Plumcandy XIII Plum Tree Cross-Pollination and Fruit Quality
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Solution Overview
Problem
There is a need for a new plum tree variety that is self-unfruitful, requiring cross-pollination, with plums that are sweet, firm, and freestone, differing from existing varieties in flesh color, size, and ripening time, while being adaptable to central California's climate and suitable for commercial orchards.
Innovation Solution
The development of the 'Plumcandy XIII' plum tree variety, which is self-unfruitful, produces large, yellow-fleshed, freestone plums that are sweet and firm, requiring cross-pollination, and is compatible with 'Nemaguard' rootstock, exhibiting heat and drought tolerance, and suitable for commercial production.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the plum variety is made self-unfruitful to ensure cross-pollination, then pollination reliability improves, but the complexity of orchard management increases due to the need for multiple pollinator varieties
Solution Approach 1:
The orchard is segmented into different functional zones with specific pollinator varieties planted in designated areas. The 'Plumcandy XIII' variety is separated from its pollinators ('Yummyrosa' or 'Plumregal') by about 100 feet, creating distinct but interconnected pollination zones that ensure cross-pollination while maintaining manageable orchard structure
Solution Approach 2:
Bees serve as intermediary agents that transfer pollen between the self-unfruitful 'Plumcandy XIII' variety and the pollinator varieties. The bees naturally navigate between the separated tree groups, facilitating cross-pollination without requiring direct contact between incompatible varieties
2Volume of moving object
If the plum variety produces larger fruit, then market value improves, but the tree's productivity per unit time decreases
Solution Approach 1:
The variety produces uniformly medium to large-sized fruit (2-3 inches in diameter) that is slightly larger than many commercial varieties. This partial increase in size achieves better market value without the excessive reduction in total yield that would result from producing only very large fruit, balancing quality and quantity
Solution Approach 2:
The fruit size parameter is optimized to a specific range (2-3 inches diameter, 2-3 ounces weight) that provides sufficient market appeal while maintaining reasonable productivity. The uniformity of this size parameter across the crop enhances both marketability and packing efficiency
3Duration of action of stationary object
If the plum variety has extended hanging time on the tree, then shipping capability improves, but the risk of fruit quality degradation increases
Solution Approach 1:
The fruit develops natural protective characteristics before harvest, including a firm texture and thick skin that cushion against degradation during extended hanging. The fruit's physiological properties are pre-conditioned to resist softening and quality loss, providing a buffer against the risks of prolonged tree retention
Solution Approach 2:
The variety is designed with a specific harvest window (mid to late October) where fruit quality is optimal. While the fruit can hang for extended periods, the commercial strategy is to harvest within this optimal window rather than allow indefinite hanging, treating the extended hanging capability as a backup option rather than the primary strategy
4Adaptability or versatility
If the plum variety requires cross-pollination, then genetic diversity improves, but the ease of orchard establishment decreases due to planting requirements
Solution Approach 1:
The orchard planting plan segments varieties into pollinator groups and production groups, with pollinator varieties ('Yummyrosa' or 'Plumregal') planted in specific locations about 100 feet from the 'Plumcandy XIII' production trees. This segmented arrangement ensures genetic diversity through cross-pollination while maintaining a relatively simple establishment process by using standardized planting patterns
Solution Approach 2:
The pollinator varieties serve multiple functions: they provide the necessary pollen for cross-pollination, produce their own marketable fruit, and act as buffer zones between production blocks. This multi-functionality reduces the overall complexity of orchard establishment by combining pollination infrastructure with productive orchard elements
Data Source
AI summary
The present invention relates to a plum tree, Prunus salicina, and more particularly to a new and distinct variety broadly characterized by a large size, vigorous, hardy, and somewhat irregularly productive tree. Being self-unfruitful, the present variety requires cross pollination from another plum that blooms during the mid season, such as ‘Yummyrosa’ plum (U.S. Plant Pat. No. 13,476). The fruit matures under the ecological conditions described in mid to late October, with first picking on Oct. 16, 2015, and has the ability to hang firm on the tree for another three weeks. The fruit is uniformly medium in size, full red in skin color, freestone in type, purely yellow in flesh color, very firm in texture, juicy, typically 22 to 24 brix, and excellent in flavor.