Ivanhoe Walnut Cultivar Early Harvest Breeding
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Solution Overview
Problem
There is a need for walnut tree cultivars that can produce large, high-quality nuts with light-colored kernels and are ready for harvest earlier in the season to facilitate earlier commercial harvesting and shipment, as existing cultivars like 'Chandler' have later harvesting dates.
Innovation Solution
The development of the 'Ivanhoe' walnut tree cultivar, resulting from a controlled cross between 'Chico' and 'UC67-13', which is protogynous, bearing female flowers before male flowers, and is asexually reproduced on 'Paradox' rootstock, resulting in large-sized walnuts with light-colored kernels and an approximately 4-week earlier harvest date compared to 'Chandler'.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the walnut tree cultivar 'Chandler' is used, then large crops of high-quality nuts are produced, but the harvest date is later in the season
Solution Approach 1:
The patent applies parameter changes by selectively breeding and selecting for specific genetic traits that alter the harvest timing parameter while preserving other desirable characteristics. The 'Ivanhoe' cultivar was developed through controlled pollination and multiple generations of selection to achieve an earlier harvest date (approximately 4 weeks before 'Chandler') while maintaining large crop production and high nut quality. This represents a fundamental change in the temporal parameter of the cultivar's development cycle.
2Reliability
If the walnut tree cultivar 'Chandler' is used, then high-quality nuts are produced, but the harvest is not ready early in the season
Solution Approach 1:
The invention changes the temporal parameter of harvest timing through genetic selection. The 'Ivanhoe' cultivar exhibits consistent early harvest timing (ready approximately 4 weeks before 'Chandler') while maintaining reliable nut quality characteristics including light-colored kernels, proper shell thickness, and desirable size. This parameter change was achieved through systematic breeding and selection over multiple generations.
3Loss of time
If early harvest is achieved, then commercial shipping is facilitated, but nut size consistency may be compromised
Solution Approach 1:
The patent simultaneously optimizes multiple parameters including harvest date, nut size, and size uniformity. The 'Ivanhoe' cultivar produces nuts with consistent size characteristics (generally large-sized with good uniformity) while maintaining the early harvest date. This multi-parameter optimization was achieved through selective breeding that considered size consistency alongside harvest timing and overall nut quality.
Data Source
AI summary
A new and distinct variety of walnut tree denominated ‘Ivanhoe’ is described. This new variety, ‘Ivanhoe’, comes into bearing young, with an excellent yield. ‘Ivanhoe’ forms large-sized walnuts that possess light-colored kernels with little size variation in a given harvest. ‘Ivanhoe’ bears fruit terminally and laterally and yields a crop that can be harvested approximately 4 weeks before ‘Chandler’ (U.S. Plant Pat. No. 4,388). ‘Ivanhoe’ is also protogynous, bearing female flowers before male flowers.