Onion Disease Resistance QTL Selection Without Complementary Pinks
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Solution Overview
Problem
Existing plant breeding methods struggle to combine disease resistance in onion plants with desirable bulb colors efficiently due to genetic linkage issues, particularly with the undesirable complementary pinks (CP) trait, complicating the introgression of disease resistance loci.
Innovation Solution
The development of molecular markers linked to specific quantitative trait loci (QTL) on onion linkage groups, allowing for the introgression of disease resistance traits like Fusarium basal rot and pink root, while avoiding the CP trait, through marker-assisted selection (MAS) and marker-assisted backcrossing, enabling the production of onion plants with desired disease resistance and bulb color.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional plant breeding methods are used to introgress disease resistance loci, then disease resistance is improved, but genetic linkage with undesirable traits (complementary pinks) complicates the breeding process and reduces efficiency
Solution Approach 1:
The patent divides the breeding process into distinct molecular marker-based selection steps, separating the selection of disease resistance loci from undesirable linked traits. By using specific molecular markers (e.g., NQ0345038, NQ0257326 for Fusarium basal rot resistance) to identify and select only the desired resistance segments, breeders can introgress resistance without inadvertently selecting for complementary pinks traits, thus simplifying the overall breeding process while maintaining reliable disease resistance.
2Productivity
If molecular markers are used to select for disease resistance, then breeding efficiency is improved, but the need for multiple markers and genotyping increases process complexity
Solution Approach 1:
The patent develops a universal set of molecular markers that can simultaneously track multiple disease resistance loci and bulb color traits. These markers serve multiple functions: identifying Fusarium basal rot resistance, pink root resistance, and complementary pinks status all in a single genotyping workflow. This multi-functional marker system increases breeding efficiency by allowing simultaneous selection for multiple traits while avoiding the need for separate, complex genotyping procedures for each trait.
3Measurement precision
If phenotyping assays are used to identify disease resistance, then accurate resistance selection is achieved, but the process becomes costly and time-intensive
Solution Approach 1:
The patent implements preliminary molecular marker-based screening at early breeding stages, allowing breeders to identify plants carrying desired disease resistance loci before conducting time-consuming phenotypic disease assays. By using markers like NQ0257277 and NQ0258453 to pre-select for pink root resistance or NQ0345564 for Fusarium basal rot resistance, the program reduces the number of plants that need to undergo expensive and time-intensive field phenotyping, thereby maintaining accurate resistance selection while significantly reducing breeding cycle time and costs.
Data Source
Figure 1
AI summary
The present disclosure provides for unique onion plants with disease resistance and desirable bulb color and their progeny. Such plants may comprise an introgressed QTL associated with multiple disease resistance coupled with a desirable bulb color. In certain aspects, compositions, including distinct polymorphic molecular markers, and methods for producing, breeding, identifying, selecting, and the like of plants or germplasm with disease resistance and/or desirable bulb color are provided.