Cherry Rootstock Breeding for Precocity and Mildew Resistance

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Solution Overview

Problem

Existing cherry rootstocks do not adequately address precocity, flowering timing, and mildew resistance, while also maintaining stable genetic traits across varying environmental conditions.

Innovation Solution

The introduction of the Prunus vulgaris x maacki 'RVL-4' rootstock, which exhibits high precocity, mildew resistance, and induces healthy lateral branch development, and is stable across different environmental conditions.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If existing cherry rootstocks are used, then they provide basic support for cherry trees, but they do not adequately address precocity, flowering timing, and mildew resistance

Engineering Contradiction:

Improvemildew resistanceVSAvoidprecocity and flowering timing control

Core Design Contradiction:

ReliabilityVSAdaptability or versatility

Solution Approach 1:

The patent applies parameter changes by selecting and crossing specific parent varieties with distinct genetic parameters related to precocity, flowering timing, and mildew resistance. The cross between Prunus vulgaris x maacki 'Rubin' and Prunus lannesiana 'L2' combines different genetic parameters to produce a rootstock with improved precocity (one year increase), delayed flowering (two weeks), and enhanced mildew resistance, thereby resolving the contradiction between reliability and adaptability.

Inventive Principle:

Principle #35Parameter changes

2Measurement precision

If the new cultivar is tested under all possible environmental conditions, then complete performance data would be obtained, but the phenotype may vary with environmental factors such as temperature, day length, and light intensity

Engineering Contradiction:

Improveperformance data accuracyVSAvoidgenetic stability across environments

Core Design Contradiction:

Measurement precisionVSStability of the object's composition

Solution Approach 1:

The patent addresses this contradiction by establishing that while phenotypic expression may vary with environmental parameters (temperature, day length, light intensity), the genotypic composition remains stable. The breeding program has fixed the genetic parameters through controlled crosses and selection, ensuring that the core characteristics (precocity, flowering timing, mildew resistance) are genetically determined and will not change despite environmental variations.

Inventive Principle:

Principle #35Parameter changes

3Stability of the object's composition

If the rootstock is propagated by vegetative cuttings, then true-to-type reproduction is achieved, but the process requires multiple years of testing to confirm stability

Engineering Contradiction:

Improvetrue-to-type reproductionVSAvoidtesting duration

Core Design Contradiction:

Stability of the object's compositionVSLoss of time

Solution Approach 1:

The patent applies preliminary action by performing vegetative propagation by cuttings early in the breeding program (starting in 2004) to immediately test for true-to-type reproduction. This preliminary propagation method allows rapid multiplication and testing of the new cultivar's genetic stability without waiting for seed propagation, which would take multiple years. The preliminary testing has confirmed stability across 15 years, reducing the overall time needed to validate the cultivar.

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentUS20260060155P1Prunus rootstock named 'RVL-4'

Publication Date: 2026.02.26 EREMIN GENNADY

AI summary

A new and distinct cultivar of Prunus rootstock tree named ‘RVL-4’ is disclosed, characterized by high precocity and mildew resistance. ‘RVL-4’ is suitable for use as a rootstock upon which commercial fruit bearing sweet cherry varieties may be budded or grafted. The new variety is a Prunus vulgaris x maacki x lannesiana, typically produced for rootstock.