Reuben Blackberry Primocane Breeding for Yield and Fruit Size
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Solution Overview
Problem
There is a need for a new blackberry variety that exhibits a primocane fruiting habit, large fruit size, high quality, and high productivity, which are not adequately met by existing blackberry varieties.
Innovation Solution
The development of the 'Reuben' blackberry variety, a hybrid of Rubus subgenus Eubatus sect. Moriferi & Ursini, which is characterized by its primocane fruiting habit, large fruit size, high quality, and high productivity, achieved through a hand-pollinated cross between 'A-2292T' and 'APF-44', and stabilized through asexual reproduction via root cuttings and in-vitro propagation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If existing blackberry varieties are used, then cultivation is straightforward, but fruit size is small and productivity is limited
Solution Approach 1:
The patent applies parameter changes by breeding a new variety with fundamentally different fruiting habits (primocane vs floricane), altered fruit size parameters (14.5g vs 6.0-9.4g), and changed thorn characteristics. These parameter changes resolve the contradiction by creating a variety that simultaneously achieves larger fruit size and higher productivity through its unique biological characteristics
2Productivity
If existing blackberry varieties are used, then cultivation is simple, but fruit quality is insufficient
Solution Approach 1:
The patent resolves this contradiction through parameter changes in the fruit characteristics, achieving soluble solids of 11.5% and very firm texture while maintaining high productivity. The primocane fruiting habit and larger fruit size (14.5g average weight) contribute to superior quality metrics without sacrificing yield
3Ease of operation
If existing blackberry varieties are used, then thornless varieties are available, but they lack large fruit size and high productivity
Solution Approach 1:
The patent applies parameter changes by introducing thorns back into the variety (35 thorns per 30cm at base) while simultaneously achieving higher productivity (3.5kg per plant) and larger fruit size. This resolves the contradiction by demonstrating that thorns do not necessarily reduce productivity when combined with other improved characteristics
4Productivity
If existing blackberry varieties are used, then variety is available, but primocane fruiting habit is not achieved
Solution Approach 1:
The patent resolves this contradiction through a fundamental parameter change in the fruiting habit from floricane (existing varieties) to primocane. This biological parameter change enables the plant to fruit on first-year canes, extending the harvest season and increasing overall productivity while maintaining adaptability to cultivation systems
Data Source
AI summary
This invention relates to a new and distinct variety of blackberry plant named ‘Reuben’, which is primarily characterized by its primocane fruiting habit, large fruit size, high quality, and high productivity, is disclosed.