Melon Plants with Introgressed ToLCNDV Resistance Alleles
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The outbreak of Tomato leaf curl New Delhi virus (ToLCNDV) has caused significant yield loss and plant death in melon crops, with no commercially available resistant varieties, necessitating the development of sources and methods for ToLCNDV resistance in melon plants.
Innovation Solution
Identification and introgression of specific quantitative trait loci (QTLs) on chromosomes 6, 11, 2, and 12 of the Cucumis melo genome, using genetic markers to select for resistance alleles and develop melon plants with enhanced resistance to ToLCNDV, including the use of marker-assisted selection and site-specific genome modification techniques.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If integrated control measures are established to reduce whitefly spread, then crop damage is reduced, but productivity and yield are still significantly impacted by virus outbreaks
Solution Approach 1:
The patent applies preliminary action by pre-introgressing resistance alleles into elite melon plant varieties before commercial deployment. This advance preparation ensures that when virus outbreaks occur, the plants already possess built-in resistance mechanisms, preventing yield loss rather than merely managing symptoms after infection occurs.
Solution Approach 2:
The patent develops new resistant varieties that replace the need for continuous integrated control measures. Instead of relying on ongoing expensive whitefly management practices, farmers can plant once with inherently resistant varieties, eliminating the need for repeated interventions and providing long-term, cost-effective protection.
2Reliability
If resistance alleles are introgressed from Cucumis melo ssp agrestis, then ToLCNDV resistance is improved, but genetic diversity and breeding complexity increase
Solution Approach 1:
The patent extracts specific resistance alleles from Cucumis melo ssp agrestis and transfers them into elite cultivated melon varieties through controlled introgression. This selective extraction approach isolates only the beneficial resistance genes while leaving the rest of the genome relatively unchanged, maintaining the desirable traits of cultivated varieties while adding disease resistance.
Solution Approach 2:
The patent applies local quality by introducing resistance alleles at specific genomic locations through targeted introgression. The resistance traits are localized to particular chromosomal regions (such as chromosomes 6, 11, 2, and 12), allowing the plants to maintain their overall cultivated characteristics while possessing localized resistance capabilities against ToLCNDV.
3Reliability
If multiple introgressed alleles are combined in elite plants, then resistance to ToLCNDV is enhanced, but manufacturing precision and genetic stability become more difficult to maintain
Solution Approach 1:
The patent merges multiple introgressed resistance alleles into elite melon plant varieties, combining the benefits of different resistance genes at specific chromosomal locations. This merging strategy creates plants with stacked resistance traits that provide enhanced and more durable protection against ToLCNDV while maintaining the elite variety's desirable agronomic characteristics.
Solution Approach 2:
The patent employs marker-assisted selection and genotyping technologies to replace traditional, labor-intensive phenotypic selection methods. This substitution of mechanical/breeding processes with molecular tools enables precise tracking and selection of multiple introgressed alleles, maintaining genetic consistency and stability while enhancing resistance levels across breeding populations.
Data Source
AI summary
Melon plants exhibiting resistance to Tomato leaf curl New Delhi virus (ToLCNDV) are provided, together with methods of producing, identifying, or selecting plants or germplasm with a ToLCNDV resistance phenotype. Such plants include melon plants comprising introgressed genomic regions conferring disease resistance. Compositions, including novel polymorphic markers for detecting plants comprising introgressed disease resistance alleles, are further provided.