Composite Citrus Trees Grafted to Disease-Resistant Rootstocks
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Solution Overview
Problem
Citrus greening disease, also known as Huanglongbing (HLB), significantly impairs orange tree productivity and has no cure, with existing control methods relying on pesticide use that is hampered by difficulties in maintaining and studying diseased plants, and there is a need for trees resistant to both the disease and water with elevated salt content.
Innovation Solution
Composite citrus trees are developed by grafting a fruiting cultivar scion onto a citrus greening disease-resistant rootstock, which can be derived from feral or cultivated trees, including transgenic varieties, to create plants that exhibit resistance to citrus greening disease and elevated salt levels, allowing for reduced or eliminated pesticide use and maintaining commercial viability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If pesticide use is increased to control citrus greening disease, then disease resistance is improved, but the complexity of maintaining and studying diseased plants increases and environmental harm increases
Solution Approach 1:
The patent applies self-service by developing rootstocks that inherently possess resistance to citrus greening disease through their genetic composition. The resistant rootstock system enables the plant to protect itself without requiring external pesticide intervention, thereby simplifying maintenance while maintaining high disease resistance.
Solution Approach 2:
The patent utilizes parameter changes by modifying the genetic parameters of the rootstock through selective breeding and transgenic techniques. By changing the genetic makeup of the rootstock to include resistance alleles, the system achieves disease resistance without increasing operational complexity or environmental harm.
2Reliability
If pesticide dosage is increased to prevent citrus greening, then disease prevention is improved, but environmental harm and cost increase
Solution Approach 1:
The resistant rootstock provides self-service protection against citrus greening disease, eliminating the need for pesticide application. This inherent resistance mechanism prevents disease without generating environmental harm associated with pesticide use.
Solution Approach 2:
The patent converts the harmful effect of disease susceptibility into a benefit by introducing resistance alleles into the rootstock. This transformation turns a vulnerable plant into a resistant one, eliminating the need for harmful pesticide interventions.
3Ease of operation
If conventional orange trees are used, then ease of cultivation is maintained, but productivity is significantly impaired by citrus greening disease
Solution Approach 1:
The patent applies segmentation by separating the fruiting function (scion) from the root function (rootstock). The scion provides the desired fruit characteristics while the rootstock provides disease resistance and environmental adaptability, allowing maintenance of ease of cultivation while preventing productivity impairment.
Solution Approach 2:
The patent uses composite materials in the sense of creating a composite plant system combining scion and rootstock with different functional characteristics. This composite tree structure integrates the ease of cultivation of conventional oranges with the disease resistance of genetically modified rootstocks.
4Adaptability or versatility
If trees resistant to both citrus greening and salt water are developed, then adaptability to harsh environments is improved, but development complexity increases
Solution Approach 1:
The patent applies universality by developing a rootstock system that performs multiple functions: providing disease resistance to citrus greening and tolerance to salt water conditions. This multi-functional rootstock increases adaptability to harsh environments while the modular nature of rootstock development keeps complexity manageable.
Data Source
AI summary
A composite orange tree having a fruiting cultivar scion grafted to a citrus-greening resistant, or a salinity-resistant rootstock, or a rootstock having both citrus-greening and salinity resistance, is described herein, as are methods of growing such a composite orange tree.