Sugana Raspberry Cultivar Fruit Quality and Propagation

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Solution Overview

Problem

Existing raspberry cultivars lack desirable traits such as large fruit size, bright color retention, excellent shelf life, high multiplication rate, and upright habit, which are essential for improved marketability and cultivation efficiency.

Innovation Solution

The development of a new raspberry cultivar 'Sugana' resulting from a cross between 'Autumn Bliss' and 'Tulameen', exhibiting larger fruit, brighter color, improved rooting habit, and higher apical dominancy, leading to increased fruit size, longer shelf life, and enhanced propagation rates.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Manufacturing precision

If conventional raspberry cultivars are used, then cultivation is simpler, but fruit size, color retention, and shelf life are insufficient

Engineering Contradiction:

Improvefruit quality characteristicsVSAvoidcultivation complexity

Core Design Contradiction:

Manufacturing precisionVSDevice complexity

Solution Approach 1:

The patent combines multiple desirable traits from different parent varieties ('Autumn Bliss' for upright habit and apical dominancy, 'Tulameen' for fruit size and rooting habit) into a single hybrid cultivar 'Sugana', achieving large fruit size, bright color retention, and excellent shelf life simultaneously

Inventive Principle:

Principle #5Merging (Combining)

2Productivity

If primocane raspberry varieties are used, then harvest timing is improved, but multiplication rate is typically low

Engineering Contradiction:

Improvemultiplication rateVSAvoidpropagation time

Core Design Contradiction:

ProductivityVSDuration of action of moving object

Solution Approach 1:

The patent achieves an extremely high multiplication rate (up to 280 young plants from one motherplant) by optimizing propagation parameters including rooting conditions under mist, temperature control at 18-19°C, and hormone treatment timing, significantly improving upon typical primocane variety propagation rates

Inventive Principle:

Principle #35Parameter changes

3Shape

If varieties with high apical dominancy are used, then upright habit is improved, but lateral shoot development is reduced

Engineering Contradiction:

Improveplant habitVSAvoidlateral shoot number

Core Design Contradiction:

ShapeVSQuantity of substance

Solution Approach 1:

The patent achieves a balanced distribution where apical dominancy is maintained for upright plant architecture (3-4 laterals only), while ensuring each lateral produces high-quality fruit with large size and bright color, creating local optimization at different plant levels

Inventive Principle:

Principle #3Local quality

4Volume of moving object

If fruit size is increased, then marketability is improved, but shelf life may be compromised

Engineering Contradiction:

Improvefruit sizeVSAvoidshelf life

Core Design Contradiction:

Volume of moving objectVSReliability

Solution Approach 1:

The patent creates a composite fruit structure with big drupelets (100-120 per fruit) and optimized flesh-to-seed ratio, combining traits from both parents to achieve large fruit size (28-29mm length) while maintaining firm flesh and excellent shelf life for marketing up to ten days after harvest

Inventive Principle:

Principle #40Composite materials

Data Source

PatentUSPP21357P3Variety of Rubus plant named `Sugana`

Publication Date: 2010.10.05 LUBERA

AI summary

A new and distinct cultivar of Rubus plant named ‘Sugana’ having bright colored and large fruits with a long shelf life.