Transgenic Plants with Recombinant DNA for Cold Tolerance
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Solution Overview
Problem
Agricultural crops such as corn, soybean, and cotton are sensitive to chilling temperatures, leading to reduced growth, yield, and increased susceptibility to stress, which limits their geographical range and growing season, and existing methods for improving cold tolerance are time-consuming and labor-intensive.
Innovation Solution
The development of transgenic plants with improved cold tolerance through the expression of recombinant DNA molecules that encode polypeptides conferring cold acclimation characteristics, allowing for faster germination and growth under low temperature conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional breeding methods are used to improve cold tolerance, then cold tolerance may be improved, but the process is time-consuming and labor-intensive
Solution Approach 1:
The patent replaces conventional mechanical breeding methods with genetic engineering techniques. Specifically, it uses recombinant DNA technology to directly introduce cold tolerance genes into plant genomes, bypassing the time-consuming process of traditional cross-breeding and selection. This substitution of genetic manipulation for mechanical breeding dramatically reduces the time required to develop cold-tolerant varieties while maintaining or improving the reliability of cold tolerance.
Solution Approach 2:
The patent changes the fundamental parameter of how cold tolerance is introduced into plants. Instead of relying on gradual genetic selection through breeding, it directly modifies the genetic composition by introducing specific genes (such as CBF3 transcription factor genes) that confer cold tolerance. This parameter change from selective breeding to direct genetic introduction accelerates the development process while ensuring reliable cold tolerance expression.
2Loss of time
If transgenic approaches are used to improve cold tolerance, then breeding time is reduced, but device complexity and manufacturing complexity increase
Solution Approach 1:
The patent extracts the essential cold tolerance function from complex breeding programs and concentrates it into specific, identifiable genes (such as CBF3 transcription factor genes). By isolating and utilizing only the critical genetic elements responsible for cold tolerance, the patent simplifies the overall process despite the sophistication of the genetic engineering techniques employed. This extraction approach reduces the complexity burden by focusing on key genes rather than managing entire genomes through breeding.
Solution Approach 2:
The patent employs transcription factor genes (such as CBF3) that have universal applicability across different plant species. These genes can confer cold tolerance in multiple crop plants through the same genetic mechanism, reducing the need for species-specific breeding programs. This universality simplifies the genetic engineering approach by using a standardized set of genes that can be applied broadly, thereby reducing overall device and manufacturing complexity despite the advanced techniques required.
3Reliability
If cold acclimation genes are introduced, then cold tolerance is improved, but plant growth under normal conditions may be affected
Solution Approach 1:
The patent utilizes transcription factor genes (such as CBF3) that dynamically regulate gene expression in response to environmental conditions. These genes are activated specifically under cold stress conditions and remain dormant under normal growing conditions. This dynamic expression pattern ensures that cold tolerance mechanisms are deployed only when needed, preventing any potential negative effects on plant growth and productivity during optimal growing conditions while maintaining reliable cold tolerance when temperatures drop.
Data Source
AI summary
Methods and materials for modulating cold tolerance levels in plants are disclosed. For example, nucleic acids encoding cold tolerance-modulating polypeptides are disclosed as well as methods for using such nucleic acids to transform plant cells. Also disclosed are plants having increased levels of cold tolerance and plant products produced from plants having increased cold tolerance levels.