Agrobacterium-mediated sugar cane transformation via controlled desiccation
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Solution Overview
Problem
Agrobacterium-mediated transformation of sugar cane is hindered by low efficiency and reproducibility due to cellular necrosis and limited transformation frequency, making it challenging to introduce desirable traits such as stress resistance and improved production characteristics.
Innovation Solution
A method involving the co-cultivation of Agrobacterium-inoculated sugar cane tissues in a desiccating or extreme desiccating environment to reduce cellular necrosis and enhance the transfer of nucleic acids, involving the inoculation of sugar cane tissues with Agrobacterium and subsequent co-cultivation on a surface without co-culture media to reduce the original weight of the inoculated tissue.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If Agrobacterium-mediated transformation is used to introduce heterologous polynucleotides into sugar cane cells, then genetic manipulation for desirable traits is achieved, but transformation efficiency and reproducibility remain low due to cellular necrosis
Solution Approach 1:
The invention changes the co-cultivation parameters by eliminating liquid media and controlling desiccation conditions (humidity, temperature, duration) to optimize transformation efficiency. By adjusting these physical parameters, the method achieves higher and more reproducible transformation frequencies while reducing cellular necrosis.
Solution Approach 2:
The method introduces dynamic control of environmental conditions during co-cultivation, specifically transitioning from static liquid media to a dynamic desiccation process where humidity and moisture are gradually reduced. This dynamic approach allows optimization of nucleic acid transfer while minimizing harmful effects.
2Productivity
If conventional co-cultivation with liquid media is used, then Agrobacterium transfer is maintained, but cellular necrosis occurs resulting in low transformation frequency
Solution Approach 1:
The invention converts the potentially harmful effect of complete desiccation into a beneficial controlled drying process. By applying gradual, controlled desiccation rather than complete drying, the method eliminates liquid media-induced necrosis while maintaining effective Agrobacterium-to-plant nucleic acid transfer, thus converting a harmful condition into a beneficial transformation enhancement.
Solution Approach 2:
The method extracts and eliminates the liquid co-culture media from the transformation system. By removing the liquid component entirely and replacing it with a controlled desiccation environment on solid surfaces, the invention eliminates the harmful effects of liquid media while preserving the essential bacterial transfer function.
3Quantity of substance
If extended co-cultivation time is used to improve transformation efficiency, then nucleic acid transfer increases, but tissue weight loss and necrosis worsen
Solution Approach 1:
The method performs preliminary action by pre-establishing the inoculated tissue on appropriate surfaces and pre-controlling environmental conditions before the actual transformation process. This preliminary preparation optimizes the tissue state for maximum nucleic acid transfer efficiency while minimizing subsequent weight loss and necrosis during the transformation period.
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
This approach significantly increases transformation frequency and recovery of transgenic sugar cane plants by reducing cellular necrosis and improving the delivery of nucleic acids, making the process more efficient and genotype-independent.
Implementation Method 1
A. tumefaciens transfers a particular polynucleotide segment of a tumor-inducing (Ti) plasmid into the nucleus of infected host cells, which subsequently stably integrates into the host's genome
Implementation Method 2
co-cultivating said Agrobacterium-inoculated sugar cane tissue or cell thereof on a surface in the absence of co-culture media for a time period sufficient to reduce original weight of said Agrobacterium-inoculated-inoculated sugar cane tissue or cell thereof
Data Source
AI summary
The present invention provides methods for producing a transformed sugar cane tissue or cell thereof, said methods comprising: a) inoculating a sugar cane tissue or a cell thereof with an Agrobacterium inoculation suspension, said Agrobacterium comprising a nucleic acid of interest, to obtain an Agrobacterium-inoculated sugar cane tissue or cell thereof; b) co-cultivating said Agrobacterium-inoculated sugar cane tissue or cell thereof on a surface in the absence of co-culture media for a time period sufficient to reduce original weight of said Agrobacterium-inoculated sugar cane tissue or cell thereof; and c) selecting a transformed sugar cane tissue or a cell thereof comprising said nucleic acid of interest. The transformation methods of the invention provide for increased transformation frequency and recovery of transgenic sugar cane plants.