Anthocyanin-Free Broccoli Through MYB2 and DFR1 Inactivation
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Solution Overview
Problem
The accumulation of anthocyanins in broccoli, particularly under cold conditions, reduces the commercial value of the crop, and the mechanisms underlying anthocyanin accumulation in different tissues and cultivars of Brassica oleracea are not well understood.
Innovation Solution
Development of anthocyanin-free broccoli plants through a combination of inactive MYB2 and DFR1 genes, preferably homozygous, achieved by genetic modification or mutation, such as CRISPR-Cas editing, to prevent anthocyanin production.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If broccoli is grown under cold conditions, then anthocyanin production increases, but commercial value decreases due to purple discoloration
Solution Approach 1:
The patent removes the harmful anthocyanin production pathway from broccoli by inactivating the DFR1 gene, which is responsible for anthocyanin synthesis. This extraction of the problematic metabolic pathway allows the plant to maintain cold tolerance while preventing purple discoloration, thus resolving the contradiction between adaptability and harmful effects.
Solution Approach 2:
The patent changes the functional state of the DFR1 gene from active to inactive through genetic modification. By altering the gene's expression status, the plant metabolism is changed to prevent anthocyanin accumulation while maintaining normal growth and cold response mechanisms, thereby eliminating purple discoloration without sacrificing cold tolerance.
2Reliability
If anthocyanin biosynthesis is allowed to proceed, then plant protection functions are maintained, but commercial value is reduced
Solution Approach 1:
The patent selectively removes only the anthocyanin synthesis function by inactivating the DFR1 gene, while leaving other protective metabolic pathways intact. This precise extraction allows the plant to maintain essential protection functions through alternative mechanisms while eliminating the harmful purple pigmentation that reduces commercial value.
3Object-affected harmful factors
If DFR1 gene is inactivated alone, then anthocyanin production is reduced, but purple discoloration still occurs under certain conditions
Solution Approach 1:
The patent combines the inactivation of two genes (MYB2 and DFR1) that work together in the anthocyanin biosynthesis pathway. MYB2 is a transcription factor that regulates anthocyanin gene expression, while DFR1 is an enzyme in the synthesis pathway. By inactivating both genes, the patent creates a redundant block that ensures complete prevention of anthocyanin accumulation and purple discoloration under all conditions, enhancing the reliability of the solution.
Data Source
AI summary
Provided herein is an anthocyanin-free broccoli plant including a combination of an inactive MYB2 gene and an inactive DFR1 gene. The present invention further relates to methods for providing the present anthocyanin-free broccoli plants. The present invention also relates to seeds and plant parts of the present anthocyanin-free broccoli plants.