Sweet Pixie 5 Interspecific Prunus Tree Breeding
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Solution Overview
Problem
Existing interspecific tree varieties lack desirable traits such as vigorous growth, consistent fruit production, and optimal chilling requirements, leading to suboptimal fruit quality and delayed maturity.
Innovation Solution
A new interspecific tree variety, 'Sweet Pixie 5', is developed through crossing Prunus salicina, Prunus avium, and Prunus armeniaca, exhibiting vigorous growth, regular fruit bearing, and improved fruit characteristics like firm flesh and attractive red skin, with a winter chilling requirement of 750 hours, and earlier maturity compared to existing varieties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing intersific tree varieties are used, then they have lower winter chilling requirements, but they exhibit suboptimal fruit quality and delayed maturity
Solution Approach 1:
The patent applies parameter changes by developing a new interspecific tree variety with modified physiological parameters - specifically increasing the winter chilling requirement to 750 hours while simultaneously improving fruit quality attributes (firm flesh, red skin color) and maturity timing. This represents a deliberate change in the temperature parameter threshold to achieve superior fruit characteristics.
2Productivity
If existing intersific tree varieties are used, then they have established fruit production patterns, but they show vigorous growth and regular fruit bearing
Solution Approach 1:
The patent employs composite materials principle by creating an intersific tree variety that combines genetic traits from multiple Prunus species (Prunus salicina, Prunus avium, and Prunus armeniaca). This genetic composite results in a tree that simultaneously exhibits both vigorous growth strength and consistent regular fruit bearing productivity, resolving the contradiction between these two desirable traits.
3Reliability
If new variety 'Sweet Pixie 5' is developed with higher chilling requirement, then fruit quality improves, but cultivation requirements become more stringent
Solution Approach 1:
The patent applies local quality principle by making the variety adaptation location-specific - the enhanced fruit quality characteristics (firm flesh, red skin, good flavor) are optimized for regions that can provide the required 750 hours of winter chilling. This creates a quality-focused cultivation strategy where the variety excels in specific climatic zones rather than attempting universal adaptability.
Data Source
AI summary
A new and distinct variety of interspecific tree (Interspecific Prunus species). The following features of the tree and its fruit are characterized with the tree budded on ‘Nemaguard’ Rootstock (non-patented), grown on Handford sandy loam soil with Storie Index rating 95, in USDA Hardiness Zone 9, near Modesto, Calif., with standard commercial fruit growing practices, such as pruning, thinning, spraying, irrigation and fertilization. Its novelty consist of the following combination of desirable features:1. Tree having a vigorous, upright growth habit.2. Tree being a regular and productive bearer of medium size fruit.3. Fruit with very good flavor and eating quality.4. Fruit with an attractive red skin color.5. Fruit with a high degree of soluble solids (Brix) of 23.1°.