Grape Rootstock 8909-05 Broad Nematode Resistance

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Solution Overview

Problem

Current grape rootstocks lack broad and durable resistance to soil-borne nematodes and grape phylloxera, with existing resistant rootstocks having a narrow genetic base that may promote the evolution of nematode strains capable of feeding on them, and existing pesticides are restricted and ineffective.

Innovation Solution

Development of a new grape rootstock variety '8909-05', a cross of Vitis rupestris 'A. de Serres' × Muscadinia rotundifolia 'Cowart', which exhibits strong and broad resistance to multiple nematode species, including root-knot, dagger, citrus, lesion, and ring nematodes, as well as resistance to grape phylloxera, and potentially induces fanleaf tolerance in scions.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If existing nematode resistant rootstocks (e.g., 'Freedom' and 'Harmony') are used, then resistance to certain nematodes is provided, but resistance to grape phylloxera is lost

Engineering Contradiction:

Improvenematode resistanceVSAvoidresistance spectrum

Core Design Contradiction:

ReliabilityVSAdaptability or versatility

Solution Approach 1:

The patent combines resistance genes from multiple parent varieties (Vitis rupestris 'A. de Serres' and Muscadinia rotundifolia 'Cowart') to create a hybrid rootstock that simultaneously provides resistance to both nematodes and grape phylloxera, merging the protective traits of both parents into a single variety

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The rootstock '8909-05' is a composite hybrid variety incorporating genetic material from two different species, creating a composite genetic structure that provides broad-spectrum resistance to multiple pests including nematodes, phylloxera, and fanleaf virus

Inventive Principle:

Principle #40Composite materials

2Object-affected harmful factors

If pesticides (nematicides and fumigants) are used to control nematodes, then nematode population is reduced, but environmental restrictions and effectiveness limitations increase

Engineering Contradiction:

Improvenematode controlVSAvoidpesticide effectiveness

Core Design Contradiction:

Object-affected harmful factorsVSReliability

Solution Approach 1:

The rootstock variety provides self-protection against nematodes through its inherent genetic resistance, eliminating the need for external pesticide applications and enabling growers to manage nematode infestations through the plant's own defensive capabilities

Inventive Principle:

Principle #25Self-service

3Reliability

If rootstocks with narrow genetic base for nematode resistance are used, then initial nematode resistance is provided, but evolution of adapted nematode strains is promoted

Engineering Contradiction:

Improvenematode resistanceVSAvoidresistance durability

Core Design Contradiction:

ReliabilityVSDuration of action of stationary object

Solution Approach 1:

The patent changes the genetic parameters of the rootstock by creating a hybrid variety with diverse parental genetics, thereby altering the resistance profile to be both effective against current nematode populations and durable against future evolutionary adaptations

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUSPP19981P2Nematode resistant grape rootstock ‘8909-05’

Publication Date: 2009.05.12 RGT UNIV OF CALIFORNIA

AI summary

Rootstock ‘8909-05’ is a cross of Vitis rupestris ‘A. de Serres’×Muscadinia rotundifolia ‘Cowart’. This invention relates to a new and distinct variety of grape rootstock with resistance to a broad array of soil-borne nematodes including root-knot, dagger, citrus, lesion, and ring nematodes. The rootstock also resists grape phylloxera. Rootstock ‘8909-05’ is one of the rare sources of resistance to ring nematode. The rootstock has extremely strong and broad nematode resistance.