Reduction of EPSP synthase in transgenic wild turnip (Brassica rapa) weed via suppression of aroA

Rapeseed Transformation with aroA Bacterial Gene Containing P101S Mutation Confers Glyphosate Resistance

Field weed infestations can cause serious problems and require regular and planned programs to control them. Glyphosate is a broad-spectrum herbicide that inactivates the 5-enolpyruvylshikimate 3-phosphate synthase (EPSPS) enzyme and causes plant death. It has been reported that the mutation of proline 101 to serine in EPSPS is one of the effective mutations to reduce the affinity of glyphosate to EPSPS enzyme. In this study, we investigated the effect of the bacterial P101S mutant aromatic acid (aroA) gene on glyphosate resistance in transgenic rapeseeds. For this purpose, the mutant gene was synthesized and cloned into the pUC18 and pBI121 vectors. The gene was transferred to rapeseed by the Agrobacterium-mediated method. In this experiment, three generations of transgenic plants (T0, T1, and T2) were studied under in vitro and in vivo conditions. After the treatment of 75 putative transgenic plants with 10 mM glyphosate in T0 generation, resistant plants were identified and their seeds were harvested. In the T1 generation, out of 200 cultivated plants, 141 showed resistance. After the plants were treated with herbicides and resistance was determined, the seeds were harvested when they mature. In the T2 generation, most plants (162 plants of 200) were resistant to glyphosate. Therefore, the inheritance of resistance followed Mendel's first law, which is a sign of the monogenic character of resistance. Purification and increasing the percentage of resistant plants will be carried out in the next generations. It is concluded that P101S mutation guarantees glyphosate resistance of rapeseed and is recommended to study it in other plants.

Gene Analysis of Genetically Modified Soybean Lectin Based on Fluorescence Quantitative PCR

Considering that the genetically modified soybean lectin gene is affected by the gene type, to improve the stability of the genetically modified soybean lectin gene, a method based on fluorescence quantitative PCR to analyze the genetic characteristics of the genetically modified soybean lectin was proposed. The common soybean varieties, Wangshuibai and Huangdou No. 3 were selected as materials for tissue-specific expression analysis. Under the background conditions of analyzing the genetically modified soybean lectin genes, fluorescent quantitative PCR was applied to the analysis of genetic characteristics. The characteristics of the genetically modified soybean lectin gene were analyzed in terms of location characteristics and expression characteristics. The results showed that the soybean lectin gene has a complex functional mechanism and may participate in a variety of stress-related regulatory or signal transduction pathways in different ways; Lectin2.1 transcripts are expressed in abundance in glume and lemma in seedling tips, Lectin2.2 was mainly expressed in the roots, and a small amount was expressed in leaves and lemma; Lectin2.1 and Lectin2.2 are highly similar in nucleic acid and amino acid composition, and have similar subcellular localization characteristics.