Dwarf Spineless Raspberry Cultivar NR7 for Ornamental Use
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Solution Overview
Problem
Existing red raspberry cultivars often exhibit tall growth habits and spiny canes, making them difficult to manage and harvest, and lack desirable fruit characteristics such as medium-sized, firm, and light-red fruit that are easy to pick.
Innovation Solution
The development of the 'NR7' red raspberry variety, which features a dwarf growth habit, completely spineless canes, and produces medium-sized, firm, light-red, ovate-round fruit that are easy to pick, resulting from a controlled breeding program combining HR101 and 'Willamette' parents.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If traditional red raspberry cultivars are used, then they produce fruit, but they exhibit tall growth habits and spiny canes making them difficult to manage and harvest
Solution Approach 1:
The patent applies parameter changes by selecting and breeding plants with altered growth parameters - specifically choosing seedlings that exhibited dwarf growth habits (canes less than 0.8m in height) from the cross between HR101 and 'Willamette'. This natural variation in cane height parameter was selected and propagated to create the dwarf cultivar NR7, directly resolving the contradiction between tall growth and ease of management.
Solution Approach 2:
The patent extracts the undesirable spiny characteristic from the raspberry cultivar through selective breeding. The dwarf parent HR101 contributed the spineless trait, and this desirable property was extracted and fixed in the new cultivar NR7, eliminating the harmful spiny canes while maintaining fruit production capability.
2Ease of operation
If traditional red raspberry cultivars are used, then they produce fruit, but the fruit lacks desirable characteristics such as medium-sized, firm, and light-red color that are easy to pick
Solution Approach 1:
The patent employs feedback through systematic evaluation and selection of fruit characteristics across multiple growing seasons (2001-2008). The breeder continuously assessed fruit size, firmness, color, and pickability of seedlings, using this feedback information to select the superior individual that became NR7. This iterative feedback process ensured the fruit met the desired specifications of medium size, firmness, light-red color, and ease of picking.
Solution Approach 2:
The patent changes multiple fruit parameters simultaneously through selective breeding - selecting for medium fruit size, firm texture, light-red coloration, and optimal ripening timing. The dwarf parent HR101 contributed favorable genetic factors for these fruit quality parameters, which were combined with the pollinizer 'Willamette' to produce the consistent fruit characteristics seen in cultivar NR7.
3Ease of operation
If a dwarf growth habit is selected, then ease of management improves, but this trait is very unusual in red raspberry and may affect other plant characteristics
Solution Approach 1:
The patent allows the dwarf growth habit to serve multiple functions simultaneously - the shortened canes provide ease of management and harvest while also contributing to the overall plant architecture that supports fruit production. The dwarf parent HR101's genetic contribution created a self-sufficient plant type where the dwarfing trait integrates with other plant characteristics rather than conflicting with them.
Solution Approach 2:
The patent changes the fundamental growth parameter of cane height while maintaining adaptability through careful selection. The dwarf cultivar NR7 was evaluated across multiple seasons and locations (2001-2008 in Lynden, Washington) to confirm its adaptability, demonstrating that the altered growth parameter does not compromise the plant's ability to thrive in appropriate growing conditions.
Data Source
AI summary
A new and distinct floricane fruiting red raspberry, Rubus idaeus L., variety is described. The variety results from selection among a population of seedlings derived from the controlled pollination crossing of the raspberry varieties known as HR101 (not patented) and ‘Willamette’ (not patented). The new variety is distinguished from others by the dwarfing nature of the plant which tends to produce many canes that do not grow more than approximately 600 mm in height. The plant is not suited to commercial fruit production but is very suited to ornamental uses such as in the home garden and containers where it produces attractive foliage and edible raspberry fruit comparable in size to those of taller growing varieties.