In Planta Gene Expression and Gene Editing in Moso Bamboo Leaves
August 18th, 2023
In this study, a novel in planta gene expression and gene editing method mediated by Agrobacterium was developed in bamboo. This method greatly improved the efficiency of gene function validation in bamboo, which has significant implications for accelerating the process of bamboo breeding.
In this study, we use the as a vector to introduce foreign DNA fragments into bamboo leafs. Most DNA fragments are not integrated into chromosomes and good transferred expression. We took activation of this transferred expression to carry out gene editing.
The main challenge is the limitation of gene editing of bamboo leaves, which cannot regenerate. These propose difficulties in performing editing in regenerative organs, like young shoots, and opportunity added benches are subsequent generations with desired genetic challenges. The main advantage is the time saving aspect of the principle.
By being able to edit bamboo genes directly in bamboo leaves, it allows for quick verification of gene factions. This eliminates the needs for time consuming procedures, like tissue culture or transformation, significantly speeding up research on bamboo gene infections. The primary research will be focused on investigating the molecular mechanism of bamboo biomass formation.
This will involve understanding why bamboo grows rapidly, and using that knowledge to develop bamboo varieties which are suitable for plastic substitute. To begin, sow the pre-soaked bamboo seeds into the substrate of soil and vermiculite for germination. For agrobacterium infection, carefully remove the 15 day old seedlings with soil attached roots from the substrate.
Wrap the seedlings with tinfoil to maintain moisture and prevent soil detachment. Transfer the wrapped seedlings to the plant growth chamber with higher humidity and lower illumination for two hours. Next, using a sharp needle from a syringe wound, the upper part of curled immature leaves once or twice.
Quickly dip the wounded part of the leaves into agrobacterium suspension. Then immediately transfer the seedlings to a vacuum chamber with a pressure of 25 to 27 millimeters of mercury for two minutes. After vacuuming, carefully unwrap the seedlings and replant them into the substrate.
Allow the seedlings to grow in a plant growth chamber in dim light, with high humidity for two days. Then culture the seedlings under normal growth conditions, watering them every five to seven days. Begin by extracting the genomic DNA from the wild type and agrobacterium infected bamboo leaves.
Amplify the genomic DNA containing the target site of the target genes from wild type and agrobacterium infected bamboo leaves, using the following PCR conditions. After PCR, perform endonuclease enzyme digestion by preparing a reaction mixture containing one microliter of AGE1, one microgram of PCR products, and five microliter 10 times buffer. Then add water to a final volume of 50 microliters.
Incubate the digestion mixture at 37 degrees Celsius for one hour. Using gel electrophoresis, analyze the proportion of digested DNA fragments. Compare the digested fragments from the wild type and agrobacterium infected samples to assess gene editing efficiency.
Expose the bamboo seedlings to high light intensity conditions to increase the amount of absorbed light quantum and activation of the leaf photo protection system. Next, turn on the imaging pam fluorimeter and set the actinic light intensity to measure in vivo photo system two, chlorophyll fluorescence of bamboo leaves The red beta lane color produced by the ruby gene indicated successful agrobacterium, mediated gene expression in bamboo leaves. Out of the four agrobacterium strains, GV3101 strain caused the most significant, beta lane accumulation in infected bamboo leaves.
After infection with the CRISPR CAS9 constructs and high light treatments, certain areas of the leaf blades showed lower, non-photo chemical quenching values. Furthermore, enzyme digestion and sequencing analysis confirmed the successful mutation of the PeVDE gene in the edited regions. Sanger sequencing results of the PeVDE fragment, after editing by both, sgRNA1 and sgRNA2 showed deletion of a long fragment in the PeVDE gene.
After 30 days of agrobacterium infection, the leaf areas transfected with sgRNAs for both PeVDE and PeCCR5 exhibited lower, non-photo chemical quenching values.
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Overview
This study presents a novel in planta gene expression and editing method in bamboo utilizing Agrobacterium, aimed at enhancing gene function validation efficiency. The method shows promising potential for accelerating bamboo breeding processes by allowing quick verification of genetic modifications directly in leaf tissues.
Key Study Components
Research Area
- Gene expression and editing in bamboo
- Application of Agrobacterium for genetic modification
- Implications for bamboo breeding and biomass research
Background
- Challenges in gene editing of non-regenerative organs in bamboo
- Importance of understanding genetic mechanisms for rapid growth
- Potential for developing bamboo varieties suitable for plastic substitution
Methods Used
- Agrobacterium-mediated gene editing and expression
- Bamboo leaf tissues as experimental model
- PCR, enzyme digestion, and gel electrophoresis for gene analysis
Main Results
- Successful introduction and expression of genes in bamboo leaves
- Efficient editing of the PeVDE gene confirmed through sequencing
- High light treatments improved gene expression outcomes
Conclusions
- The study demonstrates an efficient method for gene editing in bamboo, facilitating quicker validation of genetic functions.
- This advancement is significant for future research and applications in bamboo breeding.
Frequently Asked Questions
Executive Industry Relevance
Direct in planta gene expression and editing in moso bamboo leaves enables rapid functional validation of genetic targets without the need for tissue culture or callus induction. This approach accelerates the interrogation of gene function and supports efficient de-risking of candidate genes in a complex, non-model plant system. The method enhances predictive confidence at the early discovery and target validation stages, streamlining portfolio triage for traits relevant to biomass and material innovation.
Strategic Applications in Biopharma R&D
Early Discovery & Target Validation
- Enables rapid hypothesis testing of gene function in native bamboo tissue.
- Supports mechanistic de-risking by allowing direct assessment of gene edits on physiological traits.
- Facilitates functional target validation for genes involved in metabolic and growth pathways.
- Improves predictive confidence for advancing gene targets in plant biotechnology pipelines.
Screening & Assay Development
- Prepares validated leaf-based systems for downstream gene function assays.
- Delivers reproducible, quantitative outputs such as betalain accumulation and NPQ measurements.
- Enables scalable screening of gene editing constructs using visible and fluorometric reporters.
- Supports reliable evaluation of editing efficiency across multiple gene targets.
Translational & Preclinical Research
- Aligns gene function studies with traits relevant to biomass formation and material properties.
- Provides continuity from gene discovery to trait validation in a commercially relevant species.
- Reduces risk in advancing gene-edited lines for further translational research.
- Enables mechanistic insights into rapid growth and stress response pathways in bamboo.
Pipeline & Workflow Integration
This method integrates at the early discovery and target validation stages, bridging gene identification with functional assessment in planta and supporting downstream trait development.
- Discovery Biology: Accelerates hypothesis testing and pathway clarification by enabling direct gene editing in leaves.
- Screening: Provides assay-ready systems with quantitative readouts for editing efficiency and phenotypic impact.
- Analytics: Delivers measurable outputs such as mutation rates and NPQ values for comparative analysis.
- Translational Research: Supports trait validation relevant to biomass and material science applications.
- Enterprise Reuse: Establishes a reusable platform for rapid gene function interrogation in bamboo and potentially other recalcitrant species.
Operational & Enterprise Impact
- Scientific Value: Increases predictive confidence and reduces mechanistic ambiguity in gene function studies.
- Operational Value: Streamlines workflows by eliminating tissue culture, enhancing reproducibility and scalability.
- Strategic Value: Enables faster go/no-go decisions and capital-efficient advancement of gene targets.
- Portfolio Impact: Supports risk-adjusted prioritization of gene editing projects in plant biotechnology pipelines.
Implementation Considerations
- Requires expertise in Agrobacterium-mediated transformation and plant molecular biology.
- Needs access to vacuum infiltration equipment and fluorometric analysis tools.
- Demands cross-team standardization of infection, wounding, and measurement protocols.
- May require adaptation for different bamboo varieties or other non-model species.
- Limited to non-heritable edits in leaves; integration into breeding pipelines may need further development.
Biopharma FAQs
Chapters in this video
0:00
Introdution
1:42
Preparation of Bamboo Seedlings and AgrobacteriumāMediated In Planta Transformation System for Gene Expression
3:28
In Planta Gene Expression and Measurement of Chlorophyll Fluorescence of NonāPhotochemical Quenching Values in Bamboo Leaves
