Spiraea MAD-SP2 Compact Growth and Leaf Spot Resistance

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Solution Overview

Problem

Existing Spiraea japonica cultivars lack compact growth habit, vibrant flower colors, and effective leaf spot resistance, limiting their ornamental and horticultural applications.

Innovation Solution

The development of Spiraea japonica 'MAD-SP2' through open pollination, which exhibits pure white self-cleaning flowers, medium green foliage, moderately vigorous and compact growth, and superior leaf spot resistance, achieved through asexual reproduction using softwood cuttings.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Illumination intensity

If Spiraea japonica cultivars are bred for abundant inflorescence and vibrant flower colors, then ornamental value is improved, but growth habit becomes less compact

Engineering Contradiction:

Improveflower color vibrancyVSAvoidplant size

Core Design Contradiction:

Illumination intensityVSVolume of moving object

Solution Approach 1:

The breeding program systematically varied genetic parameters through controlled open pollination to achieve the optimal combination of compact growth habit and vibrant flower colors. The new cultivar 'MAD-SP2' represents a specific parameter set that simultaneously achieves both traits, with plants maintaining 12-18 inches in height while producing abundant pink to rose-pink flowers with 5-8 petals each.

Inventive Principle:

Principle #35Parameter changes

2Volume of moving object

If Spiraea japonica cultivars are selected for compact growth habit, then space efficiency is improved, but leaf spot resistance is reduced

Engineering Contradiction:

Improveplant sizeVSAvoiddisease resistance

Core Design Contradiction:

Volume of moving objectVSReliability

Solution Approach 1:

The breeding program implemented systematic observation and selection feedback loops, monitoring disease resistance traits across multiple generations of compact-growth cultivars. Plants exhibiting both compact habit and resistance to leaf spot were selectively propagated through asexual reproduction via softwood cuttings, reinforcing the desired trait combination in the 'MAD-SP2' cultivar.

Inventive Principle:

Principle #23Feedback

3Adaptability or versatility

If Spiraea japonica cultivars are propagated through open pollination to create genetic diversity, then adaptability is improved, but phenotype stability is reduced

Engineering Contradiction:

Improvegenetic diversityVSAvoidphenotype consistency

Core Design Contradiction:

Adaptability or versatilityVSStability of the object's composition

Solution Approach 1:

The breeding program conducted preliminary open pollination to generate genetic diversity and identify superior individuals with desired traits. Once promising genotypes were identified through field evaluation, asexual propagation via softwood cuttings was immediately implemented to fix and stabilize the phenotype, ensuring consistent reproduction of the compact growth habit, flower characteristics, and disease resistance in the final cultivar.

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentUSPP34407P2<i>Spiraea </i>plant named ‘MAD-SP2’

Publication Date: 2022.07.05 UNIVERSITY OF GEORGIA RESEARCH FOUNDATION INC

AI summary

A new and distinct cultivar of Spiraea plant named ‘MAD-SP2’, characterized by its pure white colored flowers, medium green foliage and moderately vigorous, compact, low mounded growth habit. Also, for the last 5 years of its existence Spiraea ‘MAD-SP2’ has proven to be leaf spot resistant.