QTL-1 Locus Confers ToLCNDV Resistance in Melon Plants
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Solution Overview
Problem
Current control measures for Tomato Leaf Curl New Delhi virus (ToLCNDV) in melon plants are limited, and no resistant or tolerant melon cultivars have been described, leading to significant commercial losses due to virus-induced symptoms like yellowing, leaf curling, and fruit deformation.
Innovation Solution
Development of a melon plant with a Quantitative Trait Locus (QTL-1) that confers resistance to ToLCNDV, inherited in a monogenic and partially dominant manner, allowing for high resistance when homozygous and intermediate resistance when heterozygous, which can be incorporated into various melon types through conventional breeding or genetic modification.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional control measures (cultural practices, phytosanitary measures, chemical treatments) are used against ToLCNDV, then some level of virus control is achieved, but the measures are limited and do not provide sufficient resistance, leading to significant commercial losses
Solution Approach 1:
The patent applies parameter changes by introducing a specific genetic parameter (QTL-1) into the melon plant genome that fundamentally changes the plant's resistance parameter to ToLCNDV. The QTL-1 locus alters the plant's physiological response to the virus, providing reliable resistance that prevents the severe symptoms and commercial losses associated with conventional susceptible cultivars.
2Object-affected harmful factors
If no resistant cultivars are available, then breeders must rely on limited control measures, but this results in severe yellowing, leaf curling, and fruit deformation that suppress fruit production
Solution Approach 1:
The QTL-1 locus changes the plant's genetic parameters to prevent virus infection and symptom development. By modifying the plant's genetic composition at the QTL-1 locus, the patent eliminates the harmful virus effects (yellowing, leaf curling, fruit deformation) while maintaining normal fruit production capabilities.
3Reliability
If resistant cultivars are developed through conventional breeding, then resistance may be achieved, but the process is time-consuming and no resistant melon cultivars have been described to date
Solution Approach 1:
The patent extracts the resistance trait from complex polygenic inheritance and isolates it as a single, identifiable QTL-1 locus. This extraction allows breeders to work with a discrete, well-defined genetic element rather than attempting to select for resistance from multiple interacting genes, significantly accelerating the breeding process.
Solution Approach 2:
The patent replaces traditional, time-consuming phenotypic selection methods with molecular marker-based selection at the QTL-1 locus. By using DNA markers linked to the resistance allele, breeders can identify resistant plants at the seedling stage without waiting for virus exposure and symptom expression, dramatically reducing the time required to develop resistant cultivars.
Data Source
AI summary
The present invention relates to a cultivated melon (Cucumis melo spp. melo) plant resistant against Tomato Leaf Curl New Delhi virus (ToLCNDV), which comprises QTL-1 in its genome, and which QTL-1 confers resistance against Tomato Leaf Curl New Delhi virus (ToLCNDV). The invention further provides progeny, fruit, seeds, propagation material and food products from the plant. The invention also provides markers for the identification of QTL-1, as well as a method for testing a melon (Cucumis melo spp. melo) plant for the presence of QTL-1 in its genome and a method for selecting or identifying a melon plant resistant against ToLCNDV. Also provided is a method for producing a melon (Cucumis melo spp. melo) plant which is resistant against Tomato Leaf Curl New Delhi virus (ToLCNDV).