CVYV-Resistant Watermelon Plants via Wild Introgression
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current methods lack effective resistance against Cucumber Vein Yellowing Virus (CVYV) in watermelon plants, leading to significant crop damage and reduced fruit quality due to internal necrosis, which is often inconspicuous and results in unsuitable fruits for consumption.
Innovation Solution
Development of CVYV-resistant watermelon plants with a recessive Quantitative Trait Locus (QTL) on chromosome 3, introgressed from wild watermelon accessions, utilizing tightly linked SNP markers for breeding and selection to confer resistance, and potentially combining with ZYMV resistance for double resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If cultivated watermelon plants are used, then fruit quality with high brix level is maintained, but resistance against CVYV is lacking
Solution Approach 1:
The invention introduces the CVYV resistance locus (cyv_3.1) from wild watermelon accessions into cultivated watermelon varieties through marker-assisted selection before the virus infection occurs. This preliminary genetic modification ensures that the plants possess resistance traits prior to exposure to harmful environmental factors, preventing internal necrosis while maintaining cultivated fruit quality characteristics.
2Reliability
If wild watermelon accessions are used for CVYV resistance, then resistance is achieved, but fruit quality with high brix level is lost
Solution Approach 1:
The invention segments the genome by selectively introgressing only the specific resistance locus (cyv 3.1) from wild watermelon accessions into cultivated watermelon varieties, rather than transferring entire wild genomes. This targeted approach allows the resistance trait to be separated from undesirable traits (bitter taste, low brix), achieving resistance while preserving fruit quality.
Solution Approach 2:
The invention applies local quality by introducing the resistance locus at a specific chromosomal location (chromosome 3) in cultivated watermelon varieties. This localized genetic modification ensures that only the resistance function is acquired from wild accessions, while the rest of the genome maintains the high brix and desirable quality characteristics of cultivated varieties.
3Measurement precision
If traditional breeding methods are used, then selection process is simple, but identification of CVYV resistance locus is difficult
Solution Approach 1:
The invention uses SNP markers as intermediary tools to detect and select plants carrying the cyv 3.1 resistance locus. These molecular markers serve as proxies that indirectly indicate the presence of the resistance gene, enabling precise identification of resistant plants without requiring complex phenotypic testing or direct observation of resistance expression.
Data Source
Figure 1
AI summary
The application relates to the field of plant breeding, in particular watermelon breeding. Provided are CVYV resistant watermelon plants (and seeds from which these plants can be grown). Also provided is a QTL for CVYV resistance (cyv_3.1) and markers and methods for screening plants for the presence of the QTL.