Microfluidic Protoplast Encapsulation for Fluorescent Plant Screening
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Solution Overview
Problem
Current methods for plant genetic engineering and gene editing face challenges in efficiently screening and recovering whole plants from modified protoplasts due to low survival rates and inefficient cell sorting, particularly in microfluidic systems, which lack uniform polymerization, external components, and fluorescence detection, leading to low regeneration efficiency.
Innovation Solution
A microfluidic chip system that separates and encapsulates plant protoplasts in droplets with an encapsulation medium, using immiscible liquids and controlled gelification, enabling detection and sorting based on fluorescence, to increase viability and recovery efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If microfluidic systems are used for plant protoplast separation and encapsulation, then throughput and sorting efficiency are improved, but cell survival rate and transformation efficiency deteriorate
Solution Approach 1:
The system segments the protoplast suspension into individual single-cell droplets using microfluidic channels, enabling high-throughput processing while maintaining cell integrity. Each droplet contains a single protoplast, allowing parallel processing of many cells simultaneously without mechanical stress from traditional sorting methods.
Solution Approach 2:
The system changes the physical state of the encapsulation medium from liquid to gel through controlled polymerization. This parameter change provides mechanical protection to protoplasts during processing, improving survival rate while maintaining the high-throughput capability of the microfluidic system.
2Productivity
If rapid phenotyping and sorting are implemented, then selection efficiency is improved, but cell viability and regeneration efficiency worsen
Solution Approach 1:
The system performs fluorescence detection and sorting of protoplasts before encapsulation and regeneration. By identifying and selecting target protoplasts in advance based on fluorescent markers, the system ensures that only viable, correctly modified cells are encapsulated and propagated, improving both selection efficiency and subsequent regeneration success.
Solution Approach 2:
The encapsulation medium acts as an intermediary protective environment between the sorted protoplasts and the regeneration process. This medium provides nutrients, protects against stress, and creates optimal conditions for cell division and plant regeneration, thereby improving regeneration efficiency without compromising sorting speed.
3Reliability
If encapsulation with polymerization is used, then cell protection is improved, but uniformity of encapsulation and process complexity worsen
Solution Approach 1:
The encapsulation medium contains its own polymerization reagents and performs self-polymerization upon contact with the protoplast solution. This self-service mechanism eliminates the need for separate polymerization steps or additional reagent addition, simplifying the overall process while ensuring uniform encapsulation and strong cell protection.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The system significantly enhances the viability of protoplasts and recovery of whole plants by ensuring controlled encapsulation, detection, and sorting, thereby improving the efficiency of plant propagation and selection.
Implementation Method 1
separate single protoplasts in individual aqueous droplets which are then sorted based on fluorescence signals
Implementation Method 2
Microcapsules comprising the biological sample can be preserved by a polymerisation process that forms a hydrogel around the biological sample
Implementation Method 3
sorted based on fluorescence signals
Data Source
AI summary
Provided are methods and systems for propagating plant material and the plant cells obtained thereby. The method comprises providing a solution comprising a plurality of plant protoplasts comprising an encapsulation medium or encapsulation medium precursor, introducing the solution into a microfluidic device, forming droplets of the solution in the microfluidic device, at least some of which encapsulate a single protoplast, causing the encapsulation medium or encapsulation medium precursor to gelify in the microfluidic device, and collecting the encapsulated protoplasts. The system comprises a microfluidic device comprising a droplet generator, a first injection system comprising a first liquid and configured for injecting the first liquid into the droplet generator, and a second injection system comprising a second liquid and configured for separately injecting a second liquid that is immiscible with the first liquid into the droplet generator. The first liquid is a solution comprising protoplasts and the first liquid comprises an encapsulation medium or encapsulation medium precursor, and the system is configured such that droplets are formed in the droplet generator, each droplet enclosing a single or no protoplast and comprising the encapsulation medium or encapsulation medium precursor. The encapsulation medium or encapsulation medium precursor in the droplets is gelified in the microfluidic to generate gelified droplets enclosing a single or no protoplast.