Hybrid Tea Rose JACormag Breeding for Large Flowers and Long Stems
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Solution Overview
Problem
The challenge lies in developing a new hybrid tea rose variety that combines the large flower size and vigorous plant growth of one parent with the long stems and own root vigor of another, while also achieving distinct flower colors and improved propagation characteristics.
Innovation Solution
The new rose variety 'JACormag' is created by crossing 'JACmag' with an unnamed Red Hybrid Tea rose, resulting in large flowers, vigorous upright growth, and long cutting stems, with successful asexual reproduction from softwood cuttings, and exhibiting unique flower colors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If crossing is performed to combine traits from different parents, then flower size and plant vigor are improved, but flower color uniformity and genetic stability may be compromised
Solution Approach 1:
The breeding program segmented the inheritance of different traits by performing multiple controlled crosses between specific parent varieties with desirable characteristics. Each cross targeted specific trait combinations, allowing systematic improvement of flower size while maintaining genetic stability through selective breeding rather than random mutation.
Solution Approach 2:
The invention changed genetic parameters through controlled hybridization, combining alleles from different parent varieties to achieve superior flower size and vigor. The cross between 'JACmag' and the unnamed red hybrid tea rose introduced new genetic variations while maintaining species-level genetic stability.
2Volume of moving object
If selection for large flower size is intensified, then flower diameter increases, but stem length and cutting quality may be reduced
Solution Approach 1:
The breeding program applied local quality selection by evaluating and selecting for specific local traits (flower size, stem length, cutting quality) independently in different plant parts. This allowed optimization of flower diameter in the floral portion while maintaining stem length and overall plant architecture through separate selection criteria.
Solution Approach 2:
The selection process was dynamic, adjusting the relative importance of different traits based on the breeding generation and specific breeding goals. Early generations focused on establishing hybrid vigor and basic flower size, while later selections refined stem length and cutting quality alongside flower dimensions.
3Productivity
If propagation from softwood cuttings is optimized, then multiplication rate increases, but rooting success and plant vigor may be compromised
Solution Approach 1:
The breeding program performed preliminary selection and acclimatization of mother plants before taking cuttings. Plants were allowed to mature and establish strong root systems in the first two years of growth, ensuring that subsequent softwood cuttings would have higher rooting success rates and better vigor while maintaining high multiplication rates.
Solution Approach 2:
The propagation system utilized the plant's own physiological characteristics and natural rooting ability. Softwood cuttings were taken during the optimal growth period when the plant naturally produces hormones and nutrients that promote rooting, eliminating the need for external rooting aids while maintaining high success rates.
Data Source
AI summary
Hybrid tea rose plant named ‘JACormag’ having very large flowers; long cutting stems; vigorous, upright, well branched growth; and the ability to propagate well from softwood cuttings.