Stress-Inducible Root-Promoter Annexin Expression
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Solution Overview
Problem
Current genetic modifications in plants fail to consistently increase yield under drought stress conditions, particularly in field-grown cotton and soybeans, due to limitations in stress-induced and root-preferential gene expression technologies.
Innovation Solution
Development of a recombinant gene system utilizing a stress-induced and root-preferential promoter, such as the Pbtg-26GhD10 promoter, to express an Annexin protein in plants, specifically targeting root tissues under drought stress, thereby enhancing yield by improving stress tolerance and root function.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If constitutive promoters are used to express stress tolerance genes, then gene expression is maintained continuously, but yield increase under drought stress is inconsistent and insufficient
Solution Approach 1:
The patent employs a dynamic promoter system that responds to drought stress conditions by activating gene expression only when needed. The promoter contains stress-responsive elements that are activated by drought-induced transcription factors, creating a dynamic expression pattern that adapts to environmental conditions rather than maintaining constant expression.
Solution Approach 2:
The invention utilizes changes in physiological parameters (drought stress conditions) to regulate gene expression. The promoter responds to changes in water availability, hormone levels (ABA), and stress-induced signaling pathways to modulate transcriptional activity, thereby optimizing yield under specific stress conditions.
2Reliability
If root-preferential promoters are used to target root tissues, then stress tolerance is improved, but expression is not sufficiently induced under stress conditions
Solution Approach 1:
The patent merges two functional promoter components: a root-preferential promoter element that directs tissue-specific expression to roots, and a stress-inducible promoter element that activates expression under drought conditions. This combined promoter system achieves both root-specific targeting and stress-responsive activation, resolving the contradiction between tissue specificity and stress induction.
Solution Approach 2:
The promoter is constructed as a composite regulatory element integrating multiple functional domains: root-specific binding sites, stress-responsive elements, and inducible activation sequences. This composite structure enables simultaneous achievement of root-preferential expression and stress-induced activation that neither component could achieve alone.
3Productivity
If stress-induced promoters are used to activate genes under drought conditions, then yield improvement is achieved, but root-preferential expression is not sufficiently targeted
Solution Approach 1:
The promoter system implements local quality by creating different expression characteristics in different tissues. Through root-preferential promoter elements, the system ensures that the stress-induced gene expression is concentrated specifically in root tissues rather than being uniformly distributed throughout the plant, thereby achieving both stress response and tissue specificity.
Data Source
AI summary
The present invention relates to the field of agriculture. In particular, the invention provides a promoter, a recombinant gene, plants comprising the recombinant genes and a method to improve yield of a cotton plant under stress conditions.