Ruby Transcription Factor Citrus Anthocyanin Production
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Solution Overview
Problem
Blood oranges lack reliability in anthocyanin production due to environmental dependency, leading to unstable global market supply, as their color development is heavily dependent on specific thermal conditions, resulting in weak or absent pigmentation in non-optimal climates.
Innovation Solution
Introduction of a polynucleotide construct encoding the Ruby R2R3 Myb transcription factor into citrus plants to regulate anthocyanin biosynthesis, allowing for stable and increased anthocyanin production in citrus fruits, independent of cold temperatures, through the use of homologous recombination methods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If blood orange varieties are cultivated in non-optimal climates without cold temperatures, then cultivation can expand to more regions, but anthocyanin pigmentation becomes weak or absent
Solution Approach 1:
The patent modifies the genetic parameters of blood orange plants by introducing and overexpressing the Ruby transcription factor gene. This genetic parameter change enables the plants to produce anthocyanins reliably without depending on environmental temperature parameters, thus resolving the contradiction between cultivation adaptability and pigmentation reliability
Solution Approach 2:
The Ruby transcription factor gene enables the plant to self-regulate anthocyanin production internally through genetic mechanisms rather than relying on external environmental conditions. The plant serves itself by having constitutive expression of Ruby that automatically triggers anthocyanin biosynthesis pathways regardless of climate conditions
2Reliability
If blood oranges are cultivated in optimal climates with cold temperatures, then anthocyanin pigmentation is intense and reliable, but the geographic range for cultivation is limited
Solution Approach 1:
The patent extracts the environmental dependency (cold temperature requirement) from the anthocyanin production process by introducing the Ruby transcription factor gene. This genetic modification removes the need for specific climatic conditions, allowing blood oranges to be cultivated reliably in diverse geographic locations without requiring cold temperatures
Solution Approach 2:
The Ruby transcription factor gene provides universal anthocyanin production capability across different environmental conditions. The genetically modified blood orange plants can function reliably in both traditional optimal climates and new non-optimal regions, achieving multi-environment adaptability while maintaining pigmentation reliability
3Quantity of substance
If post-harvest cold storage is used to enhance pigmentation, then anthocyanin levels increase, but post-harvest losses increase and costs rise
Solution Approach 1:
The patent applies preliminary action by ensuring anthocyanin pigmentation is established during fruit development and ripening through constitutive Ruby expression, rather than relying on post-harvest cold storage to induce pigmentation. The fruits are pre-pigmented before harvest, eliminating the need for expensive and loss-inducing post-harvest cold treatment
Solution Approach 2:
The patent converts the previously harmful effect of cold storage (which causes post-harvest losses) into a beneficial genetic trait. By engineering constitutive Ruby expression, the plants naturally produce anthocyanins without requiring cold stress, thus eliminating the harmful side effects of cold storage while maintaining high pigmentation levels
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The method enables citrus plants to produce fruits with higher anthocyanin levels, ensuring a stable supply of blood oranges and expanding their cultivation to regions without optimal cold conditions, enhancing their nutritional value and market reliability.
Implementation Method 1
Introduction of a polynucleotide construct encoding the Ruby R2R3 Myb transcription factor into citrus plants to regulate anthocyanin biosynthesis
Data Source
AI summary
Methods are provided for making a citrus plant that is capable of producing fruit with increased levels of anthocyanins in the fruit when compared to a citrus fruit from a wild-type or control plant. Such methods involve increasing the expression of Ruby, an R2R3 Myb transcription factor, in a citrus plant, particularly in the fruit of a citrus plant. Further provided are citrus plants, citrus fruit, and citrus plant cells made by such methods, nucleic acid molecules and expression cassettes comprising nucleotide sequences that encode Ruby, and the Ruby proteins encoded thereby.