Wheat TaMS7 Gene Editing for Stable Male Sterility
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Solution Overview
Problem
Current wheat hybrid breeding methods face challenges such as genetic defects, environmental dependence, and chemical pollution in traditional three-line and two-line systems, limiting the efficiency and stability of hybrid seed production.
Innovation Solution
The development of a fertility-related gene TaMS7 and its associated expression cassette, which includes an anther-specific promoter and pollen inactivation gene, is used to create a male sterile mutant line that can be transformed to restore fertility and maintain sterility, enabling efficient hybrid seed production through genetic modification techniques like CRISPR-Cas9.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If three-line system (nucleo-cytoplasmic interaction male sterile line) is used for hybrid seed production, then male sterility can be achieved, but genetic defects such as fewer restorer sources, adverse effect of alien cytoplasm, low selection rate of strong superiority combinations, and low purity of sterile line seeds occur
Solution Approach 1:
The patent changes the fundamental parameter of male sterility induction from cytoplasmic interaction to genic control through the TaMS7 gene. By mutating a specific nuclear gene (TaMS7) rather than relying on cytoplasmic factors, the system achieves male sterility through a controllable genetic parameter that can be precisely manipulated and restored, eliminating the limitations of alien cytoplasm and restricted restorer sources.
2Ease of manufacture
If chemical hybridization agents are applied to induce male sterile line, then male sterility can be achieved with simpler procedure, but poor stability, residues of chemicals, toxic and side effects, and heavy environmental pollution occur
Solution Approach 1:
The patent replaces the chemical induction system with a biological genetic system. Instead of using chemical agents to induce male sterility, the invention utilizes natural genetic mutation and manipulation of the TaMS7 gene to achieve the same effect. This substitution eliminates all chemical-related harmful factors while maintaining the simplicity of the procedure through genetic means.
3Device complexity
If photo-thermo-sensitive male sterile line is used for hybrid seed production, then dual function (both male sterile line and maintainer line) is achieved simplifying the procedure, but male sterility highly depends on environmental factors and variation of environment seriously affects yield, quality and purity
Solution Approach 1:
The patent extracts the environmental dependency from the male sterility mechanism. By isolating the TaMS7 gene as the sole determinant of sterility, the system removes the confounding environmental factors (photoperiod, temperature) that cause instability in photo-thermo-sensitive lines. The sterility trait becomes an intrinsic genetic property rather than an environmentally responsive state.
4Manufacturing precision
If CRISPR-Cas9 gene editing is used to mutate TaMS7 gene, then precise male sterile mutant can be obtained, but transformation complexity increases
Solution Approach 1:
The patent uses the CRISPR-Cas9 system as an intermediary tool to achieve precise gene mutation. The Cas9 enzyme guided by specific RNA sequences acts as a molecular intermediary that introduces targeted mutations to the TaMS7 gene with high precision. This intermediary mechanism enables controlled genetic modification while the complexity is confined to the transformation step, not the subsequent breeding and production processes.
Data Source
AI summary
The application discloses a wheat fertility-related gene TaMS7 and an application method thereof, and belongs to the field of biotechnology. By analyzing a genome-wide expression profile of wheat anthers at different development stages, we obtain the wheat fertility-related gene TaMS7, and regulate the fertility of a plant by adjusting expression of the gene to produce and maintain wheat male sterility lines and to prepare hybrid seeds, wherein the discovery of this gene has important theoretical and practical significance for establishing an efficient technology system of wheat hybrid seed production, and for studying wheat male sterility mechanism and heterosis.