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Punnett Squares

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Ligand Binding and Linkage

Ligand Binding and Linkage

Allosteric proteins have more than one ligand binding site; the binding of a ligand to any of these sites influences the binding of ligands to the other sites. When a protein is allosteric, its binding sites are called coupled or linked. In the case of enzymes, the site that binds to the substrate is known as the active site and the other site is known as the regulatory site. When a ligand binds to the regulatory site, this leads to conformational changes in the protein that can influence...

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QTL/Linkage Mapping for Rust Resistance: Step-by-Step Guide.

Ana Laura Achilli¹, Naveen Kumar², Vincent Fetterley^1,3

¹Faculty of Land and Food Systems, The University of British Columbia, Vancouver, BC, Canada.

Methods in Molecular Biology (Clifton, N.J.)

|April 8, 2025

Summary

Identifying new wheat rust resistance genes is crucial for crop yield. This study details methods for quantitative trait loci (QTL) mapping to find these genes, aiding in developing rust-resistant wheat varieties.

Keywords:

Genotyping Leaf rust Phenotyping Plant disease Plant–microbe interactions QTL mapping Stem rust Stripe rust Wheat

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Area of Science:

Plant Pathology
Agricultural Science
Genetics

Background:

Wheat rusts (stripe, leaf, stem) cause major global yield losses.
Enhancing wheat rust resistance is vital for food security.
Quantitative trait loci (QTL) mapping aids in identifying resistance genes.

Purpose of the Study:

To summarize protocols for statistical analysis of rust resistance in wheat.
To identify QTL conferring rust resistance in segregating populations.
To facilitate marker-assisted selection for rust resistance breeding.

Main Methods:

Statistical analysis of rust resistance in segregating wheat populations.
QTL mapping at seedling and adult plant stages.
Development of genetic markers linked to resistance QTL.

Main Results:

Established methodologies for QTL identification in wheat rust resistance.
Provided a foundation for fine mapping of resistance genomic regions.
Highlighted the utility of molecular markers for breeding applications.

Conclusions:

QTL mapping is essential for discovering and utilizing wheat rust resistance genes.
Developed methods support the genetic improvement of wheat cultivars against rust diseases.
Marker-assisted selection accelerates the development of rust-resistant wheat.