Cucumber Yield QTL Stacking for Stable Fruit Yield Gains
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Solution Overview
Problem
There is a need for identifying Quantitative Trait Loci (QTLs) to increase fruit yield in cultivated cucumbers, as yield improvements have been limited in modern cucumber varieties.
Innovation Solution
Introduction of QTL2.1 and QTL6.1 from wild cucumber or its relatives into cultivated cucumber plants, along with introgression fragments on chromosomes 2 and 6, which enhance fruit yield.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional breeding methods are used to improve cucumber yield, then some yield increase may be achieved, but the improvement is limited and insufficient to meet modern agricultural demands
Solution Approach 1:
The patent segments the yield improvement goal into multiple independent QTLs (QTL2.1 on chromosome 2 and QTL6.1 on chromosome 6) that can be individually identified, validated, and combined through marker-assisted selection. This segmentation allows systematic breeding approaches to accumulate multiple yield-enhancing alleles, overcoming the limitations of conventional single-trait selection and achieving more reliable and substantial yield improvements.
2Productivity
If wild cucumber genetic material is introduced into cultivated varieties, then fruit yield and weight are significantly increased, but the risk of introducing unwanted traits or reducing adaptability may arise
Solution Approach 1:
The patent applies the extraction principle by identifying and isolating specific yield-enhancing QTLs (QTL2.1 and QTL6.1) from wild cucumber genetic material. Through precise molecular marker identification and validation, only the beneficial yield-related genetic segments are extracted and transferred to cultivated varieties, while leaving behind potential harmful or unwanted traits in the wild parent population. This selective extraction enables yield improvement without compromising cultivar adaptability.
Solution Approach 2:
The patent implements local quality by introducing specific localized genetic regions (QTL2.1 on chromosome 2 and QTL6.1 on chromosome 6) that confer yield enhancement, rather than introducing entire wild genomes or large chromosomal segments. This localized approach ensures that only the specific functional regions responsible for increased fruit yield and weight are transferred, maintaining the overall adaptability and genetic integrity of the cultivated cucumber background.
3Productivity
If multiple QTLs are combined to maximize yield improvement, then fruit yield and weight increase significantly, but the complexity of breeding programs and molecular marker analysis increases
Solution Approach 1:
The patent merges multiple independent yield-enhancing QTLs (QTL2.1 on chromosome 2 and QTL6.1 on chromosome 6) into single cultivated cucumber varieties through marker-assisted selection. By combining these validated QTLs in a coordinated breeding program, the patent achieves synergistic yield improvements that exceed what could be obtained from single QTL introduction, while the standardized molecular marker system helps manage the complexity of multi-QTL stacking.
Data Source
AI summary
The present invention relates to cultivated cucumber plants comprising a yield QTL on chromosome 2 of their genome.