Pearl Raspberry Cultivar Low Chilling Floricane Production
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Solution Overview
Problem
Current floricane fruiting raspberry cultivars require high winter chilling, limiting their suitability for early cropping in subtropical and warm temperate regions, and often produce fruit on both primocanes and floricanes, which complicates production and shipping.
Innovation Solution
The 'Pearl' cultivar of Rubus idaeus L. is developed, characterized by its low chilling requirement of 250 hours for bud break and almost exclusive floricane fruiting, producing large, firm, and attractive fruit, primarily in the spring, with minimal primocane fruiting, making it suitable for early season production in warmer areas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If floricane fruiting raspberry cultivars are used for early cropping, then fruit production in spring is achieved, but high winter chilling requirement limits suitability for subtropical and warm temperate regions
Solution Approach 1:
The patent changes the chilling requirement parameter from high (conventional floricane cultivars) to low (250 hours), enabling the cultivar to adapt to subtropical and warm temperate regions while maintaining early spring fruit production capability
2Duration of action of moving object
If floricane cultivars produce fruit on both primocanes and floricanes, then extended cropping season is achieved, but production and shipping complexity increases
Solution Approach 1:
The patent extracts the primocane fruiting function from the raspberry cultivar, resulting in a floricane-type cultivar that produces fruit exclusively on floricanes. This simplification eliminates the complexity of managing two different fruiting systems while maintaining spring cropping
Data Source
AI summary
The present invention is a new and distinct floricane fruiting red raspberry cultivar named ‘Pearl’, which is capable of producing large quantities of commercial size and quality fruit in subtropical or warm temperate areas which experience little winter chilling. The cultivar is characterized by high bud break and vigorous flower truss growth from floricanes on low chilled plants which bear fruit early in the season. ‘Pearl’ fruit is light colored, truncated conic, firm, easily seen and picked and uniform; making it suitable for commercial shipping. The plant has a tendency toward trifoliolate (vs. pentafoliolate) leaves, dark red, somewhat innocuous thorns, and relatively smooth and simple leaf margins.