Screening Plants for Reduced Wound-Induced Discolouration
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Solution Overview
Problem
The processing of fresh lettuce leads to significant wound-induced discolouration due to enzymatic browning or pinking, which results in rapid deterioration and compromised food safety, necessitating the use of chemical or physical post-harvest treatments that come with costs and safety concerns.
Innovation Solution
A method for screening plants to select those with reduced wound-induced surface discolouration, involving the creation of a wound surface on test plants, incubation to allow discolouration, and comparison with a control plant to identify individuals with reduced discolouration, which can be used to breed plants with enhanced post-harvest quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If chemical or physical post-harvest treatments are applied to inhibit enzymatic browning, then the discolouration is reduced, but food safety issues and regulatory approval requirements arise
Solution Approach 1:
The invention enables plants to protect themselves against enzymatic browning through genetic modification. The transgenic plants produce altered polyphenol oxidase enzymes with reduced browning activity, allowing the plant to inherently resist discolouration without requiring external chemical treatments or post-harvest interventions.
2Object-affected harmful factors
If modified atmosphere packaging with reduced oxygen is used, then enzymatic browning is substantially reduced, but anaerobic respiration creates off-flavour and off-odour
Solution Approach 1:
The transgenic plants inherently possess reduced browning capacity through modified polyphenol oxidase enzymes, eliminating the need for modified atmosphere packaging. The plants self-protect against discolouration while maintaining normal respiratory function and flavour profile under standard packaging conditions.
3Object-affected harmful factors
If heat shock treatment is applied to prevent browning, then enzymatic browning is reduced, but protein biosynthesis is diverted towards heat shock proteins
Solution Approach 1:
The transgenic plants are genetically engineered to produce polyphenol oxidase variants with inherently reduced browning activity, eliminating the need for heat shock treatment. The plants maintain normal protein biosynthesis pathways while achieving the desired reduction in enzymatic browning through the modified enzyme function.
4Object-affected harmful factors
If chemical inhibitors are applied to reduce discolouration, then browning is prevented, but food safety concerns and regulatory approval are required
Solution Approach 1:
The transgenic plants produce modified polyphenol oxidase enzymes that inherently exhibit reduced browning activity, providing self-protection against discolouration without requiring application of external chemical inhibitors. This eliminates food safety concerns and regulatory approval requirements associated with chemical treatments.
5Productivity
If extensive cutting is performed during harvesting and processing, then processing efficiency is improved, but wound-induced discolouration and deterioration increase
Solution Approach 1:
The transgenic plants with modified polyphenol oxidase enzymes provide inherent protection against wound-induced discolouration, allowing extensive cutting and processing to proceed without subsequent deterioration. The plants self-protect against the harmful effects of processing wounds, maintaining quality despite high processing efficiency.
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
This method allows for the identification and breeding of plants with reduced wound-induced discolouration, potentially eliminating the need for chemical or physical post-harvest treatments, thereby improving the quality and safety of processed lettuce while reducing costs.
Implementation Method 1
This wound response leads to a rapid deterioration of the processed product. This deterioration is manifested by discolouration due to enzymatic browning or pinking at and around the wound surface
Data Source
AI summary
Provided is a method for screening a population of plants or plant parts for the presence therein of individuals that show a reduced wound-induced surface discolouration as compared to a control plant or plant part, which method comprises providing a population of plants or parts of the plants from the population; creating a wound surface on the plants or plant parts to be screened and on the control plants or plant parts; incubating the wound surfaces to allow for discolouration to occur therein or thereon; observing the wound surface discolouration in or on the plants or plant parts; comparing the observed wound surface discolouration in or on the plants or plant parts to be screened with the discolouration that is observed on or in the control plant or plant parts. The plants thus selected are also provided.