Wheat G-type CMS Restorer Gene Marker Selection
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Solution Overview
Problem
Current methods for hybrid seed production in wheat lack accurate markers for identifying and tracking Rf loci, particularly for G-type cytoplasmic male sterility, which hinders fertility restoration in wheat Triticum timopheevi cytoplasm.
Innovation Solution
A method is described for selecting and producing cereal plants with a functional restorer gene allele for wheat G-type cytoplasmic male sterility by identifying marker alleles linked to the Rf gene on chromosome 1B, using specific markers such as those listed in SEQ ID NO 2 to 14, to restore fertility in progeny plants.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional phenotypic selection methods are used for fertility restoration, then the selection process is simple and does not require molecular markers, but the accuracy of identifying plants with functional restorer genes is low and environmental factors affect the selection reliability
Solution Approach 1:
The patent replaces traditional phenotypic selection (mechanical/physical observation of fertility traits) with molecular marker-based genotypic selection. Specific molecular markers (e.g., Xgwm550, Xbarc207, Xcdo388) are used to detect the presence of restorer genes directly at the DNA level, eliminating the need for environmental-dependent phenotypic expression and significantly improving identification accuracy.
Solution Approach 2:
The patent introduces molecular markers as intermediary elements that serve as proxies for the restorer genes. These markers are genetically linked to the restorer genes and can be detected independently, allowing indirect but accurate selection of plants with functional restorer genes without directly observing the complex fertility restoration phenotype.
2Adaptability or versatility
If phenotypic selection for fertility restoration is performed, then the method can be performed without specialized equipment, but the selection cannot be performed independently of environmental factors and timing is constrained
Solution Approach 1:
The patent replaces environment-dependent phenotypic observation with environment-independent molecular detection. DNA-based marker analysis can be performed in controlled laboratory conditions using standard molecular biology techniques (PCR, gel electrophoresis), completely eliminating the influence of environmental factors such as temperature, humidity, and nutrient availability on selection accuracy.
3Measurement precision
If existing RFLP markers are used for tracking Rf loci, then the markers are already established in the literature, but the markers are not tightly linked to the causal gene and provide insufficient precision for accurate selection
Solution Approach 1:
The patent segments the chromosomal region containing the restorer gene into smaller intervals using multiple tightly linked markers. Instead of relying on a single distant marker, the patent uses combinations of markers (e.g., Xgwm550, Xbarc207, Xcdo388) that define smaller chromosomal intervals, thereby increasing the precision of gene localization and reducing recombination events between the marker and the restorer gene.
Data Source
AI summary
Methods are described for selecting or producing a cereal plant comprising a functional restorer gene for wheat G-type cytoplasmic male sterility and nucleic acids for use therein.