PLUMRED XIII Plum Tree Early Ripening and Pollination Management
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Solution Overview
Problem
There is a need for a new plum tree variety that is self-unfruitful, producing firm, sweet, and dark red fruit that ripens earlier than existing varieties, with improved pollination characteristics and adaptability to central California's climate and market demands for fresh and shipping-quality plums.
Innovation Solution
The development of the 'PLUMRED XIII' plum tree variety, which is self-unfruitful and requires cross-pollination, produces medium to large, dark red, clingstone fruit that is very sweet and firm, with enhanced bee pollination and heat tolerance, utilizing 'Plumsweet IV' as the seed parent and compatible with 'Nemaguard' rootstock, resulting in fruit that is 45 days earlier in ripening than its parent and larger in size with less freckling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the plum variety produces dark red fruit with fine freckling and early ripening, then the fruit quality and market value are improved, but the pollination difficulty increases due to self-unfruitfulness
Solution Approach 1:
The patent introduces compatible pollen parent varieties as intermediaries to enable cross-pollination. The self-unfruitful 'PLUMRED XIII' requires pollen from compatible varieties to set fruit, transforming the pollination challenge into a managed cross-pollination system with selected parent varieties that ensure fruit production while maintaining the desired dark red color and fine freckling quality characteristics.
2Loss of time
If the fruit ripens 45 days earlier than the seed parent, then the market timing advantage is improved, but the genetic stability and breeding complexity increase
Solution Approach 1:
The patent achieves early ripening by changing the genetic parameters through hybridization between 'Plumsweet IV' and an unknown plum pollen parent. The resulting 'PLUMRED XIII' exhibits a 45-day earlier ripening period compared to its seed parent, demonstrating parameter change in the ripening time characteristic while maintaining genetic stability through true-to-type asexual reproduction.
3Productivity
If the fruit is produced on medium-sized vigorous trees, then the productivity is improved, but the tree management and pruning requirements increase
Solution Approach 1:
The patent describes trees with medium size and vigorous growth that require dormant pruning to maintain productivity. The dynamic nature of the tree growth allows for surplus top-growth during spring and summer, which is then managed through dormant pruning to maintain the desired medium tree size while ensuring consistent fruit production and vigor.
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 medium size, vigorous, hardy, and productive tree. Being self-unfruitful, the present variety requires cross pollination from an apricot, interspecific, or plum that blooms during the mid season, such as ‘Plumred III’ interspecific tree (U.S. Plant Pat. No. 20,864). The present variety produces a heavy amount of flowers that produce an abundance of pollen to entice good bee activity to facilitate pollination. The fruit matures under the ecological conditions described during early to mid July, with first picking on Jul. 10, 2020. The fruit is medium to large in size, dark red with fine freckling throughout in skin appearance, entirely dark red in flesh color, clingstone in type, globose to oblate in shape, firm in texture, juicy, very sweet, and excellent in flavor.