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Zhang H, Qi C, Li C, Huang D, Mao H, Lin X. Overexpression of high affinity K + transporter from Nitraria sibirica enhanced salt tolerance of transgenic plants. PLANT SCIENCE : AN INTERNATIONAL JOURNAL OF EXPERIMENTAL PLANT BIOLOGY 2024; 342:112052. [PMID: 38417716 DOI: 10.1016/j.plantsci.2024.112052] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/03/2023] [Revised: 01/27/2024] [Accepted: 02/23/2024] [Indexed: 03/01/2024]
Abstract
Nitraria sibirica Pall is a halophytic shrub growing in desert steppe zones. It exhibits extraordinary adaptability to saline-alkali soil, drought, and sand burial. In this study, the high-affinity K+ transporter NsHKT1 was identified and found to play a key role in salt tolerance in N. sibirica. NsHKT1 was used to improve salt tolerance in a poplar hybrid. The expression characteristics of NsHKT1 were analyzed by transforming Arabidopsis and poplar with the β-glucuronidase (GUS) gene driven by the NsHKT1 promoter. The results showed that NsHKT1 expression was induced by various abiotic stresses and phytohormones. GUS expression was also detected in the reproductive organs of transgenic Arabidopsis, indicating its function in regulating plant reproductive growth. Transgenic 84 K poplar plants overexpressing NsHKT1 exhibited less damage, higher antioxidant capacity, higher chlorophyll and proline levels, and lower malondialdehyde content compared with non-transgenic plants under salt stress. These results are consistent with the salt tolerance results for transgenic Arabidopsis overexpressing NsHKT1, indicating that NsHKT1 plays a key role in salt tolerance in herbaceous and ligneous plants. Inductively coupled plasma-optical emission spectrometry showed a significantly lower leaf Na+ content in transgenic poplar than in the non-transgenic line, revealing that NsHKT1, as a member of HKT family subclass 1, was highly selective to Na+ and prevented shoot Na+ accumulation. Transcriptome analysis indicated that differentially expressed genes in transgenic poplars under salt stress were associated mainly with the isoflavonoid, cutin, suberine, wax, anthocyanin, flavonoid, and cyanoamino biosynthesis pathways, as well as the MAPK signaling pathway, indicating that NsHKT1 not only regulates ion homeostasis but also influences secondary metabolism and signal transaction in transgenic plants.
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Affiliation(s)
- Haidong Zhang
- Key Laboratory of Herbage and Endemic Crop Biology of Ministry Education, College of Life Sciences, Inner Mongolia University, Hohhot 010070, China
| | - Caifen Qi
- Key Laboratory of Herbage and Endemic Crop Biology of Ministry Education, College of Life Sciences, Inner Mongolia University, Hohhot 010070, China
| | - Chaoran Li
- Key Laboratory of Herbage and Endemic Crop Biology of Ministry Education, College of Life Sciences, Inner Mongolia University, Hohhot 010070, China
| | - Duoman Huang
- Key Laboratory of Herbage and Endemic Crop Biology of Ministry Education, College of Life Sciences, Inner Mongolia University, Hohhot 010070, China
| | - Huiping Mao
- Key Laboratory of Herbage and Endemic Crop Biology of Ministry Education, College of Life Sciences, Inner Mongolia University, Hohhot 010070, China.
| | - Xiaofei Lin
- Key Laboratory of Herbage and Endemic Crop Biology of Ministry Education, College of Life Sciences, Inner Mongolia University, Hohhot 010070, China; State Key Laboratory of Reproductive Regulation and Breeding of Grassland Livestock, College of Life Sciences, Inner Mongolia University, Hohhot 010070, China.
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Gu S, Han S, Abid M, Bai D, Lin M, Sun L, Qi X, Zhong Y, Fang J. A High-K + Affinity Transporter (HKT) from Actinidia valvata Is Involved in Salt Tolerance in Kiwifruit. Int J Mol Sci 2023; 24:15737. [PMID: 37958739 PMCID: PMC10647804 DOI: 10.3390/ijms242115737] [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: 09/25/2023] [Revised: 10/21/2023] [Accepted: 10/23/2023] [Indexed: 11/15/2023] Open
Abstract
Ion transport is crucial for salt tolerance in plants. Under salt stress, the high-affinity K+ transporter (HKT) family is mainly responsible for the long-distance transport of salt ions which help to reduce the deleterious effects of high concentrations of ions accumulated within plants. Kiwifruit is well known for its susceptibility to salt stress. Therefore, a current study was designed to decipher the molecular regulatory role of kiwifruit HKT members in the face of salt stress. The transcriptome data from Actinidia valvata revealed that salt stress significantly induced the expression of AvHKT1. A multiple sequence alignment analysis indicated that the AvHKT1 protein contains three conserved amino acid sites for the HKT family. According to subcellular localization analysis, the protein was primarily present in the cell membrane and nucleus. Additionally, we tested the AvHKT1 overexpression in 'Hongyang' kiwifruit, and the results showed that the transgenic lines exhibited less leaf damage and improved plant growth compared to the control plants. The transgenic lines displayed significantly higher SPAD and Fv/Fm values than the control plants. The MDA contents of transgenic lines were also lower than that of the control plants. Furthermore, the transgenic lines accumulated lower Na+ and K+ contents, proving this protein involvement in the transport of Na+ and K+ and classification as a type II HKT transporter. Further research showed that the peroxidase (POD) activity in the transgenic lines was significantly higher, indicating that the salt-induced overexpression of AvHKT1 also scavenged POD. The promoter of AvHKT1 contained phytohormone and abiotic stress-responsive cis-elements. In a nutshell, AvHKT1 improved kiwifruit tolerance to salinity by facilitating ion transport under salt stress conditions.
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Affiliation(s)
| | | | | | | | | | | | | | - Yunpeng Zhong
- National Key Laboratory for Germplasm Innovation & Utilization of Horticultural Crops, Zhengzhou Fruit Research Institute, Chinese Academy of Agricultural Sciences, Zhengzhou 450009, China; (S.G.); (S.H.); (M.A.); (D.B.); (M.L.); (L.S.); (X.Q.)
| | - Jinbao Fang
- National Key Laboratory for Germplasm Innovation & Utilization of Horticultural Crops, Zhengzhou Fruit Research Institute, Chinese Academy of Agricultural Sciences, Zhengzhou 450009, China; (S.G.); (S.H.); (M.A.); (D.B.); (M.L.); (L.S.); (X.Q.)
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Tounsi S, Jemli S, Feki K, Brini F, Najib Saïdi M. Superoxide dismutase (SOD) family in durum wheat: promising candidates for improving crop resilience. PROTOPLASMA 2023; 260:145-158. [PMID: 35484428 DOI: 10.1007/s00709-022-01767-w] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/01/2022] [Accepted: 04/24/2022] [Indexed: 06/14/2023]
Abstract
The SOD family has been extensively analyzed at genome wide level in several crops. However, little is known about this family in durum wheat. In this study, a total of 14 TdSOD genes were identified in whole durum wheat genome including 8 TdCu-ZnSODs, 2 TdMnSODs, and 4 TdFeSODs. In silico analysis evinced that TdSOD family members displayed a closer evolutionary relationship, similar gene structure and protein features with their homologs from other plant species. Furthermore, the analysis of their promoter regions revealed the presence of a great number of cis-regulatory elements related to plant development, abiotic and biotic stresses, phytohormones, and several potential binding sites for transcription factors. Interestingly, 3D structure analysis revealed that TdCu-ZnSOD2A-2 and TdCu-ZnSOD2B-2, belonging to the Cu-Zn group, were modeled as copper chaperone for SOD like their homologs from rice and Arabidopsis. The expression profile of eight TdSOD candidate genes was investigated under salt, drought, cold, and ABA treatments. Notably, TdCu-ZnSOD2A-1, TdFeSOD4A-1, and TdFeSOD7A-1 were significantly up-regulated under all stress treatments. On the other hand, TdCu-ZnSOD7B and TdMnSOD2B were strongly expressed in roots and leaves under cold stress and TdCu-ZnSOD2B-2 was particularly up-regulated in leaves under ABA treatment. Ultimately, these findings provide valuable information for the identification of attractive candidate genes to improve wheat resilience.
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Affiliation(s)
- Sana Tounsi
- Biotechnology and Plant Improvement Laboratory, Centre of Biotechnology of Sfax (CBS), University of Sfax, B.P "1177" 3018, Sfax, Tunisia.
| | - Sonia Jemli
- Laboratory of Microbial Biotechnology Enzymatic and Biomolecules, Centre of Biotechnology of Sfax (CBS), University of Sfax, P.O Box 1177, 3018, Sfax, Tunisia
- Biology Department, Faculty of Sciences of Sfax, University of Sfax, Sfax, Tunisia
| | - Kaouthar Feki
- Laboratory of Legumes and Sustainable Agrosystem (L2AD), Center of Biotechnology of Borj-Cedria, BP901, 2050, Hammam‑Lif, Tunisia
| | - Faiçal Brini
- Biotechnology and Plant Improvement Laboratory, Centre of Biotechnology of Sfax (CBS), University of Sfax, B.P "1177" 3018, Sfax, Tunisia.
| | - Mohamed Najib Saïdi
- Biotechnology and Plant Improvement Laboratory, Centre of Biotechnology of Sfax (CBS), University of Sfax, B.P "1177" 3018, Sfax, Tunisia
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Dave A, Sanadhya P, Joshi PS, Agarwal P, Agarwal PK. Molecular cloning and characterization of high-affinity potassium transporter (AlHKT2;1) gene promoter from halophyte Aeluropus lagopoides. Int J Biol Macromol 2021; 181:1254-1264. [PMID: 33989688 DOI: 10.1016/j.ijbiomac.2021.05.038] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2021] [Revised: 03/20/2021] [Accepted: 05/04/2021] [Indexed: 11/19/2022]
Abstract
HKT subfamily II functions as Na+- K+ co-transporter and prevents plants from salinity stress. A 760 bp promoter region of AlHKT2;1 was isolated, sequenced and cloned. The full length promoter D1, has many cis-regulatory elements like MYB, MBS, W box, ABRE etc. involved in abiotic stress responses. D1 and subsequent 5' deletions were cloned into pCAMBIA1301 and studied for its efficacy in stress conditions in heterologous system. Blue colour staining was observed in flower petals, anther lobe, and dehiscence slit of anther in T0 plants. The T1 seedlings showed staining in leaf veins, shoot vasculature and root except root tip. T1 seedlings were subjected to NaCl, KCl, NaCl + KCl and ABA stresses. GUS activity was quantified by 4-methylumbelliferyl glucuronide (4-MUG) assay under control and stress conditions. The smallest deletion- D4 also showed GUS expression but highest activity was observed in D2 as compared to full length promoter and other deletions. The electrophoretic mobility shift assay using stress-induced protein with different promoter deletions revealed more prominent binding in D2. These results suggest that AlHKT2;1 promoter is involved in abiotic stress response and deletion D2 might be sufficient to drive the stress-inducible expression of various genes involved in providing stress tolerance in plants.
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Affiliation(s)
- Ankita Dave
- Division of Plant Omics, CSIR-Central Salt and Marine Chemicals Research Institute (CSIR-CSMCRI), Council of Scientific and Industrial Research (CSIR), Gijubhai Badheka Marg, Bhavnagar 364 002, Gujarat, India; Academy of Scientific and Innovative Research (AcSIR), Ghaziabad 201002, India
| | - Payal Sanadhya
- Division of Plant Omics, CSIR-Central Salt and Marine Chemicals Research Institute (CSIR-CSMCRI), Council of Scientific and Industrial Research (CSIR), Gijubhai Badheka Marg, Bhavnagar 364 002, Gujarat, India
| | - Priyanka S Joshi
- Division of Plant Omics, CSIR-Central Salt and Marine Chemicals Research Institute (CSIR-CSMCRI), Council of Scientific and Industrial Research (CSIR), Gijubhai Badheka Marg, Bhavnagar 364 002, Gujarat, India; Academy of Scientific and Innovative Research (AcSIR), Ghaziabad 201002, India
| | - Parinita Agarwal
- Division of Plant Omics, CSIR-Central Salt and Marine Chemicals Research Institute (CSIR-CSMCRI), Council of Scientific and Industrial Research (CSIR), Gijubhai Badheka Marg, Bhavnagar 364 002, Gujarat, India
| | - Pradeep K Agarwal
- Division of Plant Omics, CSIR-Central Salt and Marine Chemicals Research Institute (CSIR-CSMCRI), Council of Scientific and Industrial Research (CSIR), Gijubhai Badheka Marg, Bhavnagar 364 002, Gujarat, India; Academy of Scientific and Innovative Research (AcSIR), Ghaziabad 201002, India.
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Tounsi S, Saïdi MN, Abdelhedi R, Feki K, Bahloul N, Alcon C, Masmoudi K, Brini F. Functional analysis of TmHKT1;4-A2 promoter through deletion analysis provides new insight into the regulatory mechanism underlying abiotic stress adaptation. PLANTA 2021; 253:18. [PMID: 33392811 DOI: 10.1007/s00425-020-03533-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/27/2020] [Accepted: 12/06/2020] [Indexed: 06/12/2023]
Abstract
Bioinformatic, molecular, and biochemical analysis were performed to get more insight into the regulatory mechanism by which TmHKT1;4-A2 is regulated. HKT transporters from different plant species have been shown to play important role in plant response to salt. In previous work, TmHKT1;4-A2 gene from Triticum monococcum has been characterized as a major gene for Nax1 QTL (Tounsi et al. Plant Cell Physiol 57:2047-2057, 2016). So far, little is known about its regulatory mechanism. In this study, the promoter region of TmHKT1;4-A2 (1400 bp) was isolated and considered as the full-length promoter (PA2-1400). In silico analysis revealed the presence of important cis-acting elements related to abiotic stresses and phytohormones. Interestingly, our real-time RT-PCR analysis provided evidence that TmHKT1;4-A2 is regulated not only by salt stress but also by osmotic, heavy metal, oxidative, and hormones stresses. In transgenic Arabidopsis plants, TmHKT1;4-A2 is strongly active in vascular tissues of roots and leaves. Through 5'-end deletion analysis, we showed that PA2-1400 promoter is able to drive strong GUS activity under normal conditions and in response to different stresses compared to PA2-824 and PA2-366 promoters. These findings provide new information on the regulatory mechanism of TmHKT1;4-A2 and shed more light on its role under different stresses.
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Affiliation(s)
- Sana Tounsi
- Biotechnology and Plant Improvement Laboratory, Centre of Biotechnology of Sfax (CBS)/University of Sfax, B.P "1177", 3018, Sfax, Tunisia
| | - Mohamed Najib Saïdi
- Biotechnology and Plant Improvement Laboratory, Centre of Biotechnology of Sfax (CBS)/University of Sfax, B.P "1177", 3018, Sfax, Tunisia
| | - Rania Abdelhedi
- Laboratory of Molecular and Cellular Screening Processes, Centre of Biotechnology of Sfax, University of Sfax, Route Sidi Mansour, 3018, Sfax, Tunisia
| | - Kaouthar Feki
- Laboratory of Legumes, Centre of Biotechnology Bordj Cedria, BP 901, 2050, Hammam Lif, Tunisia
| | - Noura Bahloul
- Biotechnology and Plant Improvement Laboratory, Centre of Biotechnology of Sfax (CBS)/University of Sfax, B.P "1177", 3018, Sfax, Tunisia
| | - Carine Alcon
- Biochimie & Physiologie Moléculaire Des Plantes, PHIV Platform, UMR 5004 CNRS/386, INRA/Supagro Montpellier/Université Montpellier 2, Campus Supagro-INRA, 34060, Montpellier Cedex 2, France
| | - Khaled Masmoudi
- Department of Integrative Agriculture, College of Food and Agriculture, United Arab Emirates University, Al Ain, United Arab Emirates.
| | - Faiçal Brini
- Biotechnology and Plant Improvement Laboratory, Centre of Biotechnology of Sfax (CBS)/University of Sfax, B.P "1177", 3018, Sfax, Tunisia.
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Safi H, Belgaroui N, Masmoudi K, Brini F. Promoter of the wheat lipid transfer protein, TdLTP4, drives leaf-preferential expression in transgenic Arabidopsis plants. FUNCTIONAL PLANT BIOLOGY : FPB 2019; 46:275-285. [PMID: 32172770 DOI: 10.1071/fp18040] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/16/2018] [Accepted: 10/15/2018] [Indexed: 06/10/2023]
Abstract
In a previous report, a gene encoding a durum wheat lipid transfer protein, TdLTP4, was characterised as induced by abiotic and biotic stresses. In the present work, we investigated the regulation of the gene TdLTP4. A TdLTP4 promoter (PrTdLTP4) region of around 868-bp was isolated and sequenced. Its analysis revealed the presence of several DNA boxes known to be important mainly in the regulation of genes expressed under abiotic stress (salt and dehydration), abscisic acid (ABA) and pathogen responsiveness. The whole PrTdLTP4 fragment was fused to the reporter gene β-glucuronidase (gusA) and analysed in transgenic Arabidopsis plants. Histochemical assays of transgenic Arabidopsis plants showed that the 868-bp fragment of TdLTP4 gene promoter was found to be sufficient for both spatial and temporal patterns of its expression. Under control conditions, GUS histochemical staining was observed significantly only in young leaves of 8- and 12-day-old plants. Whereas after stress challenge especially with NaCl and mannitol, GUS transcripts expression increased substantially in leaves of 30-day-old transgenic seedlings. Real-time qPCR expression analysis of the gusA gene, confirmed the results of histochemical assays. Taken together these data provide evidence that PrTdLTP4 functions as abiotic-stress-inducible promoter in a heterologous dicot system and could be an excellent tool for future crop improvement.
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Affiliation(s)
- Héla Safi
- Biotechnology and Plant Improvement Laboratory, Centre of Biotechnology of Sfax (CBS)/University of Sfax, BP '1177' 3018, Sfax - Tunisia
| | - Nebras Belgaroui
- Biotechnology and Plant Improvement Laboratory, Centre of Biotechnology of Sfax (CBS)/University of Sfax, BP '1177' 3018, Sfax - Tunisia
| | - Khaled Masmoudi
- Biotechnology and Plant Improvement Laboratory, Centre of Biotechnology of Sfax (CBS)/University of Sfax, BP '1177' 3018, Sfax - Tunisia
| | - Faiçal Brini
- Biotechnology and Plant Improvement Laboratory, Centre of Biotechnology of Sfax (CBS)/University of Sfax, BP '1177' 3018, Sfax - Tunisia
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