Downy Mildew Resistant Impatiens via Genetic Introgression
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Solution Overview
Problem
Impatiens downy mildew, caused by Plasmopara obducens, is a destructive foliar disease affecting Impatiens walleriana, leading to defoliation and plant collapse, especially in moist conditions, with widespread outbreaks in North America, and existing methods lack effective resistance mechanisms.
Innovation Solution
Development of Impatiens plants with genetic resistance to downy mildew, utilizing the genetic source from Impatiens sp. T041, which includes introgressed loci and markers such as SEQ ID NO:24 and SEQ ID NO:27, to confer resistance, and a method for producing downy mildew-resistant seeds through crossing and inbreeding, along with marker-assisted selection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional Impatiens walleriana cultivars are grown in landscape plantings, then they provide ornamental value and aesthetic appeal, but they are highly susceptible to downy mildew disease caused by Plasmopara obducens, leading to defoliation and plant collapse
Solution Approach 1:
The patent applies parameter changes by modifying the genetic composition of Impatiens walleriana through introgression of resistance genes from wild Impatiens species. This changes the biological parameter of disease susceptibility, transforming susceptible cultivars into resistant ones while maintaining ornamental characteristics. The genetic parameter alteration enables the plant to resist Plasmopara obducens infection without sacrificing aesthetic value.
2Reliability
If new downy mildew resistant Impatiens varieties are developed through breeding programs, then resistance to Plasmopara obducens is achieved, but the development process requires extensive time for crossing, selection, and field testing across multiple generations
Solution Approach 1:
The patent employs preliminary action by pre-identifying and characterizing downy mildew resistance genes in wild Impatiens species before initiating breeding programs. Resistance genes are isolated, characterized, and validated in advance, allowing for more efficient introgression into cultivated varieties. This preliminary genetic characterization reduces the time required for subsequent breeding and selection processes by providing known resistance sources.
Solution Approach 2:
The patent implements feedback mechanisms through systematic field testing and evaluation of breeding progeny for downy mildew resistance. Multiple field trials across different environments provide feedback on the effectiveness of resistance genes and their stability. This feedback loop allows breeders to select the most effective resistance sources and monitor the performance of new varieties, accelerating the development process by identifying successful combinations more quickly.
3Reliability
If regional outbreaks of downy mildew occur in landscape beds, then the disease spreads across multiple states and regions, but detection and management are delayed due to variable occurrence timing and lack of early warning systems
Solution Approach 1:
The patent applies preliminary action by developing and deploying resistant Impatiens varieties before widespread disease outbreaks occur. By pre-introducing resistance genes into commercially viable cultivars, the patent enables landscape plantings to be established with built-in resistance, preventing rather than merely detecting and responding to outbreaks. This proactive approach eliminates the need for reactive disease management and reduces response time to zero by preventing infection in the first place.
Data Source
AI summary
The present disclosure provides seed and plants of downy mildew resistant Impatiens plants. The present disclosure thus relates to the plants, seeds, and tissue cultures of downy mildew resistant Impatiens plants, to methods for producing a downy mildew resistant plant of the present disclosure by crossing such plants with themselves or with another Impatiens plant, such as a plant of another genotype, variety, or cultivar, and methods of identifying downy mildew resistant Impatiens plants. The present disclosure further relates to seeds and plants produced by such crossing. The present disclosure further relates to parts of such plants. The present disclosure also relates to methods of identifying an Impatiens plant having resistance to downy mildew.