Embryo Explant Flotation for Higher Monocot Regeneration Throughput
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Solution Overview
Problem
Existing methods for genetically modifying monocot plants are inefficient and reliant on callus culture, which are space and time-consuming, and lack germplasm independence.
Innovation Solution
A method involving the preparation and transformation of monocot seed excised embryo explants using force treatments such as gravitational or centrifugal forces during Agrobacterium inoculation, combined with rehydration and co-culture steps, to enhance transformation efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If callus culture methods are used for genetic modification of monocot plants, then transformation can be achieved, but the process is time-consuming and space-consuming
Solution Approach 1:
The patent applies parameter changes by modifying the physical state of explants through rehydration treatment and applying gravitational or centrifugal forces during Agrobacterium inoculation. These parameter changes enable direct transformation of excised embryo explants without requiring prolonged callus culture, thereby reducing transformation time while maintaining efficiency
Solution Approach 2:
The patent employs preliminary action through pre-treatment steps including excision of embryo explants, rehydration, and force treatment before Agrobacterium inoculation. These preliminary actions prepare the explants for efficient transformation, eliminating the need for time-consuming callus culture induction and maintenance
2Productivity
If callus culture methods are used for genetic modification of monocot plants, then transformation can be achieved, but space requirements increase
Solution Approach 1:
By changing the physical parameters of explant preparation and applying force treatments, the patent achieves high transformation efficiency in a streamlined process that requires minimal laboratory space, eliminating extensive callus culture infrastructure
Solution Approach 2:
The patent extracts and eliminates the callus culture step from the transformation process. By directly transforming excised embryo explants through rehydration and force treatment, the method removes the space-consuming callus induction and maintenance stages while preserving transformation effectiveness
3Productivity
If conventional methods are used for monocot plant transformation, then transformation can be performed, but the process lacks germplasm independence
Solution Approach 1:
The patent uses preliminary excision of embryo explants from seeds of any monocot germplasm, followed by rehydration and force treatment. This preliminary preparation enables direct transformation that works across diverse germplasm types without requiring establishment of specific callus culture conditions for each genotype, thereby achieving germplasm independence
4Ease of operation
If Agrobacterium inoculation is performed without force treatment, then the process is simpler, but transformation frequency is low
Solution Approach 1:
The patent applies periodic action through controlled application of gravitational or centrifugal forces during specific stages of Agrobacterium inoculation. This periodic force treatment enhances transformation frequency by promoting bacterial attachment and T-DNA transfer, while the forces are applied only during critical inoculation periods rather than continuously, maintaining operational simplicity
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
Improves transformation frequency and regeneration efficiency of genetically modified monocot plants by up to 40-fold, reducing time and space requirements.
Implementation Method 1
force treatments such as gravitational or centrifugal forces during Agrobacterium inoculation
Implementation Method 2
force treatments such as gravitational or centrifugal forces during Agrobacterium inoculation
Implementation Method 3
rehydration and co-culture steps
Data Source
AI summary
The disclosure provides novel methods for improving the regeneration throughput and/or plugging frequency of monocot embryo explants by flotation and selective collection of viable and regenerable explants. Genetic modification or transformation of monocot plants may include preparation of seed excised embryo explants, rehydration, inoculation and co-culture, bud induction, extended bud induction, and regeneration of genetically modified plants or plant parts. To improve regeneration and plugging frequency, cultured monocot seed excised embryo explants following the bud induction or extended bud induction step are placed in a flotation medium to separate the explants into top and bottom layers or fractions, such that the top fraction can be selectively collected and advanced to regeneration media. The top fraction is shown to have a higher or similar plugging frequency than the bottom fraction and thus the flotation step reduces costs and improves transformation throughput by removing unproductive explants in the bottom fraction having a much lower regeneration and plugging frequency.