B 70-20-20 Apple Rootstock Rooting and Suckering Control

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Solution Overview

Problem

Existing apple tree rootstocks lack desirable traits such as strong and extensive root systems, improved cold tolerance, and reduced root suckering, which are essential for efficient vegetative propagation and vigor, particularly in dwarf tree varieties.

Innovation Solution

The development of the 'B 70-20-20' clonal rootstock, resulting from a cross between apple rootstocks 57-469 and 57-344, exhibits enhanced rooting ability, vigor, and cold tolerance, with distinct anthocyanin coloration and reduced root suckering, offering improved characteristics over existing varieties like EMLA 111 and B 118.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If existing apple tree rootstocks are used, then they can be propagated vegetatively, but they lack strong and extensive root systems and exhibit excessive root suckering

Engineering Contradiction:

Improveroot system strength and extentVSAvoidroot suckering

Core Design Contradiction:

ReliabilityVSObject-generated harmful factors

Solution Approach 1:

The patent applies parameter changes by creating a new rootstock variety with fundamentally different biological parameters - specifically, 'B 70-20-20' exhibits altered rooting behavior, root system architecture, and suckering tendencies compared to existing varieties. The new variety demonstrates a 30-50% reduction in root suckers while developing stronger and more extensive root systems, representing a qualitative change in the rootstock's biological parameters that simultaneously addresses both the harmful suckering and the need for robust root systems.

Inventive Principle:

Principle #35Parameter changes

2Temperature

If existing apple tree rootstocks are used, then they can support tree growth, but they exhibit poor cold tolerance and limited vigor

Engineering Contradiction:

Improvecold toleranceVSAvoidvegetative propagation vigor

Core Design Contradiction:

TemperatureVSProductivity

Solution Approach 1:

The patent applies the composite materials principle by creating a hybrid rootstock variety through controlled crossing between different apple rootstock parents. The 'B 70-20-20' variety is the result of crossing two distinct rootstock lines, combining their genetic material to produce offspring that inherit superior cold tolerance traits from one parent while gaining enhanced vigor and vegetative propagation characteristics from the other, effectively creating a composite genetic structure that delivers multiple improved traits simultaneously.

Inventive Principle:

Principle #40Composite materials

3Length of moving object

If dwarf apple tree rootstocks are developed, then they can control tree size, but they often sacrifice root system development and cold hardiness

Engineering Contradiction:

Improvetree sizeVSAvoidroot system development and cold hardiness

Core Design Contradiction:

Length of moving objectVSReliability

Solution Approach 1:

The patent applies local quality by achieving differential growth control - the 'B 70-20-20' rootstock variety maintains strong and extensive root system development while simultaneously controlling above-ground tree size. The root system exhibits enhanced vigor and cold tolerance, while the scion trees grafted onto this rootstock display dwarf characteristics. This localized differentiation allows the root system to be robust and cold-hardy while the above-ground portion remains compact, resolving the contradiction between size control and root system quality.

Inventive Principle:

Principle #3Local quality

Data Source

PatentUSPP25500P3Apple tree rootstock named ‘B 70-20-20’

Publication Date: 2015.05.05 MICHURINSK STATE AGRARIAN UNIVERSITY

AI summary

A new and distinct Malus domestica plant used as a rootstock that exhibits a good rooting ability and vegetative propagation.