scholarly journals Transgenic plants expressing ω-ACTX-Hv1a and snowdrop lectin (GNA) fusion protein show enhanced resistance to aphids

2014 ◽  
Vol 5 ◽  
Author(s):  
Erich Y. T. Nakasu ◽  
Martin G. Edwards ◽  
Elaine Fitches ◽  
John A. Gatehouse ◽  
Angharad M. R. Gatehouse
Keyword(s):  
Transgenic Plants ◽  
Fusion Protein ◽  
Enhanced Resistance

Transgenic plants expressing the AaIT/GNA fusion protein show increased resistance and toxicity to both chewing and sucking pests

2015 ◽  
Vol 23 (2) ◽  
pp. 265-276 ◽  
Author(s):  
Shu-Min Liu ◽  
Jie Li ◽  
Jin-Qi Zhu ◽  
Xiao-Wei Wang ◽  
Cheng-Shu Wang ◽  
...  
Keyword(s):  
Transgenic Plants ◽  
Fusion Protein

Transgenic tobacco expressing an Arisaema heterophyllum agglutinin gene displays enhanced resistance to aphids

2004 ◽  
Vol 84 (3) ◽  
pp. 785-790 ◽  
Author(s):  
Jianhong Yao, Xiuyun Zhao ◽  
Huaxiong Qi, Bingliang Wan ◽  
Fei Chen, Xiaofen Sun ◽  
Shanqian Yu ◽  
Kexuan Tang
Keyword(s):  
Transgenic Plants ◽  
Transgenic Tobacco ◽  
Myzus Persicae ◽  
Transgenic Tobacco Plants ◽  
Insect Bioassay ◽  
Tobacco Plants ◽  
Potato Aphid ◽  
Enhanced Resistance ◽  
Multiple Copies ◽  
Peach Potato Aphid

Tobacco leaf discs were transformed with a plasmid, pBIAHA, containing the selectable marker neomycin phosphotransferase gene (nptII) and an Arisaema heterophyllum agglutinin gene (aha) via Agrobacterium tumefaciens-mediated transformation. Thirty-two independent transgenic tobacco plants were regenerated. PCR and Southern blot analyses confirmed that multiple copies of the aha gene had integrated into the plant genome. Northern blot analysis revealed that the aha gene was expressed at various levels in the transgenic plants. Insect bioassay test showed that transgenic plants expressing multiple copies of the aha gene reduced the rate of population increase of the peach potato aphid (Myzus persicae Sulzer). This is the first report that transgenic tobacco plants expressing the aha gene display enhanced resistance to aphids. Key words: Insect bioassay, Arisaema heterophyllum agglutinin, transformation, transgenic tobacco, peach potato aphid (Myzus persicae Sulzer)

scholarly journals Enhanced Resistance to Fusarium graminearum in Transgenic Arabidopsis Plants Expressing a Modified Plant Thionin

2020 ◽  
Vol 110 (5) ◽  
pp. 1056-1066 ◽  
Author(s):  
Guixia Hao ◽  
Matthew G. Bakker ◽  
Hye-Seon Kim
Keyword(s):  
Transgenic Plants ◽  
Fusarium Graminearum ◽  
Transgenic Arabidopsis ◽  
Hyphal Growth ◽  
Marker Genes ◽  
Head Blight ◽  
Transgenic Expression ◽  
Transgenic Arabidopsis Plants ◽  
Enhanced Resistance ◽  
And Control

The fungal pathogen Fusarium graminearum causes Fusarium head blight (FHB) on wheat, barley, and other grains. FHB results in yield reductions and contaminates grain with trichothecene mycotoxins, which threaten food safety and food security. Innovative mechanisms for controlling FHB are urgently needed. We have previously shown that transgenic tobacco and citrus plants expressing a modified thionin (Mthionin) exhibited enhanced resistance toward several bacterial pathogens. The aim of this study was to investigate whether overexpression of Mthionin could be similarly efficacious against F. graminearum, and whether transgenic expression of Mthionin impacts the plant microbiome. Transgenic Arabidopsis plants expressing Mthionin were generated and confirmed. When challenged with F. graminearum, Mthionin-expressing plants showed less disease and fungal biomass in both leaves and inflorescences compared with control plants. When infiltrated into leaves, macroconidia of F. graminearum germinated at lower rates and produced less hyphal growth in Arabidopsis leaves expressing Mthionin. Moreover, marker genes related to defense signaling pathways were expressed at significantly higher levels after F. graminearum infection in Mthionin transgenic Arabidopsis plants. However, Mthionin expression did not appreciably alter the overall microbiome associated with transgenic plants grown under controlled conditions; across leaves and roots of Mthionin-expressing and control transgenic plants, only a few bacterial and fungal taxa differed, and differences between Mthionin transformants were of similar magnitude compared with control plants. In sum, our data indicate that Mthionin is a promising candidate to produce transgenic crops for reducing FHB severity and ultimately mycotoxin contamination.

scholarly journals Expression of an Oxalate Decarboxylase Impairs the Necrotic Effect Induced by Nep1-like Protein (NLP) of Moniliophthora perniciosa in Transgenic Tobacco

2011 ◽  
Vol 24 (7) ◽  
pp. 839-848 ◽  
Author(s):  
Leonardo F. da Silva ◽  
Cristiano V. Dias ◽  
Luciana C. Cidade ◽  
Juliano S. Mendes ◽  
Carlos P. Pirovani ◽  
...  
Keyword(s):  
Cell Death ◽  
Transgenic Plants ◽  
Plant Pathogens ◽  
Oxygen Species ◽  
Oxalate Decarboxylase ◽  
Moniliophthora Perniciosa ◽  
Enhanced Resistance ◽  
Broom Disease ◽  
Ros Formation ◽  
Theobroma Cacao L

Oxalic acid (OA) and Nep1-like proteins (NLP) are recognized as elicitors of programmed cell death (PCD) in plants, which is crucial for the pathogenic success of necrotrophic plant pathogens and involves reactive oxygen species (ROS). To determine the importance of oxalate as a source of ROS for OA- and NLP-induced cell death, a full-length cDNA coding for an oxalate decarboxylase (FvOXDC) from the basidiomycete Flammulina velutipes, which converts OA into CO2 and formate, was overexpressed in tobacco plants. The transgenic plants contained less OA and more formic acid compared with the control plants and showed enhanced resistance to cell death induced by exogenous OA and MpNEP2, an NLP of the hemibiotrophic fungus Moniliophthora perniciosa. This resistance was correlated with the inhibition of ROS formation in the transgenic plants inoculated with OA, MpNEP2, or a combination of both PCD elicitors. Taken together, these results have established a pivotal function for oxalate as a source of ROS required for the PCD-inducing activity of OA and NLP. The results also indicate that FvOXDC represents a potentially novel source of resistance against OA- and NLP-producing pathogens such as M. perniciosa, the causal agent of witches' broom disease of cacao (Theobroma cacao L.).

scholarly journals Copper and nickel resistance at ipt-transgenic potato plants

2004 ◽  
Vol 2 (3) ◽  
pp. 25-31
Author(s):  
Elena A Andreeva ◽  
Ludmila A Lutova
Keyword(s):  
Transgenic Plants ◽  
Copper Sulfate ◽  
Transgenic Potato ◽  
Nickel Chloride ◽  
Nickel Resistance ◽  
Potato Plants ◽  
Agrobacterial Transformation ◽  
Enhanced Resistance ◽  
Transgenic Potato Plants

Using agrobacterial transformation collection of /pr-transgenic plants based on cv. Adretta was obtained. Analysis of transgenic plants susceptibility to the exogenous phytohormones auxin (IAA) and cytokinin (kinetin) for 18 from 22 analyzed forms reveals altered reaction to hormones. Among 18 plants with altered reaction to phytohormones for 16 forms enhanced resistance to copper sulfate and/or nickel chloride was observed

scholarly journals Tomato transgenic plants expressing hairpin construct of a nematode protease gene conferred enhanced resistance to root-knot nematodes

2015 ◽  
Vol 6 ◽  
Author(s):  
Tushar K. Dutta ◽  
Pradeep K. Papolu ◽  
Prakash Banakar ◽  
Divya Choudhary ◽  
Anil Sirohi ◽  
...  
Keyword(s):  
Transgenic Plants ◽  
Protease Gene ◽  
Root Knot Nematodes ◽  
Enhanced Resistance ◽  
Hairpin Construct

scholarly journals Transgenic Tomato Plants Overexpressing Tyramine N-Hydroxycinnamoyltransferase Exhibit Elevated Hydroxycinnamic Acid Amide Levels and Enhanced Resistance to Pseudomonas syringae

2014 ◽  
Vol 27 (10) ◽  
pp. 1159-1169 ◽  
Author(s):  
Laura Campos ◽  
Purificación Lisón ◽  
María Pilar López-Gresa ◽  
Ismael Rodrigo ◽  
Laura Zacarés ◽  
...  
Keyword(s):  
Transgenic Plants ◽  
Pseudomonas Syringae ◽  
Acid Amide ◽  
Hydroxycinnamic Acid ◽  
Transgenic Tomato ◽  
Tomato Plants ◽  
Antibacterial And Antifungal Activities ◽  
Enhanced Resistance ◽  
Transgenic Tomato Plants ◽  
Key Enzyme

Hydroxycinnamic acid amides (HCAA) are secondary metabolites involved in plant development and defense that have been widely reported throughout the plant kingdom. These phenolics show antioxidant, antiviral, antibacterial, and antifungal activities. Hydroxycinnamoyl-CoA:tyramine N-hydroxycinnamoyl transferase (THT) is the key enzyme in HCAA synthesis and is induced in response to pathogen infection, wounding, or elicitor treatments, preceding HCAA accumulation. We have engineered transgenic tomato plants overexpressing tomato THT. These plants displayed an enhanced THT gene expression in leaves as compared with wild type (WT) plants. Consequently, leaves of THT-overexpressing plants showed a higher constitutive accumulation of the amide coumaroyltyramine (CT). Similar results were found in flowers and fruits. Moreover, feruloyltyramine (FT) also accumulated in these tissues, being present at higher levels in transgenic plants. Accumulation of CT, FT and octopamine, and noradrenaline HCAA in response to Pseudomonas syringae pv. tomato infection was higher in transgenic plants than in the WT plants. Transgenic plants showed an enhanced resistance to the bacterial infection. In addition, this HCAA accumulation was accompanied by an increase in salicylic acid levels and pathogenesis-related gene induction. Taken together, these results suggest that HCAA may play an important role in the defense of tomato plants against P. syringae infection.

scholarly journals Expression of GA733-Fc Fusion Protein as a Vaccine Candidate for Colorectal Cancer in Transgenic Plants

2012 ◽  
Vol 2012 ◽  
pp. 1-11 ◽  
Author(s):  
Zhe Lu ◽  
Kyung-Jin Lee ◽  
Yingxue Shao ◽  
Jeong-Hwan Lee ◽  
Yangkang So ◽  
...  
Keyword(s):  
Colorectal Cancer ◽  
Transgenic Plants ◽  
Fusion Protein ◽  
Recombinant Proteins ◽  
Sandwich Elisa ◽  
Surface Glycoprotein ◽  
Glycan Structure ◽  
Protein Accumulation ◽  
Cell Surface Glycoprotein ◽  
Er Retention

The tumor-associated antigen GA733 is a cell-surface glycoprotein highly expressed in colorectal carcinomas. In this study, 3 recombinant genes were constructed as follows: GA733 tagged to the ER retention sequence KDEL (GA733K), GA733 fused to the immunoglobulin Fc fragment (GA733-Fc), and GA733-Fc fused to the ER retention sequence (GA733-FcK).Agrobacterium-mediated transformation was used to generate transgenic plants expressing recombinant genes. The presence of transgenes was confirmed by genomic PCR. Western blot, confocal immunofluorescence, and sandwich ELISA showed the expression of recombinant proteins. The stability, flexibility, and bioactivity of recombinant proteins were analyzed and demonstrated through N-glycosylation analysis, animal trials, and sera ELISA. Our results suggest that the KDEL retained proteins in ER with oligomannose glycan structure and enhanced protein accumulation level. The sera of mice immunized with GA733-FcK purified from plants contained immunoglobulins which were at least as efficient as the mammalian-derived GA733-Fc at recognizing human colorectal cancer cell lines. Thus, a plant system can be used to express the KDEL fusion protein with oligomannose glycosylation, and this protein induces an immune response which is comparable to non-KDEL-tagged, mammalian-derived proteins.

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