Solid Heart Romaine Lettuce Disease Resistance Breeding
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Solution Overview
Problem
Current lettuce cultivars lack resistance to corky root rot, Tomato Bushy Stunt Virus, and tip burn, and exhibit slow bolting and downy mildew susceptibility, which leads to significant crop losses and reduced market appeal due to inadequate color intensity and uniformity.
Innovation Solution
Development of the 'Solid Heart' lettuce cultivar through pedigree selection, combining genetic resistance to Tomato Bushy Stunt Virus, corky root rot, and downy mildew, along with tolerance to tip burn and slow bolting, resulting in a genetically uniform and stable romaine lettuce variety with improved color and growth characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional lettuce cultivars are grown, then they can be produced with standard growth characteristics, but they lack resistance to multiple diseases and physiological disorders including corky root rot, Tomato Bushy Stunt Virus, tip burn, and downy mildew
Solution Approach 1:
The patent combines multiple disease resistance traits (corky root rot, Tomato Bushy Stunt Virus, downy mildew, tip burn) and growth characteristics (slow bolting, uniform color) into a single integrated cultivar through controlled breeding programs, creating a unified genetic package that delivers comprehensive protection and performance
2Productivity
If lettuce cultivars with improved disease resistance are developed, then crop loss is reduced, but the breeding process requires extensive time and resource investment
Solution Approach 1:
The patent employs preliminary action by pre-selecting parental lines with specific resistance genes and traits before crossing, and by using marker-assisted selection during the breeding process to accelerate the identification of desired traits, thereby reducing the overall breeding cycle time while maintaining comprehensive disease resistance
3Object-affected harmful factors
If romaine lettuce varieties are cultivated, then they provide elongated upright leaves forming loose heads, but they exhibit susceptibility to downy mildew and tip burn
Solution Approach 1:
The patent applies local quality by introducing specific resistance genes into targeted regions of the romaine lettuce genome while preserving the overall romaine characteristics of elongated upright leaves and loose head formation, achieving localized disease resistance without compromising the distinctive shape and growth habit
4Stability of the object's composition
If existing lettuce varieties are grown, then they can be harvested with standard market characteristics, but they lack uniform color intensity and deep green appearance reducing market appeal
Solution Approach 1:
The patent utilizes parameter changes by selecting and breeding for specific genetic traits that control chlorophyll production and distribution, resulting in enhanced color intensity and uniformity parameters that improve market appeal while maintaining the natural romaine lettuce appearance and composition
Data Source
AI summary
According to the invention, there is provided a novel romaine lettuce cultivar, designated Solid Heart. Solid Heart is described as a vigorous romaine cultivar and recommended for the main lettuce growing regions of California. This invention thus relates to the seeds of lettuce cultivar Solid Heart, to the plants of lettuce cultivar Solid Heart, to plant parts of lettuce cultivar Solid Heart, to methods for producing a lettuce cultivar by crossing the lettuce cultivar Solid Heart with another lettuce cultivar, and to methods for producing a lettuce cultivar containing in its genetic material one or more backcross conversion traits or transgenes and to the backcross conversion lettuce plants and plant parts produced by those methods.