Dragon Fruit DF2 Variety Canker Tolerance and Fruit Quality

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Solution Overview

Problem

Current varieties of Hylocereus undatus lack attractive fruit characteristics and tolerance to canker diseases, limiting their potential in the market.

Innovation Solution

The development of the 'DF2' variety, resulting from a controlled cross between 'RF' and 'LD5', which exhibits medium-sized fruits with medium red to purple flesh, dark pink to red skin, and tolerance to Neoscytalidium dimidiatum canker, achieved through asexual propagation and in vitro methods, ensuring stable transmission of desirable traits.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If conventional Hylocereus undatus varieties are cultivated, then they can be grown and harvested, but they lack attractive fruit characteristics and tolerance to canker diseases

Engineering Contradiction:

Improvecanker toleranceVSAvoidcanker disease susceptibility

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent applies parameter changes by creating a new variety through controlled crossing that fundamentally alters the plant's genetic parameters to achieve canker tolerance. The 'DF2' variety exhibits different physiological and immunological parameters compared to parent varieties, enabling resistance to Neoscytalidium dimidiatum canker while maintaining fruit quality attributes.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent combines desirable traits from two different parent varieties ('RF' and 'LD5') through controlled crossing, creating a composite genetic structure in the 'DF2' variety. This composite approach integrates canker tolerance from one parent with attractive fruit characteristics from the other, resulting in a variety that possesses both disease resistance and marketable fruit quality.

Inventive Principle:

Principle #40Composite materials

2Reliability

If new variety traits are developed through breeding, then canker tolerance and fruit quality improve, but stability of transmitted characteristics through propagation must be ensured

Engineering Contradiction:

Improvetrait stabilityVSAvoidcharacteristic consistency across propagations

Core Design Contradiction:

ReliabilityVSStability of the object's composition

Solution Approach 1:

The patent employs asexual propagation through cuttings and in vitro methods to create exact genetic copies of the 'DF2' variety. This copying process ensures that all desirable traits including canker tolerance and fruit characteristics are identically replicated in subsequent generations, maintaining characteristic consistency without genetic variation.

Inventive Principle:

Principle #26Copying

Solution Approach 2:

Instead of relying on traditional seed propagation that may introduce genetic variation, the patent inverts the approach by using asexual propagation methods. This inversion ensures clonal reproduction where the offspring are genetically identical to the parent, guaranteeing trait stability and characteristic consistency across all propagations.

Inventive Principle:

Principle #13The other way round (Inversion)

Data Source

PatentUSPP33586P2Dragon fruit plant named ‘DF2’

Publication Date: 2021.11.02 THE NEW ZEALAND INSITUTE FOR PLANT AND FOOD RESEARCH LIMITED

AI summary

A new and distinct dragon fruit plant is described. The variety resulted from selection among a population of seedlings derived from a controlled cross carried out in 2013 between RF (seed parent) (not patented) and ‘LD5’ (pollen parent) (not patented) located in Tien Giang, Viet Nam. The variety was selected due to its appearance, eating quality and canker tolerance.