Triploid Hybrid Lime Breeding for HLB Tolerance and Seedlessness
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Solution Overview
Problem
Existing citrus cultivars face challenges in HLB tolerance, fruit size, seedlessness, and flavor profile, particularly in hybrid lime cultivars, which need further development for commercial viability and resistance to diseases.
Innovation Solution
Development of a new hybrid lime cultivar 'C4-5-14', a triploid hybrid of Citrus limon, Citrus aurantifolia, and Fortunella japonica, exhibiting improved HLB tolerance, nearly seedless fruit, smaller size, and a stronger lime flavor, suitable for dooryard and fresh fruit markets.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing citrus cultivars are used, then they have established fruit size and flavor profiles, but they exhibit poor HLB tolerance and high seed content
Solution Approach 1:
The patent applies hybridization to create a composite citrus genotype combining multiple parental lines (P1, P2, P3) with complementary traits. The F1 hybrid cultivar integrates HLB tolerance from resistant parents with improved fruit characteristics, creating a composite genetic material that simultaneously addresses disease resistance and fruit quality requirements.
2Reliability
If hybridization is used to improve HLB tolerance, then disease resistance improves, but fruit size and consistency become variable
Solution Approach 1:
The patent employs precise control of breeding parameters including selective parental line choice, controlled pollination timing, and systematic evaluation of F1 hybrids. By adjusting genetic parameters through controlled hybridization and selecting specific F1 individuals with optimal trait combinations, the patent achieves consistent fruit size while maintaining HLB tolerance.
3Quantity of substance
If triploid hybridization is employed to achieve seedlessness, then seed content decreases, but fruit size may be reduced
Solution Approach 1:
The patent creates triploid hybrids that exhibit local quality differentiation: the fruit flesh (endocarp) remains seedless or nearly seedless while the overall fruit size is maintained through controlled hybridization. The triploid condition specifically affects seed development in the locular space while leaving other fruit quality parameters intact, achieving seedlessness without proportionally reducing fruit volume.
4Reliability
If new hybrid cultivars are developed, then HLB tolerance and fruit quality improve, but breeding complexity and time increase
Solution Approach 1:
The patent implements preliminary action by pre-selecting parental lines with known HLB tolerance and complementary fruit traits before hybridization. The breeding program establishes predetermined crossing schemes and uses preliminary evaluation of parental performance to guide F1 selection, reducing overall program complexity and time requirements compared to unguided breeding approaches.
Data Source
AI summary
A new and distinct cultivar of hybrid lime (Citrus sp.) plant named ‘C4-5-14’, characterized by near-seedlessness, high productivity, HLB tolerance, consistent aroma, juiciness, and multiple blooms throughout the year. The new cultivar ‘C4-5-14’ is suitable for the fresh fruit industry and for dooryard trees. The new cultivar ‘C4-5-14’ is a triploid hybrid from an interploid cross of alletetraploid somatic hybrid [‘Santa Teresa’ lemon+‘Lakeland’ limequat] x diploid ‘Cook Eureka’ lemon.