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Li J, Zhao R, Liu J, Yao J, Ma S, Yin K, Zhang Y, Liu Z, Yan C, Zhao N, Zhou X, Chen S. Populus euphratica GRP2 Interacts with Target mRNAs to Negatively Regulate Salt Tolerance by Interfering with Photosynthesis, Na +, and ROS Homeostasis. Int J Mol Sci 2024; 25:2046. [PMID: 38396725 PMCID: PMC10888501 DOI: 10.3390/ijms25042046] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2023] [Revised: 01/17/2024] [Accepted: 02/06/2024] [Indexed: 02/25/2024] Open
Abstract
The transcription of glycine-rich RNA-binding protein 2 (PeGRP2) transiently increased in the roots and shoots of Populus euphratica (a salt-resistant poplar) upon initial salt exposure and tended to decrease after long-term NaCl stress (100 mM, 12 days). PeGRP2 overexpression in the hybrid Populus tremula × P. alba '717-1B4' (P. × canescens) increased its salt sensitivity, which was reflected in the plant's growth and photosynthesis. PeGRP2 contains a conserved RNA recognition motif domain at the N-terminus, and RNA affinity purification (RAP) sequencing was developed to enrich the target mRNAs that physically interacted with PeGRP2 in P. × canescens. RAP sequencing combined with RT-qPCR revealed that NaCl decreased the transcripts of PeGRP2-interacting mRNAs encoding photosynthetic proteins, antioxidative enzymes, ATPases, and Na+/H+ antiporters in this transgenic poplar. Specifically, PeGRP2 negatively affected the stability of the target mRNAs encoding the photosynthetic proteins PETC and RBCMT; antioxidant enzymes SOD[Mn], CDSP32, and CYB1-2; ATPases AHA11, ACA8, and ACA9; and the Na+/H+ antiporter NHA1. This resulted in (i) a greater reduction in Fv/Fm, YII, ETR, and Pn; (ii) less pronounced activation of antioxidative enzymes; and (iii) a reduced ability to maintain Na+ homeostasis in the transgenic poplars during long-term salt stress, leading to their lowered ability to tolerate salinity stress.
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Affiliation(s)
- Jing Li
- State Key Laboratory of Efficient Production of Forest Resources, College of Biological Science and Technology, Beijing Forestry University, Beijing 100083, China; (J.L.); (R.Z.); (J.L.); (S.M.); (K.Y.); (Y.Z.); (Z.L.); (C.Y.); (N.Z.); (X.Z.)
| | - Rui Zhao
- State Key Laboratory of Efficient Production of Forest Resources, College of Biological Science and Technology, Beijing Forestry University, Beijing 100083, China; (J.L.); (R.Z.); (J.L.); (S.M.); (K.Y.); (Y.Z.); (Z.L.); (C.Y.); (N.Z.); (X.Z.)
| | - Jian Liu
- State Key Laboratory of Efficient Production of Forest Resources, College of Biological Science and Technology, Beijing Forestry University, Beijing 100083, China; (J.L.); (R.Z.); (J.L.); (S.M.); (K.Y.); (Y.Z.); (Z.L.); (C.Y.); (N.Z.); (X.Z.)
| | - Jun Yao
- Guangdong Provincial Key Laboratory of Silviculture, Protection and Utilization, Guangdong Academy of Forestry, Guangzhou 510520, China;
| | - Siyuan Ma
- State Key Laboratory of Efficient Production of Forest Resources, College of Biological Science and Technology, Beijing Forestry University, Beijing 100083, China; (J.L.); (R.Z.); (J.L.); (S.M.); (K.Y.); (Y.Z.); (Z.L.); (C.Y.); (N.Z.); (X.Z.)
| | - Kexin Yin
- State Key Laboratory of Efficient Production of Forest Resources, College of Biological Science and Technology, Beijing Forestry University, Beijing 100083, China; (J.L.); (R.Z.); (J.L.); (S.M.); (K.Y.); (Y.Z.); (Z.L.); (C.Y.); (N.Z.); (X.Z.)
| | - Ying Zhang
- State Key Laboratory of Efficient Production of Forest Resources, College of Biological Science and Technology, Beijing Forestry University, Beijing 100083, China; (J.L.); (R.Z.); (J.L.); (S.M.); (K.Y.); (Y.Z.); (Z.L.); (C.Y.); (N.Z.); (X.Z.)
| | - Zhe Liu
- State Key Laboratory of Efficient Production of Forest Resources, College of Biological Science and Technology, Beijing Forestry University, Beijing 100083, China; (J.L.); (R.Z.); (J.L.); (S.M.); (K.Y.); (Y.Z.); (Z.L.); (C.Y.); (N.Z.); (X.Z.)
| | - Caixia Yan
- State Key Laboratory of Efficient Production of Forest Resources, College of Biological Science and Technology, Beijing Forestry University, Beijing 100083, China; (J.L.); (R.Z.); (J.L.); (S.M.); (K.Y.); (Y.Z.); (Z.L.); (C.Y.); (N.Z.); (X.Z.)
| | - Nan Zhao
- State Key Laboratory of Efficient Production of Forest Resources, College of Biological Science and Technology, Beijing Forestry University, Beijing 100083, China; (J.L.); (R.Z.); (J.L.); (S.M.); (K.Y.); (Y.Z.); (Z.L.); (C.Y.); (N.Z.); (X.Z.)
| | - Xiaoyang Zhou
- State Key Laboratory of Efficient Production of Forest Resources, College of Biological Science and Technology, Beijing Forestry University, Beijing 100083, China; (J.L.); (R.Z.); (J.L.); (S.M.); (K.Y.); (Y.Z.); (Z.L.); (C.Y.); (N.Z.); (X.Z.)
| | - Shaoliang Chen
- State Key Laboratory of Efficient Production of Forest Resources, College of Biological Science and Technology, Beijing Forestry University, Beijing 100083, China; (J.L.); (R.Z.); (J.L.); (S.M.); (K.Y.); (Y.Z.); (Z.L.); (C.Y.); (N.Z.); (X.Z.)
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Cheng K, Zhang C, Lu Y, Li J, Tang H, Ma L, Zhu H. The Glycine-Rich RNA-Binding Protein Is a Vital Post-Transcriptional Regulator in Crops. PLANTS (BASEL, SWITZERLAND) 2023; 12:3504. [PMID: 37836244 PMCID: PMC10575402 DOI: 10.3390/plants12193504] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/29/2023] [Revised: 10/02/2023] [Accepted: 10/05/2023] [Indexed: 10/15/2023]
Abstract
Glycine-rich RNA binding proteins (GR-RBPs), a branch of RNA binding proteins (RBPs), play integral roles in regulating various aspects of RNA metabolism regulation, such as RNA processing, transport, localization, translation, and stability, and ultimately regulate gene expression and cell fate. However, our current understanding of GR-RBPs has predominantly been centered on Arabidopsis thaliana, a model plant for investigating plant growth and development. Nonetheless, an increasing body of literature has emerged in recent years, shedding light on the presence and functions of GRPs in diverse crop species. In this review, we not only delineate the distinctive structural domains of plant GR-RBPs but also elucidate several contemporary mechanisms of GR-RBPs in the post-transcriptional regulation of RNA. These mechanisms encompass intricate processes, including RNA alternative splicing, polyadenylation, miRNA biogenesis, phase separation, and RNA translation. Furthermore, we offer an exhaustive synthesis of the diverse roles that GR-RBPs fulfill within crop plants. Our overarching objective is to provide researchers and practitioners in the field of agricultural genetics with valuable insights that may inform and guide the application of plant genetic engineering for enhanced crop development and sustainable agriculture.
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Affiliation(s)
- Ke Cheng
- The College of Food Science and Nutritional Engineering, China Agricultural University, Beijing 100083, China; (K.C.); (Y.L.); (J.L.); (H.T.); (L.M.)
| | - Chunjiao Zhang
- Supervision, Inspection & Testing Center of Agricultural Products Quality, Ministry of Agriculture and Rural Affairs, Beijing 100083, China;
| | - Yao Lu
- The College of Food Science and Nutritional Engineering, China Agricultural University, Beijing 100083, China; (K.C.); (Y.L.); (J.L.); (H.T.); (L.M.)
| | - Jinyan Li
- The College of Food Science and Nutritional Engineering, China Agricultural University, Beijing 100083, China; (K.C.); (Y.L.); (J.L.); (H.T.); (L.M.)
| | - Hui Tang
- The College of Food Science and Nutritional Engineering, China Agricultural University, Beijing 100083, China; (K.C.); (Y.L.); (J.L.); (H.T.); (L.M.)
| | - Liqun Ma
- The College of Food Science and Nutritional Engineering, China Agricultural University, Beijing 100083, China; (K.C.); (Y.L.); (J.L.); (H.T.); (L.M.)
| | - Hongliang Zhu
- The College of Food Science and Nutritional Engineering, China Agricultural University, Beijing 100083, China; (K.C.); (Y.L.); (J.L.); (H.T.); (L.M.)
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Ma L, Yang Y, Wang Y, Cheng K, Zhou X, Li J, Zhang J, Li R, Zhang L, Wang K, Zeng N, Gong Y, Zhu D, Deng Z, Qu G, Zhu B, Fu D, Luo Y, Zhu H. SlRBP1 promotes translational efficiency via SleIF4A2 to maintain chloroplast function in tomato. THE PLANT CELL 2022; 34:2747-2764. [PMID: 35385118 PMCID: PMC9252502 DOI: 10.1093/plcell/koac104] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/19/2021] [Accepted: 03/05/2022] [Indexed: 06/01/2023]
Abstract
Many glycine-rich RNA-binding proteins (GR-RBPs) have critical functions in RNA processing and metabolism. Here, we describe a role for the tomato (Solanum lycopersicum) GR-RBP SlRBP1 in regulating mRNA translation. We found that SlRBP1 knockdown mutants (slrbp1) displayed reduced accumulation of total chlorophyll and impaired chloroplast ultrastructure. These phenotypes were accompanied by deregulation of the levels of numerous key transcripts associated with chloroplast functions in slrbp1. Furthermore, native RNA immunoprecipitation-sequencing (nRIP-seq) recovered 61 SlRBP1-associated RNAs, most of which are involved in photosynthesis. SlRBP1 binding to selected target RNAs was validated by nRIP-qPCR. Intriguingly, the accumulation of proteins encoded by SlRBP1-bound transcripts, but not the mRNAs themselves, was reduced in slrbp1 mutants. Polysome profiling followed by RT-qPCR assays indicated that the polysome occupancy of target RNAs was lower in slrbp1 plants than in wild-type. Furthermore, SlRBP1 interacted with the eukaryotic translation initiation factor SleIF4A2. Silencing of SlRBP1 significantly reduced SleIF4A2 binding to SlRBP1-target RNAs. Taking these observations together, we propose that SlRBP1 binds to and channels RNAs onto the SleIF4A2 translation initiation complex and promotes the translation of its target RNAs to regulate chloroplast functions.
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Affiliation(s)
- Liqun Ma
- The College of Food Science and Nutritional Engineering, China Agricultural University, Beijing 100083, China
| | | | - Yuqiu Wang
- School of Advanced Agricultural Sciences and School of Life Sciences, Peking University, Beijing 100871, China
| | - Ke Cheng
- The College of Food Science and Nutritional Engineering, China Agricultural University, Beijing 100083, China
| | - Xiwen Zhou
- The College of Food Science and Nutritional Engineering, China Agricultural University, Beijing 100083, China
| | - Jinyan Li
- The College of Food Science and Nutritional Engineering, China Agricultural University, Beijing 100083, China
| | - Jingyu Zhang
- The College of Food Science and Nutritional Engineering, China Agricultural University, Beijing 100083, China
| | | | - Lingling Zhang
- The College of Food Science and Nutritional Engineering, China Agricultural University, Beijing 100083, China
| | - Keru Wang
- The College of Food Science and Nutritional Engineering, China Agricultural University, Beijing 100083, China
| | - Ni Zeng
- The College of Food Science and Nutritional Engineering, China Agricultural University, Beijing 100083, China
| | - Yanyan Gong
- School of Advanced Agricultural Sciences and School of Life Sciences, Peking University, Beijing 100871, China
| | - Danmeng Zhu
- School of Advanced Agricultural Sciences and School of Life Sciences, Peking University, Beijing 100871, China
| | - Zhiping Deng
- State Key Laboratory for Managing Biotic and Chemical Threats to the Quality and Safety of Agro-products, Institute of Virology and Biotechnology, Zhejiang Academy of Agricultural Sciences, Hangzhou, Zhejiang 310021, China
| | - Guiqin Qu
- The College of Food Science and Nutritional Engineering, China Agricultural University, Beijing 100083, China
| | - Benzhong Zhu
- The College of Food Science and Nutritional Engineering, China Agricultural University, Beijing 100083, China
| | - Daqi Fu
- The College of Food Science and Nutritional Engineering, China Agricultural University, Beijing 100083, China
| | - Yunbo Luo
- The College of Food Science and Nutritional Engineering, China Agricultural University, Beijing 100083, China
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Ma L, Cheng K, Li J, Deng Z, Zhang C, Zhu H. Roles of Plant Glycine-Rich RNA-Binding Proteins in Development and Stress Responses. Int J Mol Sci 2021; 22:ijms22115849. [PMID: 34072567 PMCID: PMC8198583 DOI: 10.3390/ijms22115849] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/13/2021] [Revised: 05/27/2021] [Accepted: 05/28/2021] [Indexed: 01/02/2023] Open
Abstract
In recent years, much progress has been made in elucidating the functional roles of plant glycine-rich RNA-binding proteins (GR-RBPs) during development and stress responses. Canonical GR-RBPs contain an RNA recognition motif (RRM) or a cold-shock domain (CSD) at the N-terminus and a glycine-rich domain at the C-terminus, which have been associated with several different RNA processes, such as alternative splicing, mRNA export and RNA editing. However, many aspects of GR-RBP function, the targeting of their RNAs, interacting proteins and the consequences of the RNA target process are not well understood. Here, we discuss recent findings in the field, newly defined roles for GR-RBPs and the actions of GR-RBPs on target RNA metabolism.
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Affiliation(s)
- Liqun Ma
- The College of Food Science and Nutritional Engineering, China Agricultural University, Beijing 100083, China; (L.M.); (K.C.); (J.L.); (Z.D.)
| | - Ke Cheng
- The College of Food Science and Nutritional Engineering, China Agricultural University, Beijing 100083, China; (L.M.); (K.C.); (J.L.); (Z.D.)
| | - Jinyan Li
- The College of Food Science and Nutritional Engineering, China Agricultural University, Beijing 100083, China; (L.M.); (K.C.); (J.L.); (Z.D.)
| | - Zhiqi Deng
- The College of Food Science and Nutritional Engineering, China Agricultural University, Beijing 100083, China; (L.M.); (K.C.); (J.L.); (Z.D.)
| | - Chunjiao Zhang
- Supervision, Inspection & Testing Center of Agricultural Products Quality, Ministry of Agriculture and Rural Affairs, Beijing 100083, China;
| | - Hongliang Zhu
- The College of Food Science and Nutritional Engineering, China Agricultural University, Beijing 100083, China; (L.M.); (K.C.); (J.L.); (Z.D.)
- Correspondence:
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Wu W, Yan Y. Chloroplast proteome analysis of Nicotiana tabacum overexpressing TERF1 under drought stress condition. BOTANICAL STUDIES 2018; 59:26. [PMID: 30374844 PMCID: PMC6206318 DOI: 10.1186/s40529-018-0239-5] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/19/2018] [Accepted: 10/17/2018] [Indexed: 05/11/2023]
Abstract
BACKGROUND Chloroplast is indispensable for plant response to environmental stresses, growth and development, whose function is regulated by different plant hormones. The chloroplast proteome is encoded by chloroplast genome and nuclear genome, which play essential roles in plant photosynthesis, metabolism and other biological processes. Ethylene response factors (ERFs) are key transcription factors in activating the ethylene signaling pathway and plant response to abiotic stress. But we know little about how ethylene regulates plastid function under drought stress condition. In this study we utilized tobacco overexpressing tomato ethylene responsive factor 1 (TERF1), an ERF transcription factor isolated from tomato, to investigate its effects on the plastid proteome under drought stress condition by method of iTRAQ technology. RESULTS Results show that TERF1 represses the genes encoding the photosynthetic apparatus at both transcriptional and translational level, but the genes involved in carbon fixation are significantly induced by TERF1. TERF1 regulates multiple retrograde signaling pathways, providing a new mechanism for regulating nuclear gene expression. TERF1 also regulates plant utilization of phosphorus (Pi) and nitrogen (N). We find that several metabolic and signaling pathways related with Pi are significantly repressed and gene expression analysis shows that TERF1 significantly represses the Pi transport from root to shoot. However, the N metabolism is upregulated by TERF1 as shown by the activation of different amino acids biosynthesis pathways due to the induction of glutamine synthetase and stabilization of nitrate reductase although the root-to-shoot N transport is also reduced. TERF1 also regulates other core metabolic pathways and secondary metabolic pathways that are important for plant growth, development and response to environmental stresses. Gene set linkage analysis was applied for the upregulated proteins by TERF1, showing some new potential for regulating plant response to drought stress by TERF1. CONCLUSIONS Our research reveals effects of ethylene signaling on plastid proteome related with two key biological processes, including photosynthesis and nutrition utilization. We also provide a new mechanism to regulate nuclear gene expression by ERF1 transcription factor through retrograde signals in chloroplast. These results can enrich our knowledge about ERF1 transcription factor and function of ethylene signaling pathway.
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Affiliation(s)
- Wei Wu
- Graduate School of Chinese Academy of Agricultural Sciences, No. 12 Zhongguancun South St., Haidian District, Beijing, 100081 People’s Republic of China
| | - Yanchun Yan
- Graduate School of Chinese Academy of Agricultural Sciences, No. 12 Zhongguancun South St., Haidian District, Beijing, 100081 People’s Republic of China
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Wang B, Wang G, Shen F, Zhu S. A Glycine-Rich RNA-Binding Protein, CsGR-RBP3, Is Involved in Defense Responses Against Cold Stress in Harvested Cucumber ( Cucumis sativus L.) Fruit. FRONTIERS IN PLANT SCIENCE 2018; 9:540. [PMID: 29740470 PMCID: PMC5925850 DOI: 10.3389/fpls.2018.00540] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/10/2018] [Accepted: 04/06/2018] [Indexed: 05/09/2023]
Abstract
Plant glycine-rich RNA-binding proteins (GR-RBPs) have been shown to play important roles in response to abiotic stresses in actively proliferating organs such as young plants, root tips, and flowers, but their roles in chilling responses of harvested fruit remains largely unknown. Here, we investigated the role of CsGR-RBP3 in the chilling response of cucumber fruit. Pre-storage cold acclimation at 10°C (PsCA) for 3 days significantly enhanced chilling tolerance of cucumber fruit compared with the control fruit that were stored at 5°C. In the control fruit, only one of the six cucumber CsGR-RBP genes, CsGR-RBP2, was enhanced whereas the other five, i.e., CsGR-RBP3, CsGR-RBP4, CsGR-RBP5, CsGR-RBP-blt801, and CsGR-RBP-RZ1A were not. However, in the fruit exposed to PsCA before storage at 5°C, CsGR-RBP2 transcript levels were not obviously different from those in the controls, whereas the other five were highly upregulated, with CsGR-RBP3 the most significantly induced. Treatment with endogenous ABA and NO biosynthesis inhibitors, tungstate and L-nitro-arginine methyl ester, respectively, prior to PsCA treatment, clearly downregulated CsGR-RBP3 expression and significantly aggravated chilling injury. These results suggest a strong connection between CsGR-RBP3 expression and chilling tolerance in cucumber fruit. Transient expression in tobacco suggests CsGR-RBP3 was located in the mitochondria, implying a role for CsGR-RBP3 in maintaining mitochondria-related functions under low temperature. Arabidopsis lines overexpressing CsGR-RBP3 displayed faster growth at 23°C, lower electrolyte leakage and higher Fv/Fm ratio at 0°C, and higher survival rate at -20°C, than wild-type plants. Under cold stress conditions, Arabidopsis plants overexpressing CsGR-RBP3 displayed lower reactive oxygen species levels, and higher catalase and superoxide dismutase expression and activities, compared with the wild-type plants. In addition, overexpression of CsGR-RBP3 significantly upregulated nine Arabidopsis genes involved in defense responses to various stresses, including chilling. These results strongly suggest CsGR-RBP3 plays a positive role in defense against chilling stress.
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Affiliation(s)
| | | | | | - Shijiang Zhu
- Guangdong Provincial Key Laboratory of Postharvest Science of Fruits and Vegetables, Key Laboratory of Biology and Genetic Improvement of Horticultural Crops-South China, Ministry of Agriculture, College of Horticulture, South China Agricultural University, Guangzhou, China
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Li M, Wei F, Tawfall A, Tang M, Saettele A, Wang X. Overexpression of patatin-related phospholipase AIIIδ altered plant growth and increased seed oil content in camelina. PLANT BIOTECHNOLOGY JOURNAL 2015; 13:766-78. [PMID: 25557877 DOI: 10.1111/pbi.12304] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/04/2014] [Revised: 10/21/2014] [Accepted: 10/27/2014] [Indexed: 05/04/2023]
Abstract
Camelina sativa is a Brassicaceae oilseed species being explored as a biofuel and industrial oil crop. A growing number of studies have indicated that the turnover of phosphatidylcholine plays an important role in the synthesis and modification of triacylglycerols. This study manipulated the expression of a patatin-related phospholipase AIIIδ (pPLAIIIδ) in camelina to determine its effect on seed oil content and plant growth. Constitutive overexpression of pPLAIIIδ under the control of the constitutive cauliflower mosaic 35S promoter resulted in a significant increase in seed oil content and a decrease in cellulose content. In addition, the content of major membrane phospholipids, phosphatidylcholine and phosphatidylethanolamine, in 35S::pPLAIIIδ plants was increased. However, these changes in 35S::pPLAIIIδ camelina were associated with shorter cell length, leaves, stems, and seed pods and a decrease in overall seed production. When pPLAIIIδ was expressed under the control of the seed specific, β-conglycinin promoter, the seed oil content was increased without compromising plant growth. The results suggest that pPLAIIIδ alters the carbon partitioning by decreasing cellulose content and increasing oil content in camelina.
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Affiliation(s)
- Maoyin Li
- Department of Biology, University of Missouri, St. Louis, MO, USA
- Donald Danforth Plant Science Center, St. Louis, MO, USA
| | - Fang Wei
- Department of Biology, University of Missouri, St. Louis, MO, USA
- Donald Danforth Plant Science Center, St. Louis, MO, USA
| | - Amanda Tawfall
- Department of Biology, University of Missouri, St. Louis, MO, USA
- Donald Danforth Plant Science Center, St. Louis, MO, USA
| | - Michelle Tang
- Department of Biology, University of Missouri, St. Louis, MO, USA
- Donald Danforth Plant Science Center, St. Louis, MO, USA
| | - Allison Saettele
- Department of Biology, University of Missouri, St. Louis, MO, USA
- Donald Danforth Plant Science Center, St. Louis, MO, USA
| | - Xuemin Wang
- Department of Biology, University of Missouri, St. Louis, MO, USA
- Donald Danforth Plant Science Center, St. Louis, MO, USA
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Vollmann J, Eynck C. Camelina as a sustainable oilseed crop: Contributions of plant breeding and genetic engineering. Biotechnol J 2015; 10:525-35. [DOI: 10.1002/biot.201400200] [Citation(s) in RCA: 76] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2014] [Revised: 11/13/2014] [Accepted: 01/21/2015] [Indexed: 01/31/2023]
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Jang HY, Rhee J, Carlson JE, Ahn SJ. The Camelina aquaporin CsPIP2;1 is regulated by phosphorylation at Ser273, but not at Ser277, of the C-terminus and is involved in salt- and drought-stress responses. JOURNAL OF PLANT PHYSIOLOGY 2014; 171:1401-12. [PMID: 25046761 DOI: 10.1016/j.jplph.2014.06.009] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/02/2014] [Revised: 06/28/2014] [Accepted: 06/28/2014] [Indexed: 05/08/2023]
Abstract
Aquaporin (AQP) proteins are involved in water homeostasis in cells at all taxonomic levels of life. Phosphorylation of some AQPs has been proposed to regulate water permeability via gating of the channel itself. We analyzed plasma membrane intrinsic proteins (PIP) from Camelina and characterized their biological functions under both stressful and favorable conditions. A three-dimensional theoretical model of the Camelina AQP proteins was built by homology modeling which could prove useful in further functional characterization of AQPs. CsPIP2;1 was strongly and constitutively expressed in roots and leaves of Camelina, suggesting that this gene is related to maintenance of homeostasis during salt and drought stresses. CsPIP2s exhibited water channel activity in Xenopus oocytes. We then examined the roles of CsPIP2;1 phosphorylation at Ser273 and Ser277 in the regulation of water permeability using phosphorylation mutants. A single deletion strain of CsPIP2;1 was generated to serve as the primary host for testing AQP expression constructs. A Ser277 to alanine mutation (to prevent phosphorylation) did not change CsPIP2;1 water permeability while a Ser273 mutation to alanine did affect water permeability. Furthermore, a CsPIP2;1 point mutation when ectopically expressed in yeast resulted in lower growth in salt and drought conditions compared with controls, and confirmation of Ser273 as the phosphorylation site. Our results support the idea that post-translational modifications in the Ser273 regulatory domains of the C-terminus fine tune water flux through CsPIP2;1.
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Affiliation(s)
- Ha-Young Jang
- Department of Bioenergy Science and Technology, Chonnam National University, Gwangju 500-757, Republic of Korea
| | - Jiye Rhee
- Department of Experimental Plant Biology, Faculty of Science, University of South Bohemia, Branisovska 31, Ceske Budejovice, Czech Republic
| | - John E Carlson
- Department of Bioenergy Science and Technology, Chonnam National University, Gwangju 500-757, Republic of Korea; Department of Ecosystem Science and Management, Pennsylvania State University, University Park, PA 16802, USA
| | - Sung-Ju Ahn
- Department of Bioenergy Science and Technology, Chonnam National University, Gwangju 500-757, Republic of Korea.
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Lee SY, Seok HY, Tarte VN, Woo DH, Le DH, Lee EH, Moon YH. The Arabidopsis chloroplast protein S-RBP11 is involved in oxidative and salt stress responses. PLANT CELL REPORTS 2014; 33:837-847. [PMID: 24413693 DOI: 10.1007/s00299-013-1560-9] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/05/2013] [Revised: 12/25/2013] [Accepted: 12/29/2013] [Indexed: 06/03/2023]
Abstract
S-RBP11, a chloroplast protein, which was isolated using activation tagging system, is shown to be the first Arabidopsis small RNA-binding group protein involved in oxidative and salt stress responses. Activation tagging is one of the most powerful tools in reverse genetics. In this study, we isolated S-RBP11, encoding a small RNA-binding protein in Arabidopsis, by salt-resistant activation tagging line screen and then characterized its function in the abiotic stress response. The isolated activation tagging line of S-RBP11 as well as transgenic plants overexpressing S-RBP11 showed increased tolerance to salt and MV stresses compared to WT plants, whereas s-rbp11 mutants were more sensitive to salt stresses. Transcription of S-RBP11 was elevated upon MV treatment but not NaCl or cold treatment. Interestingly, S-RBP11 protein was localized in the chloroplast and the N-terminal 34 amino acid region of S-RBP11 was necessary for its chloroplast targeting. Our results suggest that S-RBP11 is a chloroplast protein involved in the responses to salt and oxidative stresses.
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Affiliation(s)
- Sun-Young Lee
- Department of Molecular Biology, Pusan National University, Busan, 609-735, Korea
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