bHLH142 Gene Mutations for Temperature-Sensitive Male Sterility in Rice
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Solution Overview
Problem
Current methods for hybrid rice seed production, particularly using genetic male sterility (GMS), face challenges in efficiently and economically maintaining male sterile lines, which hampers large-scale production due to the need for costly maintainers and restorers, and lacks efficient control over pollen development.
Innovation Solution
A mutated nucleotide molecule encoding the transcription factor bHLH142 is introduced, with a T-DNA segment inserted in its third intron, creating a male sterile mutant plant that can be used as a female parent for F1 hybrid seed production, and a transformed plant cell with overexpressed bHLH142 to restore fertility under specific temperature conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If genetic male sterility (GMS) is used for hybrid rice seed production, then hybrid vigor and yield improvement are achieved, but production costs increase due to the need for maintainer and restorer lines
Solution Approach 1:
The patent extracts and utilizes a specific natural mutant (PGMS) that exhibits temperature-sensitive male sterility. By selecting this pre-existing mutant with desirable characteristics, the invention eliminates the need for complex transgenic systems and costly maintainer/restorer lines, directly reducing production costs while maintaining hybrid vigor
Solution Approach 2:
The patent exploits temperature as a critical parameter to control male sterility expression. The PGMS mutant displays male sterility at temperatures above 23.5°C and fertility at lower temperatures, allowing flexible control of sterility expression based on environmental conditions without additional genetic complexity
2Ease of manufacture
If photoperiod- or temperature-inducible MS mutants are used to maintain seed stocks, then the need for costly maintainer lines is reduced, but control over pollen development becomes less efficient
Solution Approach 1:
The patent employs a dynamic system where male sterility expression responds naturally to temperature fluctuations. The PGMS mutant automatically switches between sterile and fertile states based on environmental temperature, providing both cost-effective seed stock maintenance and flexible operational control without complex management protocols
3Adaptability or versatility
If transgenic male sterility systems are used, then reversible control of sterility is achieved, but the complexity of maintaining MS lines increases
Solution Approach 1:
The patent utilizes a simple, naturally occurring mutant (PGMS) rather than complex transgenic systems. This approach treats the male sterility trait as a simple environmental response that can be easily managed through temperature control, eliminating the need for complex transgenic maintenance protocols while retaining reversibility
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
The approach enables improved yield and quality of crops by ensuring efficient production of hybrid seeds through controlled male sterility, reducing production costs and enhancing productivity by utilizing the bHLH142 gene's role in regulating tapetal programmed cell death during pollen development.
Implementation Method 1
the bHLH142 gene's role in regulating tapetal programmed cell death during pollen development
Data Source
AI summary
The present invention relates to a method for producing male sterile plant, a mutated nucleotide molecule comprising a nucleotide sequence of the transcription factor bHLH142 and an inserted T-DNA segment, and a novel transformed plant cell and a male-sterile mutant plant comprising the mutated nucleotide molecule, in which the transcription factor bHLH142 is not expressed. The present invention also relates to a novel reversible male sterile transgenic plant, wherein the transcription factor bHLH142 is overexpressed, and its preparation method. The bHLH gene is tissue specifically expresses in the anther and it plays a pivotal role in pollen development. Both the male sterile and reversible male sterile transgenic plants showed a completely male sterile phenotype, but the fertility of the reversible male sterile transgenic plant can be restored under low temperature.