Apple Tree Variety With Earlier Red Coloration for Timely Harvest

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Solution Overview

Problem

Existing apple varieties like 'Fuji' lack early and complete red fruit coloration, which complicates optimal harvesting timing and affects commercial viability.

Innovation Solution

A new apple variety, 'MAIA-MITCHELL', derived from a limb mutation of 'MAIA1', exhibits up to 90% strong-red coloration eight weeks earlier than its parent, ensuring earlier and more complete red coloring, facilitating timely harvests.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Loss of time

If existing apple varieties like 'Fuji' are used, then the fruit can be harvested and stored, but the fruit coloration is delayed and incomplete, affecting optimal harvest timing

Engineering Contradiction:

Improvetime to achieve optimal fruit colorationVSAvoidfruit coloration completeness

Core Design Contradiction:

Loss of timeVSManufacturing precision

Solution Approach 1:

The patent applies parameter changes by modifying the genetic parameters of the apple variety through selective breeding and mutation. The new variety 'MAIA-MITCHELL' exhibits changed parameters including earlier onset of red coloration (8 weeks earlier than parent), higher percentage of red coloration (up to 90% vs. 60-70%), and darker color intensity (Strong-red 46A vs. Orange-Red N34A). These parameter changes directly resolve the contradiction by achieving both faster color development and more complete coloration.

Inventive Principle:

Principle #35Parameter changes

2Loss of time

If early harvest is attempted to capture market timing, then harvest time is reduced, but the fruit coloration is insufficient and quality is compromised

Engineering Contradiction:

Improveharvest timingVSAvoidfruit quality consistency

Core Design Contradiction:

Loss of timeVSReliability

Solution Approach 1:

The patent applies preliminary action by enabling the fruit to develop the desired red coloration earlier in the growth cycle. The variety 'MAIA-MITCHELL' initiates and completes red coloration 8 weeks earlier than the parent variety, allowing growers to harvest at optimum maturity with full color development without compromising quality. This preliminary development of coloration resolves the contradiction between early harvest timing and quality consistency.

Inventive Principle:

Principle #10Preliminary action

3Productivity

If the parent variety 'MAIA1' is cultivated, then the tree shows good productivity and vigor, but the fruit coloration is delayed and less complete

Engineering Contradiction:

Improvefruit production volumeVSAvoidfruit coloration quality

Core Design Contradiction:

ProductivityVSManufacturing precision

Solution Approach 1:

The patent applies local quality by enhancing specific local characteristics of the fruit (coloration properties) while maintaining the overall productivity and vigor of the parent variety. The mutation affecting coloration is localized to the fruit skin development, allowing the tree to maintain its productive capacity while the fruit exhibits superior red coloration (up to 90% coverage vs. 60-70%). This resolves the contradiction by improving coloration quality without sacrificing productivity.

Inventive Principle:

Principle #3Local quality

Data Source

PatentUSPP37169P3Apple tree named ‘MAIA-MITCHELL’

Publication Date: 2025.12.23 MIDWEST APPLE IMPROVEMENT ASSOC

AI summary

A new and distinct variety of apple tree named ‘MAIA-MITCHELL’ that ripens in late October with strong, solid red coloration and that maintains firmness and quality for 6 months under commercial refrigeration conditions, is disclosed herein.