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Zhang L, Hou M, Zhang X, Cao Y, Sun S, Zhu Z, Han S, Chen Y, Ku L, Duan C. Integrative transcriptome and proteome analysis reveals maize responses to Fusarium verticillioides infection inside the stalks. MOLECULAR PLANT PATHOLOGY 2023; 24:693-710. [PMID: 36938972 PMCID: PMC10257047 DOI: 10.1111/mpp.13317] [Citation(s) in RCA: 6] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/31/2022] [Revised: 02/14/2023] [Accepted: 02/15/2023] [Indexed: 06/11/2023]
Abstract
Fusarium stalk rot caused by Fusarium verticillioides is one of the most devastating diseases of maize that causes significant yield losses and poses potential security concerns for foods worldwide. The underlying mechanisms of maize plants regulating defence against the disease remain poorly understood. Here, integrative proteomic and transcriptomic analyses were employed to identify pathogenesis-related protein genes by comparing differentially expressed proteins (DEPs) and differentially expressed genes (DEGs) in maize stalks after inoculation with F. verticillioides. Functional enrichment analysis showed that DEGs and DEPs were mainly enriched in glutathione metabolism, starch and sucrose metabolism, amino sugar and nucleotide sugar metabolism, linoleic acid metabolism, and phenylpropanoid biosynthesis. Fourteen DEGs and DEGs that were highly elevated after inoculation with F. verticillioides were confirmed with parallel reaction monitoring and reverse transcription-quantitative PCR, demonstrating the accountability and reliability of proteomic and transcriptomic data. We also assessed the potential roles of defence-related genes ZmCTA1, ZmWIP1, and ZmLOX2, identified from the multi-omics analysis, during the process of F. verticillioides infection through virus-induced gene silencing. The elevation of stalk rot symptomatic characteristics in the silenced plants revealed their contribution to resistance. We further functionally characterized the roles of ZmLOX2 expression in the defence response of maize plants conditioning fungal invasion via the salicylic acid-dependent pathway. Collectively, this study provides a comprehensive analysis of transcriptome and proteome of maize stalks following F. verticillioides inoculation, and defence-related genes that could inform selection of new genes as targets in breeding strategies.
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Affiliation(s)
- Lili Zhang
- Institute of Crop SciencesChinese Academy of Agricultural SciencesBeijingChina
- Institute of Cereal CropsHenan Academy of Agricultural SciencesZhengzhouChina
- College of AgronomyHenan Agricultural UniversityZhengzhouChina
| | - Mengwei Hou
- Institute of Cereal CropsHenan Academy of Agricultural SciencesZhengzhouChina
| | - Xingrui Zhang
- Institute of Crop SciencesChinese Academy of Agricultural SciencesBeijingChina
| | - Yanyong Cao
- Institute of Cereal CropsHenan Academy of Agricultural SciencesZhengzhouChina
- The Shennong LaboratoryZhengzhouChina
| | - Suli Sun
- Institute of Crop SciencesChinese Academy of Agricultural SciencesBeijingChina
| | - Zhendong Zhu
- Institute of Crop SciencesChinese Academy of Agricultural SciencesBeijingChina
| | - Shengbo Han
- Institute of Cereal CropsHenan Academy of Agricultural SciencesZhengzhouChina
- College of AgronomyHenan Agricultural UniversityZhengzhouChina
| | - Yanhui Chen
- College of AgronomyHenan Agricultural UniversityZhengzhouChina
| | - Lixia Ku
- College of AgronomyHenan Agricultural UniversityZhengzhouChina
- The Shennong LaboratoryZhengzhouChina
| | - Canxing Duan
- Institute of Crop SciencesChinese Academy of Agricultural SciencesBeijingChina
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Yu L, Zhang H, Guan R, Li Y, Guo Y, Qiu L. Genome-Wide Tissue-Specific Genes Identification for Novel Tissue-Specific Promoters Discovery in Soybean. Genes (Basel) 2023; 14:1150. [PMID: 37372330 DOI: 10.3390/genes14061150] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2023] [Revised: 05/18/2023] [Accepted: 05/23/2023] [Indexed: 06/29/2023] Open
Abstract
Promoters play a crucial role in controlling the spatial and temporal expression of genes at transcriptional levels in the process of higher plant growth and development. The spatial, efficient, and correct regulation of exogenous genes expression, as desired, is the key point in plant genetic engineering research. Constitutive promoters widely used in plant genetic transformation are limited because, sometimes, they may cause potential negative effects. This issue can be solved, to a certain extent, by using tissue-specific promoters. Compared with constitutive promoters, a few tissue-specific promoters have been isolated and applied. In this study, based on the transcriptome data, a total of 288 tissue-specific genes were collected, expressed in seven tissues, including the leaves, stems, flowers, pods, seeds, roots, and nodules of soybean (Glycine max). KEGG pathway enrichment analysis was carried out, and 52 metabolites were annotated. A total of 12 tissue-specific genes were selected via the transcription expression level and validated through real-time quantitative PCR, of which 10 genes showed tissue-specific expression. The 3-kb 5' upstream regions of ten genes were obtained as putative promoters. Further analysis showed that all the 10 promoters contained many tissue-specific cis-elements. These results demonstrate that high-throughput transcriptional data can be used as effective tools, providing a guide for high-throughput novel tissue-specific promoter discovery.
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Affiliation(s)
- Lili Yu
- The National Key Facility for Crop Gene Resources and Genetic Improvement (NFCRI)/Key Laboratory of Grain Crop Genetic Resources Evaluation and Utilization, Institute of Crop Sciences, Chinese Academy of Agricultural Sciences, Beijing 100081, China
| | - Hao Zhang
- The National Key Facility for Crop Gene Resources and Genetic Improvement (NFCRI)/Key Laboratory of Grain Crop Genetic Resources Evaluation and Utilization, Institute of Crop Sciences, Chinese Academy of Agricultural Sciences, Beijing 100081, China
| | - Rongxia Guan
- The National Key Facility for Crop Gene Resources and Genetic Improvement (NFCRI)/Key Laboratory of Grain Crop Genetic Resources Evaluation and Utilization, Institute of Crop Sciences, Chinese Academy of Agricultural Sciences, Beijing 100081, China
| | - Yinghui Li
- The National Key Facility for Crop Gene Resources and Genetic Improvement (NFCRI)/Key Laboratory of Grain Crop Genetic Resources Evaluation and Utilization, Institute of Crop Sciences, Chinese Academy of Agricultural Sciences, Beijing 100081, China
| | - Yong Guo
- The National Key Facility for Crop Gene Resources and Genetic Improvement (NFCRI)/Key Laboratory of Grain Crop Genetic Resources Evaluation and Utilization, Institute of Crop Sciences, Chinese Academy of Agricultural Sciences, Beijing 100081, China
| | - Lijuan Qiu
- The National Key Facility for Crop Gene Resources and Genetic Improvement (NFCRI)/Key Laboratory of Grain Crop Genetic Resources Evaluation and Utilization, Institute of Crop Sciences, Chinese Academy of Agricultural Sciences, Beijing 100081, China
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Sun Y, Qin Q, Song K, Sun L, Jiang T, Yang S, Li Z, Xu G, Sun S, Xue Y. Does Sulfoquinovosyl Diacylglycerol Synthase OsSQD1 Affect the Composition of Lipids in Rice Phosphate-Deprived Root? Int J Mol Sci 2022; 24:ijms24010114. [PMID: 36613553 PMCID: PMC9820689 DOI: 10.3390/ijms24010114] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2022] [Revised: 12/11/2022] [Accepted: 12/12/2022] [Indexed: 12/24/2022] Open
Abstract
Lipids are the essential components of the cell intracellular and plasma membranes. Sulfoquinovosyldiacylglycerol (SQDG) is a glycolipid; glycolipids can replace phospholipids in maintaining phosphate (Pi) homeostasis in plants which are undergoing Pi starvation. Sulfoquinovosyl diacylglycerol synthase 1 (OsSQD1) is a critical enzyme in the first step of catalyzation in the formation of SQDG in rice. In this study, the expression pattern of different zones in roots of OsSQD1 in response to different Pi conditions is examined, and it is found that OsSQD1 is highly expressed in lateral roots under Pi-sufficient and -deficient conditions. The root phenotype observation of different OsSQD1 transgenic lines suggests that the knockout/down of OsSQD1 inhibits the formation and growth of lateral roots under different Pi conditions. Additionally, the lipid concentrations in OsSQD1 transgenic line roots indicate that OsSQD1 knockout/down decreases the concentration of phospholipids and glycolipids in Pi-starved roots. The OsSQD1 mutation also changes the composition of different lipid species with different acyl chain lengths, mainly under Pi-deprived conditions. The relative transcript expression of genes relating to glycolipid synthesis and phospholipid degradation is estimated to help study the mechanism by which OsSQD1 exerts an influence on the alteration of lipid composition and concentration in Pi-starved roots. Moreover, in Pi-starved roots, the knockout of OsSQD1 decreases the unsaturated fatty acid content of phospholipids and glycolipids. To summarize, the present study demonstrates that OsSQD1 plays a key role in the maintenance of phospholipid and glycolipid composition in Pi-deprived rice roots, which may influence root growth and development under Pi-deprived conditions.
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Affiliation(s)
- Yafei Sun
- Institute of Eco-Environment and Plant Protection, Shanghai Academy of Agricultural Sciences, Shanghai 201403, China
- Shanghai Key Laboratory of Protected Horticultural Technology, Shanghai Academy of Agricultural Sciences, Shanghai 201403, China
- Key Laboratory of Low-Carbon Green Agriculture, Ministry of Agriculture and Rural Affairs, Shanghai 201403, China
| | - Qin Qin
- Institute of Eco-Environment and Plant Protection, Shanghai Academy of Agricultural Sciences, Shanghai 201403, China
- Shanghai Key Laboratory of Protected Horticultural Technology, Shanghai Academy of Agricultural Sciences, Shanghai 201403, China
- Key Laboratory of Low-Carbon Green Agriculture, Ministry of Agriculture and Rural Affairs, Shanghai 201403, China
| | - Ke Song
- Institute of Eco-Environment and Plant Protection, Shanghai Academy of Agricultural Sciences, Shanghai 201403, China
- Shanghai Key Laboratory of Protected Horticultural Technology, Shanghai Academy of Agricultural Sciences, Shanghai 201403, China
- Key Laboratory of Low-Carbon Green Agriculture, Ministry of Agriculture and Rural Affairs, Shanghai 201403, China
| | - Lijuan Sun
- Institute of Eco-Environment and Plant Protection, Shanghai Academy of Agricultural Sciences, Shanghai 201403, China
- Shanghai Key Laboratory of Protected Horticultural Technology, Shanghai Academy of Agricultural Sciences, Shanghai 201403, China
- Key Laboratory of Low-Carbon Green Agriculture, Ministry of Agriculture and Rural Affairs, Shanghai 201403, China
| | - Tingting Jiang
- Key Laboratory of Plant Nutrition and Fertilization in Low-Middle Reaches of the Yangtze River, Ministry of Agriculture, Nanjing Agricultural University, Nanjing 210095, China
| | - Shiyan Yang
- Institute of Eco-Environment and Plant Protection, Shanghai Academy of Agricultural Sciences, Shanghai 201403, China
- Shanghai Key Laboratory of Protected Horticultural Technology, Shanghai Academy of Agricultural Sciences, Shanghai 201403, China
- Key Laboratory of Low-Carbon Green Agriculture, Ministry of Agriculture and Rural Affairs, Shanghai 201403, China
| | - Zhouwen Li
- Institute of Eco-Environment and Plant Protection, Shanghai Academy of Agricultural Sciences, Shanghai 201403, China
- Shanghai Key Laboratory of Protected Horticultural Technology, Shanghai Academy of Agricultural Sciences, Shanghai 201403, China
- Key Laboratory of Low-Carbon Green Agriculture, Ministry of Agriculture and Rural Affairs, Shanghai 201403, China
| | - Guohua Xu
- Key Laboratory of Plant Nutrition and Fertilization in Low-Middle Reaches of the Yangtze River, Ministry of Agriculture, Nanjing Agricultural University, Nanjing 210095, China
| | - Shubin Sun
- Key Laboratory of Plant Nutrition and Fertilization in Low-Middle Reaches of the Yangtze River, Ministry of Agriculture, Nanjing Agricultural University, Nanjing 210095, China
- Correspondence: (S.S.); (Y.X.)
| | - Yong Xue
- Institute of Eco-Environment and Plant Protection, Shanghai Academy of Agricultural Sciences, Shanghai 201403, China
- Shanghai Key Laboratory of Protected Horticultural Technology, Shanghai Academy of Agricultural Sciences, Shanghai 201403, China
- Key Laboratory of Low-Carbon Green Agriculture, Ministry of Agriculture and Rural Affairs, Shanghai 201403, China
- Correspondence: (S.S.); (Y.X.)
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Liu S, Liu C, Wang X, Chen H. Seed-specific activity of the Arabidopsis β-glucosidase 19 promoter in transgenic Arabidopsis and tobacco. PLANT CELL REPORTS 2021; 40:213-221. [PMID: 33099669 DOI: 10.1007/s00299-020-02627-8] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/06/2020] [Accepted: 10/10/2020] [Indexed: 05/09/2023]
Abstract
KEY MESSAGE The promoter of the Arabidopsis thaliana β-glucosidase 19 gene directs GUS expression in a seed-specific manner in transgenic Arabidopsis and tobacco. In the present study, an 898-bp putative promoter of the Arabidopsis β-glucosidase 19 (AtBGLU19) gene was cloned. The bioinformatics analysis of the cis-acting elements indicated that this putative promoter contains many seed-specific elements, such as RY elements. The features of this promoter fragment were evaluated for the capacity to direct the β-glucuronidase (GUS) reporter gene in transgenic Arabidopsis and tobacco. Histochemical and fluorometric GUS analyses of transgenic Arabidopsis plants revealed that the AtBGLU19 promoter directed strong GUS activity in late-maturing seeds and dry seeds, whereas no GUS expression was observed in other organs. The results indicated that the AtBGLU19 promoter was able to direct GUS expression in a seed-specific manner in transgenic Arabidopsis. In tobacco, the intensity of the staining and the level of GUS activity were considerably higher in the seeds than in the other tissues. These results further confirmed that the AtBGLU19 promoter is seed specific and can be used to control transgene expression in a heterologous plant system.
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Affiliation(s)
- Shijuan Liu
- School of Life Science, Qufu Normal University, Qufu, 273165, China.
| | - Changju Liu
- School of Life Science, Qufu Normal University, Qufu, 273165, China
| | - Xue Wang
- School of Life Science, Qufu Normal University, Qufu, 273165, China
| | - Huiqing Chen
- School of Life Science, Qufu Normal University, Qufu, 273165, China
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Hajiahmadi Z, Shirzadian-Khorramabad R, Kazemzad M, Sohani MM, Khajehali J. A novel, simple, and stable mesoporous silica nanoparticle-based gene transformation approach in Solanum lycopersicum. 3 Biotech 2020; 10:370. [PMID: 32832330 DOI: 10.1007/s13205-020-02359-2] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2019] [Accepted: 07/25/2020] [Indexed: 11/25/2022] Open
Abstract
In this study, a novel and stable gene transformation system was developed under control of Maize Proteinase Inhibitor (MPI) as an inducible promoter using the Mesoporous Silica Nanoparticles (MSNs). The functionalized MSNs with a proper particle size were synthesized and attached to a recombinant construct (pDNA) containing cryIAb gene under the control of MPI promoter (pPZP122:MPI:cryIAb:MSN [pDNA: MSN]) following transformation of tomato plants through injection of the pDNA: MSN complex into tomato red fruit at early ripening stage and then, putative transgenic seeds were collected. As an initial selection, gentamicin-resistant seedlings of T1 (24.24%) and T2 (61.37%) plants were identified. The transgene integration and expression were confirmed through the PCR, RT-PCR, and western blot approaches in the selected seedlings. PCR analysis showed that transformation frequency was equal to 10.71% in T1 plants. Semi-quantitative RT-PCR analysis confirmed the transcript expression of cryIAb in all the T1 and T2 PCR-positive plants. Western blot analysis confirmed the existence of CryIAb protein in the leaves of T2 putative transgenic plants. Accordingly, the results demonstrated that the transgene has more likely integrated into the tomato genome through homologous recombination. Bioassay was carried out for further assessment of the plant responses to Tuta absoluta resulting in an enhanced tolerance of the plant. In conclusion, the MSN-mediated stable transformation system under the MPI as an inducible promoter can be used as a suitable alternative for conventional genetic transformation methods due to its biodegradability, biocompatibility, cost and time-effectiveness, and positive effect on the plant defense against pathogens and pests.
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Affiliation(s)
- Zahra Hajiahmadi
- Department of Agricultural Biotechnology, Faculty of Agricultural Sciences, University of Guilan, Rasht, 4199613776 Iran
| | - Reza Shirzadian-Khorramabad
- Department of Agricultural Biotechnology, Faculty of Agricultural Sciences, University of Guilan, Rasht, 4199613776 Iran
| | - Mahmood Kazemzad
- Department of Energy, Materials and Energy Research Center, Tehran, 14155-477 Iran
| | - Mohammad Mehdi Sohani
- Department of Agricultural Biotechnology, Faculty of Agricultural Sciences, University of Guilan, Rasht, 4199613776 Iran
| | - Jahangir Khajehali
- Department of Plant Protection, College of Agriculture, Isfahan University of Technology, Isfahan, 8415683111 Iran
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Pandey SP, Singh AP, Srivastava S, Chandrashekar K, Sane AP. A strong early acting wound-inducible promoter, RbPCD1pro, activates cryIAc expression within minutes of wounding to impart efficient protection against insects. PLANT BIOTECHNOLOGY JOURNAL 2019; 17:1458-1470. [PMID: 30623549 PMCID: PMC6576099 DOI: 10.1111/pbi.13071] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 03/21/2017] [Accepted: 12/12/2018] [Indexed: 06/09/2023]
Abstract
The expression of insecticidal proteins under constitutive promoters in transgenic plants is fraught with problems like developmental abnormalities, yield drag, expression in unwanted tissues, and seasonal changes in expression. RbPCD1pro, a rapid, early acting wound-inducible promoter from rose that is activated within 5 min of wounding, was isolated and characterized. Wounding increased transcript levels up to 150 and 500 folds within 5 and 20 min coupled with high translation as seen by histochemical GUS enzyme activity within 5-20 min. RbPCD1pro was activated by both sucking and chewing insects and showed wound-inducible expression in various aerial tissues of plants representing commercially important dicot and monocot families. The promoter showed no expression in any vegetative tissue except upon wounding. Functionality of RbPCD1pro was tested by its ability to drive expression of the insecticidal protein gene cryIAc in transgenic Arabidopsis and tomato. Strong wound-inducible CryIAc expression was observed in both plants that increased 100-350 fold (Arabidopsis) and 280-600 fold (tomato) over the unwounded background within 5 min and over 1000-1600 fold within 20 min. The unwounded background level was just 3-6% of the CaMV35S promoter while wound-induced expression was 5-27 folds higher than the best CaMV35S line in just 5 min and 80-fold higher in 20 min. Transgenic plants showed strong resistance even to larger fourth instar larvae of H. armigera and no abnormalities in development and general plant growth. This is one of the earliest acting promoters with wide biotechnological application across monocot and dicot plants.
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Affiliation(s)
- Saurabh Prakash Pandey
- Plant Gene Expression LabCSIR‐National Botanical Research InstituteLucknowIndia
- Academy of Scientific and Innovative Research (AcSIR)GhaziabadIndia
| | - Amar Pal Singh
- Plant Gene Expression LabCSIR‐National Botanical Research InstituteLucknowIndia
- Present address:
National Institute for Plant Genome ResearchNew Delhi110067India
| | - Shruti Srivastava
- Plant Gene Expression LabCSIR‐National Botanical Research InstituteLucknowIndia
| | - Krishnappa Chandrashekar
- Genomics and Molecular Biology DivisionCSIR‐National Botanical Research InstituteLucknowIndia
- Present address:
IARI Regional CentreAundh, Pune411067India
| | - Aniruddha P. Sane
- Plant Gene Expression LabCSIR‐National Botanical Research InstituteLucknowIndia
- Academy of Scientific and Innovative Research (AcSIR)GhaziabadIndia
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Wang Q, Zhu Y, Sun L, Li L, Jin S, Zhang X. Transgenic Bt cotton driven by the green tissue-specific promoter shows strong toxicity to lepidopteran pests and lower Bt toxin accumulation in seeds. SCIENCE CHINA-LIFE SCIENCES 2016; 59:172-82. [PMID: 26728504 DOI: 10.1007/s11427-015-4920-6] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/14/2015] [Accepted: 07/20/2015] [Indexed: 11/29/2022]
Abstract
A promoter of the PNZIP (Pharbitis nil leucine zipper) gene (1.459 kb) was cloned from Pharbitis nil and fused to the GUS (β-glucuronidase) and Bacillus thuringiensis endotoxin (Cry9C) genes. Several transgenic PNZIP::GUS and PNZIP::Cry9C cotton lines were developed by Agrobacterium-mediated transformation. Strong GUS staining was detected in the green tissues of the transgenic PNZIP::GUS cotton plants. In contrast, GUS staining in the reproductive structures such as petals, anther, and immature seeds of PNZIP::GUS cotton was very faint. Two transgenic PNZIP::Cry9C lines and one transgenic cauliflower mosaic virus (CaMV) 35S::Cry9C line were selected for enzyme-linked immunosorbent assay (ELISA) and insect bioassays. Expression of the Cry9C protein in the 35S::Cry9C line maintained a high level in most tissues ranging from 24.6 to 45.5 μg g(-1) fresh weight. In green tissues such as the leaves, boll rinds, and bracts of the PNZIP::Cry9C line, the Cry9C protein accumulated up to 50.2, 39.7, and 48.3 μg g(-1) fresh weight respectively. In contrast, seeds of the PNZIP::Cry9C line (PZ1.3) accumulated only 0.26 μg g(-1) fresh weight of the Cry9C protein, which was 100 times lower than that recorded for the seeds of the CaMV 35S::Cry9C line. The insect bioassay showed that the transgenic PNZIP::Cry9C cotton plant exhibited strong resistance to both the cotton bollworm and the pink bollworm. The PNZIP promoter could effectively drive Bt toxin expression in green tissues of cotton and lower accumulated levels of the Bt protein in seeds. These features should allay public concerns about the safety of transgenic foods. We propose the future utility of PNZIP as an economical, environmentally friendly promoter in cotton biotechnology.
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Affiliation(s)
- Qing Wang
- National Key Laboratory of Crop Genetic Improvement, Huazhong Agricultural University, Wuhan, 430070, China
| | - Yi Zhu
- National Key Laboratory of Crop Genetic Improvement, Huazhong Agricultural University, Wuhan, 430070, China
| | - Lin Sun
- National Key Laboratory of Crop Genetic Improvement, Huazhong Agricultural University, Wuhan, 430070, China
| | - Lebin Li
- National Key Laboratory of Crop Genetic Improvement, Huazhong Agricultural University, Wuhan, 430070, China
| | - Shuangxia Jin
- National Key Laboratory of Crop Genetic Improvement, Huazhong Agricultural University, Wuhan, 430070, China.
| | - Xianlong Zhang
- National Key Laboratory of Crop Genetic Improvement, Huazhong Agricultural University, Wuhan, 430070, China
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