VX211 Walnut Rootstock Nematode Resistance

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Solution Overview

Problem

Existing walnut rootstocks lack sufficient resistance to nematodes (Pratylenchus vulnus) and Phytophthora (Phytophthora citricola), leading to damage and reduced vigor in walnut trees.

Innovation Solution

The development of a new clonal rootstock 'VX211' of the 'Paradox' walnut tree (Juglans hindsii×Juglans regia) that exhibits increased resistance to nematodes and Phytophthora, and can be easily propagated through standard tissue culture micropropagation, maintaining vigor and survivability in nursery and orchard conditions.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If standard walnut rootstocks are used, then they are available and can be propagated, but they lack sufficient resistance to nematodes and Phytophthora

Engineering Contradiction:

Improveresistance to nematodes and PhytophthoraVSAvoidavailability and ease of propagation

Core Design Contradiction:

ReliabilityVSAdaptability or versatility

Solution Approach 1:

The patent applies parameter changes by selecting and propagating a specific clone (VX211) with altered genetic parameters that confer enhanced resistance to nematodes and Phytophthora while maintaining the desirable propagation characteristics of standard Paradox rootstocks. This involves changing the genetic composition parameter of the rootstock to achieve both disease resistance and ease of propagation.

Inventive Principle:

Principle #35Parameter changes

2Productivity

If existing Paradox rootstocks are used, then they can be propagated through standard methods, but they show susceptibility to nematode damage and reduced vigor

Engineering Contradiction:

Improvevigor and growth performanceVSAvoidsusceptibility to nematodes and Phytophthora

Core Design Contradiction:

ProductivityVSObject-affected harmful factors

Solution Approach 1:

The patent changes the genetic parameters of the Paradox rootstock by selecting clone VX211, which exhibits altered resistance parameters against nematodes and Phytophthora while maintaining vigor and productivity. This parameter change resolves the contradiction between productivity and susceptibility to harmful factors.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent converts the harmful effect of nematode and Phytophthora pressure into a beneficial selection criterion. By exposing rootstocks to these pathogens and selecting those that survive and thrive (like VX211), the harmful factors become tools for identifying and propagating resistant clones, thus converting harm into benefit.

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

3Reliability

If resistant rootstock varieties are developed, then resistance to pests and diseases improves, but propagation difficulty may increase

Engineering Contradiction:

Improveresistance to Phytophthora citricolaVSAvoidease of micropropagation

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The patent applies parameter changes by identifying clone VX211 whose genetic parameters include both disease resistance and ease of micropropagation. This specific parameter combination resolves the contradiction between reliability (disease resistance) and ease of manufacture (micropropagation capability).

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUSPP21179P3Walnut rootstock `VX211`

Publication Date: 2010.08.03 RGT UNIV OF CALIFORNIA

AI summary

A new and distinct variety of walnut rootstock denominated ‘VX211’ is described. This new variety, ‘VX211’, can be propagated through standard tissue culture micropropagation or rooted cuttings. ‘VX211’ has vigor and survivability in the nursery and in the orchard. It has reduced susceptibility to damage from nematodes (Pratylenchus vulnus) compared to other ‘Paradox’ rootstock. ‘VX211’ also has reduced susceptibility to damage from Phytophthora citricola in greenhouse screens and in the field compared to other ‘Paradox’ rootstock.