Geum Cultivar With Stable Semi-Double Yellow Blooming

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

There is a need for a novel Geum cultivar that exhibits unique flower and bloom characteristics, such as semi-double yellow flowers and a long bloom period, which are stable under various environmental conditions and can be reproduced through asexual reproduction methods.

Innovation Solution

The development of the Geum cultivar 'MACGEU050', which is the result of controlled cross-pollination and asexual reproduction via meristematic tissue culture, ensuring consistent traits like clump-forming growth habit and semi-double yellow flowers, and a bloom period from April through July.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Manufacturing precision

If controlled cross-pollination breeding is performed to create new Geum cultivars with unique flower characteristics, then the flower and bloom characteristics are improved, but the stability of traits under varying environmental conditions and reproducibility through asexual reproduction may be compromised

Engineering Contradiction:

Improveflower and bloom characteristicsVSAvoidtrait stability and reproducibility

Core Design Contradiction:

Manufacturing precisionVSReliability

Solution Approach 1:

The inventors performed preliminary controlled cross-pollination breeding to develop the unique flower characteristics of 'MACGEU050' before establishing its reproducibility through asexual reproduction. The breeding program was conducted in advance to create the desired semi-double yellow flowers and long bloom period, which were then stabilized through tissue culture propagation.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The cultivar 'MACGEU050' is reproduced through asexual reproduction via meristematic tissue culture, creating exact genetic copies of the parent plant. This copying method ensures that the unique flower characteristics developed through cross-pollination are precisely replicated in subsequent generations without genetic variation.

Inventive Principle:

Principle #26Copying

2Reliability

If asexual reproduction via meristematic tissue culture is used to propagate the cultivar, then trait consistency and reproducibility are improved, but the complexity of the propagation process increases

Engineering Contradiction:

Improvetrait consistencyVSAvoidpropagation process complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The natural sexual reproduction process is replaced with meristematic tissue culture technology, substituting mechanical/biological cross-pollination with an in vitro propagation system. This substitution enables precise control over the propagation process and ensures genetic consistency, despite the increased technical complexity of tissue culture procedures.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Manufacturing precision

If the cultivar is developed through controlled cross-pollination with an unnamed pollen parent, then unique flower characteristics are achieved, but the ability to reproduce the cultivar true to type may be compromised

Engineering Contradiction:

Improveunique flower characteristicsVSAvoidreproducibility

Core Design Contradiction:

Manufacturing precisionVSEase of manufacture

Solution Approach 1:

Instead of attempting to reproduce the cultivar through sexual reproduction (which would require the unnamed pollen parent), the approach is inverted by using asexual reproduction via tissue culture. This inversion eliminates the need for the original parental plants and enables straightforward propagation of the unique characteristics without requiring the unavailable pollen parent.

Inventive Principle:

Principle #13The other way round (Inversion)

Data Source

PatentUSPP37342P3<i>Geum </i>plant named ‘MACGEU050’

Publication Date: 2026.03.24 ELIZABETH MACGREGORS NURSERY

AI summary

‘MACGEU050’ is a new and distinctive variety of Geum hybrid which is characterized by a clump-forming growth habit, yellow semi-double flowers held on compound cymes above the foliage, and a long bloom period. The new variety propagates successfully by stem cuttings and tissue culture and has shown to be uniform and stable in the resulting generations from asexual propagation.