Molecular Characterization and Efficacy Evaluation of Transgenic Maize Harboring Icry2Ab/I-Ivip3A/I-Icp4epsps/I for Insect Resistance and Herbicide Tolerance

Insect infestation and weed interference have a seriously negative impact on the growth, yield, and grain quality of maize. In this study, transgenic maize plants harboring three exogenous genes, cry2Ab, vip3A, and cp4epsps, that were constructed into a single T-DNA were developed for protection aga...

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Bibliographic Details
Published in:Plants (Basel) 2023-01, Vol.12 (3)
Main Authors: Liu, Fantao, Liu, Yuan, Zou, Junjie, Zhang, Lan, Zheng, Hongyan, Luo, Yanzhong, Wang, Xiaoping, Wang, Lei
Format: Article
Language:English
Subjects:
Analysis
Biotechnology
Corn
DNA sequencing
Enzyme-linked immunosorbent assay
Food
Genes
Genetic engineering
Genetically engineered foods
Genetically modified crops
Genomes
Genomics
Herbicide resistance
Herbicides
Insect resistance
Nucleotide sequencing
Plants
Protection and preservation
Testing
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Summary:Insect infestation and weed interference have a seriously negative impact on the growth, yield, and grain quality of maize. In this study, transgenic maize plants harboring three exogenous genes, cry2Ab, vip3A, and cp4epsps, that were constructed into a single T-DNA were developed for protection against insects and weeds. The transgene integration sites on the chromosomes in two transgenic maize events, CVC-1 and CVC-2, were determined using whole genome sequencing and specific PCR detection. As revealed by laboratory insect bioassays, these two transgenic events exhibited strong insecticidal toxicity against three major species of Lepidoptera insects, including Mythimna separata, Helicoverpa armigera, and Spodoptera frugiperda, with mortality rates exceeding 96%, 100%, and 100%, respectively, after six days of infestation. In addition, CVC-1 exhibited a high tolerance to glyphosate under field conditions. The successful expressions of cry2Ab, vip3A, and cp4epsps in various tissues at different developmental stages of CVC-1 were validated at the transcriptional and translational levels using quantitative real-time reverse transcription PCR (qRT-PCR) and enzyme-linked immunosorbent assay (ELISA), respectively. These findings demonstrated that the transgenic maize CVC-1 developed using this triple gene construct has excellent insect resistance and herbicide tolerance, which may provide a valuable germplasm resource and data support for future maize breeding of insect and weed control.
ISSN:2223-7747
2223-7747
DOI:10.3390/plants12030612