The stress induced caleosin, RD20/CLO3, acts as a negative regulator of GPA1 in Arabidopsis. PLANT MOLECULAR BIOLOGY 2021; 107:159-175. [PMID: 34599731 DOI: 10.1007/s11103-021-01189-x] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/25/2021] [Accepted: 09/05/2021] [Indexed: 06/13/2023]
Abstract
KEY MESSAGE A stress induced calcium-binding protein, RD20/CLO3 interacts with the alpha subunit of the heterotrimeric G-protein complex in Arabidopsis and affects etiolation and leaf morphology. Heterotrimeric G proteins and calcium signaling have both been shown to play a role in the response to environmental abiotic stress in plants; however, the interaction between calcium-binding proteins and G-protein signaling molecules remains elusive. We investigated the interaction between the alpha subunit of the heterotrimeric G-protein complex, GPA1, of Arabidopsis thaliana with the calcium-binding protein, the caleosin RD20/CLO3, a gene strongly induced by drought, salt and abscisic acid. The proteins were found to interact in vivo by bimolecular fluorescent complementation (BiFC); the interaction was localized to the endoplasmic reticulum and to oil bodies within the cell. The constitutively GTP-bound GPA1 (GPA1QL) also interacts with RD20/CLO3 as well as its EF-hand mutant variations and these interactions are localized to the plasma membrane. The N-terminal portion of RD20/CLO3 was found to be responsible for the interaction with GPA1 and GPA1QL using both BiFC and yeast two-hybrid assays. RD20/CLO3 contains a single calcium-binding EF-hand in the N-terminal portion of the protein; disruption of the calcium-binding capacity of the protein obliterates interaction with GPA1 in in vivo assays and decreases the interaction between the caleosin and the constitutively active GPA1QL. Analysis of rd20/clo3 mutants shows that RD20/CLO3 plays a key role in the signaling pathway controlling hypocotyl length in dark grown seedlings and in leaf morphology. Our findings indicate a novel role for RD20/CLO3 as a negative regulator of GPA1.
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Affiliation(s)
- Sabrina C Brunetti
- Department of Biology, Concordia University, 7141 Sherbrooke W., Montreal, QC, H4B 1R6, Canada
| | - Michelle K M Arseneault
- Department of Biology, Concordia University, 7141 Sherbrooke W., Montreal, QC, H4B 1R6, Canada
| | - Justin A Wright
- Department of Biology, Concordia University, 7141 Sherbrooke W., Montreal, QC, H4B 1R6, Canada
| | - Zhejun Wang
- Department of Biology, Concordia University, 7141 Sherbrooke W., Montreal, QC, H4B 1R6, Canada
| | | | - Michael J Lowden
- Department of Biology, Concordia University, 7141 Sherbrooke W., Montreal, QC, H4B 1R6, Canada
| | - Jean Rivoal
- Institut de Recherche en Biologie Végétale, Université de Montréal, 4101 Sherbrooke Est, Montréal, QC, H1X 2B2, Canada
| | - Hala B Khalil
- Department of Biology, Concordia University, 7141 Sherbrooke W., Montreal, QC, H4B 1R6, Canada
- Department of Genetics, Faculty of Agriculture, Ain-Shams University, Shoubra El-khema, Cairo, Egypt
| | - Gajra Garg
- Department of Biology, Concordia University, 7141 Sherbrooke W., Montreal, QC, H4B 1R6, Canada
- Department of Biotechnology & Microbiology, Mahatma Jyoti Rao Phoole University, Jaipur, Rajasthan, India
| | - Patrick J Gulick
- Department of Biology, Concordia University, 7141 Sherbrooke W., Montreal, QC, H4B 1R6, Canada.
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17
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Hanano A, Shaban M, Murphy DJ. Functional involvement of caleosin/peroxygenase PdPXG4 in the accumulation of date palm leaf lipid droplets after exposure to dioxins. ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2021; 281:116966. [PMID: 33799204 DOI: 10.1016/j.envpol.2021.116966] [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: 01/17/2021] [Revised: 03/03/2021] [Accepted: 03/15/2021] [Indexed: 06/12/2023]
Abstract
Dioxins are highly injurious environmental pollutants with proven toxicological effects on both animals and humans, but to date their effects on plants still need to be studied in detail. We identified a dioxin-inducible caleosin/peroxygenase isoform, PdPXG4, that is mostly expressed in leaves of date palm seedlings and exhibits a specific reductase activity towards the 13-hydroperoxide of C18:2 and C18:3 (HpODE and HpOTrE, respectively). After exposure to TCDD, lipid droplets (LDs) isolated from TCDD-exposed leaves were about 6.5-15.7-fold more active in metabolizing 13-HpOTrE compared with those isolated from non-exposed leaves. A characteristic spectrum of leaf dioxin-responsive oxylipins (LDROXYL) was detected in dioxin-exposed seedlings. Of particular importance, a group of these oxylipins, referred to as Class I, comprising six congeners of hydroxides fatty acids derived from C18:2 and C18:3, was exclusively found in leaves after exposure to TCDD. The TCDD-induced oxylipin pattern was confirmed in vitro using terbufos, a typical inhibitor towards the PdPXG4 peroxygenase activity. Of particular interest, the response of terbufos-pretreated protoplasts to TCDD was drastically reduced. Together, these findings suggest that PdPXG4 is implicated in the establishment of a dioxin-specific oxylipin signature in date palm leaves soon after their exposure to these pollutants.
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Affiliation(s)
- Abdulsamie Hanano
- Department of Molecular Biology and Biotechnology, Atomic Energy Commission of Syria (AECS), Damascus, Syria.
| | - Mouhnad Shaban
- Department of Molecular Biology and Biotechnology, Atomic Energy Commission of Syria (AECS), Damascus, Syria.
| | - Denis J Murphy
- Genomics and Computational Biology Research Group, University of South Wales, NP7 7ET, United Kingdom.
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18
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Modulation of photosynthesis and other proteins during water-stress. Mol Biol Rep 2021; 48:3681-3693. [PMID: 33856605 DOI: 10.1007/s11033-021-06329-6] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2020] [Accepted: 03/31/2021] [Indexed: 10/25/2022]
Abstract
Protein changes under drought or water stress conditions have been widely investigated. These investigations have given us enormous understanding of how drought is manifested in plants and how plants respond and adopt to such conditions. Chlorophyll fluoroescence, gas exchange, OMICS, biochemical and molecular analyses have shed light on regulation of physiology and photosynthesis of plants under drought. Use of proteomics has greatly increased the repertoire of drought-associated proteins which nevertheless, need to be investigated for their mechanistic and functional roles. Roles of such proteins have been succinctly discussed in various review articles, however more information on their functional role in countering drought is needed. In this review, recent developments in the field, alterations in the abundance of plant proteins in response to drought, monitored through numerous proteomic and immuno-blot analyses, and how these could affect plants growth and development, are discussed.
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19
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Rathor P, Borza T, Stone S, Tonon T, Yurgel S, Potin P, Prithiviraj B. A Novel Protein from Ectocarpus sp. Improves Salinity and High Temperature Stress Tolerance in Arabidopsis thaliana. Int J Mol Sci 2021; 22:1971. [PMID: 33671243 PMCID: PMC7922944 DOI: 10.3390/ijms22041971] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2021] [Revised: 02/11/2021] [Accepted: 02/13/2021] [Indexed: 11/16/2022] Open
Abstract
Brown alga Ectocarpus sp. belongs to Phaeophyceae, a class of macroalgae that evolved complex multicellularity. Ectocarpus sp. is a dominant seaweed in temperate regions, abundant mostly in the intertidal zones, an environment with high levels of abiotic stresses. Previous transcriptomic analysis of Ectocarpus sp. revealed several genes consistently induced by various abiotic stresses; one of these genes is Esi0017_0056, which encodes a protein with unknown function. Bioinformatics analyses indicated that the protein encoded by Esi0017_0056 is soluble and monomeric. The protein was successfully expressed in Escherichia coli,Arabidopsis thaliana and Nicotiana benthamiana. In A. thaliana the gene was expressed under constitutive and stress inducible promoters which led to improved tolerance to high salinity and temperature stresses. The expression of several key abiotic stress-related genes was studied in transgenic and wild type A. thaliana by qPCR. Expression analysis revealed that genes involved in ABA-induced abiotic stress tolerance, K+ homeostasis, and chaperon activities were significantly up-regulated in the transgenic line. This study is the first report in which an unknown function Ectocarpus sp. gene, highly responsive to abiotic stresses, was successfully expressed in A. thaliana, leading to improved tolerance to salt and temperature stress.
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Affiliation(s)
- Pramod Rathor
- Department of Plant, Food and Environmental Sciences, Dalhousie University, Truro, NS B2N 5E3, Canada; (P.R.); (T.B.); (S.Y.)
| | - Tudor Borza
- Department of Plant, Food and Environmental Sciences, Dalhousie University, Truro, NS B2N 5E3, Canada; (P.R.); (T.B.); (S.Y.)
| | - Sophia Stone
- Department of Biology, Dalhousie University, Halifax, NS B3H 4R2, Canada;
| | - Thierry Tonon
- Centre for Novel Agricultural Products, Department of Biology, University of York, Heslington, York YO10 5DD, UK;
- Integrative Biology of Marine Models (LBI2M), Station Biologique de Roscoff (SBR), Sorbonne Université, CNRS, UMR 8227, 29680 Roscoff, France;
| | - Svetlana Yurgel
- Department of Plant, Food and Environmental Sciences, Dalhousie University, Truro, NS B2N 5E3, Canada; (P.R.); (T.B.); (S.Y.)
| | - Philippe Potin
- Integrative Biology of Marine Models (LBI2M), Station Biologique de Roscoff (SBR), Sorbonne Université, CNRS, UMR 8227, 29680 Roscoff, France;
| | - Balakrishnan Prithiviraj
- Department of Plant, Food and Environmental Sciences, Dalhousie University, Truro, NS B2N 5E3, Canada; (P.R.); (T.B.); (S.Y.)
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20
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Jing P, Kong D, Ji L, Kong L, Wang Y, Peng L, Xie G. OsClo5 functions as a transcriptional co-repressor by interacting with OsDi19-5 to negatively affect salt stress tolerance in rice seedlings. THE PLANT JOURNAL : FOR CELL AND MOLECULAR BIOLOGY 2021; 105:800-815. [PMID: 33179343 DOI: 10.1111/tpj.15074] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/29/2020] [Revised: 09/28/2020] [Accepted: 10/13/2020] [Indexed: 06/11/2023]
Abstract
Caleosins constitute a small protein family with one calcium-binding EF-hand motif. They are involved in the regulation of development and response to abiotic stress in plants. Nevertheless, how they impact salt stress tolerance in rice is largely unknown. Thereby, biochemical and molecular genetic experiments were carried out, and the results revealed that OsClo5 was able to bind calcium and phospholipids in vitro and localized in the nucleus and endoplasmic reticulum in rice protoplasts. At the germination and early seedlings stages, overexpression transgenic lines and T-DNA mutant lines exhibited reduced and increased tolerance to salt stress, respectively, compared with the wild-type. Yeast two-hybrid, bimolecular fluorescence complementation and in vitro pull-down assays demonstrated that the EF-hand motif of OsClo5 was essential for the interactions with itself and OsDi19-5. Yeast one-hybrid, electrophoretic migration shift and dual-luciferase reporter assays identified OsDi19-5 as a transcriptional repressor via the TACART cis-element in the promoters of two salt stress-related target genes, OsUSP and OsMST. In addition, OsClo5 enhanced the inhibitory effect of OsDi19-5 in the tobacco transient system, which was confirmed by qRT-PCR analysis in rice seedlings under salt stress. The collective results deepen the understanding of the molecular mechanism underlying the roles of caleosin in the salt stress response. These findings will also inform efforts to improve salt tolerance of rice.
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Affiliation(s)
- Pei Jing
- MOA Key Laboratory of Crop Ecophysiology & Farming System in the Middle Reaches of the Yangtze River, College of Plant Science & Technology, Huazhong Agricultural University, Wuhan, 430070, China
- Biomass & Bioenergy Research Centre, College of Plant Science & Technology, Huazhong Agricultural University, Wuhan, 430070, China
| | - Dongyan Kong
- MOA Key Laboratory of Crop Ecophysiology & Farming System in the Middle Reaches of the Yangtze River, College of Plant Science & Technology, Huazhong Agricultural University, Wuhan, 430070, China
| | - Lingxiao Ji
- MOA Key Laboratory of Crop Ecophysiology & Farming System in the Middle Reaches of the Yangtze River, College of Plant Science & Technology, Huazhong Agricultural University, Wuhan, 430070, China
| | - Lin Kong
- MOA Key Laboratory of Crop Ecophysiology & Farming System in the Middle Reaches of the Yangtze River, College of Plant Science & Technology, Huazhong Agricultural University, Wuhan, 430070, China
| | - Yanting Wang
- Biomass & Bioenergy Research Centre, College of Plant Science & Technology, Huazhong Agricultural University, Wuhan, 430070, China
| | - Liangcai Peng
- Biomass & Bioenergy Research Centre, College of Plant Science & Technology, Huazhong Agricultural University, Wuhan, 430070, China
| | - Guosheng Xie
- MOA Key Laboratory of Crop Ecophysiology & Farming System in the Middle Reaches of the Yangtze River, College of Plant Science & Technology, Huazhong Agricultural University, Wuhan, 430070, China
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21
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Fu X, Yang Y, Kang M, Wei H, Lian B, Wang B, Ma L, Hao P, Lu J, Yu S, Wang H. Evolution and Stress Responses of CLO Genes and Potential Function of the GhCLO06 Gene in Salt Resistance of Cotton. FRONTIERS IN PLANT SCIENCE 2021; 12:801239. [PMID: 35111180 PMCID: PMC8802827 DOI: 10.3389/fpls.2021.801239] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/25/2021] [Accepted: 12/23/2021] [Indexed: 05/17/2023]
Abstract
The caleosin (CLO) protein family displays calcium-binding properties and plays an important role in the abiotic stress response. Here, a total of 107 CLO genes were identified in 15 plant species, while no CLO genes were detected in two green algal species. Evolutionary analysis revealed that the CLO gene family may have evolved mainly in terrestrial plants and that biological functional differentiation between species and functional expansion within species have occurred. Of these, 56 CLO genes were identified in four cotton species. Collinearity analysis showed that CLO gene family expansion mainly occurred through segmental duplication and whole-genome duplication in cotton. Sequence alignment and phylogenetic analysis showed that the CLO proteins of the four cotton species were mainly divided into two types: H-caleosins (class I) and L-caleosins (class II). Cis-acting element analysis and quantitative RT-PCR (qRT-PCR) suggested that GhCLOs might be regulated by abscisic acid (ABA) and methyl jasmonate (MeJA). Moreover, transcriptome data and qRT-PCR results revealed that GhCLO genes responded to salt and drought stresses. Under salt stress, gene-silenced plants (TRV: GhCLO06) showed obvious yellowing and wilting, higher malondialdehyde (MDA) content accumulation, and significantly lower activities of superoxide dismutase (SOD) and peroxidase (POD), indicating that GhCLO06 plays a positive regulatory role in cotton salt tolerance. In gene-silenced plants (TRV: GhCLO06), ABA-related genes (GhABF2, GhABI5, and GhNAC4) were significantly upregulated after salt stress, suggesting that the regulation of salt tolerance may be related to the ABA signaling pathway. This research provides an important reference for further understanding and analyzing the molecular regulatory mechanism of CLOs for salt tolerance.
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Affiliation(s)
- Xiaokang Fu
- State Key Laboratory of Cotton Biology, Institute of Cotton Research, Chinese Academy of Agricultural Sciences (CAAS), Anyang, China
| | - Yonglin Yang
- Shihezi Academy of Agricultural Sciences, Shihezi, China
| | - Meng Kang
- State Key Laboratory of Cotton Biology, Institute of Cotton Research, Chinese Academy of Agricultural Sciences (CAAS), Anyang, China
| | - Hengling Wei
- State Key Laboratory of Cotton Biology, Institute of Cotton Research, Chinese Academy of Agricultural Sciences (CAAS), Anyang, China
| | - Boying Lian
- State Key Laboratory of Cotton Biology, Institute of Cotton Research, Chinese Academy of Agricultural Sciences (CAAS), Anyang, China
| | - Baoquan Wang
- State Key Laboratory of Cotton Biology, Institute of Cotton Research, Chinese Academy of Agricultural Sciences (CAAS), Anyang, China
| | - Liang Ma
- State Key Laboratory of Cotton Biology, Institute of Cotton Research, Chinese Academy of Agricultural Sciences (CAAS), Anyang, China
| | - Pengbo Hao
- State Key Laboratory of Cotton Biology, Institute of Cotton Research, Chinese Academy of Agricultural Sciences (CAAS), Anyang, China
| | - Jianhua Lu
- State Key Laboratory of Cotton Biology, Institute of Cotton Research, Chinese Academy of Agricultural Sciences (CAAS), Anyang, China
| | - Shuxun Yu
- State Key Laboratory of Cotton Biology, Institute of Cotton Research, Chinese Academy of Agricultural Sciences (CAAS), Anyang, China
- *Correspondence: Shuxun Yu,
| | - Hantao Wang
- State Key Laboratory of Cotton Biology, Institute of Cotton Research, Chinese Academy of Agricultural Sciences (CAAS), Anyang, China
- Hantao Wang,
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22
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Chang YN, Zhu C, Jiang J, Zhang H, Zhu JK, Duan CG. Epigenetic regulation in plant abiotic stress responses. JOURNAL OF INTEGRATIVE PLANT BIOLOGY 2020; 62:563-580. [PMID: 31872527 DOI: 10.1111/jipb.12901] [Citation(s) in RCA: 226] [Impact Index Per Article: 56.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/19/2019] [Accepted: 02/20/2020] [Indexed: 05/18/2023]
Abstract
In eukaryotic cells, gene expression is greatly influenced by the dynamic chromatin environment. Epigenetic mechanisms, including covalent modifications to DNA and histone tails and the accessibility of chromatin, create various chromatin states for stress-responsive gene expression that is important for adaptation to harsh environmental conditions. Recent studies have revealed that many epigenetic factors participate in abiotic stress responses, and various chromatin modifications are changed when plants are exposed to stressful environments. In this review, we summarize recent progress on the cross-talk between abiotic stress response pathways and epigenetic regulatory pathways in plants. Our review focuses on epigenetic regulation of plant responses to extreme temperatures, drought, salinity, the stress hormone abscisic acid, nutrient limitations and ultraviolet stress, and on epigenetic mechanisms of stress memory.
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Affiliation(s)
- Ya-Nan Chang
- Shanghai Center for Plant Stress Biology and Center of Excellence in Molecular Plant Sciences, Chinese Academy of Sciences, Shanghai, 201602, China
- University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Chen Zhu
- Shanghai Center for Plant Stress Biology and Center of Excellence in Molecular Plant Sciences, Chinese Academy of Sciences, Shanghai, 201602, China
| | - Jing Jiang
- State Key Laboratory of Crop Stress Adaptation and Improvement, School of Life Sciences, Henan University, Kaifeng, 475004, China
| | - Huiming Zhang
- Shanghai Center for Plant Stress Biology and Center of Excellence in Molecular Plant Sciences, Chinese Academy of Sciences, Shanghai, 201602, China
- State Key Laboratory of Crop Stress Adaptation and Improvement, School of Life Sciences, Henan University, Kaifeng, 475004, China
| | - Jian-Kang Zhu
- Shanghai Center for Plant Stress Biology and Center of Excellence in Molecular Plant Sciences, Chinese Academy of Sciences, Shanghai, 201602, China
- Department of Horticulture and Landscape Architecture, Purdue University, West Lafayette, IN, 47907, USA
| | - Cheng-Guo Duan
- Shanghai Center for Plant Stress Biology and Center of Excellence in Molecular Plant Sciences, Chinese Academy of Sciences, Shanghai, 201602, China
- State Key Laboratory of Crop Stress Adaptation and Improvement, School of Life Sciences, Henan University, Kaifeng, 475004, China
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23
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Sun X, Zhu J, Li X, Li Z, Han L, Luo H. AsHSP26.8a, a creeping bentgrass small heat shock protein integrates different signaling pathways to modulate plant abiotic stress response. BMC PLANT BIOLOGY 2020; 20:184. [PMID: 32345221 PMCID: PMC7189581 DOI: 10.1186/s12870-020-02369-5] [Citation(s) in RCA: 21] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/30/2019] [Accepted: 03/29/2020] [Indexed: 05/24/2023]
Abstract
BACKGROUND Small heat shock proteins (sHSPs) are critical for plant response to biotic and abiotic stresses, especially heat stress. They have also been implicated in various aspects of plant development. However, the acting mechanisms of the sHSPs in plants, especially in perennial grass species, remain largely elusive. RESULTS In this study, AsHSP26.8a, a novel chloroplast-localized sHSP gene from creeping bentgrass (Agrostis stolonifera L.) was cloned and its role in plant response to environmental stress was studied. AsHSP26.8a encodes a protein of 26.8 kDa. Its expression was strongly induced in both leaf and root tissues by heat stress. Transgenic Arabidopsis plants overexpressing AsHSP26.8a displayed reduced tolerance to heat stress. Furthermore, overexpression of AsHSP26.8a resulted in hypersensitivity to hormone ABA and salinity stress. Global gene expression analysis revealed AsHSP26.8a-modulated expression of heat-shock transcription factor gene, and the involvement of AsHSP26.8a in ABA-dependent and -independent as well as other stress signaling pathways. CONCLUSIONS Our results suggest that AsHSP26.8a may negatively regulate plant response to various abiotic stresses through modulating ABA and other stress signaling pathways.
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Affiliation(s)
- Xinbo Sun
- Key Laboratory of Crop Growth Regulation of Hebei Province, College of Agronomy, Hebei Agricultural University, Baoding, Hebei, 071001, People's Republic of China
- Department of Genetics and Biochemistry, Clemson University, 110 Biosystems Research Complex, Clemson, SC, 29634, USA
| | - Junfei Zhu
- Key Laboratory of Crop Growth Regulation of Hebei Province, College of Agronomy, Hebei Agricultural University, Baoding, Hebei, 071001, People's Republic of China
| | - Xin Li
- Key Laboratory of Crop Growth Regulation of Hebei Province, College of Agronomy, Hebei Agricultural University, Baoding, Hebei, 071001, People's Republic of China
| | - Zhigang Li
- Department of Genetics and Biochemistry, Clemson University, 110 Biosystems Research Complex, Clemson, SC, 29634, USA
| | - Liebao Han
- Turfgrass Research Institute, Beijing Forestry University, Beijing, 100083, People's Republic of China.
| | - Hong Luo
- Department of Genetics and Biochemistry, Clemson University, 110 Biosystems Research Complex, Clemson, SC, 29634, USA.
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24
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Wei M, Zhuang Y, Li H, Li P, Huo H, Shu D, Huang W, Wang S. The cloning and characterization of hypersensitive to salt stress mutant, affected in quinolinate synthase, highlights the involvement of NAD in stress-induced accumulation of ABA and proline. THE PLANT JOURNAL : FOR CELL AND MOLECULAR BIOLOGY 2020; 102:85-98. [PMID: 31733117 DOI: 10.1111/tpj.14613] [Citation(s) in RCA: 24] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/25/2019] [Revised: 10/28/2019] [Accepted: 11/01/2019] [Indexed: 05/22/2023]
Abstract
Nicotinamide adenine dinucleotide (NAD), a ubiquitous coenzyme, is required for many physiological reactions and processes. However, it remains largely unknown how NAD affects plant response to salt stress. We isolated a salt-sensitive mutant named hypersensitive to salt stress (hss) from an ethyl methanesulfonate-induced mutation population. A point mutation was identified by MutMap in the encoding region of Quinolinate Synthase (QS) gene required for the de novo synthesis of NAD. This point mutation caused a substitution of amino acid in the highly-conserved NadA domain of QS, resulting in an impairment of NAD biosynthesis in the mutant. Molecular and chemical complementation have restored the response of the hss mutant to salt stress, indicating that the decreased NAD contents in the mutant were responsible for its hypersensitivity to salt stress. Furthermore, the endogenous levels of abscisic acid (ABA) and proline were also reduced in stress-treated hss mutant. The application of ABA or proline could alleviate stress-induced oxidative damage of the mutant and partially rescue its hypersensitivity to salt stress, but not affect NAD concentration. Taken together, our results demonstrated that the NadA domain of QS is important for NAD biosynthesis, and NAD participates in plant response to salt stress by affecting stress-induced accumulation of ABA and proline.
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Affiliation(s)
- Ming Wei
- CAS Center for Excellence in Molecular Plant Sciences, Chengdu Institute of Biology, Chinese Academy of Sciences, Chengdu, 610041, China
- University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Yong Zhuang
- CAS Center for Excellence in Molecular Plant Sciences, Chengdu Institute of Biology, Chinese Academy of Sciences, Chengdu, 610041, China
- University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Hui Li
- CAS Center for Excellence in Molecular Plant Sciences, Chengdu Institute of Biology, Chinese Academy of Sciences, Chengdu, 610041, China
| | - Penghui Li
- CAS Center for Excellence in Molecular Plant Sciences, Chengdu Institute of Biology, Chinese Academy of Sciences, Chengdu, 610041, China
- University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Heqiang Huo
- Mid-Florida Research and Education Center, Institute of Food and Agricultural Sciences, University of Florida, Apopka, FL, 32703, USA
| | - Dan Shu
- CAS Center for Excellence in Molecular Plant Sciences, Chengdu Institute of Biology, Chinese Academy of Sciences, Chengdu, 610041, China
| | - Weizao Huang
- CAS Center for Excellence in Molecular Plant Sciences, Chengdu Institute of Biology, Chinese Academy of Sciences, Chengdu, 610041, China
| | - Songhu Wang
- CAS Center for Excellence in Molecular Plant Sciences, Chengdu Institute of Biology, Chinese Academy of Sciences, Chengdu, 610041, China
- University of Chinese Academy of Sciences, Beijing, 100049, China
- Southeast Asia Biodiversity Research Institute, Chinese Academy of Sciences, Yezin, Nay Pyi Taw, 05282, Myanmar
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25
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Tartary Buckwheat Transcription Factor FtbZIP5, Regulated by FtSnRK2.6, Can Improve Salt/Drought Resistance in Transgenic Arabidopsis. Int J Mol Sci 2020; 21:ijms21031123. [PMID: 32046219 PMCID: PMC7037857 DOI: 10.3390/ijms21031123] [Citation(s) in RCA: 25] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2019] [Revised: 02/04/2020] [Accepted: 02/05/2020] [Indexed: 01/23/2023] Open
Abstract
bZIP transcription factors have been reported to be involved in many different biological processes in plants. The ABA (abscisic acid)-dependent AREB/ABF-SnRK2 pathway has been shown to play a key role in the response to osmotic stress in model plants. In this study, a novel bZIP gene, FtbZIP5, was isolated from tartary buckwheat, and its role in the response to drought and salt stress was characterized by transgenic Arabidopsis. We found that FtbZIP5 has transcriptional activation activity, which is located in the nucleus and specifically binds to ABRE elements. It can be induced by exposure to PEG6000, salt and ABA in tartary buckwheat. The ectopic expression of FtbZIP5 reduced the sensitivity of transgenic plants to drought and high salt levels and reduced the oxidative damage in plants by regulating the antioxidant system at a physiological level. In addition, we found that, under drought and salt stress, the expression levels of several ABA-dependent stress response genes (RD29A, RD29B, RAB18, RD26, RD20 and COR15) in the transgenic plants increased significantly compared with their expression levels in the wild type plants. Ectopic expression of FtbZIP5 in Arabidopsis can partially complement the function of the ABA-insensitive mutant abi5-1 (abscisic acid-insensitive 5-1). Moreover, we screened FtSnRK2.6, which might phosphorylate FtbZIP5, in a yeast two-hybrid experiment. Taken together, these results suggest that FtbZIP5, as a positive regulator, mediates plant tolerance to salt and drought through ABA-dependent signaling pathways.
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26
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Tian L, Zhang Y, Kang E, Ma H, Zhao H, Yuan M, Zhu L, Fu Y. Basic-leucine zipper 17 and Hmg-CoA reductase degradation 3A are involved in salt acclimation memory in Arabidopsis. JOURNAL OF INTEGRATIVE PLANT BIOLOGY 2019; 61:1062-1084. [PMID: 30450762 DOI: 10.1111/jipb.12744] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/29/2018] [Accepted: 11/12/2018] [Indexed: 05/18/2023]
Abstract
Salt acclimation, which is induced by previous salt exposure, increases the resistance of plants to future exposure to salt stress. However, little is known about the underlying mechanism, particularly how plants store the "memory" of salt exposure. In this study, we established a system to study salt acclimation in Arabidopsis thaliana. Following treatment with a low concentration of salt, seedlings were allowed to recover to allow transitory salt responses to subside while maintaining the sustainable effects of salt acclimation. We performed transcriptome profiling analysis of these seedlings to identify genes related to salt acclimation memory. Notably, the expression of Basic-leucine zipper 17 (bZIP17) and Hmg-CoA reductase degradation 3A (HRD3A), which are important in the unfolded protein response (UPR) and endoplasmic reticulum-associated degradation (ERAD), respectively, increased following treatment with a low concentration of salt and remained at stably high levels after the stimulus was removed, a treatment which improved plant tolerance to future high-salinity challenge. Our findings suggest that the upregulated expression of important genes involved in the UPR and ERAD represents a "memory" of the history of salt exposure and enables more potent responses to future exposure to salt stress, providing new insights into the mechanisms underlying salt acclimation in plants.
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Affiliation(s)
- Lin Tian
- College of Biological Sciences, China Agricultural University, Beijing 100193, China
| | - Yan Zhang
- College of Biological Sciences, China Agricultural University, Beijing 100193, China
| | - Erfang Kang
- College of Biological Sciences, China Agricultural University, Beijing 100193, China
| | - Huifang Ma
- College of Biological Sciences, China Agricultural University, Beijing 100193, China
| | - Huan Zhao
- College of Biological Sciences, China Agricultural University, Beijing 100193, China
| | - Ming Yuan
- College of Biological Sciences, China Agricultural University, Beijing 100193, China
| | - Lei Zhu
- College of Biological Sciences, China Agricultural University, Beijing 100193, China
| | - Ying Fu
- College of Biological Sciences, China Agricultural University, Beijing 100193, China
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27
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Identification of a dioxin-responsive oxylipin signature in roots of date palm: involvement of a 9-hydroperoxide fatty acid reductase, caleosin/peroxygenase PdPXG2. Sci Rep 2018; 8:13181. [PMID: 30181584 PMCID: PMC6123484 DOI: 10.1038/s41598-018-31342-4] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2017] [Accepted: 07/17/2018] [Indexed: 01/02/2023] Open
Abstract
Dioxins are highly hazardous pollutants that have well characterized impacts on both animal and human health. However, the biological effects of dioxins on plants have yet to be described in detail. Here we describe a dioxin-inducible caleosin/peroxygenase isoform, PdPXG2, that is mainly expressed in the apical zone of date palm roots and specifically reduces 9-hydroperoxide fatty acids. A characteristic spectrum of 18 dioxin-responsive oxylipin (DROXYL) congeners was also detected in date palm roots after exposure to dioxin. Of particular interest, six oxylipins, mostly hydroxy fatty acids, were exclusively formed in response to TCDD. The DROXYL signature was evaluated in planta and validated in vitro using a specific inhibitor of PdPXG2 in a root-protoplast system. Comparative analysis of root suberin showed that levels of certain monomers, especially the mono-epoxides and tri-hydroxides of C16:3 and C18:3, were significantly increased after exposure to TCDD. Specific inhibition of PdPXG2 activity revealed a positive linear relationship between deposition of suberin in roots and their permeability to TCDD. The results highlight the involvement of this peroxygenase in the plant response to dioxin and suggest the use of dioxin-responsive oxylipin signatures as biomarkers for plant exposure to this important class of xenobiotic contaminants.
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28
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Irani S, Todd CD. Exogenous allantoin increases Arabidopsis seedlings tolerance to NaCl stress and regulates expression of oxidative stress response genes. JOURNAL OF PLANT PHYSIOLOGY 2018; 221:43-50. [PMID: 29245127 DOI: 10.1016/j.jplph.2017.11.011] [Citation(s) in RCA: 34] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/20/2017] [Revised: 11/22/2017] [Accepted: 11/24/2017] [Indexed: 05/21/2023]
Abstract
Allantoin is a nitrogenous compound derived from purine catabolism that contributes to nitrogen recycling in plants. Accumulation of allantoin in plant tissues and a potential role in protection of plants from abiotic stress conditions has been identified. The present work shows that application of exogenous allantoin increased stress tolerance of Arabidopsis seedlings when germinated on, or subjected to the media containing NaCl. Allantoin-induced tolerance to NaCl stress was associated with decreased production of superoxide and hydrogen peroxide in seedlings. To understand the molecular mechanism, the effect of exogenous allantoin treatment on expression of several stress-related genes was investigated. Exogenous allantoin altered the expression of several antioxidant encoding genes and upregulated the expression of two genes involved in oxidative stress tolerance, SOS1 and RCD1, in the presence or absence of NaCl. Allantoin increased the NaCl tolerance of abscisic acid insensitive mutants, suggesting that it can function independently of abscisic acid signaling. These results provide additional evidence for the role of allantoin in enhancing plants tolerance to oxidative stress.
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Affiliation(s)
- Solmaz Irani
- University of Saskatchewan, Department of Biology, 112 Science Place, Saskatoon, SK, S7N5E2, Canada
| | - Christopher D Todd
- University of Saskatchewan, Department of Biology, 112 Science Place, Saskatoon, SK, S7N5E2, Canada.
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29
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Hanano A, Almousally I, Shaban M, Rahman F, Hassan M, Murphy DJ. Specific Caleosin/Peroxygenase and Lipoxygenase Activities Are Tissue-Differentially Expressed in Date Palm ( Phoenix dactylifera L.) Seedlings and Are Further Induced Following Exposure to the Toxin 2,3,7,8-tetrachlorodibenzo-p-dioxin. FRONTIERS IN PLANT SCIENCE 2017; 7:2025. [PMID: 28111588 PMCID: PMC5216026 DOI: 10.3389/fpls.2016.02025] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/20/2016] [Accepted: 12/19/2016] [Indexed: 06/02/2023]
Abstract
Two caleosin/peroxygenase isoforms from date palm, Phoenix dactylifera L., PdCLO2 and PdCLO4, were characterized with respect to their tissue expression, subcellular localization, and oxylipin pathway substrate specificities in developing seedlings. Both PdCLO2 and PdCLO4 had peroxygenase activities that peaked at the mid-stage (radicle length of 2.5 cm) of seedling growth and were associated with the lipid droplet (LD) and microsomal fractions. Recombinant PdCLO2 and PdCLO4 proteins heterologously expressed in yeast cells were localized in both LD and microsomal fractions. Each of the purified recombinant proteins exhibited peroxygenase activity but they were catalytically distinct with respect to their specificity and product formation from fatty acid epoxide and hydroxide substrates. We recently showed that date palm CLO genes were upregulated following exposure to the potent toxin, 2,3,7,8-tetrachlorodibenzo-p-dioxin (TCDD) (Hanano et al., 2016), and we show here that transcripts of 9- and 13-lipoxygenase (LOX) genes were also induced by TCDD exposure. At the enzyme level, 9-LOX and 13-LOX activities were present in a range of seedling tissues and responded differently to TCDD exposure, as did the 9- and 13-fatty acid hydroperoxide reductase activities. This demonstrates that at least two branches of the oxylipin pathway are involved in responses to the environmental organic toxin, TCDD in date palm.
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Affiliation(s)
- Abdulsamie Hanano
- Department of Molecular Biology and Biotechnology, Atomic Energy Commission of SyriaDamascus, Syria
| | - Ibrahem Almousally
- Department of Molecular Biology and Biotechnology, Atomic Energy Commission of SyriaDamascus, Syria
| | - Mouhnad Shaban
- Department of Molecular Biology and Biotechnology, Atomic Energy Commission of SyriaDamascus, Syria
| | - Farzana Rahman
- Genomics and Computational Biology Group, University of South WalesWales, UK
| | - Mehedi Hassan
- Genomics and Computational Biology Group, University of South WalesWales, UK
| | - Denis J. Murphy
- Genomics and Computational Biology Group, University of South WalesWales, UK
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30
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Jing P, Zou J, Kong L, Hu S, Wang B, Yang J, Xie G. OsCCD1, a novel small calcium-binding protein with one EF-hand motif, positively regulates osmotic and salt tolerance in rice. PLANT SCIENCE : AN INTERNATIONAL JOURNAL OF EXPERIMENTAL PLANT BIOLOGY 2016; 247:104-14. [PMID: 27095404 DOI: 10.1016/j.plantsci.2016.03.011] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/25/2015] [Revised: 03/16/2016] [Accepted: 03/19/2016] [Indexed: 05/20/2023]
Abstract
Calcium-binding proteins play key roles in the signal transduction in the growth and stress response in eukaryotes. However, a subfamily of proteins with one EF-hand motif has not been fully studied in higher plants. Here, a novel small calcium-binding protein with a C-terminal centrin-like domain (CCD1) in rice, OsCCD1, was characterized to show high similarity with a TaCCD1 in wheat. As a result, OsCCD1 can bind Ca(2+) in the in vitro EMSA and the fluorescence staining calcium-binding assays. Transient expression of green fluorescent protein (GFP)-tagged OsCCD1 in rice protoplasts showed that OsCCD1 was localized in the nucleus and cytosol of rice cells. OsCCD1 transcript levels were transiently induced by osmotic stress and salt stress through the calcium-mediated ABA signal. The rice seedlings of T-DNA mutant lines showed significantly less tolerance to osmotic and salt stresses than wild type plants (p<0.01). Conversely, its overexpressors can significantly enhance the tolerance to osmotic and salt stresses than wild type plants (p<0.05). Semi-quantitative RT-PCR analysis revealed that, OsDREB2B, OsAPX1 and OsP5CS genes are involved in the rice tolerance to osmotic and salt stresses. In sum, OsCCD1 gene probably affects the DREB2B and its downstream genes to positively regulate osmotic and salt tolerance in rice seedlings.
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Affiliation(s)
- Pei Jing
- MOA Key Laboratory of Crop Ecophysiology and Farming System in the Middle Reaches of the Yangtze River, College of Plant Science and Technology, Huazhong Agricultural University, Wuhan 430070, PR China
| | - Juanzi Zou
- MOA Key Laboratory of Crop Ecophysiology and Farming System in the Middle Reaches of the Yangtze River, College of Plant Science and Technology, Huazhong Agricultural University, Wuhan 430070, PR China
| | - Lin Kong
- MOA Key Laboratory of Crop Ecophysiology and Farming System in the Middle Reaches of the Yangtze River, College of Plant Science and Technology, Huazhong Agricultural University, Wuhan 430070, PR China
| | - Shiqi Hu
- MOA Key Laboratory of Crop Ecophysiology and Farming System in the Middle Reaches of the Yangtze River, College of Plant Science and Technology, Huazhong Agricultural University, Wuhan 430070, PR China
| | - Biying Wang
- MOA Key Laboratory of Crop Ecophysiology and Farming System in the Middle Reaches of the Yangtze River, College of Plant Science and Technology, Huazhong Agricultural University, Wuhan 430070, PR China
| | - Jun Yang
- MOA Key Laboratory of Crop Ecophysiology and Farming System in the Middle Reaches of the Yangtze River, College of Plant Science and Technology, Huazhong Agricultural University, Wuhan 430070, PR China
| | - Guosheng Xie
- MOA Key Laboratory of Crop Ecophysiology and Farming System in the Middle Reaches of the Yangtze River, College of Plant Science and Technology, Huazhong Agricultural University, Wuhan 430070, PR China.
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31
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Hillwig MS, Chiozza M, Casteel CL, Lau ST, Hohenstein J, Hernández E, Jander G, MacIntosh GC. Abscisic acid deficiency increases defence responses against Myzus persicae in Arabidopsis. MOLECULAR PLANT PATHOLOGY 2016; 17:225-35. [PMID: 25943308 PMCID: PMC6638517 DOI: 10.1111/mpp.12274] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/04/2023]
Abstract
Comparison of Arabidopsis thaliana (Arabidopsis) gene expression induced by Myzus persicae (green peach aphid) feeding, aphid saliva infiltration and abscisic acid (ABA) treatment showed a significant positive correlation. In particular, ABA-regulated genes are over-represented among genes that are induced by M. persicae saliva infiltration into Arabidopsis leaves. This suggests that the induction of ABA-related gene expression could be an important component of the Arabidopsis-aphid interaction. Consistent with this hypothesis, M. persicae populations induced ABA production in wild-type plants. Furthermore, aphid populations were smaller on Arabidopsis aba1-1 mutants, which cannot synthesize ABA, and showed a significant preference for wild-type plants compared with the mutant. Total free amino acids, which play an important role in aphid nutrition, were not altered in the aba1-1 mutant line, but the levels of isoleucine (Ile) and tryptophan (Trp) were differentially affected by aphids in wild-type and mutant plants. Recently, indole glucosinolates have been shown to promote aphid resistance in Arabidopsis. In this study, 4-methoxyindol-3-ylmethylglucosinolate was more abundant in the aba1-1 mutant than in wild-type Arabidopsis, suggesting that the induction of ABA signals that decrease the accumulation of defence compounds may be beneficial for aphids.
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Affiliation(s)
- Melissa S Hillwig
- Department of Biochemistry, Biophysics and Molecular Biology, Iowa State University, Ames, IA, 50011, USA
| | - Mariana Chiozza
- Department of Biochemistry, Biophysics and Molecular Biology, Iowa State University, Ames, IA, 50011, USA
| | - Clare L Casteel
- Boyce Thompson Institute for Plant Research, Ithaca, NY, 14853, USA
| | - Siau Ting Lau
- Department of Biochemistry, Biophysics and Molecular Biology, Iowa State University, Ames, IA, 50011, USA
| | - Jessica Hohenstein
- Department of Biochemistry, Biophysics and Molecular Biology, Iowa State University, Ames, IA, 50011, USA
| | - Enrique Hernández
- Department of Biochemistry, Biophysics and Molecular Biology, Iowa State University, Ames, IA, 50011, USA
| | - Georg Jander
- Boyce Thompson Institute for Plant Research, Ithaca, NY, 14853, USA
| | - Gustavo C MacIntosh
- Department of Biochemistry, Biophysics and Molecular Biology, Iowa State University, Ames, IA, 50011, USA
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Divi UK, Rahman T, Krishna P. Gene expression and functional analyses in brassinosteroid-mediated stress tolerance. PLANT BIOTECHNOLOGY JOURNAL 2016; 14:419-32. [PMID: 25973891 DOI: 10.1111/pbi.12396] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/29/2014] [Revised: 03/18/2015] [Accepted: 04/09/2015] [Indexed: 05/07/2023]
Abstract
The plant hormone brassinosteroid (BR) plays essential roles in plant growth and development, while also controlling plant stress responses. This dual ability of BR is intriguing from a mechanistic point of view and as a viable solution for stabilizing crop yields under the changing climatic conditions. Here we report a time course analysis of BR responses under both stress and no-stress conditions, the results of which establish that BR incorporates many stress-related features even under no-stress conditions, which are then accompanied by a dynamic stress response under unfavourable conditions. Found within the BR transcriptome were distinct molecular signatures of two stress hormones, abscisic acid and jasmonic acid, which were correlated with enhanced endogenous levels of the two hormones in BR-treated seedlings. The marked presence of genes related to protein metabolism and modification, defence responses and calcium signalling highlights the significance of their associated mechanisms and roles in BR processes. Functional analysis of loss-of-function mutants of a subset of genes selected from the BR transcriptome identified abiotic stress-related roles for ACID PHOSPHATASE5 (ACP5), WRKY33, JACALIN-RELATED LECTIN1-3 (JAC-LEC1-3) and a BR-RESPONSIVE-RECEPTOR-LIKE KINASE (BRRLK). Overall, the results of this study provide a clear link between the molecular changes impacted by BR and its ability to confer broad-range stress tolerance, emphasize the importance of post-translational modification and protein turnover as BR regulatory mechanisms and demonstrate the BR transcriptome as a repertoire of new stress-related regulatory and structural genes.
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Affiliation(s)
- Uday K Divi
- Department of Biology, University of Western Ontario, London, ON, Canada
| | - Tawhidur Rahman
- Department of Biology, University of Western Ontario, London, ON, Canada
| | - Priti Krishna
- Department of Biology, University of Western Ontario, London, ON, Canada
- The School of Environmental and Rural Sciences, The University of New England, Armidale, NSW, Australia
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Chen C, Sun X, Duanmu H, Zhu D, Yu Y, Cao L, Liu A, Jia B, Xiao J, Zhu Y. GsCML27, a Gene Encoding a Calcium-Binding Ef-Hand Protein from Glycine soja, Plays Differential Roles in Plant Responses to Bicarbonate, Salt and Osmotic Stresses. PLoS One 2015; 10:e0141888. [PMID: 26550992 PMCID: PMC4638360 DOI: 10.1371/journal.pone.0141888] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2015] [Accepted: 10/14/2015] [Indexed: 01/29/2023] Open
Abstract
Calcium, as the most widely accepted messenger, plays an important role in plant stress responses through calcium-dependent signaling pathways. The calmodulin-like family genes (CMLs) encode Ca2+ sensors and function in signaling transduction in response to environmental stimuli. However, until now, the function of plant CML proteins, especially soybean CMLs, is largely unknown. Here, we isolated a Glycine soja CML protein GsCML27, with four conserved EF-hands domains, and identified it as a calcium-binding protein through far-UV CD spectroscopy. We further found that expression of GsCML27 was induced by bicarbonate, salt and osmotic stresses. Interestingly, ectopic expression of GsCML27 in Arabidopsis enhanced plant tolerance to bicarbonate stress, but decreased the salt and osmotic tolerance during the seed germination and early growth stages. Furthermore, we found that ectopic expression of GsCML27 decreases salt tolerance through modifying both the cellular ionic (Na+, K+) content and the osmotic stress regulation. GsCML27 ectopic expression also decreased the expression levels of osmotic stress-responsive genes. Moreover, we also showed that GsCML27 localized in the whole cell, including cytoplasm, plasma membrane and nucleus in Arabidopsis protoplasts and onion epidermal cells, and displayed high expression in roots and embryos. Together, these data present evidence that GsCML27 as a Ca2+-binding EF-hand protein plays a role in plant responses to bicarbonate, salt and osmotic stresses.
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Affiliation(s)
- Chao Chen
- Key Laboratory of Agricultural Biological Functional Genes, Northeast Agricultural University, Harbin, P.R. China
| | - Xiaoli Sun
- Agronomy College, Heilongjiang Bayi Agricultural University, Daqing, P.R. China
| | - Huizi Duanmu
- Key Laboratory of Agricultural Biological Functional Genes, Northeast Agricultural University, Harbin, P.R. China
| | - Dan Zhu
- College of Life Science, Qingdao Agricultural University, Qingdao, P.R. China
| | - Yang Yu
- Key Laboratory of Agricultural Biological Functional Genes, Northeast Agricultural University, Harbin, P.R. China
| | - Lei Cao
- Key Laboratory of Agricultural Biological Functional Genes, Northeast Agricultural University, Harbin, P.R. China
| | - Ailin Liu
- Key Laboratory of Agricultural Biological Functional Genes, Northeast Agricultural University, Harbin, P.R. China
| | - Bowei Jia
- Key Laboratory of Agricultural Biological Functional Genes, Northeast Agricultural University, Harbin, P.R. China
| | - Jialei Xiao
- Key Laboratory of Agricultural Biological Functional Genes, Northeast Agricultural University, Harbin, P.R. China
| | - Yanming Zhu
- Key Laboratory of Agricultural Biological Functional Genes, Northeast Agricultural University, Harbin, P.R. China
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Mutations in the Arabidopsis Lst8 and Raptor genes encoding partners of the TOR complex, or inhibition of TOR activity decrease abscisic acid (ABA) synthesis. Biochem Biophys Res Commun 2015; 467:992-7. [PMID: 26459592 DOI: 10.1016/j.bbrc.2015.10.028] [Citation(s) in RCA: 39] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2015] [Accepted: 10/06/2015] [Indexed: 11/21/2022]
Abstract
The Target of Rapamycin (TOR) kinase regulates essential processes in plant growth and development by modulation of metabolism and translation in response to environmental signals. In this study, we show that abscisic acid (ABA) metabolism is also regulated by the TOR kinase. Indeed ABA hormone level strongly decreases in Lst8-1 and Raptor3g mutant lines as well as in wild-type (WT) Arabidopsis plants treated with AZD-8055, a TOR inhibitor. However the growth and germination of these lines are more sensitive to exogenous ABA. The diminished ABA hormone accumulation is correlated with lower transcript levels of ZEP, NCED3 and AAO3 biosynthetic enzymes, and higher transcript amount of the CYP707A2 gene encoding a key-enzyme in abscisic acid catabolism. These results suggest that the TOR signaling pathway is implicated in the regulation of ABA accumulation in Arabidopsis.
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Chien PS, Nam HG, Chen YR. A salt-regulated peptide derived from the CAP superfamily protein negatively regulates salt-stress tolerance in Arabidopsis. JOURNAL OF EXPERIMENTAL BOTANY 2015; 66:5301-13. [PMID: 26093145 PMCID: PMC4526916 DOI: 10.1093/jxb/erv263] [Citation(s) in RCA: 50] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/16/2023]
Abstract
High salinity has negative impacts on plant growth through altered water uptake and ion-specific toxicities. Plants have therefore evolved an intricate regulatory network in which plant hormones play significant roles in modulating physiological responses to salinity. However, current understanding of the plant peptides involved in this regulatory network remains limited. Here, we identified a salt-regulated peptide in Arabidopsis. The peptide was 11 aa and was derived from the C terminus of a cysteine-rich secretory proteins, antigen 5, and pathogenesis-related 1 proteins (CAP) superfamily. This peptide was found by searching homologues in Arabidopsis using the precursor of a tomato CAP-derived peptide (CAPE) that was initially identified as an immune signal. In searching for a CAPE involved in salt responses, we screened CAPE precursor genes that showed salt-responsive expression and found that the PROAtCAPE1 (AT4G33730) gene was regulated by salinity. We confirmed the endogenous Arabidopsis CAP-derived peptide 1 (AtCAPE1) by mass spectrometry and found that a key amino acid residue in PROAtCAPE1 is critical for AtCAPE1 production. Moreover, although PROAtCAPE1 was expressed mainly in the roots, AtCAPE1 was discovered to be upregulated systemically upon salt treatment. The salt-induced AtCAPE1 negatively regulated salt tolerance by suppressing several salt-tolerance genes functioning in the production of osmolytes, detoxification, stomatal closure control, and cell membrane protection. This discovery demonstrates that AtCAPE1, a homologue of tomato immune regulator CAPE1, plays an important role in the regulation of salt stress responses. Our discovery thus suggests that the peptide may function in a trade-off between pathogen defence and salt tolerance.
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Affiliation(s)
- Pei-Shan Chien
- Molecular and Biological Agricultural Sciences Program, Taiwan International Graduate Program, Academia Sinica, Taipei 115, Taiwan Agricultural Biotechnology Research Center, Academia Sinica, Taipei 115, Taiwan Graduate Institute of Biotechnology, National Chung-Hsing University, Taichung 402, Taiwan
| | - Hong Gil Nam
- Center for Plant Aging Research, Institute for Basic Science, and Department of New Biology, DGIST, Daegu 711-873, Republic of Korea
| | - Yet-Ran Chen
- Molecular and Biological Agricultural Sciences Program, Taiwan International Graduate Program, Academia Sinica, Taipei 115, Taiwan Agricultural Biotechnology Research Center, Academia Sinica, Taipei 115, Taiwan Graduate Institute of Biotechnology, National Chung-Hsing University, Taichung 402, Taiwan
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Shafeinie A, Mohammadi V, Alizadeh H, Zali AA. Overexpression of Arabidopsis Dehydration-Responsive Element-Binding protein 2A confers tolerance to salinity stress to transgenic canola. Pak J Biol Sci 2015; 17:619-29. [PMID: 26030994 DOI: 10.3923/pjbs.2014.619.629] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Stress responsive transcriptional regulation is an adaptive strategy of plants that alleviates the adverse effects of environmental stresses. The ectopic overexpression of Dehydration-Responsive Element Binding transcription factors (DREBs) either in homologous or in heterologous plants are the classical transcriptional regulators involved in plant responses to drought, salt and cold stresses. To elucidate the transcriptional mechanism associated with the DREB2A gene after removing PEST sequence, which acts as a signal peptide for protein degradation, 34 transgenic T0 canola plants overexpressing DREB2A were developed. The quantitative Real time PCR of transgenic plants showed higher expression of downstream stress-responsive genes including COR14, HSF3, HSP70, PEROX and RD20. The transgenic plants exhibited enhanced tolerance to salt stress. At the high concentration of NaCl the growth of non-transformed plants had been clearly diminished, whereas transgenic line was survived. These results indicated that transformed DREB2A gene might improve the plant response to salinity in transgenic canola plants.
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Shimada TL, Hara-Nishimura I. Leaf oil bodies are subcellular factories producing antifungal oxylipins. CURRENT OPINION IN PLANT BIOLOGY 2015; 25:145-50. [PMID: 26051035 DOI: 10.1016/j.pbi.2015.05.019] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/28/2014] [Revised: 05/15/2015] [Accepted: 05/18/2015] [Indexed: 05/25/2023]
Abstract
Oil bodies act as lipid storage compartments in plant cells. In seeds they supply energy for germination and early seedling growth. Oil bodies are also present in the leaves of many vascular plants, but their function in leaves has been poorly understood. Recent studies with oil bodies from senescent Arabidopsis thaliana leaves identified two enzymes, peroxygenase (CLO3) and α-dioxygenase (α-DOX), which together catalyze a coupling reaction to produce an antifungal compound (2-hydroxy-octadecanoic acid) from α-linolenic acid. Leaf oil bodies also have other enzymes including lipoxygenases, phospholipases, and triacylglycerol lipases. Hence, leaf oil bodies might function as intracellular factories to efficiently produce stable compounds via unstable intermediates by concentrating the enzymes and hydrophobic substrates.
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Affiliation(s)
- Takashi L Shimada
- Department of Biological Sciences, Graduate School of Science, University of Tokyo, Tokyo 113-0033, Japan
| | - Ikuko Hara-Nishimura
- Department of Botany, Graduate School of Science, Kyoto University, Kyoto 606-8502, Japan.
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Purkrtová Z, Chardot T, Froissard M. N-terminus of seed caleosins is essential for lipid droplet sorting but not for lipid accumulation. Arch Biochem Biophys 2015; 579:47-54. [PMID: 26032334 DOI: 10.1016/j.abb.2015.05.008] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2015] [Revised: 05/19/2015] [Accepted: 05/21/2015] [Indexed: 11/26/2022]
Abstract
Caleosin, a calcium-binding protein associated with plant lipid droplets, stimulates lipid accumulation when heterologously expressed in Saccharomyces cerevisiae. Accumulated lipids are stored in cytoplasmic lipid droplets that are stabilised by incorporated caleosin. We designed a set of mutants affecting putative crucial sites for caleosin function and association with lipid droplets, i.e. the N-terminus, the EF-hand motif and the proline-knot motif. We investigated the effect of introduced mutations on caleosin capacity to initiate lipid accumulation and on caleosin sorting within cell as well as on its association with lipid droplets. Our results strongly suggest that the N-terminal domain is essential for proper protein sorting and targeting to lipid droplets but not for enhancing lipid accumulation.
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Affiliation(s)
- Zita Purkrtová
- INRA, Institut Jean-Pierre Bourgin, UMR 1318, ERL CNRS 3559, Saclay Plant Sciences, RD10, 78026 Versailles, France; AgroParisTech, Institut Jean-Pierre Bourgin, UMR 1318, ERL CNRS 3559, Saclay Plant Sciences, RD10, 78026 Versailles, France.
| | - Thierry Chardot
- INRA, Institut Jean-Pierre Bourgin, UMR 1318, ERL CNRS 3559, Saclay Plant Sciences, RD10, 78026 Versailles, France; AgroParisTech, Institut Jean-Pierre Bourgin, UMR 1318, ERL CNRS 3559, Saclay Plant Sciences, RD10, 78026 Versailles, France.
| | - Marine Froissard
- INRA, Institut Jean-Pierre Bourgin, UMR 1318, ERL CNRS 3559, Saclay Plant Sciences, RD10, 78026 Versailles, France; AgroParisTech, Institut Jean-Pierre Bourgin, UMR 1318, ERL CNRS 3559, Saclay Plant Sciences, RD10, 78026 Versailles, France.
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Blée E, Boachon B, Burcklen M, Le Guédard M, Hanano A, Heintz D, Ehlting J, Herrfurth C, Feussner I, Bessoule JJ. The reductase activity of the Arabidopsis caleosin RESPONSIVE TO DESSICATION20 mediates gibberellin-dependent flowering time, abscisic acid sensitivity, and tolerance to oxidative stress. PLANT PHYSIOLOGY 2014; 166:109-24. [PMID: 25056921 PMCID: PMC4149700 DOI: 10.1104/pp.114.245316] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/16/2014] [Accepted: 07/22/2014] [Indexed: 05/20/2023]
Abstract
Contrasting with the wealth of information available on the multiple roles of jasmonates in plant development and defense, knowledge about the functions and the biosynthesis of hydroxylated oxylipins remains scarce. By expressing the caleosin RESPONSIVE TO DESSICATION20 (RD20) in Saccharomyces cerevisiae, we show that the recombinant protein possesses an unusual peroxygenase activity with restricted specificity toward hydroperoxides of unsaturated fatty acid. Accordingly, Arabidopsis (Arabidopsis thaliana) plants overexpressing RD20 accumulate the product 13-hydroxy-9,11,15-octadecatrienoic acid, a linolenate-derived hydroxide. These plants exhibit elevated levels of reactive oxygen species (ROS) associated with early gibberellin-dependent flowering and abscisic acid hypersensitivity at seed germination. These phenotypes are dependent on the presence of active RD20, since they are abolished in the rd20 null mutant and in lines overexpressing RD20, in which peroxygenase was inactivated by a point mutation of a catalytic histidine residue. RD20 also confers tolerance against stress induced by Paraquat, Rose Bengal, heavy metal, and the synthetic auxins 1-naphthaleneacetic acid and 2,4-dichlorophenoxyacetic acid. Under oxidative stress, 13-hydroxy-9,11,15-octadecatrienoic acid still accumulates in RD20-overexpressing lines, but this lipid oxidation is associated with reduced ROS levels, minor cell death, and delayed floral transition. A model is discussed where the interplay between fatty acid hydroxides generated by RD20 and ROS is counteracted by ethylene during development in unstressed environments.
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Affiliation(s)
- Elizabeth Blée
- Institut de Biologie Moléculaire des Plantes, Unité Propre de Recherche 2357-Université de Strasbourg, 67083 Strasbourg cedex, France (E.B., B.B., M.B., A.H., D.H., J.E.)Laboratoire de Biogénèse Membranaire, Bâtiment A3-Institut National de la Recherche Agronomique Bordeaux Aquitaine, 33140 Villenave d'Ornon, France (M.L.G., J.-J.B.); andGeorg-August-University, Albrecht-von-Haller Institute, Department of Plant Biochemistry, 37077 Goettingen, Germany (C.H., I.F.)
| | - Benoît Boachon
- Institut de Biologie Moléculaire des Plantes, Unité Propre de Recherche 2357-Université de Strasbourg, 67083 Strasbourg cedex, France (E.B., B.B., M.B., A.H., D.H., J.E.)Laboratoire de Biogénèse Membranaire, Bâtiment A3-Institut National de la Recherche Agronomique Bordeaux Aquitaine, 33140 Villenave d'Ornon, France (M.L.G., J.-J.B.); andGeorg-August-University, Albrecht-von-Haller Institute, Department of Plant Biochemistry, 37077 Goettingen, Germany (C.H., I.F.)
| | - Michel Burcklen
- Institut de Biologie Moléculaire des Plantes, Unité Propre de Recherche 2357-Université de Strasbourg, 67083 Strasbourg cedex, France (E.B., B.B., M.B., A.H., D.H., J.E.)Laboratoire de Biogénèse Membranaire, Bâtiment A3-Institut National de la Recherche Agronomique Bordeaux Aquitaine, 33140 Villenave d'Ornon, France (M.L.G., J.-J.B.); andGeorg-August-University, Albrecht-von-Haller Institute, Department of Plant Biochemistry, 37077 Goettingen, Germany (C.H., I.F.)
| | - Marina Le Guédard
- Institut de Biologie Moléculaire des Plantes, Unité Propre de Recherche 2357-Université de Strasbourg, 67083 Strasbourg cedex, France (E.B., B.B., M.B., A.H., D.H., J.E.)Laboratoire de Biogénèse Membranaire, Bâtiment A3-Institut National de la Recherche Agronomique Bordeaux Aquitaine, 33140 Villenave d'Ornon, France (M.L.G., J.-J.B.); andGeorg-August-University, Albrecht-von-Haller Institute, Department of Plant Biochemistry, 37077 Goettingen, Germany (C.H., I.F.)
| | - Abdulsamie Hanano
- Institut de Biologie Moléculaire des Plantes, Unité Propre de Recherche 2357-Université de Strasbourg, 67083 Strasbourg cedex, France (E.B., B.B., M.B., A.H., D.H., J.E.)Laboratoire de Biogénèse Membranaire, Bâtiment A3-Institut National de la Recherche Agronomique Bordeaux Aquitaine, 33140 Villenave d'Ornon, France (M.L.G., J.-J.B.); andGeorg-August-University, Albrecht-von-Haller Institute, Department of Plant Biochemistry, 37077 Goettingen, Germany (C.H., I.F.)
| | - Dimitri Heintz
- Institut de Biologie Moléculaire des Plantes, Unité Propre de Recherche 2357-Université de Strasbourg, 67083 Strasbourg cedex, France (E.B., B.B., M.B., A.H., D.H., J.E.)Laboratoire de Biogénèse Membranaire, Bâtiment A3-Institut National de la Recherche Agronomique Bordeaux Aquitaine, 33140 Villenave d'Ornon, France (M.L.G., J.-J.B.); andGeorg-August-University, Albrecht-von-Haller Institute, Department of Plant Biochemistry, 37077 Goettingen, Germany (C.H., I.F.)
| | - Jürgen Ehlting
- Institut de Biologie Moléculaire des Plantes, Unité Propre de Recherche 2357-Université de Strasbourg, 67083 Strasbourg cedex, France (E.B., B.B., M.B., A.H., D.H., J.E.)Laboratoire de Biogénèse Membranaire, Bâtiment A3-Institut National de la Recherche Agronomique Bordeaux Aquitaine, 33140 Villenave d'Ornon, France (M.L.G., J.-J.B.); andGeorg-August-University, Albrecht-von-Haller Institute, Department of Plant Biochemistry, 37077 Goettingen, Germany (C.H., I.F.)
| | - Cornelia Herrfurth
- Institut de Biologie Moléculaire des Plantes, Unité Propre de Recherche 2357-Université de Strasbourg, 67083 Strasbourg cedex, France (E.B., B.B., M.B., A.H., D.H., J.E.)Laboratoire de Biogénèse Membranaire, Bâtiment A3-Institut National de la Recherche Agronomique Bordeaux Aquitaine, 33140 Villenave d'Ornon, France (M.L.G., J.-J.B.); andGeorg-August-University, Albrecht-von-Haller Institute, Department of Plant Biochemistry, 37077 Goettingen, Germany (C.H., I.F.)
| | - Ivo Feussner
- Institut de Biologie Moléculaire des Plantes, Unité Propre de Recherche 2357-Université de Strasbourg, 67083 Strasbourg cedex, France (E.B., B.B., M.B., A.H., D.H., J.E.)Laboratoire de Biogénèse Membranaire, Bâtiment A3-Institut National de la Recherche Agronomique Bordeaux Aquitaine, 33140 Villenave d'Ornon, France (M.L.G., J.-J.B.); andGeorg-August-University, Albrecht-von-Haller Institute, Department of Plant Biochemistry, 37077 Goettingen, Germany (C.H., I.F.)
| | - Jean-Jacques Bessoule
- Institut de Biologie Moléculaire des Plantes, Unité Propre de Recherche 2357-Université de Strasbourg, 67083 Strasbourg cedex, France (E.B., B.B., M.B., A.H., D.H., J.E.)Laboratoire de Biogénèse Membranaire, Bâtiment A3-Institut National de la Recherche Agronomique Bordeaux Aquitaine, 33140 Villenave d'Ornon, France (M.L.G., J.-J.B.); andGeorg-August-University, Albrecht-von-Haller Institute, Department of Plant Biochemistry, 37077 Goettingen, Germany (C.H., I.F.)
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Song W, Qin Y, Zhu Y, Yin G, Wu N, Li Y, Hu Y. Delineation of plant caleosin residues critical for functional divergence, positive selection and coevolution. BMC Evol Biol 2014; 14:124. [PMID: 24913827 PMCID: PMC4057654 DOI: 10.1186/1471-2148-14-124] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2013] [Accepted: 06/03/2014] [Indexed: 11/22/2022] Open
Abstract
Background The caleosin genes encode proteins with a single conserved EF hand calcium-binding domain and comprise small gene families found in a wide range of plant species. These proteins may be involved in many cellular and biological processes coupled closely to the synthesis, degradation, or stability of oil bodies. Although previous studies of this protein family have been reported for Arabidopsis and other species, understanding of the evolution of the caleosin gene family in plants remains inadequate. Results In this study, comparative genomic analysis was performed to investigate the phylogenetic relationships, evolutionary history, functional divergence, positive selection, and coevolution of caleosins. First, 84 caleosin genes were identified from five main lineages that included 15 species. Phylogenetic analysis placed these caleosins into five distinct subfamilies (sub I–V), including two subfamilies that have not been previously identified. Among these subfamilies, sub II coincided with the distinct P-caleosin isoform recently identified in the pollen oil bodies of lily; caleosin genes from the same lineage tended to be clustered together in the phylogenetic tree. A special motif was determined to be related with the classification of caleosins, which may have resulted from a deletion in sub I and sub III occurring after the evolutionary divergence of monocot and dicot species. Additionally, several segmentally and tandem-duplicated gene pairs were identified from seven species, and further analysis revealed that caleosins of different species did not share a common expansion model. The ages of each pair of duplications were calculated, and most were consistent with the time of genome-wide duplication events in each species. Functional divergence analysis showed that changes in functional constraints have occurred between subfamilies I/IV, II/IV, and II/V, and some critical amino acid sites were identified during the functional divergence. Additional analyses revealed that caleosins were under positive selection during evolution, and seven candidate amino acid sites (70R, 74G, 88 L, 89G, 100 K, 106A, 107S) for positive selection were identified. Interestingly, the critical amino acid residues of functional divergence and positive selection were mainly located in C-terminal domain. Finally, three groups of coevolved amino acid sites were identified. Among these coevolved sites, seven from group 2 were located in the Ca2+-binding region of crucial importance. Conclusion In this study, the evolutionary and expansion patterns of the caleosin gene family were predicted, and a series of amino acid sites relevant to their functional divergence, adaptive evolution, and coevolution were identified. These findings provide data to facilitate further functional analysis of caleosin gene families in the plant lineage.
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Affiliation(s)
| | | | | | | | | | | | - Yingkao Hu
- College of Life Sciences, Capital Normal University, Beijing 100048, China.
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41
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Khalil HB, Brunetti SC, Pham UM, Maret D, Laroche A, Gulick PJ. Characterization of the caleosin gene family in the Triticeae. BMC Genomics 2014; 15:239. [PMID: 24673767 PMCID: PMC3986672 DOI: 10.1186/1471-2164-15-239] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2013] [Accepted: 02/22/2014] [Indexed: 12/01/2022] Open
Abstract
Background The caleosin genes encode proteins with a single conserved EF hand calcium-binding domain and comprise small gene families found in a wide range of plant species. Some members of the gene family have been shown to be upregulated by environmental stresses including low water availability and high salinity. Caleosin 3 from wheat has been shown to interact with the α-subunit of the heterotrimeric G proteins, and to act as a GTPase activating protein (GAP). This study characterizes the size and diversity of the gene family in wheat and related species and characterizes the differential tissue-specific expression of members of the gene family. Results A total of 34 gene family members that belong to eleven paralogous groups of caleosins were identified in the hexaploid bread wheat, T. aestivum. Each group was represented by three homeologous copies of the gene located on corresponding homeologous chromosomes, except the caleosin 10, which has four gene copies. Ten gene family members were identified in diploid barley, Hordeum vulgare, and in rye, Secale cereale, seven in Brachypodium distachyon, and six in rice, Oryza sativa. The analysis of gene expression was assayed in triticale and rye by RNA-Seq analysis of 454 sequence sets and members of the gene family were found to have diverse patterns of gene expression in the different tissues that were sampled in rye and in triticale, the hybrid hexaploid species derived from wheat and rye. Expression of the gene family in wheat and barley was also previously determined by microarray analysis, and changes in expression during development and in response to environmental stresses are presented. Conclusions The caleosin gene family had a greater degree of expansion in the Triticeae than in the other monocot species, Brachypodium and rice. The prior implication of one member of the gene family in the stress response and heterotrimeric G protein signaling, points to the potential importance of the caleosin gene family. The complexity of the family and differential expression in various tissues and under conditions of abiotic stress suggests the possibility that caleosin family members may play diverse roles in signaling and development that warrants further investigation. Electronic supplementary material The online version of this article (doi:10.1186/1471-2164-15-239) contains supplementary material, which is available to authorized users.
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Affiliation(s)
| | | | | | | | | | - Patrick J Gulick
- Biology Department, Concordia University, 7141 Sherbrooke W, Montreal, QC H4B 1R6, Canada.
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Li XY, Liu X, Yao Y, Li YH, Liu S, He CY, Li JM, Lin YY, Li L. Overexpression of Arachis hypogaea AREB1 gene enhances drought tolerance by modulating ROS scavenging and maintaining endogenous ABA content. Int J Mol Sci 2013; 14:12827-42. [PMID: 23783278 PMCID: PMC3709814 DOI: 10.3390/ijms140612827] [Citation(s) in RCA: 49] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/24/2013] [Revised: 05/21/2013] [Accepted: 05/31/2013] [Indexed: 01/23/2023] Open
Abstract
AhAREB1 (Arachis hypogaea Abscisic-acid Response Element Binding Protein 1) is a member of the basic domain leucine zipper (bZIP)-type transcription factor in peanut. Previously, we found that expression of AhAREB1 was specifically induced by abscisic acid (ABA), dehydration and drought. To understand the drought defense mechanism regulated by AhAREB1, transgenic Arabidopsis overexpressing AhAREB1 was conducted in wild-type (WT), and a complementation experiment was employed to ABA non-sensitivity mutant abi5 (abscisic acid-insensitive 5). Constitutive expression of AhAREB1 confers water stress tolerance and is highly sensitive to exogenous ABA. Microarray and further real-time PCR analysis revealed that drought stress, reactive oxygen species (ROS) scavenging, ABA synthesis/metabolism-related genes and others were regulated in transgenic Arabidopsis overexpressing AhAREB1. Accordingly, low level of ROS, but higher ABA content was detected in the transgenic Arabidopsis plants’ overexpression of AhAREB1. Taken together, it was concluded that AhAREB1 modulates ROS accumulation and endogenous ABA level to improve drought tolerance in transgenic Arabidopsis.
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Affiliation(s)
- Xiao-Yun Li
- Guangdong Provincial Key Lab of Biotechnology for Plant Development, College of Life Science, South China Normal University, Guangzhou 510631, China; E-Mails: (X.-Y.L.); (X.L.); (Y.Y.); (Y.-H.L.); (S.L.); (C.-Y.H.); (J.-M.L.); (Y.-Y.L.)
| | - Xu Liu
- Molecular Analysis and Genetic Improvement Center, South China Botanical Garden, Chinese Academy of Science, Guangzhou 510650, China
| | - Yao Yao
- Guangdong Provincial Key Lab of Biotechnology for Plant Development, College of Life Science, South China Normal University, Guangzhou 510631, China; E-Mails: (X.-Y.L.); (X.L.); (Y.Y.); (Y.-H.L.); (S.L.); (C.-Y.H.); (J.-M.L.); (Y.-Y.L.)
| | - Yi-Hao Li
- Guangdong Provincial Key Lab of Biotechnology for Plant Development, College of Life Science, South China Normal University, Guangzhou 510631, China; E-Mails: (X.-Y.L.); (X.L.); (Y.Y.); (Y.-H.L.); (S.L.); (C.-Y.H.); (J.-M.L.); (Y.-Y.L.)
| | - Shuai Liu
- Guangdong Provincial Key Lab of Biotechnology for Plant Development, College of Life Science, South China Normal University, Guangzhou 510631, China; E-Mails: (X.-Y.L.); (X.L.); (Y.Y.); (Y.-H.L.); (S.L.); (C.-Y.H.); (J.-M.L.); (Y.-Y.L.)
| | - Chao-Yong He
- Guangdong Provincial Key Lab of Biotechnology for Plant Development, College of Life Science, South China Normal University, Guangzhou 510631, China; E-Mails: (X.-Y.L.); (X.L.); (Y.Y.); (Y.-H.L.); (S.L.); (C.-Y.H.); (J.-M.L.); (Y.-Y.L.)
| | - Jian-Mei Li
- Guangdong Provincial Key Lab of Biotechnology for Plant Development, College of Life Science, South China Normal University, Guangzhou 510631, China; E-Mails: (X.-Y.L.); (X.L.); (Y.Y.); (Y.-H.L.); (S.L.); (C.-Y.H.); (J.-M.L.); (Y.-Y.L.)
| | - Ying-Ying Lin
- Guangdong Provincial Key Lab of Biotechnology for Plant Development, College of Life Science, South China Normal University, Guangzhou 510631, China; E-Mails: (X.-Y.L.); (X.L.); (Y.Y.); (Y.-H.L.); (S.L.); (C.-Y.H.); (J.-M.L.); (Y.-Y.L.)
| | - Ling Li
- Guangdong Provincial Key Lab of Biotechnology for Plant Development, College of Life Science, South China Normal University, Guangzhou 510631, China; E-Mails: (X.-Y.L.); (X.L.); (Y.Y.); (Y.-H.L.); (S.L.); (C.-Y.H.); (J.-M.L.); (Y.-Y.L.)
- Author to whom correspondence should be addressed; E-Mail: ; Tel.: +86-020-8521-1378; Fax: +86-020-8521-5535
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Umate P. Comparative genomics of the lipid-body-membrane proteins oleosin, caleosin and steroleosin in magnoliophyte, lycophyte and bryophyte. GENOMICS PROTEOMICS & BIOINFORMATICS 2012; 10:345-53. [PMID: 23317702 PMCID: PMC5054715 DOI: 10.1016/j.gpb.2012.08.006] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/21/2012] [Revised: 06/08/2012] [Accepted: 08/01/2012] [Indexed: 11/17/2022]
Abstract
Lipid bodies store oils in the form of triacylglycerols. Oleosin, caleosin and steroleosin are unique proteins localized on the surface of lipid bodies in seed plants. This study has identified genes encoding lipid body proteins oleosin, caleosin and steroleosin in the genomes of five plants: Arabidopsis thaliana, Oryza sativa, Populus trichocarpa, Selaginella moellendorffii and Physcomitrella patens. The protein sequence alignment indicated that each oleosin protein contains a highly-conserved proline knot motif, and proline knob motif is well conserved in steroleosin proteins, while caleosin proteins possess the Dx[D/N]xDG-containing calcium-binding motifs. The identification of motifs (proline knot and knob) and conserved amino acids at active site was further supported by the sequence logos. The phylogenetic analysis revealed the presence of magnoliophyte- and bryophyte-specific subgroups. We analyzed the public microarray data for expression of oleosin, caleosin and steroleosin in Arabidopsis and rice during the vegetative and reproductive stages, or under abiotic stresses. Our results indicated that genes encoding oleosin, caleosin and steroleosin proteins were expressed predominantly in plant seeds. This work may facilitate better understanding of the members of lipid-body-membrane proteins in diverse organisms and their gene expression in model plants Arabidopsis and rice.
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Affiliation(s)
- Pavan Umate
- Department of Botany, Kakatiya University, Warangal 506009, India.
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Abstract
Hydrophobic storage neutral lipids are stably preserved in specialized organelles termed oil bodies in the aqueous cytosolic compartment of plant cells via encapsulation with surfactant molecules including phospholipids and integral proteins. To date, three classes of integral proteins, termed oleosin, caleosin, and steroleosin, have been identified in oil bodies of angiosperm seeds. Proposed structures, targeting traffic routes, and biological functions of these three integral oil-body proteins were summarized and discussed. In the viewpoint of evolution, isoforms of oleosin and caleosin are found in oil bodies of pollens as well as those of more primitive species; moreover, caleosin- and steroleosin-like proteins are also present in other subcellular locations besides oil bodies. Technically, artificial oil bodies of structural stability similar to native ones were successfully constituted and seemed to serve as a useful tool for both basic research studies and biotechnological applications.
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Affiliation(s)
- Jason T. C. Tzen
- Graduate Institute of Biotechnology, National Chung Hsing University, Taichung 402, Taiwan
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Chen DH, Chyan CL, Jiang PL, Chen CS, Tzen JTC. The same oleosin isoforms are present in oil bodies of rice embryo and aleurone layer while caleosin exists only in those of the embryo. PLANT PHYSIOLOGY AND BIOCHEMISTRY : PPB 2012; 60:18-24. [PMID: 22892331 DOI: 10.1016/j.plaphy.2012.07.022] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/30/2012] [Accepted: 07/23/2012] [Indexed: 06/01/2023]
Abstract
Oil bodies of similar sizes were observed in the cells of embryo and aleurone layer of rice seeds, and remained their structural integrity in vitro after isolation. Comparably, two abundant oleosin isoforms were found in both preparations of oil bodies isolated from the embryo and the aleurone layer. Immunological detection and mass spectrometric analyses indicated that the two oleosin isoforms, termed oleosin-H and oleosin-L, in the embryo and those in the aleurone layer were identical proteins encoded by the same genes (BAF12898.1 and BAF15387.1 for oleosin-H and oleosin-L, respectively). In contrast, one caleosin was found in oil bodies isolated from the embryo but not those isolated from the aleurone layer. Immunological staining of rice seeds confirms that oleosin is present in both embryo and aleurone layer while caleosin exists only in embryo. Caleosin extracted from oil bodies of rice embryo migrated faster on SDS-PAGE in the presence of Ca(2+), in a manner identical to caleosin extracted from sesame oil bodies. Similar to other known monocot caleosins, the rice caleosin possesses an N-terminal appendix that is absent in dicotyledonous caleosins.
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Affiliation(s)
- Da-Huang Chen
- Graduate Institute of Biotechnology, National Chung-Hsing University, Taichung 402, Taiwan
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Murphy DJ. The dynamic roles of intracellular lipid droplets: from archaea to mammals. PROTOPLASMA 2012; 249:541-85. [PMID: 22002710 DOI: 10.1007/s00709-011-0329-7] [Citation(s) in RCA: 170] [Impact Index Per Article: 14.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/14/2011] [Accepted: 09/28/2011] [Indexed: 05/02/2023]
Abstract
During the past decade, there has been a paradigm shift in our understanding of the roles of intracellular lipid droplets (LDs). New genetic, biochemical and imaging technologies have underpinned these advances, which are revealing much new information about these dynamic organelles. This review takes a comparative approach by examining recent work on LDs across the whole range of biological organisms from archaea and bacteria, through yeast and Drosophila to mammals, including humans. LDs probably evolved originally in microorganisms as temporary stores of excess dietary lipid that was surplus to the immediate requirements of membrane formation/turnover. LDs then acquired roles as long-term carbon stores that enabled organisms to survive episodic lack of nutrients. In multicellular organisms, LDs went on to acquire numerous additional roles including cell- and organism-level lipid homeostasis, protein sequestration, membrane trafficking and signalling. Many pathogens of plants and animals subvert their host LD metabolism as part of their infection process. Finally, malfunctions in LDs and associated proteins are implicated in several degenerative diseases of modern humans, among the most serious of which is the increasingly prevalent constellation of pathologies, such as obesity and insulin resistance, which is associated with metabolic syndrome.
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Affiliation(s)
- Denis J Murphy
- Division of Biological Sciences, University of Glamorgan, Cardiff, CF37 4AT, UK.
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Kim JM, To TK, Ishida J, Matsui A, Kimura H, Seki M. Transition of chromatin status during the process of recovery from drought stress in Arabidopsis thaliana. PLANT & CELL PHYSIOLOGY 2012; 53:847-56. [PMID: 22505693 DOI: 10.1093/pcp/pcs053] [Citation(s) in RCA: 128] [Impact Index Per Article: 10.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/20/2023]
Abstract
Changes in chromatin status are correlated with gene regulation of biological processes such as development and stress responses in plants. In this study, we focused on the transition of chromatin status toward gene repression during the process of recovery from drought stress of drought-inducible genes (RD20, RD29A and AtGOLS2) and a rehydration-inducible gene (ProDH). In response to drought, RNA polymerase II was recruited on the drought-inducible genes and rapidly disappeared after rehydration, although mRNA levels of these genes were maintained to some degree after rehydration, suggesting that the transcriptional activities of these genes were rapidly inactivated by rehydration treatment. Histone H3K9ac was enriched by drought and rapidly removed from these regions by rehydration. In contrast, histone H3K4me3 was gradually decreased by rehydration but was maintained at low levels after rehydration, suggesting that H3K4me3 functions as an epigenetic mark of stress memory. These results show that the transcriptional activity and chromatin status are rapidly changed from an active to inactive mode during the recovery process. Our results demonstrate that histone modifications are correlated with the inactivation of drought-inducible genes during the recovery process by rehydration.
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Affiliation(s)
- Jong-Myong Kim
- Plant Genomic Network Research Team, RIKEN Plant Science Center, 1-7-22 Suehiro-cho, Tsurumi-ku, Yokohama 230-0045, Kanagawa, Japan
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Khalil HB, Wang Z, Wright JA, Ralevski A, Donayo AO, Gulick PJ. Heterotrimeric Gα subunit from wheat (Triticum aestivum), GA3, interacts with the calcium-binding protein, Clo3, and the phosphoinositide-specific phospholipase C, PI-PLC1. PLANT MOLECULAR BIOLOGY 2011; 77:145-158. [PMID: 21725861 DOI: 10.1007/s11103-011-9801-1] [Citation(s) in RCA: 41] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/19/2010] [Accepted: 06/04/2011] [Indexed: 05/31/2023]
Abstract
The canonical Gα subunit of the heterotrimeric G protein complex from wheat (Triticum aestivum), GA3, and the calcium-binding protein, Clo3, were revealed to interact both in vivo and in vitro and Clo3 was shown to enhance the GTPase activity of GA3. Clo3 is a member of the caleosin gene family in wheat with a single EF-hand domain and is induced during cold acclimation. Bimolecular Fluorescent Complementation (BiFC) was used to localize the interaction between Clo3 and GA3 to the plasma membrane (PM). Even though heterotrimeric G-protein signaling and Ca²⁺ signaling have both been shown to play a role in the response to environmental stresses in plants, little is known about the interaction between calcium-binding proteins and Gα. The GAP activity of Clo3 towards GA3 suggests it may play a role in the inactivation of GA3 as part of the stress response in plants. GA3 was also shown to interact with the phosphoinositide-specific phospholipase C, PI-PLC1, not only in the PM but also in the endoplasmic reticulum (ER). Surprisingly, Clo3 was also shown to interact with PI-PLC1 in the PM and ER. In vitro analysis of the protein-protein interaction showed that the interaction of Clo3 with GA3 and PI-PLC1 is enhanced by high Ca²⁺ levels. Three-way affinity characterizations with GA3, Clo3 and PI-PLC1 showed the interaction with Clo3 to be competitive, which suggests that Clo3 may play a role in the Ca²⁺-triggered feedback regulation of both GA3 and PI-PLC1. This hypothesis was further supported by the demonstration that Clo3 has GAP activity with GA3.
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Affiliation(s)
- Hala Badr Khalil
- Department of Biology, Concordia University, 7141 Sherbrooke W., Montreal, QC H4B1R6, Canada
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Zienkiewicz K, Zienkiewicz A, Rodríguez-García MI, Castro AJ. Characterization of a caleosin expressed during olive (Olea europaea L.) pollen ontogeny. BMC PLANT BIOLOGY 2011; 11:122. [PMID: 21884593 PMCID: PMC3180362 DOI: 10.1186/1471-2229-11-122] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/12/2011] [Accepted: 08/31/2011] [Indexed: 05/21/2023]
Abstract
BACKGROUND The olive tree is an oil-storing species, with pollen being the second most active site in storage lipid biosynthesis. Caleosins are proteins involved in storage lipid mobilization during seed germination. Despite the existence of different lipidic structures in the anther, there are no data regarding the presence of caleosins in this organ to date. The purpose of the present work was to characterize a caleosin expressed in the olive anther over different key stages of pollen ontogeny, as a first approach to unravel its biological function in reproduction. RESULTS A 30 kDa caleosin was identified in the anther tissues by Western blot analysis. Using fluorescence and transmission electron microscopic immunolocalization methods, the protein was first localized in the tapetal cells at the free microspore stage. Caleosins were released to the anther locule and further deposited onto the sculptures of the pollen exine. As anthers developed, tapetal cells showed the presence of structures constituted by caleosin-containing lipid droplets closely packed and enclosed by ER-derived cisternae and vesicles. After tapetal cells lost their integrity, the caleosin-containing remnants of the tapetum filled the cavities of the mature pollen exine, forming the pollen coat. In developing microspores, this caleosin was initially detected on the exine sculptures. During pollen maturation, caleosin levels progressively increased in the vegetative cell, concurrently with the number of oil bodies. The olive pollen caleosin was able to bind calcium in vitro. Moreover, PEGylation experiments supported the structural conformation model suggested for caleosins from seed oil bodies. CONCLUSIONS In the olive anther, a caleosin is expressed in both the tapetal and germ line cells, with its synthesis independently regulated. The pollen oil body-associated caleosin is synthesized by the vegetative cell, whereas the protein located on the pollen exine and its coating has a sporophytic origin. The biological significance of the caleosin in the reproductive process in species possessing lipid-storing pollen might depend on its subcellular emplacement. The pollen inner caleosin may be involved in OB biogenesis during pollen maturation. The protein located on the outside might rather play a function in pollen-stigma interaction during pollen hydration and germination.
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Affiliation(s)
- Krzysztof Zienkiewicz
- Department of Biochemistry, Cellular and Molecular Biology of Plants, Estación Experimental del Zaidín, Consejo Superior de Investigaciones Científicas (CSIC), Profesor Albareda 1, 18008, Granada, Spain
- Department of Cell Biology, Institute of General and Molecular Biology, Nicolaus Copernicus University, Gargarina 9, 87-100, Toruń, Poland
| | - Agnieszka Zienkiewicz
- Department of Biochemistry, Cellular and Molecular Biology of Plants, Estación Experimental del Zaidín, Consejo Superior de Investigaciones Científicas (CSIC), Profesor Albareda 1, 18008, Granada, Spain
- Chair of Plant Physiology and Biochemistry, Institute of General and Molecular Biology, Nicolaus Copernicus University, Gargarina 9, 87-100, Toruń, Poland
| | - María Isabel Rodríguez-García
- Department of Biochemistry, Cellular and Molecular Biology of Plants, Estación Experimental del Zaidín, Consejo Superior de Investigaciones Científicas (CSIC), Profesor Albareda 1, 18008, Granada, Spain
| | - Antonio J Castro
- Department of Biochemistry, Cellular and Molecular Biology of Plants, Estación Experimental del Zaidín, Consejo Superior de Investigaciones Científicas (CSIC), Profesor Albareda 1, 18008, Granada, Spain
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Kim YY, Jung KW, Yoo KS, Jeung JU, Shin JS. A stress-responsive caleosin-like protein, AtCLO4, acts as a negative regulator of ABA responses in Arabidopsis. PLANT & CELL PHYSIOLOGY 2011; 52:874-84. [PMID: 21471120 DOI: 10.1093/pcp/pcr039] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/21/2023]
Abstract
Caleosins or related sequences have been found in a wide range of higher plants. In Arabidopsis, seed-specific caleosins are viewed as oil-body (OB)-associated proteins that possess Ca(2+)-dependent peroxygenase activity and are involved in processes of lipid degradation. Recent experimental evidence suggests that one of the Arabidopsis non-seed caleosins, AtCLO3, is involved in controlling stomatal aperture during the drought response; the roles of the other caleosin-like proteins in Arabidopsis remain largely uncharacterized. We have demonstrated that a novel stress-responsive and OB-associated Ca(2+)-binding caleosin-like protein, AtCLO4, is expressed in non-seed tissues of Arabidopsis, including guard cells, and down-regulated following exposure to exogenous ABA and salt stress. At the seed germination stage, a loss-of-function mutant (atclo4) was hypersensitive to ABA, salt and mannitol stresses, whereas AtCLO4-overexpressing (Ox) lines were more hyposensitive to those stresses than the wild type. In adult stage, atclo4 mutant and AtCLO4-Ox plants showed enhanced and decreased drought tolerance, respectively. Following exposure to exogenous ABA, the expression of key ABA-dependent regulatory genes, such as ABF3 and ABF4, was up-regulated in the atclo4 mutant, while it was down-regulated in AtCLO4-Ox lines. Based on these results, we propose that the OB-associated Ca(2+)-binding AtCLO4 protein acts as a negative regulator of ABA responses in Arabidopsis.
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Affiliation(s)
- Yun Young Kim
- School of Life Sciences and Biotechnology, Korea University, Seoul 136-701, Korea
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