Wheat CENH3 Mutations for Non-Transgenic Haploid Induction
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Solution Overview
Problem
Existing methods for generating haploid plants in wheat, particularly through CENH3 protein manipulation, are laborious, time-consuming, and require transgenic plants, with low yield and limited applicability across crop species.
Innovation Solution
A method involving wheat plants with specific genome mutations in the CENH3 gene, including knock-out and knock-down mutations in the B and D genomes, and a mutated CENH3 gene in the A genome, to induce haploid plants efficiently, which can be doubled to achieve homozygosity in one generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If existing methods for generating haploid plants through CENH3 protein manipulation are used, then haploid plants can be produced, but the process is laborious and time-consuming
Solution Approach 1:
The invention changes the functional state of CENH3 genes through mutation (from functional to non-functional or altered), enabling haploid induction without requiring transgenic manipulation. This parameter change in gene functionality directly improves productivity by simplifying the breeding process and reducing time requirements.
Solution Approach 2:
The invention extracts and utilizes the natural haploid induction capability present in mutant wheat plants, eliminating the need for complex transgenic systems. By taking out the essential function (haploid induction) and achieving it through natural mutation rather than artificial genetic engineering, the process becomes less laborious and faster.
2Productivity
If existing transgenic methods are used to manipulate CENH3 protein, then haploid plants can be generated, but transgenic plants are required which increases complexity and cost
Solution Approach 1:
The invention extracts the haploid induction function from complex transgenic systems and achieves it through simple natural mutations in CENH3 genes. This eliminates the need for transgenic plants, regulatory frameworks, and complex molecular biology techniques, thereby reducing system complexity while maintaining productivity.
Solution Approach 2:
The invention uses simple, non-transgenic mutant plants that can be easily generated and discarded after use as haploid inducers. Unlike transgenic systems that require complex maintenance and regulation, these mutant plants serve their purpose and can be replaced by new mutants, reducing overall system complexity and cost.
3Productivity
If existing CENH3 manipulation methods are used, then some haploid induction occurs, but the yield of haploid plants is low
Solution Approach 1:
The invention changes the CENH3 gene parameters through specific mutations (knockout, knockdown, or functional alteration) to create a consistent and reliable haploid induction mechanism. This parameter change ensures that the mutant plants reliably produce haploid progeny, improving both yield and consistency compared to partial or inconsistent induction methods.
Data Source
AI summary
The present invention relates to wheat plants comprising a mutation causing an alteration of the amino acid sequence in centromere histone H3 (CENH3), which have the biological activity of a haploid inducer. Further, the present invention provides methods of generating the wheat plants of the present invention and haploid and doubled haploid wheat plants obtainable by crossing the wheat plants of the present invention with wildtype wheat plants.