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Luo D, Wang C, Mubeen S, Rehman M, Cao S, Yue J, Pan J, Jin G, Li R, Chen T, Chen P. HcLEA113, a late embryogenesis abundant protein gene, positively regulates drought-stress responses in kenaf. PHYSIOLOGIA PLANTARUM 2024; 176:e14506. [PMID: 39191701 DOI: 10.1111/ppl.14506] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/26/2024] [Revised: 08/12/2024] [Accepted: 08/16/2024] [Indexed: 08/29/2024]
Abstract
Late embryogenesis abundant (LEA) proteins have been widely recognized for their role in various abiotic stress responses in higher plants. Nevertheless, the specific mechanism responsible for the function of LEA proteins in plants has not yet been explored. This research involved the isolation and characterization of HcLEA113 from kenaf, revealing a significant increase in its expression in response to drought stress. When HcLEA113 was introduced into yeast, it resulted in an improved survival rate under drought conditions. Furthermore, the overexpression of HcLEA113 in tobacco plants led to enhanced tolerance to drought stress. Specifically, HcLEA113-OE plants exhibited higher germination rates, longer root lengths, greater chlorophyll content, and higher relative water content under drought stress compared to wild-type (WT) plants, while their relative conductivity was significantly lower than that of WT plants. Further physiological measurements revealed that the proline content, soluble sugars, and antioxidant activities of WT and HcLEA113-OE tobacco leaves increased significantly under drought stress, with greater changes in HcLEA113-OE plants than WT. The increase in hydrogen peroxide (H2O2), superoxide anions (O2 -), and malondialdehyde (MDA) content was significantly lower in HcLEA113-OE lines than in WT plants. Additionally, HcLEA113-OE plants can activate reactive oxygen species (ROS)- and osmotic-related genes in response to drought stress. On the other hand, silencing the HcLEA113 gene through virus-induced gene silencing (VIGS) in kenaf plants led to notable growth suppression when exposed to drought conditions, manifesting as decreased plant height and dry weight. Meanwhile, antioxidant enzymes' activity significantly decreased and the ROS content increased. This study offers valuable insights for future research on the genetic engineering of drought resistance in plants.
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Affiliation(s)
- Dengjie Luo
- College of Agriculture, Guangxi University; Guangxi Key Laboratory of Agro-environment and Agric-products safety; Key Laboratory of Crop Genetic Breeding and Germplasm Innovation, Nanning, China
- College of Life Science and Technology, Guangxi University, Nanning, China
| | - Caijin Wang
- College of Agriculture, Guangxi University; Guangxi Key Laboratory of Agro-environment and Agric-products safety; Key Laboratory of Crop Genetic Breeding and Germplasm Innovation, Nanning, China
| | - Samavia Mubeen
- College of Agriculture, Guangxi University; Guangxi Key Laboratory of Agro-environment and Agric-products safety; Key Laboratory of Crop Genetic Breeding and Germplasm Innovation, Nanning, China
| | - Muzammal Rehman
- College of Agriculture, Guangxi University; Guangxi Key Laboratory of Agro-environment and Agric-products safety; Key Laboratory of Crop Genetic Breeding and Germplasm Innovation, Nanning, China
| | - Shan Cao
- College of Agriculture, Guangxi University; Guangxi Key Laboratory of Agro-environment and Agric-products safety; Key Laboratory of Crop Genetic Breeding and Germplasm Innovation, Nanning, China
| | - Jiao Yue
- College of Agriculture, Guangxi University; Guangxi Key Laboratory of Agro-environment and Agric-products safety; Key Laboratory of Crop Genetic Breeding and Germplasm Innovation, Nanning, China
| | - Jiao Pan
- College of Agriculture, Guangxi University; Guangxi Key Laboratory of Agro-environment and Agric-products safety; Key Laboratory of Crop Genetic Breeding and Germplasm Innovation, Nanning, China
| | - Gang Jin
- Guangxi Subtropical Crops Research Institute, Nanning, China
| | - Ru Li
- College of Life Science and Technology, Guangxi University, Nanning, China
| | - Tao Chen
- Guangxi Subtropical Crops Research Institute, Nanning, China
| | - Peng Chen
- College of Agriculture, Guangxi University; Guangxi Key Laboratory of Agro-environment and Agric-products safety; Key Laboratory of Crop Genetic Breeding and Germplasm Innovation, Nanning, China
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Zhao Y, Hao Y, Dong Z, Tang W, Wang X, Li J, Wang L, Hu Y, Fang L, Guan X, Gu F, Liu Z, Zhang Z. Identification and expression analysis of LEA gene family members in pepper (Capsicum annuum L.). FEBS Open Bio 2023; 13:2246-2262. [PMID: 37907961 PMCID: PMC10699114 DOI: 10.1002/2211-5463.13718] [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: 04/03/2023] [Revised: 09/12/2023] [Accepted: 10/17/2023] [Indexed: 11/02/2023] Open
Abstract
Pepper (Capsicum annuum L.) is an economically important crop containing capsaicinoids in the seed and placenta, which has various culinary, medical, and industrial applications. Late embryogenesis abundant (LEA) proteins are a large group of hydrophilic proteins participating in the plant stress response and seed development. However, to date there have been no genome-wide analyses of the LEA gene family in pepper. In the present study, 82 LEA genes were identified in the C. annuum genome and classified into nine subfamilies. Most CaLEA genes contain few introns (≤ 2) and are unevenly distributed across 10 chromosomes. Eight pairs of tandem duplication genes and two pairs of segmental duplication genes were identified in the LEA gene family; these duplicated genes were highly conserved and may have performed similar functions during evolution. Expression profile analysis indicated that CaLEA genes exhibited different tissue expression patterns, especially during embryonic development and stress response, particularly in cold stress. Three out of five CaLEA genes showed induced expression upon cold treatment. In summary, we have comprehensively reviewed the LEA gene family in pepper, offering a new perspective on the evolution of this family.
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Affiliation(s)
- Yongyan Zhao
- Hainan InstituteZhejiang UniversitySanyaChina
- Zhejiang Provincial Key Laboratory of Crop Genetic Resources, Institute of Crop Science, Plant Precision Breeding Academy, College of Agriculture and BiotechnologyZhejiang UniversityHangzhouChina
| | - Yupeng Hao
- Hainan InstituteZhejiang UniversitySanyaChina
- Zhejiang Provincial Key Laboratory of Crop Genetic Resources, Institute of Crop Science, Plant Precision Breeding Academy, College of Agriculture and BiotechnologyZhejiang UniversityHangzhouChina
| | - Zeyu Dong
- Hainan InstituteZhejiang UniversitySanyaChina
- Zhejiang Provincial Key Laboratory of Crop Genetic Resources, Institute of Crop Science, Plant Precision Breeding Academy, College of Agriculture and BiotechnologyZhejiang UniversityHangzhouChina
| | - Wenchen Tang
- Hainan InstituteZhejiang UniversitySanyaChina
- Zhejiang Provincial Key Laboratory of Crop Genetic Resources, Institute of Crop Science, Plant Precision Breeding Academy, College of Agriculture and BiotechnologyZhejiang UniversityHangzhouChina
| | | | - Jun Li
- Hainan InstituteZhejiang UniversitySanyaChina
- Zhejiang Provincial Key Laboratory of Crop Genetic Resources, Institute of Crop Science, Plant Precision Breeding Academy, College of Agriculture and BiotechnologyZhejiang UniversityHangzhouChina
| | - Luyao Wang
- Hainan InstituteZhejiang UniversitySanyaChina
- Zhejiang Provincial Key Laboratory of Crop Genetic Resources, Institute of Crop Science, Plant Precision Breeding Academy, College of Agriculture and BiotechnologyZhejiang UniversityHangzhouChina
| | - Yan Hu
- Hainan InstituteZhejiang UniversitySanyaChina
- Zhejiang Provincial Key Laboratory of Crop Genetic Resources, Institute of Crop Science, Plant Precision Breeding Academy, College of Agriculture and BiotechnologyZhejiang UniversityHangzhouChina
| | - Lei Fang
- Hainan InstituteZhejiang UniversitySanyaChina
- Zhejiang Provincial Key Laboratory of Crop Genetic Resources, Institute of Crop Science, Plant Precision Breeding Academy, College of Agriculture and BiotechnologyZhejiang UniversityHangzhouChina
| | - Xueying Guan
- Hainan InstituteZhejiang UniversitySanyaChina
- Zhejiang Provincial Key Laboratory of Crop Genetic Resources, Institute of Crop Science, Plant Precision Breeding Academy, College of Agriculture and BiotechnologyZhejiang UniversityHangzhouChina
| | - Fenglin Gu
- Spice and Beverage Research Institute, Sanya Research InstituteChinese Academy of Tropical Agricultural Sciences/Hainan Key Laboratory for Biosafety Monitoring and Molecular Breeding in Off‐Season Reproduction RegionsSanyaChina
| | - Ziji Liu
- Tropical Crops Genetic Resources InstituteChinese Academy of Tropical Agricultural Sciences/Key Laboratory of Crop Gene Resources and Germplasm Enhancement in Southern China, Ministry of AgricultureHaikouChina
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Puccio G, Ingraffia R, Mercati F, Amato G, Giambalvo D, Martinelli F, Sunseri F, Frenda AS. Transcriptome changes induced by Arbuscular mycorrhizal symbiosis in leaves of durum wheat (Triticum durum Desf.) promote higher salt tolerance. Sci Rep 2023; 13:116. [PMID: 36596823 PMCID: PMC9810663 DOI: 10.1038/s41598-022-26903-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2022] [Accepted: 12/21/2022] [Indexed: 01/05/2023] Open
Abstract
The salinity of soil is a relevant environmental problem around the world, with climate change raising its relevance, particularly in arid and semiarid areas. Arbuscular Mycorrhizal Fungi (AMF) positively affect plant growth and health by mitigating biotic and abiotic stresses, including salt stress. The mechanisms through which these benefits manifest are, however, still unclear. This work aimed to identify key genes involved in the response to salt stress induced by AMF using RNA-Seq analysis on durum wheat (Triticum turgidum L. subsp. durum Desf. Husn.). Five hundred sixty-three differentially expressed genes (DEGs), many of which involved in pathways related to plant stress responses, were identified. The expression of genes involved in trehalose metabolism, RNA processing, vesicle trafficking, cell wall organization, and signal transduction was significantly enhanced by the AMF symbiosis. A downregulation of genes involved in both enzymatic and non-enzymatic oxidative stress responses as well as amino acids, lipids, and carbohydrates metabolisms was also detected, suggesting a lower oxidative stress condition in the AMF inoculated plants. Interestingly, many transcription factor families, including WRKY, NAC, and MYB, already known for their key role in plant abiotic stress response, were found differentially expressed between treatments. This study provides valuable insights on AMF-induced gene expression modulation and the beneficial effects of plant-AMF interaction in durum wheat under salt stress.
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Affiliation(s)
- Guglielmo Puccio
- grid.10776.370000 0004 1762 5517Department of Agricultural, Food and Forestry Sciences, University of Palermo, Palermo, Italy ,grid.5326.20000 0001 1940 4177Institute of Biosciences and BioResources (IBBR), National Research Council of Italy, Palermo, Italy
| | - Rosolino Ingraffia
- grid.10776.370000 0004 1762 5517Department of Agricultural, Food and Forestry Sciences, University of Palermo, Palermo, Italy ,grid.14095.390000 0000 9116 4836Plant Ecology, Institute of Biology, Freie Universität Berlin, Berlin, Germany ,grid.452299.1Berlin-Brandenburg Institute of Advanced Biodiversity Research, Berlin, Germany
| | - Francesco Mercati
- grid.5326.20000 0001 1940 4177Institute of Biosciences and BioResources (IBBR), National Research Council of Italy, Palermo, Italy
| | - Gaetano Amato
- grid.10776.370000 0004 1762 5517Department of Agricultural, Food and Forestry Sciences, University of Palermo, Palermo, Italy
| | - Dario Giambalvo
- grid.10776.370000 0004 1762 5517Department of Agricultural, Food and Forestry Sciences, University of Palermo, Palermo, Italy
| | - Federico Martinelli
- grid.8404.80000 0004 1757 2304Department of Biology, University of Florence, Sesto Fiorentino, Italy
| | - Francesco Sunseri
- grid.11567.340000000122070761Department of Agraria, University Mediterranea of Reggio Calabria, Reggio Calabria, Italy
| | - Alfonso S. Frenda
- grid.10776.370000 0004 1762 5517Department of Agricultural, Food and Forestry Sciences, University of Palermo, Palermo, Italy
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Investigating the Functional Role of the Cysteine Residue in Dehydrin from the Arctic Mouse-Ear Chickweed Cerastium arcticum. MOLECULES (BASEL, SWITZERLAND) 2022; 27:molecules27092934. [PMID: 35566285 PMCID: PMC9102250 DOI: 10.3390/molecules27092934] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/21/2022] [Revised: 05/03/2022] [Accepted: 05/03/2022] [Indexed: 11/23/2022]
Abstract
The stress-responsive, SK5 subclass, dehydrin gene, CaDHN, has been identified from the Arctic mouse-ear chickweed Cerastium arcticum. CaDHN contains an unusual single cysteine residue (Cys143), which can form intermolecular disulfide bonds. Mutational analysis and a redox experiment confirmed that the dimerization of CaDHN was the result of an intermolecular disulfide bond between the cysteine residues. The biochemical and physiological functions of the mutant C143A were also investigated by in vitro and in vivo assays using yeast cells, where it enhanced the scavenging of reactive oxygen species (ROS) by neutralizing hydrogen peroxide. Our results show that the cysteine residue in CaDHN helps to enhance C. arcticum tolerance to abiotic stress by regulating the dimerization of the intrinsically disordered CaDHN protein, which acts as a defense mechanism against extreme polar environments.
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López-Cordova A, Ramírez-Medina H, Silva-Martinez GA, González-Cruz L, Bernardino-Nicanor A, Huanca-Mamani W, Montero-Tavera V, Tovar-Aguilar A, Ramírez-Pimentel JG, Durán-Figueroa NV, Acosta-García G. LEA13 and LEA30 Are Involved in Tolerance to Water Stress and Stomata Density in Arabidopsis thaliana. PLANTS 2021; 10:plants10081694. [PMID: 34451739 PMCID: PMC8400336 DOI: 10.3390/plants10081694] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/09/2021] [Revised: 08/02/2021] [Accepted: 08/10/2021] [Indexed: 11/16/2022]
Abstract
Late embryogenesis abundant (LEA) proteins are a large protein family that mainly function in protecting cells from abiotic stress, but these proteins are also involved in regulating plant growth and development. In this study, we performed a functional analysis of LEA13 and LEA30 from Arabidopsis thaliana. The results showed that the expression of both genes increased when plants were subjected to drought-stressed conditions. The insertional lines lea13 and lea30 were identified for each gene, and both had a T-DNA element in the regulatory region, which caused the genes to be downregulated. Moreover, lea13 and lea30 were more sensitive to drought stress due to their higher transpiration and stomatal spacing. Microarray analysis of the lea13 background showed that genes involved in hormone signaling, stomatal development, and abiotic stress responses were misregulated. Our results showed that LEA proteins are involved in drought tolerance and participate in stomatal density.
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Affiliation(s)
- Abigael López-Cordova
- Departamento de Ingeniería Bioquímica, Tecnológico Nacional de México/IT de Celaya, Antonio García Cubas Pte. #600 esq. Av. Tecnológico, Celaya 38010, Guanajuato, Mexico; (A.L.-C.); (H.R.-M.); (G.-A.S.-M.); (L.G.-C.); (A.B.-N.)
| | - Humberto Ramírez-Medina
- Departamento de Ingeniería Bioquímica, Tecnológico Nacional de México/IT de Celaya, Antonio García Cubas Pte. #600 esq. Av. Tecnológico, Celaya 38010, Guanajuato, Mexico; (A.L.-C.); (H.R.-M.); (G.-A.S.-M.); (L.G.-C.); (A.B.-N.)
| | - Guillermo-Antonio Silva-Martinez
- Departamento de Ingeniería Bioquímica, Tecnológico Nacional de México/IT de Celaya, Antonio García Cubas Pte. #600 esq. Av. Tecnológico, Celaya 38010, Guanajuato, Mexico; (A.L.-C.); (H.R.-M.); (G.-A.S.-M.); (L.G.-C.); (A.B.-N.)
| | - Leopoldo González-Cruz
- Departamento de Ingeniería Bioquímica, Tecnológico Nacional de México/IT de Celaya, Antonio García Cubas Pte. #600 esq. Av. Tecnológico, Celaya 38010, Guanajuato, Mexico; (A.L.-C.); (H.R.-M.); (G.-A.S.-M.); (L.G.-C.); (A.B.-N.)
| | - Aurea Bernardino-Nicanor
- Departamento de Ingeniería Bioquímica, Tecnológico Nacional de México/IT de Celaya, Antonio García Cubas Pte. #600 esq. Av. Tecnológico, Celaya 38010, Guanajuato, Mexico; (A.L.-C.); (H.R.-M.); (G.-A.S.-M.); (L.G.-C.); (A.B.-N.)
| | - Wilson Huanca-Mamani
- Departamento de Producción Agrícola, Facultad de Ciencias Agronómicas, Universidad de Tarapacá, Arica 1000000, Chile;
| | - Víctor Montero-Tavera
- Biotechnology Department, National Institute for Forestry Agriculture and Livestock Research (INIFAP), Celaya 38110, Guanajuato, Mexico;
| | - Andrea Tovar-Aguilar
- Instituto Politécnico Nacional, Unidad Profesional Interdisciplinaria de Biotecnología, Av. Acueducto S/N., Col. Barrio La Laguna Ticomán, México City 07340, Mexico; (A.T.-A.); (N.-V.D.-F.)
| | | | - Noé-Valentín Durán-Figueroa
- Instituto Politécnico Nacional, Unidad Profesional Interdisciplinaria de Biotecnología, Av. Acueducto S/N., Col. Barrio La Laguna Ticomán, México City 07340, Mexico; (A.T.-A.); (N.-V.D.-F.)
| | - Gerardo Acosta-García
- Departamento de Ingeniería Bioquímica, Tecnológico Nacional de México/IT de Celaya, Antonio García Cubas Pte. #600 esq. Av. Tecnológico, Celaya 38010, Guanajuato, Mexico; (A.L.-C.); (H.R.-M.); (G.-A.S.-M.); (L.G.-C.); (A.B.-N.)
- Correspondence: ; Tel.: +52-4616117575 (ext. 5471)
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Kumar T, Tiwari N, Bharadwaj C, Sarker A, Pappula SPR, Singh S, Singh M. Identification of Allelic Variation in Drought Responsive Dehydrin Gene Based on Sequence Similarity in Chickpea ( Cicer arietinum L.). Front Genet 2021; 11:584527. [PMID: 33381148 PMCID: PMC7767992 DOI: 10.3389/fgene.2020.584527] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2020] [Accepted: 11/18/2020] [Indexed: 11/13/2022] Open
Abstract
Chickpea (Cicer arietinum L.) is an economically important food legume grown in arid and semi-arid regions of the world. Chickpea is cultivated mainly in the rainfed, residual moisture, and restricted irrigation condition. The crop is always prone to drought stress which is resulting in flower drop, unfilled pods, and is a major yield reducer in many parts of the world. The present study elucidates the association between candidate gene and morpho-physiological traits for the screening of drought tolerance in chickpea. Abiotic stress-responsive gene Dehydrin (DHN) was identified in some of the chickpea genotypes based on the sequence similarity approach to play a major role in drought tolerance. Analysis of variance revealed a significant effect of drought on relative water content, membrane stability index, plant height, and yield traits. The genotypes Pusa1103, Pusa362, and ICC4958 were found most promising genotypes for drought tolerance as they maintained the higher value of osmotic regulations and yield characters. The results were further supported by a sequence similarity approach for the dehydrin gene when analyzed for the presence of single nucleotide polymorphisms (SNPs) and indels. Homozygous indels and single nucleotide polymorphisms were found after the sequencing in some of the selected genotypes.
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Affiliation(s)
- Tapan Kumar
- Division of Genetics, ICAR-Indian Agricultural Research Institute, New Delhi, India.,International Center for Agricultural Research in the Dry Areas, Bhopal, India
| | - Neha Tiwari
- International Center for Agricultural Research in the Dry Areas, Bhopal, India
| | | | - Ashutosh Sarker
- International Center for Agricultural Research in the Dry Areas, Bhopal, India
| | | | - Sarvjeet Singh
- Department of Plant Breeding & Genetics, Punjab Agricultural University, Ludhiana, India
| | - Mohar Singh
- Department of Plant Breeding & Genetics, ICAR-NBPGR Regional Station, Shimla, India
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Characterization of AhLea-3 and its enhancement of salt tolerance in transgenic peanut plants. ELECTRON J BIOTECHN 2021. [DOI: 10.1016/j.ejbt.2020.10.006] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
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Hu T, Liu Y, Zhu S, Qin J, Li W, Zhou N. Overexpression of OsLea14-A improves the tolerance of rice and increases Hg accumulation under diverse stresses. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2019; 26:10537-10551. [PMID: 30762181 DOI: 10.1007/s11356-019-04464-z] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/11/2018] [Accepted: 02/03/2019] [Indexed: 04/16/2023]
Abstract
The group 5 LEA (late embryogenesis abundant) proteins are an atypical LEA protein group, which is associated with resistance to multiple stresses. In this study, OsLea14-A gene was isolated from Oryza sativa L., which encodes a 5C LEA protein with 151 amino acids. The qPCR analysis showed that OsLea14-A expressed in all tissues and organs at all times. The expression of OsLea14-A in the panicles of plumping stage were dramatically increased. The heterologous expression of OsLea14-A in Escherichia coli improved its growth performance under salinity, desiccation, high temperature, and freeze-thaw stresses. The purified OsLea14-A protein can protect LDH activity from freeze-thaw-, heat-, and desiccation-induced inactivation. The overexpression of OsLea14-A in rice improved tolerance to dehydration, high salinity, CuSO4, and HgCl2, but excluding K2Cr2O7. The analysis of metal contents showed that the accumulation of OsLea14-A protein in transgenic rice could increase the accumulation of Hg, but could not increase the accumulation of Na, Cr, and Cu after HgCl2, NaCl, K2Cr2O7, and CuSO4 treatment, respectively. These results suggested that OsLea14-A conferred multiple stress tolerance and Hg accumulation, which made it a possible gene in genetic improvement for plants to acclimatize itself to multiple stresses and remediate Hg-contaminated soil.
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Affiliation(s)
- Tingzhang Hu
- Key Laboratory for Biorheological Science and Technology of Ministry of Education, Bioengineering College of Chongqing University, No. 174, Shazheng Street, Shapingba District, Chongqing, 400030, People's Republic of China.
| | - Yuanli Liu
- Key Laboratory for Biorheological Science and Technology of Ministry of Education, Bioengineering College of Chongqing University, No. 174, Shazheng Street, Shapingba District, Chongqing, 400030, People's Republic of China
| | - Shanshan Zhu
- Key Laboratory for Biorheological Science and Technology of Ministry of Education, Bioengineering College of Chongqing University, No. 174, Shazheng Street, Shapingba District, Chongqing, 400030, People's Republic of China
| | - Juan Qin
- College of Food and Biological Engineering, Chongqing Three Gorges University, Chongqing, 404120, China
| | - Wenping Li
- Key Laboratory for Biorheological Science and Technology of Ministry of Education, Bioengineering College of Chongqing University, No. 174, Shazheng Street, Shapingba District, Chongqing, 400030, People's Republic of China
| | - Nong Zhou
- College of Food and Biological Engineering, Chongqing Three Gorges University, Chongqing, 404120, China
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Yang J, Zhao S, Zhao B, Li C. Overexpression of TaLEA3 induces rapid stomatal closure under drought stress in Phellodendron amurense Rupr. PLANT SCIENCE : AN INTERNATIONAL JOURNAL OF EXPERIMENTAL PLANT BIOLOGY 2018; 277:100-109. [PMID: 30466574 DOI: 10.1016/j.plantsci.2018.09.022] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/20/2018] [Revised: 09/21/2018] [Accepted: 09/26/2018] [Indexed: 05/23/2023]
Abstract
Late embryogenesis abundant (LEA) proteins participate in drought stress responses in plants. In the present study, the gene TaLEA3 from the drought-resistant plant Tamarix androssowii was transformed into Amur cork tree (Phellodendron amurense) via Agrobacterium tumefaciens to investigate the mechanism of stomatal closure in response to osmotic stress. Our results showed that P. amurense overexpressing TaLEA3 were resistant to drought stress by rapid stomatal closure. To study the stomatal movement regulated at the molecular level, a model system for stoma closure was established in in vitro P. amurense. In this work, we found that the increased Ca2+ accumulation in guard cells of transgenic plants caused stomatal closure and activated K+ efflux under polyethylene glycol (PEG) stress. Moreover, H+ changes might provide a needed pH condition for stomatal closure. Further, nitric oxide (NO) fluorescence was measured using an NO-specific fluorescent probe, diaminofluorescein-FM diacetate, which showed that guard cell NO fluorescence was stronger in transgenic plants compared with wild type plants. Additionally, five genes encoding nitrate reductase were up-regulated, indicating that TaLEA3 overexpression positively regulated NO biosynthesis and accumulation in the guard cells. This discovery will further our understanding of the LEA gene function and will help in engineering drought-resistant tree cultivars.
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Affiliation(s)
- Jingli Yang
- State Key Laboratory of Tree Genetics and Breeding, Northeast Forestry University, 26 Hexing Road, Harbin 150040, China
| | - Shicheng Zhao
- School of Phamacy, Harbin University of Commerce, Harbin 150076, China
| | - Bo Zhao
- State Key Laboratory of Tree Genetics and Breeding, Northeast Forestry University, 26 Hexing Road, Harbin 150040, China
| | - Chenghao Li
- State Key Laboratory of Tree Genetics and Breeding, Northeast Forestry University, 26 Hexing Road, Harbin 150040, China.
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Mining Late Embryogenesis Abundant (LEA) Family Genes in Cleistogenes songorica, a Xerophyte Perennial Desert Plant. Int J Mol Sci 2018; 19:ijms19113430. [PMID: 30388835 PMCID: PMC6274777 DOI: 10.3390/ijms19113430] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2018] [Revised: 10/11/2018] [Accepted: 10/23/2018] [Indexed: 11/17/2022] Open
Abstract
Plant growth and development depends on its ability to maintain optimal cellular homeostasis during abiotic and biotic stresses. Cleistogenes songorica, a xerophyte desert plant, is known to have novel drought stress adaptation strategies and contains rich pools of stress tolerance genes. Proteins encoded by Late Embryogenesis Abundant (LEA) family genes promote cellular activities by functioning as disordered molecules, or by limiting collisions between enzymes during stresses. To date, functions of the LEA family genes have been heavily investigated in many plant species except perennial monocotyledonous species. In this study, 44 putative LEA genes were identified in the C. songorica genome and were grouped into eight subfamilies, based on their conserved protein domains and domain organizations. Phylogenetic analyses indicated that C. songorica Dehydrin and LEA_2 subfamily proteins shared high sequence homology with stress responsive Dehydrin proteins from Arabidopsis. Additionally, promoter regions of CsLEA_2 or CsDehydrin subfamily genes were rich in G-box, drought responsive (MBS), and/or Abscisic acid responsive (ABRE) cis-regulatory elements. In addition, gene expression analyses indicated that genes from these two subfamilies were highly responsive to heat stress and ABA treatment, in both leaves and roots. In summary, the results from this study provided a comprehensive view of C. songoricaLEA genes and the potential applications of these genes for the improvement of crop tolerance to abiotic stresses.
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Wang Z, Yang Q, Shao Y, Zhang B, Feng A, Meng F, Li W. GmLEA2-1, a late embryogenesis abundant protein gene isolated from soybean (Glycine max (L.) Merr.), confers tolerance to abiotic stress. ACTA BIOLOGICA HUNGARICA 2018; 69:270-282. [PMID: 30257578 DOI: 10.1556/018.68.2018.3.4] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
Late embryonic proteins (LEA) gene family was abundant mainly in higher plant embryos, which could protect the embryos from the damage caused by abiotic stress, especially drought and salt stresses. In the present study, GmLEA2-1 was cloned from soybean leaf tissue treated by 10% polyethylene glycol 6000 (PEG6000). The results of quantitative real-time PCR (qRT-PCR) revealed a variety of expression patterns of GmLEA2-1 in various tissues of soybean (root, stem, leaf, flower, pod, early embryo and late embryo). GmLEA2-1 gene shared a lower sequence similarity with other typical LEA genes of same group from different species, but similar functions. Overexpression of GmLEA2-1 in transgenic Arabidopsis thaliana conferred tolerance to drought and salt stresses. The fresh weight and dry weight of seedling, the primary root length and the lateral root density of transgenic Arabidopsis plants were higher than those of wild type Arabidopsis (WT) under drought and salt stresses. Cis-acting regulatory elements in the GmLEA2-1 promoter were also predicted. These data demonstrate that GmLEA2-1 protein play an important role in improving drought and salt tolerance in plants.
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Affiliation(s)
- Zhikun Wang
- Key Laboratory of Soybean Biology in Chinese Ministry of Education/Key Laboratory of Biology and Genetics & Breeding for Soybean in Northeast China, Ministry of Agriculture ( Northeast Agricultural University ), Harbin , China
| | - Qiang Yang
- Key Laboratory of Soybean Biology in Chinese Ministry of Education/Key Laboratory of Biology and Genetics & Breeding for Soybean in Northeast China, Ministry of Agriculture ( Northeast Agricultural University ), Harbin , China
| | - Yupeng Shao
- Key Laboratory of Soybean Biology in Chinese Ministry of Education/Key Laboratory of Biology and Genetics & Breeding for Soybean in Northeast China, Ministry of Agriculture ( Northeast Agricultural University ), Harbin , China
| | - Binbin Zhang
- Key Laboratory of Soybean Biology in Chinese Ministry of Education/Key Laboratory of Biology and Genetics & Breeding for Soybean in Northeast China, Ministry of Agriculture ( Northeast Agricultural University ), Harbin , China
| | - Aiyun Feng
- Key Laboratory of Soybean Biology in Chinese Ministry of Education/Key Laboratory of Biology and Genetics & Breeding for Soybean in Northeast China, Ministry of Agriculture ( Northeast Agricultural University ), Harbin , China
| | - Fanli Meng
- Key Laboratory of Soybean Biology in Chinese Ministry of Education/Key Laboratory of Biology and Genetics & Breeding for Soybean in Northeast China, Ministry of Agriculture ( Northeast Agricultural University ), Harbin , China
| | - Wenbin Li
- Key Laboratory of Soybean Biology in Chinese Ministry of Education/Key Laboratory of Biology and Genetics & Breeding for Soybean in Northeast China, Ministry of Agriculture ( Northeast Agricultural University ), Harbin , China
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Huang Z, Zhong XJ, He J, Jin SH, Guo HD, Yu XF, Zhou YJ, Li X, Ma MD, Chen QB, Long H. Genome-Wide Identification, Characterization, and Stress-Responsive Expression Profiling of Genes Encoding LEA (Late Embryogenesis Abundant) Proteins in Moso Bamboo (Phyllostachys edulis). PLoS One 2016; 11:e0165953. [PMID: 27829056 PMCID: PMC5102402 DOI: 10.1371/journal.pone.0165953] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2016] [Accepted: 10/20/2016] [Indexed: 01/10/2023] Open
Abstract
Late embryogenesis abundant (LEA) proteins have been identified in a wide range of organisms and are believed to play a role in the adaptation of plants to stress conditions. In this study, we performed genome-wide identification of LEA proteins and their coding genes in Moso bamboo (Phyllostachys edulis) of Poaceae. A total of 23 genes encoding LEA proteins (PeLEAs) were found in P. edulis that could be classified to six groups based on Pfam protein family and homologous analysis. Further in silico analyses of the structures, gene amount, and biochemical characteristics were conducted and compared with those of O. sativa (OsLEAs), B. distachyon (BdLEAs), Z. mays (ZmLEAs), S. bicolor (SbLEAs), Arabidopsis, and Populus trichocarpa. The less number of PeLEAs was found. Evolutionary analysis revealed orthologous relationship and colinearity between P. edulis, O. sativa, B. distachyon, Z. mays, and S. bicolor. Analyses of the non-synonymous (Ka) and synonymous (Ks)substitution rates and their ratios indicated that the duplication of PeLEAs may have occurred around 18.8 million years ago (MYA), and divergence time of LEA family among the P. edulis-O. sativa and P. edulis–B. distachyon, P. edulis-S. bicolor, and P. edulis-Z. mays was approximately 30 MYA, 36 MYA, 48 MYA, and 53 MYA, respectively. Almost all PeLEAs contain ABA- and (or) stress-responsive regulatory elements. Further RNA-seq analysis revealed approximately 78% of PeLEAs could be up-regulated by dehydration and cold stresses. The present study makes insights into the LEA family in P. edulis and provides inventory of stress-responsive genes for further functional validation and transgenic research aiming to plant genetic improvement of abiotic stress tolerance.
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Affiliation(s)
- Zhuo Huang
- College of Landscape Architecture, Sichuan Agricultural University, 211 Huimin Road, Wenjiang, Chengdu 611130, Sichuan, China
- * E-mail: (ZH); (HL)
| | - Xiao-Juan Zhong
- College of Landscape Architecture, Sichuan Agricultural University, 211 Huimin Road, Wenjiang, Chengdu 611130, Sichuan, China
| | - Jiao He
- College of Landscape Architecture, Sichuan Agricultural University, 211 Huimin Road, Wenjiang, Chengdu 611130, Sichuan, China
| | - Si-Han Jin
- College of Landscape Architecture, Sichuan Agricultural University, 211 Huimin Road, Wenjiang, Chengdu 611130, Sichuan, China
| | - Han-Du Guo
- College of Landscape Architecture, Sichuan Agricultural University, 211 Huimin Road, Wenjiang, Chengdu 611130, Sichuan, China
| | - Xiao-Fang Yu
- College of Landscape Architecture, Sichuan Agricultural University, 211 Huimin Road, Wenjiang, Chengdu 611130, Sichuan, China
| | - Yu-Jue Zhou
- College of Landscape Architecture, Sichuan Agricultural University, 211 Huimin Road, Wenjiang, Chengdu 611130, Sichuan, China
| | - Xi Li
- College of Landscape Architecture, Sichuan Agricultural University, 211 Huimin Road, Wenjiang, Chengdu 611130, Sichuan, China
| | - Ming-Dong Ma
- College of Landscape Architecture, Sichuan Agricultural University, 211 Huimin Road, Wenjiang, Chengdu 611130, Sichuan, China
| | - Qi-Bing Chen
- College of Landscape Architecture, Sichuan Agricultural University, 211 Huimin Road, Wenjiang, Chengdu 611130, Sichuan, China
| | - Hai Long
- Chengdu Institute of Biology, Chinese Academy of Sciences, Chengdu 610041, Sichuan, China
- * E-mail: (ZH); (HL)
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Sharma A, Kumar D, Kumar S, Rampuria S, Reddy AR, Kirti PB. Ectopic Expression of an Atypical Hydrophobic Group 5 LEA Protein from Wild Peanut, Arachis diogoi Confers Abiotic Stress Tolerance in Tobacco. PLoS One 2016; 11:e0150609. [PMID: 26938884 PMCID: PMC4777422 DOI: 10.1371/journal.pone.0150609] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/08/2015] [Accepted: 02/16/2016] [Indexed: 11/23/2022] Open
Abstract
Late embryogenesis abundant (LEA) proteins are a group of hydrophilic proteins, which accumulate in plants under varied stress conditions like drought, salinity, extreme temperatures and oxidative stress suggesting their role in the protection of plants against these stresses. A transcript derived fragment (TDF) corresponding to LEA gene, which got differentially expressed in wild peanut, Arachis diogoi against the late leaf spot pathogen, Phaeoisariopsis personata was used in this study. We have cloned its full length cDNA by RACE-PCR, which was designated as AdLEA. AdLEA belongs to the atypical Group 5C of LEA protein family as confirmed by sequence analysis. Group 5C LEA protein subfamily contains Pfam LEA_2 domain and is highly hydrophobic. In native conditions, expression of AdLEA was upregulated considerably upon hormonal and abiotic stress treatments emphasizing its role in abiotic stress tolerance. Subcellular localization studies showed that AdLEA protein is distributed in both nucleus and cytosol. Ectopic expression of AdLEA in tobacco resulted in enhanced tolerance of plants to dehydration, salinity and oxidative stress with the transgenic plants showing higher chlorophyll content and reduced lipid peroxidation as compared to wild type plants. Overexpressed AdLEA tobacco plants maintained better photosynthetic efficiency under drought conditions as demonstrated by chlorophyll fluorescence measurements. These plants showed enhanced transcript accumulation of some stress-responsive genes. Our study also elucidates that ROS levels were significantly reduced in leaves and stomatal guard cells of transgenic plants upon stress treatments. These results suggest that AdLEA confers multiple stress tolerance to plants, which make it a potential gene for genetic modification in plants.
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Affiliation(s)
- Akanksha Sharma
- Department of Plant Sciences, University of Hyderabad, Hyderabad, 500046, India
| | - Dilip Kumar
- Department of Plant Sciences, University of Hyderabad, Hyderabad, 500046, India
- Department of Postharvest Science of Fresh Produce, ARO, The Volcani Center, Bet Dagan, 50250, Israel
| | - Sumit Kumar
- Department of Plant Sciences, University of Hyderabad, Hyderabad, 500046, India
| | - Sakshi Rampuria
- Department of Plant Sciences, University of Hyderabad, Hyderabad, 500046, India
| | - Attipalli R. Reddy
- Department of Plant Sciences, University of Hyderabad, Hyderabad, 500046, India
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Pedrosa AM, Martins CDPS, Gonçalves LP, Costa MGC. Late Embryogenesis Abundant (LEA) Constitutes a Large and Diverse Family of Proteins Involved in Development and Abiotic Stress Responses in Sweet Orange (Citrus sinensis L. Osb.). PLoS One 2015; 10:e0145785. [PMID: 26700652 PMCID: PMC4689376 DOI: 10.1371/journal.pone.0145785] [Citation(s) in RCA: 71] [Impact Index Per Article: 7.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2015] [Accepted: 12/08/2015] [Indexed: 11/18/2022] Open
Abstract
Late Embryogenesis Abundant (LEA) proteins are an ubiquitous group of polypeptides that were first described to accumulate during plant seed dehydration, at the later stages of embryogenesis. Since then they have also been recorded in vegetative plant tissues experiencing water limitation and in anhydrobiotic bacteria and invertebrates and, thereby, correlated with the acquisition of desiccation tolerance. This study provides the first comprehensive study about the LEA gene family in sweet orange (Citrus sinensis L. Osb.), the most important and widely grown fruit crop around the world. A surprisingly high number (72) of genes encoding C. sinensis LEAs (CsLEAs) were identified and classified into seven groups (LEA_1, LEA_2, LEA_3 and LEA_4, LEA_5, DEHYDRIN and SMP) based on their predicted amino acid sequences and also on their phylogenetic relationships with the complete set of Arabidopsis thaliana LEA proteins (AtLEAs). Approximately 60% of the CsLEAs identified in this study belongs to the unusual LEA_2 group of more hydrophobic LEA proteins, while the other LEA groups contained a relatively small number of members typically hydrophilic. A correlation between gene structure and motif composition was observed within each LEA group. Investigation of their chromosomal localizations revealed that the CsLEAs were non-randomly distributed across all nine chromosomes and that 33% of all CsLEAs are segmentally or tandemly duplicated genes. Analysis of the upstream sequences required for transcription revealed the presence of various stress-responsive cis-acting regulatory elements in the promoter regions of CsLEAs, including ABRE, DRE/CRT, MYBS and LTRE. Expression analysis using both RNA-seq data and quantitative real-time RT-PCR (qPCR) revealed that the CsLEA genes are widely expressed in various tissues, and that many genes containing the ABRE promoter sequence are induced by drought, salt and PEG. These results provide a useful reference for further exploration of the CsLEAs functions and applications on crop improvement.
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Affiliation(s)
- Andresa Muniz Pedrosa
- Centro de Biotecnologia e Genética, Departamento de Ciências Biológicas, Universidade Estadual de Santa Cruz, Ilhéus, BA, Brazil
| | - Cristina de Paula Santos Martins
- Centro de Biotecnologia e Genética, Departamento de Ciências Biológicas, Universidade Estadual de Santa Cruz, Ilhéus, BA, Brazil
| | - Luana Pereira Gonçalves
- Centro de Biotecnologia e Genética, Departamento de Ciências Biológicas, Universidade Estadual de Santa Cruz, Ilhéus, BA, Brazil
| | - Marcio Gilberto Cardoso Costa
- Centro de Biotecnologia e Genética, Departamento de Ciências Biológicas, Universidade Estadual de Santa Cruz, Ilhéus, BA, Brazil
- * E-mail:
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CpLEA5, the Late Embryogenesis Abundant Protein Gene from Chimonanthus praecox, Possesses Low Temperature and Osmotic Resistances in Prokaryote and Eukaryotes. Int J Mol Sci 2015; 16:26978-90. [PMID: 26569231 PMCID: PMC4661864 DOI: 10.3390/ijms161126006] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2015] [Revised: 11/01/2015] [Accepted: 11/05/2015] [Indexed: 01/30/2023] Open
Abstract
Plants synthesize and accumulate a series of stress-resistance proteins to protect normal physiological activities under adverse conditions. Chimonanthus praecox which blooms in freezing weather accumulates late embryogenesis abundant proteins (LEAs) in flowers, but C. praecox LEAs are little reported. Here, we report a group of five LEA genes of C. praecox (CpLEA5, KT727031). Prokaryotic-expressed CpLEA5 was employed in Escherichia coli to investigate bioactivities and membrane permeability at low-temperature. In comparison with the vacant strains, CpLEA5-containing strains survived in a 20% higher rate; and the degree of cell membrane damage in CpLEA5-containing strains was 55% of that of the vacant strains according to a conductivity test, revealing the low-temperature resistance of CpLEA5 in bacteria. CpLEA5 was also expressed in Pichia pastoris. Interestingly, besides low-temperature resistance, CpLEA5 conferred high resistance to salt and alkali in CpLEA5 overexpressing yeast. The CpLEA5 gene was transferred into Arabidopsis thaliana to also demonstrate CpLEA5 actions in plants. As expected, the transgenic lines were more resistant against low-temperature and drought while compared with the wild type. Taken together, CpLEA5-conferred resistances to several conditions in prokaryote and eukaryotes could have great value as a genetic technology to enhance osmotic stress and low-temperature tolerance.
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Lim CW, Lim S, Baek W, Lee SC. The pepper late embryogenesis abundant protein CaLEA1 acts in regulating abscisic acid signaling, drought and salt stress response. PHYSIOLOGIA PLANTARUM 2015; 154:526-42. [PMID: 25302464 DOI: 10.1111/ppl.12298] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/07/2014] [Revised: 09/11/2014] [Accepted: 09/26/2014] [Indexed: 05/08/2023]
Abstract
As sessile organisms, plants are constantly challenged by environmental stresses, including drought and high salinity. Among the various abiotic stresses, osmotic stress is one of the most important factors for growth and significantly reduces crop productivity in agriculture. Here, we report a function of the CaLEA1 protein in the defense responses of plants to osmotic stress. Our analyses showed that the CaLEA1 gene was strongly induced in pepper leaves exposed to drought and increased salinity. Furthermore, we determined that the CaLEA1 protein has a late embryogenesis abundant (LEA)_3 homolog domain highly conserved among other known group 5 LEA proteins and is localized in the processing body. We generated CaLEA1-silenced peppers and CaLEA1-overexpressing (OX) transgenic Arabidopsis plants to evaluate their responses to dehydration and high salinity. Virus-induced gene silencing of CaLEA1 in pepper plants conferred enhanced sensitivity to drought and salt stresses, which was accompanied by high levels of lipid peroxidation in dehydrated and NaCl-treated leaves. CaLEA1-OX plants exhibited enhanced sensitivity to abscisic acid (ABA) during seed germination and in the seedling stage; furthermore, these plants were more tolerant to drought and salt stress than the wild-type plants because of enhanced stomatal closure and increased expression of stress-responsive genes. Collectively, our data suggest that CaLEA1 positively regulates drought and salinity tolerance through ABA-mediated cell signaling.
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Affiliation(s)
- Chae Woo Lim
- Department of Life Science (BK21 Program), Chung-Ang University, Seoul, 156-756, Republic of Korea
| | - Sohee Lim
- Department of Life Science (BK21 Program), Chung-Ang University, Seoul, 156-756, Republic of Korea
| | - Woonhee Baek
- Department of Life Science (BK21 Program), Chung-Ang University, Seoul, 156-756, Republic of Korea
| | - Sung Chul Lee
- Department of Life Science (BK21 Program), Chung-Ang University, Seoul, 156-756, Republic of Korea
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Wang M, Li P, Li C, Pan Y, Jiang X, Zhu D, Zhao Q, Yu J. SiLEA14, a novel atypical LEA protein, confers abiotic stress resistance in foxtail millet. BMC PLANT BIOLOGY 2014; 14:290. [PMID: 25404037 PMCID: PMC4243736 DOI: 10.1186/s12870-014-0290-7] [Citation(s) in RCA: 59] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/30/2014] [Accepted: 10/15/2014] [Indexed: 05/05/2023]
Abstract
BACKGROUND Late embryogenesis abundant (LEA) proteins are involved in protecting higher plants from damage caused by environmental stresses. Foxtail millet (Setaria italica) is an important cereal crop for food and feed in semi-arid areas. However, the molecular mechanisms underlying tolerance to these conditions are not well defined. RESULTS Here, we characterized a novel atypical LEA gene named SiLEA14 from foxtail millet. It contains two exons separated by one intron. SiLEA14 was expressed in roots, stems, leaves, inflorescences and seeds at different levels under normal growth conditions. In addition, SiLEA14 was dramatically induced by osmotic stress, NaCl and exogenous abscisic acid. The SiLEA14 protein was localized in the nucleus and the cytoplasm. Overexpression of SiLEA14 improved Escherichia coli growth performance compared with the control under salt stress. To further assess the function of SiLEA14 in plants, transgenic Arabidopsis and foxtail millet plants that overexpressed SiLEA14 were obtained. The transgenic Arabidopsis seedlings showed higher tolerance to salt and osmotic stress than the wild type (WT). Similarly, the transgenic foxtail millet showed improved growth under salt and drought stresses compared with the WT. Taken together, our results indicated that SiLEA14 is a novel atypical LEA protein and plays important roles in resistance to abiotic stresses in plants. CONCLUSION We characterized a novel atypical LEA gene SiLEA14 from foxtail millet, which plays important roles in plant abiotic stress resistance. Modification of SiLEA14 expression may improve abiotic stress resistance in agricultural crops.
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Affiliation(s)
- Meizhen Wang
- />State Key Laboratory of Agrobiotechnology, College of Biological Sciences, China Agricultural University, No. 2 Yuanmingyuan West Road, Haidian District, Beijing, 100193 China
- />Institute of Medicinal Plant Development, Chinese Academy of Medical Sciences & Peking Union Medical College, No. 151, Malianwa North Road, Haidian District, Beijing, 100193 China
| | - Ping Li
- />State Key Laboratory of Agrobiotechnology, College of Biological Sciences, China Agricultural University, No. 2 Yuanmingyuan West Road, Haidian District, Beijing, 100193 China
| | - Cong Li
- />State Key Laboratory of Agrobiotechnology, College of Biological Sciences, China Agricultural University, No. 2 Yuanmingyuan West Road, Haidian District, Beijing, 100193 China
| | - Yanlin Pan
- />State Key Laboratory of Agrobiotechnology, College of Biological Sciences, China Agricultural University, No. 2 Yuanmingyuan West Road, Haidian District, Beijing, 100193 China
| | - Xiyuan Jiang
- />State Key Laboratory of Agrobiotechnology, College of Biological Sciences, China Agricultural University, No. 2 Yuanmingyuan West Road, Haidian District, Beijing, 100193 China
| | - Dengyun Zhu
- />State Key Laboratory of Agrobiotechnology, College of Biological Sciences, China Agricultural University, No. 2 Yuanmingyuan West Road, Haidian District, Beijing, 100193 China
| | - Qian Zhao
- />State Key Laboratory of Agrobiotechnology, College of Biological Sciences, China Agricultural University, No. 2 Yuanmingyuan West Road, Haidian District, Beijing, 100193 China
| | - Jingjuan Yu
- />State Key Laboratory of Agrobiotechnology, College of Biological Sciences, China Agricultural University, No. 2 Yuanmingyuan West Road, Haidian District, Beijing, 100193 China
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Jia F, Qi S, Li H, Liu P, Li P, Wu C, Zheng C, Huang J. Overexpression of Late Embryogenesis Abundant 14 enhances Arabidopsis salt stress tolerance. Biochem Biophys Res Commun 2014; 454:505-11. [PMID: 25450686 DOI: 10.1016/j.bbrc.2014.10.136] [Citation(s) in RCA: 49] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2014] [Accepted: 10/20/2014] [Indexed: 10/24/2022]
Abstract
Late embryogenesis abundant (LEA) proteins are implicated in various abiotic stresses in higher plants. In this study, we identified a LEA protein from Arabidopsis thaliana, AtLEA14, which was ubiquitously expressed in different tissues and remarkably induced with increased duration of salt treatment. Subcellular distribution analysis demonstrated that AtLEA14 was mainly localized in the cytoplasm. Transgenic Arabidopsis and yeast overexpressing AtLEA14 all exhibited enhanced tolerance to high salinity. The transcripts of salt stress-responsive marker genes (COR15a, KIN1, RD29B and ERD10) were overactivated in AtLEA14 overexpressing lines compared with those in wild type plants under normal or salt stress conditions. In vivo and in vitro analysis showed that AtLEA14 could effectively stabilize AtPP2-B11, an important E3 ligase. These results suggested that AtLEA14 had important protective functions under salt stress conditions in Arabidopsis.
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Affiliation(s)
- Fengjuan Jia
- State Key Laboratory of Crop Biology, College of Life Sciences, Shandong Agricultural University, Taian, Shandong 271018, PR China.
| | - Shengdong Qi
- State Key Laboratory of Crop Biology, College of Life Sciences, Shandong Agricultural University, Taian, Shandong 271018, PR China.
| | - Hui Li
- State Key Laboratory of Crop Biology, College of Life Sciences, Shandong Agricultural University, Taian, Shandong 271018, PR China.
| | - Pu Liu
- State Key Laboratory of Crop Biology, College of Life Sciences, Shandong Agricultural University, Taian, Shandong 271018, PR China.
| | - Pengcheng Li
- State Key Laboratory of Crop Biology, College of Life Sciences, Shandong Agricultural University, Taian, Shandong 271018, PR China.
| | - Changai Wu
- State Key Laboratory of Crop Biology, College of Life Sciences, Shandong Agricultural University, Taian, Shandong 271018, PR China.
| | - Chengchao Zheng
- State Key Laboratory of Crop Biology, College of Life Sciences, Shandong Agricultural University, Taian, Shandong 271018, PR China.
| | - Jinguang Huang
- State Key Laboratory of Crop Biology, College of Life Sciences, Shandong Agricultural University, Taian, Shandong 271018, PR China.
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Liu Y, Wang L, Jiang S, Pan J, Cai G, Li D. Group 5 LEA protein, ZmLEA5C, enhance tolerance to osmotic and low temperature stresses in transgenic tobacco and yeast. PLANT PHYSIOLOGY AND BIOCHEMISTRY : PPB 2014; 84:22-31. [PMID: 25240107 DOI: 10.1016/j.plaphy.2014.08.016] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/24/2014] [Accepted: 08/18/2014] [Indexed: 05/08/2023]
Abstract
Group 5 LEA (Late Embryogenesis Abundant) proteins contain a significantly higher proportion of hydrophobic residues but lack significant signature motifs or consensus sequences. This group is considered as an atypical group of LEA proteins. Up to now, there is little known about group 5C LEA proteins in maize. Here, we identified a novel group 5C LEA protein from maize. The accumulation of transcripts demonstrated that ZmLEA5C displayed similar induced characteristics in leaves and roots. Transcription of ZmLEA5C could be induced by low temperature, osmotic and oxidative stress and some signaling molecules, such as abscisic acid (ABA), salicylic acid (SA) and methyl jasmonate (MeJA). However, transcription of ZmLEA5C was significantly inhibited by high salinity. Further study indicated that the ZmLEA5C protein could be phosphorylated by the protein kinase CKII. ZmLEA5C could protect the activity of LDH under water deficit and low temperature stresses. Overexpression of ZmLEA5C conferred to transgenic tobacco (Nicotiana benthamiana) and yeast (GS115) tolerance to osmotic and low temperature stresses.
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Affiliation(s)
- Yang Liu
- State Key Laboratory of Crop Biology, Shandong Key Laboratory of Crop Biology, College of Life Sciences, Shandong Agricultural University, Tai'an, Shandong 271018, China
| | - Li Wang
- State Key Laboratory of Crop Biology, Shandong Key Laboratory of Crop Biology, College of Life Sciences, Shandong Agricultural University, Tai'an, Shandong 271018, China
| | - Shanshan Jiang
- State Key Laboratory of Crop Biology, Shandong Key Laboratory of Crop Biology, College of Life Sciences, Shandong Agricultural University, Tai'an, Shandong 271018, China
| | - Jiaowen Pan
- State Key Laboratory of Crop Biology, Shandong Key Laboratory of Crop Biology, College of Life Sciences, Shandong Agricultural University, Tai'an, Shandong 271018, China
| | - Guohua Cai
- State Key Laboratory of Crop Biology, Shandong Key Laboratory of Crop Biology, College of Life Sciences, Shandong Agricultural University, Tai'an, Shandong 271018, China
| | - Dequan Li
- State Key Laboratory of Crop Biology, Shandong Key Laboratory of Crop Biology, College of Life Sciences, Shandong Agricultural University, Tai'an, Shandong 271018, China.
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Wu Y, Liu C, Kuang J, Ge Q, Zhang Y, Wang Z. Overexpression of SmLEA enhances salt and drought tolerance in Escherichia coli and Salvia miltiorrhiza. PROTOPLASMA 2014; 251:1191-9. [PMID: 24595620 DOI: 10.1007/s00709-014-0626-z] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/15/2013] [Accepted: 02/13/2014] [Indexed: 05/10/2023]
Abstract
Salinity and drought are important abiotic stresses limiting plant growth and development. Late embryogenesis abundant (LEA) proteins are a group of proteins associated with tolerance to water-related stress. We previously cloned an LEA gene, SmLEA, from Salvia miltiorrhiza Bunge. Phylogenetic analysis indicated that SmLEA belongs to Group LEA14, which is involved in the dehydration response. To determine its function in detail, we have now overexpressed SmLEA in Escherichia coli and S. miltiorrhiza. The logarithmic increase in accumulations of SmLEA proteins in E. coli occurred earlier under salinity than under standard conditions. SmLEA-transformed S. miltiorrhiza plants also showed faster root elongation and a lower malondialdehyde concentration than the empty vector control plants did when cultured on MS media supplemented with 60 mM NaCl or 150 mM mannitol. Moreover, SmLEA-overexpressing transgenics experienced a less rapid rate of water loss. Under either salinity or drought, overexpressing plants had greater superoxide dismutase activity and a higher glutathione concentration. These results suggest that SmLEA may be useful in efforts to improve drought and salinity tolerance in S. miltiorrhiza. Our data also provide a good foundation for further studies into the stress resistance mechanism and molecular breeding of this valuable medicinal plant.
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Affiliation(s)
- Yucui Wu
- Key Laboratory of Medicinal Resource and Natural Pharmaceutical Chemistry of Ministry of Education, National Engineering Laboratory for Resource Developing of Endangered Chinese Crude Drug in Northwest of China, Shaanxi Normal University, Xi'an, 710062, People's Republic of China
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Dang NX, Popova AV, Hundertmark M, Hincha DK. Functional characterization of selected LEA proteins from Arabidopsis thaliana in yeast and in vitro. PLANTA 2014; 240:325-36. [PMID: 24841476 DOI: 10.1007/s00425-014-2089-z] [Citation(s) in RCA: 45] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/28/2014] [Accepted: 04/25/2014] [Indexed: 05/10/2023]
Abstract
Expression of eight LEA genes enhanced desiccation tolerance in yeast, including two LEA_2 genes encoding atypical, stably folded proteins. The recombinant proteins showed enzyme, but not membrane protection during drying. To screen for possible functions of late embryogenesis abundant (LEA) proteins in cellular stress tolerance, 15 candidate genes from six Arabidopsis thaliana LEA protein families were expressed in Saccharomyces cerevisiae as a genetically amenable eukaryotic model organism. Desiccation stress experiments showed that eight of the 15 LEA proteins significantly enhanced yeast survival. While none of the proteins belonging to the LEA_1, LEA_5 or AtM families provided protection to yeast cells, two of three LEA_2 proteins, all three LEA_4 proteins and three of four dehydrins were effective. However, no significantly enhanced tolerance toward freezing, salt, osmotic or oxidative stress was observed. While most LEA proteins are highly hydrophilic and intrinsically disordered, LEA_2 proteins are "atypical", since they are more hydrophobic and possess a stable folded structure in solution. Because nothing was known about the functional properties of LEA_2 proteins, we expressed the three Arabidopsis proteins LEA1, LEA26 and LEA27 in Escherichia coli. The bacteria expressed all three proteins in inclusion bodies from which they could be purified and refolded. Correct folding was ascertained by Fourier transform Infrared (FTIR) spectroscopy. None of the proteins was able to stabilize liposomes during freezing or drying, but they were all able to protect the enzyme lactate dehydrogenase (LDH) from inactivation during freezing. Significantly, only LEA1 and LEA27, which also protected yeast cells during drying, were able to stabilize LDH during desiccation and subsequent rehydration.
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Affiliation(s)
- Nghiem X Dang
- Max-Planck-Institute of Molecular Plant Physiology, Am Mühlenberg 1, 14476, Potsdam, Germany
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Paul A, Singh S, Sharma S, Kumar S. A stress-responsive late embryogenesis abundant protein 7 (CsLEA7) of tea [Camellia sinensis (L.) O. Kuntze] encodes for a chaperone that imparts tolerance to Escherichia coli against stresses. Mol Biol Rep 2014; 41:7191-200. [PMID: 25052187 DOI: 10.1007/s11033-014-3602-y] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2014] [Accepted: 07/07/2014] [Indexed: 11/26/2022]
Abstract
The present study characterized CsLEA7, a group 7 late embryogenesis abundant (LEA) gene, from tea [Camellia sinensis (L.) O. Kuntze]. The gene had an open reading frame of 462 base pairs encoding 153 amino acids with calculated molecular weight of 16.63 kDa and an isoelectric point (pI) of 4.93. Analysis revealed CsLEA7 to be an intrinsically ordered protein consisting of nine β-strands and two α-helices. CsLEA7 expressed ubiquitously in all the tissues analyzed with highest level of transcripts in mature leaf as compared to in flower bud, younger leaves, stem and fruit. Expression was the least in root tissue. CsLEA7 exhibited up-regulation in response to low temperature, polyethylene glycol-8000, sodium chloride and hydrogen peroxide in tea. Analysis of the promoter of CsLEA7 revealed a core promoter element and distinct cis-acting regulatory elements regulating gene expression under abiotic stresses. CsLEA7 exhibited chaperonic activity as evinced by protection to malate dehydrogenase against heat denaturation assay. Recombinant Escherichia coli cells producing CsLEA7 exhibited improved tolerance against diverse cues: polyethylene glycol-8000, sodium chloride, hydrogen peroxide and low temperature signifying its role in imparting stress tolerance.
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Affiliation(s)
- Asosii Paul
- Biotechnology Division, CSIR-Institute of Himalayan Bioresource Technology, Palampur, Himachal Pradesh, 176061, India
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Staszak AM, Pawłowski TA. Proteomic analysis of embryogenesis and the acquisition of seed dormancy in Norway maple (Acer platanoides L.). Int J Mol Sci 2014; 15:10868-91. [PMID: 24941250 PMCID: PMC4100186 DOI: 10.3390/ijms150610868] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/24/2014] [Revised: 05/16/2014] [Accepted: 05/30/2014] [Indexed: 12/16/2022] Open
Abstract
The proteome of zygotic embryos of Acer platanoides L. was analyzed via high-resolution 2D-SDS-PAGE and MS/MS in order to: (1) identify significant physiological processes associated with embryo development; and (2) identify changes in the proteome of the embryo associated with the acquisition of seed dormancy. Seventeen spots were identified as associated with morphogenesis at 10 to 13 weeks after flowering (WAF). Thirty-three spots were associated with maturation of the embryo at 14 to 22 WAF. The greatest changes in protein abundance occurred at 22 WAF, when seeds become fully mature. Overall, the stage of morphogenesis was characterized by changes in the abundance of proteins (tubulins and actin) associated with the growth and development of the embryo. Enzymes related to energy supply were especially elevated, most likely due to the energy demand associated with rapid growth and cell division. The stage of maturation is crucial to the establishment of seed dormancy and is associated with a higher abundance of proteins involved in genetic information processing, energy and carbon metabolism and cellular and antioxidant processes. Results indicated that a glycine-rich RNA-binding protein and proteasome proteins may be directly involved in dormancy acquisition control, and future studies are warranted to verify this association.
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JcLEA, a novel LEA-like protein from Jatropha curcas, confers a high level of tolerance to dehydration and salinity in Arabidopsis thaliana. PLoS One 2013; 8:e83056. [PMID: 24391737 PMCID: PMC3877014 DOI: 10.1371/journal.pone.0083056] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2013] [Accepted: 10/30/2013] [Indexed: 12/20/2022] Open
Abstract
Jatropha curcas L. is a highly drought and salt tolerant plant species that is typically used as a traditional folk medicine and biofuel crop in many countries. Understanding the molecular mechanisms that underlie the response to various abiotic environmental stimuli, especially to drought and salt stresses, in J. curcas could be important to crop improvement efforts. In this study, we cloned and characterized the gene for a late embryogenesis abundant (LEA) protein from J. curcas that we designated JcLEA. Sequence analyses showed that the JcLEA protein belongs to group 5, a subgroup of the LEA protein family. In young seedlings, expression of JcLEA is significantly induced by abscisic acid (ABA), dehydration, and salt stress. Subcellular localization analysis shows that that JcLEA protein is distributed in both the nucleus and cytoplasm. Moreover, based on growth status and physiological indices, the overexpression of JcLEA in transgenic Arabidopsis plants conferred increased resistance to both drought and salt stresses compared to the WT. Our data suggests that the group 5 JcLEA protein contributes to drought and salt stress tolerance in plants. Thus, JcLEA is a potential candidate gene for plant genetic modification.
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Jin X, Fu Z, Ding D, Li W, Liu Z, Tang J. Proteomic identification of genes associated with maize grain-filling rate. PLoS One 2013; 8:e59353. [PMID: 23527170 PMCID: PMC3601958 DOI: 10.1371/journal.pone.0059353] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2012] [Accepted: 02/13/2013] [Indexed: 11/18/2022] Open
Abstract
Grain filling during the linear phase contributes most of the dry matter accumulated in the maize kernel, which in turn determines the final grain yield. Endosperms and embryos of three elite maize hybrids (Zhengdan 958, Nongda 108, and Pioneer 335) were sampled 17, 22, 25, and 28 days after pollination, during the linear phase of grain filling, for proteomic analysis to explore the regulatory factors critical for grain filling rate. In total, 39 and 43 protein spots that showed more than 2-fold changes in abundance at P<0.01 between any two sampling stages in the endosperm and embryo were analyzed by protein mass spectrometry. The changing patterns in expression index of these proteins in the endosperm were evenly distributed, whereas up-regulation patterns predominated (74%) in the embryo. Functional analysis revealed that metabolism was the largest category, represented by nine proteins in the endosperm and 12 proteins in the embryo, of the proteins that significantly changed in abundance. Glycolysis, a critical process both for glucose conversion into pyruvate and for release of free energy and reducing power, and proteins related to redox homeostasis were emphasized in the endosperm. Additionally, lipid, nitrogen, and inositol metabolism related to fatty acid biosynthesis and late embryogenesis abundant proteins were emphasized in the embryo. One protein related to cellular redox equilibrium, which showed a more than 50-fold change in abundance and was co-localized with a quantitative trait locus for grain yield on chromosome 1, was further investigated by transcriptional profile implying consistent expression pattern with protein accumulation. The present results provide a first step towards elucidation of the gene network responsible for regulation of grain filling in maize.
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Affiliation(s)
- Xining Jin
- College of Agronomy, Key Laboratory of Physiological Ecology and Genetic Improvement of Food Crops in Henan Province, Henan Agricultural University, Zhengzhou, China
| | - Zhiyuan Fu
- College of Agronomy, Key Laboratory of Physiological Ecology and Genetic Improvement of Food Crops in Henan Province, Henan Agricultural University, Zhengzhou, China
| | - Dong Ding
- College of Agronomy, Key Laboratory of Physiological Ecology and Genetic Improvement of Food Crops in Henan Province, Henan Agricultural University, Zhengzhou, China
| | - Weihua Li
- College of Agronomy, Key Laboratory of Physiological Ecology and Genetic Improvement of Food Crops in Henan Province, Henan Agricultural University, Zhengzhou, China
| | - Zonghua Liu
- College of Agronomy, Key Laboratory of Physiological Ecology and Genetic Improvement of Food Crops in Henan Province, Henan Agricultural University, Zhengzhou, China
| | - Jihua Tang
- College of Agronomy, Key Laboratory of Physiological Ecology and Genetic Improvement of Food Crops in Henan Province, Henan Agricultural University, Zhengzhou, China
- * E-mail:
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Bhardwaj PK, Kapoor R, Mala D, Bhagwat G, Acharya V, Singh AK, Vats SK, Ahuja PS, Kumar S. Braving the attitude of altitude: Caragana jubata at work in cold desert of Himalaya. Sci Rep 2013; 3:1022. [PMID: 23289064 PMCID: PMC3535672 DOI: 10.1038/srep01022] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2012] [Accepted: 11/23/2012] [Indexed: 11/09/2022] Open
Abstract
The present work was conducted to understand the basis of adaptation in Caragana jubata in its niche environment at high altitude cold desert of Himalaya. Molecular data showed predominance of genes encoding chaperones and those involved in growth and development at low temperature (LT), a major cue operative at high altitude. Importantly, these genes expressed in C. jubata in its natural habitat. Their homologues in Arabidopsis thaliana, Oryza sativa, and Glycine max did not exhibit similar trend of gene expression at LT. Constitutive expression and a quick up-regulation of the above genes suggested the ability of C. jubata to adjust its cellular machinery to maintain growth and development in its niche. This was reflected in LT50 (the temperature at which 50% injury occurred) and LT mediated photosynthetic acclimatory response. Such molecular and physiological plasticity enables C. jubata to thrive in the high altitude cold desert of Himalayas.
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Affiliation(s)
- Pardeep Kumar Bhardwaj
- Biotechnology Division, CSIR-Institute of Himalayan Bioresource Technology, Council of Scientific and Industrial Research, P.O. Box 6, Palampur (H.P.) 176061, India
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Xu H, Zhang W, Gao Y, Zhao Y, Guo L, Wang J. Proteomic analysis of embryo development in rice (Oryza sativa). PLANTA 2012; 235:687-701. [PMID: 22015996 DOI: 10.1007/s00425-011-1535-4] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/21/2011] [Accepted: 10/04/2011] [Indexed: 05/26/2023]
Abstract
Although embryo development is a major subject in plant growth and development research, a number of aspects of the mechanism of this development process remain unknown. Rice (Oryza sativa) is an excellent monocot plant model for studying embryogenesis with a known genome sequence. Here, we conducted proteomic analysis of embryo development in rice (O. sativa L. ssp. indica cv. 9311). The aim was to investigate and characterize the changes in the protein expression profile during embryo development. For this purpose, the proteome of developing embryos was characterized by two-dimensional gel electrophoresis and nano liquid chromatography/mass spectrometry/mass spectrometry. Proteomic analyses identified 275 differentially expressed proteins throughout the 5 sequential developmental stages from 5 to 30 days after pollination. Most of these proteins were classified into eight functional categories: metabolism, protein synthesis/destination, disease and defense, transporter, transcription, signal transduction, cell growth/division, and storage proteins, which were involved in different cellular and metabolic processes. Hierarchical clustering analyses of protein expression profiles showed that highly expressed proteins in early stages were involved in metabolism, protein synthesis/destination, and most of the other cellular functions, whereas the proteins highly expressed in later stages functioned in the desiccation and dormancy of the embryo.
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Affiliation(s)
- Hong Xu
- Key Laboratory of MOE for Plant Development Biology, State Key Laboratory of Hybrid Rice, College of Life Sciences, Wuhan University, Wuhan 430072, China
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Bai Y, Yang Q, Kang J, Sun Y, Gruber M, Chao Y. Isolation and functional characterization of a Medicago sativa L. gene, MsLEA3-1. Mol Biol Rep 2012; 39:2883-92. [PMID: 21681426 PMCID: PMC3271230 DOI: 10.1007/s11033-011-1048-z] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2010] [Accepted: 06/04/2011] [Indexed: 11/24/2022]
Abstract
A full-length cDNA of 1,728 nt, called MsLEA3-1, was cloned from alfalfa by rapid amplification of cDNA ends from an expressed sequence tag homologous to soybean pGmPM10 (accession No. AAA91965.1). MsLEA3-1, encodes a deduced protein of 436 amino acids, a calculated molecular weight of 47.0 kDa, a theoretical isoelectric point of 5.18, and closest homology with late embryogenesis abundant proteins in soybean. Sequence homology suggested a signal peptide in the N terminus, and subcellular localization with GFP revealed that MsLEA3-1 was localized preferentially to the nucleolus. The transcript titre of MsLEA3-1 was strongly enriched in leaves compared with roots and stems of mature alfalfa plants. Gene expression of MsLEA3-1 was strongly induced when seedlings were treated with NaCl and ABA. Expression of the MsLEA3-1 transgenic was detected in transgenic tobacco. Malondialdehyde content and, electrical conductivity content were reduced and electrical conductivity and proline content were increased in transgenic tobacco compared with non-transgenic tobacco under salt stress. The results showed that accumulation of the MsLEA3-1 protein in the vegetative tissues of transgenic plants enhanced their tolerance to salt stress. These results demonstrate a role for the MsLEA3-1 protein in stress protection and suggest the potential of the MsLEA3-1 gene for genetic engineering of salt tolerance.
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Affiliation(s)
- Yongqin Bai
- Institute of Animal Sciences, Chinese Academy of Agricultural Sciences, Beijing, 100193 People’s Republic of China
| | - Qingchuan Yang
- Institute of Animal Sciences, Chinese Academy of Agricultural Sciences, Beijing, 100193 People’s Republic of China
| | - Junmei Kang
- Institute of Animal Sciences, Chinese Academy of Agricultural Sciences, Beijing, 100193 People’s Republic of China
| | - Yan Sun
- Grassland Science, Department of Animal Sciences and Technology College, China Agriculture University, Beijing, 100193 People’s Republic of China
| | - Margaret Gruber
- Saskatoon Research Centre, Agriculture and Agri-Food Canada, Saskatoon, SK S7N0X2 Canada
| | - Yuehui Chao
- Institute of Animal Sciences, Chinese Academy of Agricultural Sciences, Beijing, 100193 People’s Republic of China
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Padmalatha KV, Dhandapani G, Kanakachari M, Kumar S, Dass A, Patil DP, Rajamani V, Kumar K, Pathak R, Rawat B, Leelavathi S, Reddy PS, Jain N, Powar KN, Hiremath V, Katageri IS, Reddy MK, Solanke AU, Reddy VS, Kumar PA. Genome-wide transcriptomic analysis of cotton under drought stress reveal significant down-regulation of genes and pathways involved in fibre elongation and up-regulation of defense responsive genes. PLANT MOLECULAR BIOLOGY 2012; 78:223-46. [PMID: 22143977 DOI: 10.1007/s11103-011-9857-y] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/14/2011] [Accepted: 11/08/2011] [Indexed: 05/06/2023]
Abstract
Cotton is an important source of natural fibre used in the textile industry and the productivity of the crop is adversely affected by drought stress. High throughput transcriptomic analyses were used to identify genes involved in fibre development. However, not much information is available on cotton genome response in developing fibres under drought stress. In the present study a genome wide transcriptome analysis was carried out to identify differentially expressed genes at various stages of fibre growth under drought stress. Our study identified a number of genes differentially expressed during fibre elongation as compared to other stages. High level up-regulation of genes encoding for enzymes involved in pectin modification and cytoskeleton proteins was observed at fibre initiation stage. While a large number of genes encoding transcription factors (AP2-EREBP, WRKY, NAC and C2H2), osmoprotectants, ion transporters and heat shock proteins and pathways involved in hormone (ABA, ethylene and JA) biosynthesis and signal transduction were up-regulated and genes involved in phenylpropanoid and flavonoid biosynthesis, pentose and glucuronate interconversions and starch and sucrose metabolism pathways were down-regulated during fibre elongation. This study showed that drought has relatively less impact on fibre initiation but has profound effect on fibre elongation by down-regulating important genes involved in cell wall loosening and expansion process. The comprehensive transcriptome analysis under drought stress has provided valuable information on differentially expressed genes and pathways during fibre development that will be useful in developing drought tolerant cotton cultivars without compromising fibre quality.
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He S, Tan L, Hu Z, Chen G, Wang G, Hu T. Molecular characterization and functional analysis by heterologous expression in E. coli under diverse abiotic stresses for OsLEA5, the atypical hydrophobic LEA protein from Oryza sativa L. Mol Genet Genomics 2011; 287:39-54. [PMID: 22127413 DOI: 10.1007/s00438-011-0660-x] [Citation(s) in RCA: 54] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2011] [Accepted: 11/12/2011] [Indexed: 10/15/2022]
Abstract
In this study, we report the molecular characterization and functional analysis of OsLEA5 gene, which belongs to the atypical late embryogenesis abundant (LEA) group 5C from Oryza sativa L. The cDNA of OsLEA5 contains a 456 bp ORF encoding a polypeptide of 151 amino acids with a calculated molecular mass of 16.5 kDa and a theoretical pI of 5.07. The OsLEA5 polypeptide is rich in Leu (10%), Ser (8.6%), and Asp (8.6%), while Cys, Trp, and Gln residue contents are very low, which are 2, 1.3, and 1.3%, respectively. Bioinformatic analysis revealed that group 5C LEA protein subfamily contains a Pfam:LEA_2 domain architecture and is highly hydrophobic, intrinsically ordered with largely β-sheet and specific amino acid composition and distribution. Real-time PCR analysis showed that OsLEA5 was expressed in different tissue organs during different development stages of rice. The expression levels of OsLEA5 in the roots and panicles of full ripe stage were dramatically increased. The results of stress tolerance and cell viability assay demonstrated that recombinant E. coli cells producing OsLEA5 fusion protein exhibited improved resistance against diverse abiotic stresses: high salinity, osmotic, freezing, heat, and UV radiation. The OsLEA5 protein confers stabilization of the LDH under different abiotic stresses, such as heating, freeze-thawing, and drying in vitro. The combined results indicated that OsLEA5 protein was a hydrophobic atypical LEA and closely associated with resistance to multiple abiotic stresses. This research offered the valuable information for the development of crops with enhanced resistance to diverse stresses.
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Affiliation(s)
- Shuai He
- Key Laboratory of Biorheological Science and Technology, Ministry of Education, College of Bioengineering, Chongqing University, Chongqing, China
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Gai YP, Ji XL, Lu W, Han XJ, Yang GD, Zheng CC. A novel late embryogenesis abundant like protein associated with chilling stress in Nicotiana tabacum cv. bright yellow-2 cell suspension culture. Mol Cell Proteomics 2011; 10:M111.010363. [PMID: 21653253 PMCID: PMC3226408 DOI: 10.1074/mcp.m111.010363] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2011] [Indexed: 12/22/2022] Open
Abstract
Low temperature is one of the major abiotic stresses limiting the productivity and geographical distribution of many important crops. To identify proteins associated with chilling stress in Nicotiana tabacum cv. bright yellow-2 (BY-2) cell suspension culture, we utilized a proteomic approach with two-dimensional electrophoresis to compare proteins from samples of treated with or without chilling treatment at 4 °C. One protein specifically more abundant in chilling treated sample was identified and designated as NtLEA7-3. Rapid amplification of cDNA ends gave rise to a full-length NtLEA7-3 cDNA with a complete open reading frame of 1267 bp, encoding a 322 amino acid polypeptide. Homology search and sequence multi-alignment demonstrated that the deduced NtLEA7-3 protein sequence shared a high identity with LEA-like proteins from other plants. Subcellular localization analysis indicated that the NtLEA7-3 was localized exclusively in the nucleus. When the gene was overexpressed in bright yellow-2 cells, the transgenic bright yellow-2 cells show more resistant to chilling stress than the wild-type cells. In addition, transgenic Arabidopsis plants overexpressing the NtLEA7-3 are much more resistant to cold, drought, and salt stresses. Interestingly, the expression of NtLEA7-3 in tobacco was not tissue-specific and induced by chilling, drought and salt stresses. All of these, taken together, suggest that NtLEA7-3 is worthwhile to elucidate the contribution of the proteins to the tolerance mechanism to chilling stress, and can be considered as a potential target for crop genetic improvement in the future.
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Affiliation(s)
- Ying-Ping Gai
- From the ‡State Key Laboratory of Crop Biology, Shandong Agricultural University, Taian, Shandong, 271018, P.R. China
| | - Xian-Ling Ji
- From the ‡State Key Laboratory of Crop Biology, Shandong Agricultural University, Taian, Shandong, 271018, P.R. China
| | - Wei Lu
- From the ‡State Key Laboratory of Crop Biology, Shandong Agricultural University, Taian, Shandong, 271018, P.R. China
| | - Xue-Juan Han
- From the ‡State Key Laboratory of Crop Biology, Shandong Agricultural University, Taian, Shandong, 271018, P.R. China
| | - Guo-Dong Yang
- From the ‡State Key Laboratory of Crop Biology, Shandong Agricultural University, Taian, Shandong, 271018, P.R. China
| | - Cheng-Chao Zheng
- From the ‡State Key Laboratory of Crop Biology, Shandong Agricultural University, Taian, Shandong, 271018, P.R. China
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Liu X, Wang Y, Gao H, Xu X. Identification and characterization of genes encoding two novel LEA proteins in Antarctic and temperate strains of Chlorella vulgaris. Gene 2011; 482:51-8. [DOI: 10.1016/j.gene.2011.05.006] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2011] [Revised: 05/16/2011] [Accepted: 05/16/2011] [Indexed: 11/16/2022]
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Park SC, Kim YH, Jeong JC, Kim CY, Lee HS, Bang JW, Kwak SS. Sweetpotato late embryogenesis abundant 14 (IbLEA14) gene influences lignification and increases osmotic- and salt stress-tolerance of transgenic calli. PLANTA 2011; 233:621-34. [PMID: 21136074 DOI: 10.1007/s00425-010-1326-3] [Citation(s) in RCA: 90] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/19/2010] [Accepted: 11/17/2010] [Indexed: 05/08/2023]
Abstract
Late embryogenesis abundant 14 (LEA14) cDNA was isolated from an EST library prepared from dehydration-treated fibrous roots of sweetpotato (Ipomoea batatas). Quantitative RT-PCR revealed a variety of different IbLEA14 expression patterns under various abiotic stress conditions. IbLEA14 expression was strongly induced by dehydration, NaCl and abscisic acid treatments in sweetpotato plants. Transgenic sweetpotato non-embryogenic calli harboring IbLEA14 overexpression or RNAi vectors under the control of CaMV 35S promoter were generated. Transgenic calli overexpressing IbLEA14 showed enhanced tolerance to drought and salt stress, whereas RNAi calli exhibited increased stress sensitivity. Under normal culture conditions, lignin contents increased in IbLEA14-overexpressing calli because of the increased expression of a variety of monolignol biosynthesis-related genes. Stress treatments elicited higher expression levels of the gene encoding cinnamyl alcohol dehydrogenase in IbLEA14-overexpressing lines than in control or RNAi lines. These results suggest that IbLEA14 might positively regulate the response to various stresses by enhancing lignification.
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Affiliation(s)
- Sung-Chul Park
- Environmental Biotechnology Research Center, Korea Research Institute of Bioscience and Biotechnology, Oun-dong 52, Yusong-gu, Daejeon, 305-806, Republic of Korea
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George S, Usha B, Parida A. Isolation and characterization of an atypical LEA protein coding cDNA and its promoter from drought-tolerant plant Prosopis juliflora. Appl Biochem Biotechnol 2008; 157:244-53. [PMID: 19002660 DOI: 10.1007/s12010-008-8398-6] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2008] [Accepted: 10/09/2008] [Indexed: 10/21/2022]
Abstract
Plant growth and productivity are adversely affected by various abiotic and biotic stress factors. Despite the wealth of information on abiotic stress and stress tolerance in plants, many aspects still remain unclear. Prosopis juliflora is a hardy plant reported to be tolerant to drought, salinity, extremes of soil pH, and heavy metal stress. In this paper, we report the isolation and characterization of the complementary DNA clone for an atypical late embryogenesis abundant (LEA) protein (Pj LEA3) and its putative promoter sequence from P. juliflora. Unlike typical LEA proteins, rich in glycine, Pj LEA3 has alanine as the most abundant amino acid followed by serine and shows an average negative hydropathy. Pj LEA3 is significantly different from other LEA proteins in the NCBI database and shows high similarity to indole-3 acetic-acid-induced protein ARG2 from Vigna radiata. Northern analysis for Pj LEA3 in P. juliflora leaves under 90 mM H2O2 stress revealed up-regulation of transcript at 24 and 48 h. A 1.5-kb fragment upstream the 5' UTR of this gene (putative promoter) was isolated and analyzed in silico. The possible reasons for changes in gene expression during stress in relation to the host plant's stress tolerance mechanisms are discussed.
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Affiliation(s)
- Suja George
- M.S. Swaminathan Research Foundation, Taramani, Chennai 600113, India
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Khurana P, Vishnudasan D, Chhibbar AK. Genetic approaches towards overcoming water deficit in plants - special emphasis on LEAs. PHYSIOLOGY AND MOLECULAR BIOLOGY OF PLANTS : AN INTERNATIONAL JOURNAL OF FUNCTIONAL PLANT BIOLOGY 2008; 14:277-98. [PMID: 23572894 PMCID: PMC3550640 DOI: 10.1007/s12298-008-0026-y] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/05/2023]
Abstract
Water deficit arises as a result of low temperature, salinity and dehydration, thereby affecting plant growth adversely and making it imperative for plants to surmount such situations by acclimatizing/adapting at various levels. Water deficit stress results in significant changes in gene expression, mediated by interconnected signal transduction pathways that may be triggered by calcium, and regulated via ABA dependent and/or independent pathways. Hence, adaptation of plants to such stresses involves maintaining cellular homeostasis, detoxification of harmful elements and also growth alterations. Stress in general cause excess production of reactive oxygen species (ROS) and the plants overcome the same by either preventing the accumulation of ROS or by eliminating the ROS formed. Ion homeostasis includes processes such as cellular uptake, sequestration and export in conjunction with long distance transport. Requisite amounts of osmolytes are hence synthesized under stress to maintain turgor along with maintaining the macromolecular structures and also for scavenging ROS. Another noteworthy response is the accumulation of novel proteins, including enzymes involved in the biosynthesis of osmoprotectants, heat-shock proteins (HSPs), late embryogenesis abundant (LEA) proteins, antifreeze proteins, chaperones, detoxification enzymes, transcription factors, kinases and phosphatases. The LEAs belong to a redundant protein family and are highly hydrophilic, boiling-soluble, non-globular and therefore have been defined and classified accordingly. The precise function of LEAs is still unknown, but substantial evidence indicates their involvement in dessication tolerance as the expression of LEAs confers increased resistance to stress in heterologous yeast system and also significantly improves water deficit tolerance in transgenic plants. Genetic manipulation of plants towards conferring abiotic stress tolerance is a daunting task, as the abiotic stress tolerance mechanism is highly complex and various strategies have been exploited to address and evaluate the stress tolerance mechanism, and the molecular responses to water deficit via complex signaling networks. Genomic technologies have recently been useful in integrating the multigenicity of the plant stress responses through, transcriptomics, proteomics and metabolite profilling and their interactions. This review deals with the recent developments on genetic approaches for water stress tolerance in plants, with special emphasis on LEAs.
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Affiliation(s)
- Paramjit Khurana
- Department of Plant Molecular Biology, University of Delhi South Campus, New Delhi, 110 021 India
| | - Dalia Vishnudasan
- Department of Plant Molecular Biology, University of Delhi South Campus, New Delhi, 110 021 India
| | - Anju K. Chhibbar
- Department of Plant Molecular Biology, University of Delhi South Campus, New Delhi, 110 021 India
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Battaglia M, Olvera-Carrillo Y, Garciarrubio A, Campos F, Covarrubias AA. The enigmatic LEA proteins and other hydrophilins. PLANT PHYSIOLOGY 2008; 148:6-24. [PMID: 18772351 PMCID: PMC2528095 DOI: 10.1104/pp.108.120725] [Citation(s) in RCA: 503] [Impact Index Per Article: 31.4] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/08/2008] [Accepted: 07/08/2008] [Indexed: 05/17/2023]
Affiliation(s)
- Marina Battaglia
- Departamento de Biología Molecular de Plantas , Instituto de Biotecnología, Universidad Nacional Autónoma de México, Cuernavaca, Morelos 62250, Mexico
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George S, Venkataraman G, Parida A. Identification of stress-induced genes from the drought-tolerant plant Prosopis juliflora (Swartz) DC. through analysis of expressed sequence tags. Genome 2007; 50:470-8. [PMID: 17612616 DOI: 10.1139/g07-014] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Abiotic stresses such as cold, salinity, drought, wounding, and heavy metal contamination adversely affect crop productivity throughout the world. Prosopis juliflora is a phreatophyte that can tolerate severe adverse environmental conditions such as drought, salinity, and heavy metal contamination. As a first step towards the characterization of genes that contribute to combating abiotic stress, construction and analysis of a cDNA library of P. juliflora genes is reported here. Random expressed sequence tag (EST) sequencing of 1750 clones produced 1467 high-quality reads. These clones were classified into functional categories, and BLAST comparisons revealed that 114 clones were homologous to genes implicated in stress response(s) and included heat shock proteins, metallothioneins, lipid transfer proteins, and late embryogenesis abundant proteins. Of the ESTs analyzed, 26% showed homology to previously uncharacterized genes in the databases. Fifty-two clones from this category were selected for reverse Northern analysis: 21 were shown to be upregulated and 16 downregulated. The results obtained by reverse Northern analysis were confirmed by Northern analysis. Clustering of the 1467 ESTs produced a total of 295 contigs encompassing 790 ESTs, resulting in a 54.2% redundancy. Two of the abundant genes coding for a nonspecific lipid transfer protein and late embryogenesis abundant protein were sequenced completely. Northern analysis (after polyethylene glycol stress) of the 2 genes was carried out. The implications of the analyzed genes in abiotic stress tolerance are also discussed.
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Affiliation(s)
- Suja George
- Department of Plant Molecular Biology, M.S. Swaminathan Research Foundation, Taramani Institutional Area, Chennai 600 113, India
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Xiao B, Huang Y, Tang N, Xiong L. Over-expression of a LEA gene in rice improves drought resistance under the field conditions. TAG. THEORETICAL AND APPLIED GENETICS. THEORETISCHE UND ANGEWANDTE GENETIK 2007; 115:35-46. [PMID: 17426956 DOI: 10.1007/s00122-007-0538-9] [Citation(s) in RCA: 260] [Impact Index Per Article: 15.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/11/2006] [Accepted: 03/17/2007] [Indexed: 05/14/2023]
Abstract
Late embryogenesis abundant (LEA) proteins have been implicated in many stress responses of plants. In this report, a LEA protein gene OsLEA3-1 was identified and over-expressed in rice to test the drought resistance of transgenic lines under the field conditions. OsLEA3-1 is induced by drought, salt and abscisic acid (ABA), but not by cold stress. The promoter of OsLEA3-1 isolated from the upland rice IRAT109 exhibits strong activity under drought- and salt-stress conditions. Three expression constructs consisting of the full-length cDNA driven by the drought-inducible promoter of OsLEA3-1 (OsLEA3-H), the CaMV 35S promoter (OsLEA3-S), and the rice Actin1 promoter (OsLEA3-A) were transformed into the drought-sensitive japonica rice Zhonghua 11. Drought resistance pre-screening of T(1) families at anthesis stage revealed that the over-expressing families with OsLEA3-S and OsLEA3-H constructs had significantly higher relative yield (yield under drought stress treatment/yield under normal growth conditions) than the wild type under drought stress conditions, although a yield penalty existed in T(1) families under normal growth conditions. Nine homozygous families, exhibiting over-expression of a single-copy of the transgene and relatively low yield penalty in the T(1) generation, were tested in the field for drought resistance in the T(2) and T(3) generations and in the PVC pipes for drought tolerance in the T(2) generation. Except for two families (transformed with OsLEA3-A), all the other families (transformed with OsLEA3-S and OsLEA3-H constructs) had higher grain yield than the wild type under drought stress in both the field and the PVC pipes conditions. No significant yield penalty was detected for these T(2 )and T(3) families. These results indicate that transgenic rice with significantly enhanced drought resistance and without yield penalty can be generated by over-expressing OsLEA3-1 gene with appropriate promoters and following a bipartite (stress and non-stress) in-field screening protocol.
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Affiliation(s)
- Benze Xiao
- National Center of Plant Gene Research (Wuhan), National Key Laboratory of Crop Genetic Improvement, Huazhong Agricultural University, Wuhan 430070, China
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Over-expression of a LEA gene in rice improves drought resistance under the field conditions. TAG. THEORETICAL AND APPLIED GENETICS. THEORETISCHE UND ANGEWANDTE GENETIK 2007. [PMID: 17426956 DOI: 10.1007/s00122‐007‐0538‐9] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Subscribe] [Scholar Register] [Indexed: 09/29/2022]
Abstract
Late embryogenesis abundant (LEA) proteins have been implicated in many stress responses of plants. In this report, a LEA protein gene OsLEA3-1 was identified and over-expressed in rice to test the drought resistance of transgenic lines under the field conditions. OsLEA3-1 is induced by drought, salt and abscisic acid (ABA), but not by cold stress. The promoter of OsLEA3-1 isolated from the upland rice IRAT109 exhibits strong activity under drought- and salt-stress conditions. Three expression constructs consisting of the full-length cDNA driven by the drought-inducible promoter of OsLEA3-1 (OsLEA3-H), the CaMV 35S promoter (OsLEA3-S), and the rice Actin1 promoter (OsLEA3-A) were transformed into the drought-sensitive japonica rice Zhonghua 11. Drought resistance pre-screening of T(1) families at anthesis stage revealed that the over-expressing families with OsLEA3-S and OsLEA3-H constructs had significantly higher relative yield (yield under drought stress treatment/yield under normal growth conditions) than the wild type under drought stress conditions, although a yield penalty existed in T(1) families under normal growth conditions. Nine homozygous families, exhibiting over-expression of a single-copy of the transgene and relatively low yield penalty in the T(1) generation, were tested in the field for drought resistance in the T(2) and T(3) generations and in the PVC pipes for drought tolerance in the T(2) generation. Except for two families (transformed with OsLEA3-A), all the other families (transformed with OsLEA3-S and OsLEA3-H constructs) had higher grain yield than the wild type under drought stress in both the field and the PVC pipes conditions. No significant yield penalty was detected for these T(2 )and T(3) families. These results indicate that transgenic rice with significantly enhanced drought resistance and without yield penalty can be generated by over-expressing OsLEA3-1 gene with appropriate promoters and following a bipartite (stress and non-stress) in-field screening protocol.
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Cho EK, Hong CB. Over-expression of tobacco NtHSP70-1 contributes to drought-stress tolerance in plants. PLANT CELL REPORTS 2006; 25:349-58. [PMID: 16365678 DOI: 10.1007/s00299-005-0093-2] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/15/2005] [Revised: 11/08/2005] [Accepted: 11/19/2005] [Indexed: 05/05/2023]
Abstract
HSP70, a heat shock protein, is a molecular chaperone responsive to various environmental stresses. Here, NtHSP70-1 was a drought-/ABA-inducible gene. We monitored the expression of CaERD15 (early responsive to dehydration) with exposing plants to progressive drought stress. Its activity was used as an indicator of water-deficit conditions. To analyze the protective role of HSP70, we obtained transgenic tobacco plants that constitutively expressed elevated levels of the tobacco HSP70, NtHSP70-1, as well as transgenic plants containing either the vector alone or else having NtHSP70-1 in the antisense orientation. Plants with enhanced levels of NtHSP70-1 in their transgenic sense lines exhibited tolerance to water stress. Under progressive drought, the amount of leaf NtHSP70-1 was correlated with maintenance of optimum water content, with contents being higher in the leaves of dehydrated transgenic sense plants than in those of either the control (vector-only) or the transgenic antisense plants. Moreover, the expression of CaERD15 was considerably reduced in tobacco plants that over-expressed NtHSP70-1. These results suggest that elevated levels of NtHSP70-1 can confer drought-stress tolerance.
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Affiliation(s)
- Eun Kyung Cho
- Institute of Molecular Biology and Genetics and School of Biological Sciences, Seoul National University, Seoul 151-742, Korea.
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