Modified HaHB4 Transcription Factor Yield Stress Tolerance
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Solution Overview
Problem
Current crop varieties lack increased yield and stress tolerance under varying environmental conditions, particularly water-stressed conditions, and existing HaHB4 transgenic plants exhibit yield penalties when expression is too high due to constitutive promoters.
Innovation Solution
Development of modified HaHB4 sequences and variants for genetic engineering in transgenic plants, which include distinct sequence alterations, resulting in enhanced yield and photosynthesis rates under both water-stressed and non-water stressed conditions, using optimized promoter control to avoid yield penalties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If HaHB4 transcription factor expression is increased in transgenic plants, then tolerance to water stress is improved, but yield decreases under non-stress conditions
Solution Approach 1:
The patent applies dynamics by replacing constitutive promoters with inducible or stress-responsive promoters that allow HaHB4 expression to be dynamically regulated. The transcription factor is expressed at low baseline levels under normal conditions to maintain yield, but can be upregulated in response to water stress signals to improve stress tolerance, thus resolving the contradiction between stress tolerance and yield
Solution Approach 2:
The patent modifies expression parameters by using alternative promoters with different expression characteristics (inducible, tissue-specific, or stress-responsive) to control HaHB4 transcription levels. This allows optimization of expression timing and intensity, enabling the plant to achieve stress tolerance when needed while maintaining normal yield under non-stress conditions
2Reliability
If HaHB4 transcription factor expression is constitutively high, then water stress tolerance is enhanced, but photosynthesis efficiency and yield are reduced
Solution Approach 1:
The patent implements periodic action by using stress-inducible promoters that trigger HaHB4 expression specifically under water stress conditions rather than continuous constitutive expression. This periodic induction allows the plant to maintain normal photosynthesis efficiency during non-stress periods while activating stress tolerance mechanisms only when water stress occurs, avoiding the energy cost and photosynthesis inhibition associated with constant high-level expression
Data Source
AI summary
The invention relates to polynucleotides encoding a modified HaHB4 transcription factor and polynucleotides encoding functionally active fragments and variants of a modified HaHB4 transcription factor as well as vectors and host cells containing these polynucleotides and the polypeptides encoded by these polynucleotides. The invention also encompasses transgenic host cells, plants, seed, pollen, and plant parts containing the polypeptides and/or polynucleotides of the invention. The invention further encompasses methods of producing transgenic host cells, plants, seed, pollen, and plant parts and the processed plant products produced from these transgenic hosts.