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Yang Y, Chaffin TA, Shao Y, Balasubramanian VK, Markillie M, Mitchell H, Rubio‐Wilhelmi MM, Ahkami AH, Blumwald E, Neal Stewart C. Novel synthetic inducible promoters controlling gene expression during water-deficit stress with green tissue specificity in transgenic poplar. PLANT BIOTECHNOLOGY JOURNAL 2024; 22:1596-1609. [PMID: 38232002 PMCID: PMC11123411 DOI: 10.1111/pbi.14289] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/06/2023] [Revised: 11/16/2023] [Accepted: 01/03/2024] [Indexed: 01/19/2024]
Abstract
Synthetic promoters may be designed using short cis-regulatory elements (CREs) and core promoter sequences for specific purposes. We identified novel conserved DNA motifs from the promoter sequences of leaf palisade and vascular cell type-specific expressed genes in water-deficit stressed poplar (Populus tremula × Populus alba), collected through low-input RNA-seq analysis using laser capture microdissection. Hexamerized sequences of four conserved 20-base motifs were inserted into each synthetic promoter construct. Two of these synthetic promoters (Syn2 and Syn3) induced GFP in transformed poplar mesophyll protoplasts incubated in 0.5 M mannitol solution. To identify effect of length and sequence from a valuable 20 base motif, 5' and 3' regions from a basic sequence (GTTAACTTCAGGGCCTGTGG) of Syn3 were hexamerized to generate two shorter synthetic promoters, Syn3-10b-1 (5': GTTAACTTCA) and Syn3-10b-2 (3': GGGCCTGTGG). These promoters' activities were compared with Syn3 in plants. Syn3 and Syn3-10b-1 were specifically induced in transient agroinfiltrated Nicotiana benthamiana leaves in water cessation for 3 days. In stable transgenic poplar, Syn3 presented as a constitutive promoter but had the highest activity in leaves. Syn3-10b-1 had stronger induction in green tissues under water-deficit stress conditions than mock control. Therefore, a synthetic promoter containing the 5' sequence of Syn3 endowed both tissue-specificity and water-deficit inducibility in transgenic poplar, whereas the 3' sequence did not. Consequently, we have added two new synthetic promoters to the poplar engineering toolkit: Syn3-10b-1, a green tissue-specific and water-deficit stress-induced promoter, and Syn3, a green tissue-preferential constitutive promoter.
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Affiliation(s)
- Yongil Yang
- Center for Agricultural Synthetic BiologyUniversity of Tennessee Institute of AgricultureKnoxvilleTennesseeUSA
| | - Timothy A. Chaffin
- Center for Agricultural Synthetic BiologyUniversity of Tennessee Institute of AgricultureKnoxvilleTennesseeUSA
| | - Yuanhua Shao
- Center for Agricultural Synthetic BiologyUniversity of Tennessee Institute of AgricultureKnoxvilleTennesseeUSA
- Department of Plant SciencesUniversity of TennesseeKnoxvilleTennesseeUSA
| | | | - Meng Markillie
- Environmental Molecular Sciences Laboratory, Pacific Northwest National LaboratoryRichlandWAUSA
| | - Hugh Mitchell
- Environmental Molecular Sciences Laboratory, Pacific Northwest National LaboratoryRichlandWAUSA
| | | | - Amir H. Ahkami
- Environmental Molecular Sciences Laboratory, Pacific Northwest National LaboratoryRichlandWAUSA
| | - Eduardo Blumwald
- Department of Plant SciencesUniversity of CaliforniaDavisCaliforniaUSA
| | - C. Neal Stewart
- Center for Agricultural Synthetic BiologyUniversity of Tennessee Institute of AgricultureKnoxvilleTennesseeUSA
- Department of Plant SciencesUniversity of TennesseeKnoxvilleTennesseeUSA
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Particle bombardment technology and its applications in plants. Mol Biol Rep 2020; 47:9831-9847. [PMID: 33222118 DOI: 10.1007/s11033-020-06001-5] [Citation(s) in RCA: 20] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2020] [Accepted: 11/11/2020] [Indexed: 12/15/2022]
Abstract
Particle bombardment, or biolistics, has emerged as an excellent alternative approach for plant genetic transformation which circumvents the limitations of Agrobacterium-mediated genetic transformation. The method has no biological constraints and can transform a wide range of plant species. Besides, it has been the most efficient way to achieve organelle transformation (for both chloroplasts and mitochondria) so far. Along with the recent advances in genome editing technologies, conventional gene delivery tools are now being repurposed to deliver targeted gene editing reagents into the plants. One of the key advantages is that the particle bombardment allows DNA-free gene editing of the genome. It enables the direct delivery of proteins, RNAs, and RNPs into plants. Owing to the versatility and wide-range applicability of the particle bombardment, it will likely remain one of the major genetic transformation methods in the future. This article provides an overview of the current status of particle bombardment technology and its applications in the field of plant research and biotechnology.
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Li D, Xu R, Lv D, Zhang C, Yang H, Zhang J, Wen J, Li C, Tan X. Identification of the Core Pollen-Specific Regulation in the Rice OsSUT3 Promoter. Int J Mol Sci 2020; 21:ijms21061909. [PMID: 32168778 PMCID: PMC7139308 DOI: 10.3390/ijms21061909] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2020] [Revised: 03/06/2020] [Accepted: 03/09/2020] [Indexed: 02/02/2023] Open
Abstract
The regulatory mechanisms of pollen development have potential value for applications in agriculture, such as better understanding plant reproductive regularity. Pollen-specific promoters are of vital importance for the ectopic expression of functional genes associated with pollen development in plants. However, there is a limited number of successful applications using pollen-specific promoters in genetic engineering for crop breeding and hybrid generation. Our previous work led to the identification and isolation of the OsSUT3 promoter from rice. In this study, to analyze the effects of different putative regulatory motifs in the OsSUT3 promoter, a series of promoter deletions were fused to a GUS reporter gene and then stably introduced into rice and Arabidopsis. Histochemical GUS analysis of transgenic plants revealed that p385 (from -385 to -1) specifically mediated maximal GUS expression in pollen tissues. The S region (from -385 to -203) was the key region for controlling the pollen-specific expression of a downstream gene. The E1 (-967 to -606), E2 (-202 to -120), and E3 (-119 to -1) regions enhanced ectopic promoter activity to different degrees. Moreover, the p385 promoter could alter the expression pattern of the 35S promoter and improve its activity when they were fused together. In summary, the p385 promoter, a short and high-activity promoter, can function to drive pollen-specific expression of transgenes in monocotyledon and dicotyledon transformation experiments.
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Affiliation(s)
- Dandan Li
- State Key Laboratory for Conservation and Utilization of Bio-Resources in Yunnan, Yunnan Agricultural University, Kunming 650201, Yunnan, China
- Post-Doctoral Research Station of Plant Protection as first class discipline, Yunnan Agricultural University, Kunming 650201, Yunnan, China
| | - Rucong Xu
- Rice Research Institute, Yunnan Agricultural University, Kunming 650201, Yunnan, China
| | - Dong Lv
- Rice Research Institute, Yunnan Agricultural University, Kunming 650201, Yunnan, China
| | - Chunlong Zhang
- Rice Research Institute, Yunnan Agricultural University, Kunming 650201, Yunnan, China
| | - Hong Yang
- Rice Research Institute, Yunnan Agricultural University, Kunming 650201, Yunnan, China
| | - Jianbo Zhang
- Rice Research Institute, Yunnan Agricultural University, Kunming 650201, Yunnan, China
| | - Jiancheng Wen
- Rice Research Institute, Yunnan Agricultural University, Kunming 650201, Yunnan, China
| | - Chengyun Li
- State Key Laboratory for Conservation and Utilization of Bio-Resources in Yunnan, Yunnan Agricultural University, Kunming 650201, Yunnan, China
- Post-Doctoral Research Station of Plant Protection as first class discipline, Yunnan Agricultural University, Kunming 650201, Yunnan, China
- Correspondence: (C.L.); (X.T.); Tel.: +86-0871-6522-7552 (C.L.); +86-0871-6522-7063 (X.T.)
| | - Xuelin Tan
- Rice Research Institute, Yunnan Agricultural University, Kunming 650201, Yunnan, China
- Yunnan Engineering Research Center for Japonica Hybrid Rice, Kunming 650201, Yunnan, China
- Correspondence: (C.L.); (X.T.); Tel.: +86-0871-6522-7552 (C.L.); +86-0871-6522-7063 (X.T.)
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Geetha S, Joshi JB, Kumar KK, Arul L, Kokiladevi E, Balasubramanian P, Sudhakar D. Genetic transformation of tropical maize ( Zea mays L.) inbred line with a phytase gene from Aspergillus niger. 3 Biotech 2019; 9:208. [PMID: 31093478 DOI: 10.1007/s13205-019-1731-7] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2018] [Accepted: 04/25/2019] [Indexed: 10/26/2022] Open
Abstract
A full-length cDNA of phyA gene of Aspergillus niger, encoding phytase enzyme, was cloned and expressed in E. coli BL21 cells and assayed for its activity. The phyA cDNA consisted of 1404 bp, which encoded 467 amino acid residues. The phytase activity of purified phytase was 826.33 U/mL. The phyA gene under the control of endosperm-specific promoters was transformed into an Indian maize inbred line, UMI29, using particle bombardment-mediated transformation method to generate transgenic maize plants over-expressing phytase in seeds. PCR and GUS analyses demonstrated the presence of transgenes in T0 transgenic plants and their stable inheritance in the T1 progenies. Three transgenic events expressing detectable level of A. niger phytase were characterized by western blot analysis. Phytase activity of 463.158 U/kg of seed was observed in one of the events, JB-UMI29-Z17/2. The phytase activity of transgenic maize seeds was 5.5- to 7-fold higher than the wild-type UMI29 seeds and, consequently, the seeds had 0.6- to 5-fold higher inorganic phosphorus content.
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Li H, Li J, Xu R, Qin R, Song F, Li L, Wei P, Yang J. Isolation of five rice nonendosperm tissue-expressed promoters and evaluation of their activities in transgenic rice. PLANT BIOTECHNOLOGY JOURNAL 2018; 16:1138-1147. [PMID: 29105251 PMCID: PMC5978396 DOI: 10.1111/pbi.12858] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 05/03/2017] [Revised: 10/17/2017] [Accepted: 10/28/2017] [Indexed: 06/07/2023]
Abstract
Using promoters expressed in nonendosperm tissues to activate target genes in specific plant tissues or organs with very limited expression in the endosperm is an attractive approach in crop transgenic engineering. In this article, five putative nonendosperm tissue-expressed promoters were cloned from the rice genome and designated POsNETE1 , POsNETE2 , POsNETE3 , POsNETE4 and POsNETE5 . By qualitatively and quantitatively examining GUSplus reporter gene expression in transgenic rice plants, POsNETE1 -POsNETE5 were all found to be active in the roots, leaves, stems, sheaths and panicles but not in the endosperm of plants at different developmental stages. In addition, POsNETE2 , POsNETE4 and POsNETE5 were also inactive in rice embryos. Among these promoters, POsNETE4 and POsNETE5 exhibited higher activities in all of the tested tissues, and their activities in stems, leaves, roots and sheaths were higher than or comparable to those of the rice Actin1 promoter. We also progressively monitored the activities of POsNETE1 -POsNETE5 in two generations of single-copy lines and found that these promoters were stably expressed between generations. Transgenic rice was produced using POsNETE4 and POsNETE5 to drive a modified Bt gene, mCry1Ab. Bt protein expressed in the tested plants ranged from 1769.4 to 4428.8 ng/g fresh leaves, whereas Bt protein was barely detected in the endosperm. Overall, our study identified five novel nonendosperm tissue-expressed promoters that might be suitable for rice genetic engineering and might reduce potential social concern regarding the safety of GMO crops.
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Affiliation(s)
- Hao Li
- Key Laboratory of Rice Genetic Breeding of Anhui ProvinceRice Research InstituteAnhui Academy of Agricultural SciencesHefeiChina
| | - Juan Li
- Key Laboratory of Rice Genetic Breeding of Anhui ProvinceRice Research InstituteAnhui Academy of Agricultural SciencesHefeiChina
| | - Rongfang Xu
- Key Laboratory of Rice Genetic Breeding of Anhui ProvinceRice Research InstituteAnhui Academy of Agricultural SciencesHefeiChina
| | - Ruiying Qin
- Key Laboratory of Rice Genetic Breeding of Anhui ProvinceRice Research InstituteAnhui Academy of Agricultural SciencesHefeiChina
| | - Fengshun Song
- Key Laboratory of Rice Genetic Breeding of Anhui ProvinceRice Research InstituteAnhui Academy of Agricultural SciencesHefeiChina
| | - Li Li
- Key Laboratory of Rice Genetic Breeding of Anhui ProvinceRice Research InstituteAnhui Academy of Agricultural SciencesHefeiChina
| | - Pengcheng Wei
- Key Laboratory of Rice Genetic Breeding of Anhui ProvinceRice Research InstituteAnhui Academy of Agricultural SciencesHefeiChina
| | - Jianbo Yang
- Key Laboratory of Rice Genetic Breeding of Anhui ProvinceRice Research InstituteAnhui Academy of Agricultural SciencesHefeiChina
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