Apple Tree MN55 Breeding for Early Ripening and Storage Life
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Solution Overview
Problem
There is a need for an apple tree cultivar that combines early ripening, crisp and juicy fruit, long storage life, and vigorous growth habit, while maintaining fruit quality and resistance to diseases like apple scab.
Innovation Solution
The development of the Malus domestica 'MN55' cultivar, which results from crossing 'Honeycrisp' and AA-44, exhibits early ripening, globose-conical fruit with 75-95% red skin, firmness of 14-19 lbs, and a storage life of 150-180 days, along with a vigorous spreading to upright plant habit, differing from its parents in ripening time and skin color.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If early ripening is achieved, then harvest time is reduced, but storage life is typically shortened
Solution Approach 1:
The patent applies parameter changes by selectively breeding for specific genetic traits that alter the physiological parameters of fruit maturation and storage. The 'MN55' cultivar was developed through controlled crossing and selection to achieve a specific combination of ripening speed and storage duration parameters that do not normally co-occur in apple varieties.
2Productivity
If vigorous growth habit is achieved, then productivity increases, but disease resistance may be reduced
Solution Approach 1:
The patent applies local quality by selecting for specific localized traits in different parts of the plant. The 'MN55' cultivar exhibits vigorous growth in above-ground foliage while maintaining disease resistance through selective breeding for genetic traits that specifically enhance resistance to apple scab and other diseases without compromising overall growth vigor.
3Ease of manufacture
If red skin color is increased, then market appeal improves, but susceptibility to sunburn may increase
Solution Approach 1:
The patent applies parameter changes by controlling the concentration and distribution of anthocyanin pigments in the fruit skin. The 'MN55' cultivar was bred to achieve optimal red coloration parameters that maximize market appeal while maintaining sufficient skin thickness and pigment distribution patterns that protect against sunburn damage.
Data Source
AI summary
A new cultivar of apple tree, ‘MN55’, that is characterized by its fruit that is early ripening, its fruit that are globose-conical in shape and medium to large in size, its fruit with a texture that is very crisp and juicy, which is maintained during storage, its fruit with a long storage life, its fruit skin that is 75 to 95% red in color over a yellow-green background color, its firmness of 14 to 19 lbs. at harvest, its spreading to upright plant habit, and its vigorous growth habit.