Floribunda Rose GRAtusc Heat-Resistant Color Shift
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Solution Overview
Problem
There is a need for a new Rosa hybrid cultivar that combines desirable traits such as strong fragrance, disease resistance, and unique flower color, which existing Rosa hybrid varieties have not effectively addressed.
Innovation Solution
The development of Rosa hybrid 'GRAtusc' through controlled cross-pollination, exhibiting an upright to semi-weeping growth habit, pink blended yellow flowers turning terracotta with summer heat, nearly continuous flowering, and excellent resistance to black spot and powdery mildew, achieved through asexual propagation using softwood stem cuttings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If existing Rosa hybrid varieties are used, then they have been commercially available, but they have not effectively combined strong fragrance, disease resistance, and unique flower color
Solution Approach 1:
The patent combines multiple desirable traits (strong fragrance, disease resistance, unique flower color) into a single Rosa hybrid cultivar through controlled cross-pollination breeding. The new cultivar merges the fragrance characteristics of one parent with the disease resistance and color characteristics of another parent, creating a unified plant that exhibits all three traits simultaneously.
2Adaptability or versatility
If new Rosa hybrid cultivars are developed through controlled cross-pollination, then unique traits can be achieved, but the breeding process requires extensive trialing and evaluation time
Solution Approach 1:
The patent employs preliminary action by conducting extensive trialing and evaluation of parent plants before crossing them. The female parent was trialed for fragrance and color, the male parent for modern flower color, and both were evaluated for disease resistance before the controlled cross-pollination. This preliminary selection and testing phase ensures that the resulting cultivar inherits desired traits, reducing the need for extensive backcrossing and re-trialing.
3Stability of the object's composition
If Rosa hybrid varieties are propagated asexually, then genetic stability is maintained, but propagation efficiency must be optimized
Solution Approach 1:
The patent employs self-service through asexual propagation by softwood stem cuttings, where the plant propagates itself without requiring complex external intervention. The cutting method allows the plant to naturally form roots when placed in appropriate propagation media, maintaining genetic stability while enabling efficient multiplication of the cultivar.
Data Source
AI summary
‘GRAtusc’ is a new and distinct floribunda type Rosa hybrid cultivar which is characterized by the combination of an upright to semi-weeping, bushy growth habit, nearly continuous flowering, with flowers that exhibit a distinct pink blended yellow color becoming terracotta with summer heat and the stability of these characteristics from generation to generation. The new cultivar is generally suited to landscape applications.