Spinach Resistance Introgression Without Linked Lethal Factor
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Solution Overview
Problem
Spinach plants are susceptible to multiple pathogens, including Peronospora farinosa, Stemphylium vesicarium, and Cucumber Mosaic Virus (CMV), leading to significant yield loss and quality reduction, particularly in organic farming, where chemical treatments are not viable.
Innovation Solution
Introduction of genomic fragments from Spinacia tetrandra into Spinacia oleracea, specifically located on chromosomes 3 and 4, providing resistance to Peronospora farinosa, Stemphylium vesicarium, and CMV, utilizing nucleotide sequences such as SEQ ID Nos. 1-43, introduced through methods like introgression, PCR amplification, and vector expression.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional resistance methods are used to protect spinach against Peronospora farinosa, then resistance to the pathogen is achieved, but a lethal factor is introduced that reduces plant viability
Solution Approach 1:
The patent extracts only the beneficial resistance gene from the Spinacia tetrandra genome while leaving behind the lethal factor. This is achieved by using molecular markers to identify and select plants that have the resistance gene without the linked lethal factor, effectively separating the desirable trait from the harmful one.
Solution Approach 2:
The patent changes the genetic parameters by introducing a genomic fragment from a wild relative (Spinacia tetrandra) that provides resistance to Peronospora farinosa. This introgression modifies the genetic composition of cultivated spinach to include disease resistance while managing the associated lethal factor through marker-assisted selection.
2Productivity
If chemical fungicides are used to control pathogens, then yield loss is prevented, but environmental concerns increase and sustainability is reduced
Solution Approach 1:
The patent enables spinach plants to protect themselves against pathogens through genetically introduced resistance. The plants produce their own defense mechanisms against Peronospora farinosa, Stemphylium vesicarium, and Cucumber Mosaic Virus, eliminating the need for external chemical interventions and reducing environmental impact.
3Adaptability or versatility
If multiple resistance genes are introduced to provide broad-spectrum resistance, then protection against multiple pathogens is achieved, but genetic complexity increases
Solution Approach 1:
The patent combines multiple resistance traits into a single genomic fragment from Spinacia tetrandra. This genomic fragment provides simultaneous resistance to Peronospora farinosa, Stemphylium vesicarium, and Cucumber Mosaic Virus, consolidating multiple protective functions into one integrated genetic element rather than introducing separate genes for each pathogen.
Data Source
AI summary
Provided herein are spinach plants resistant to Peronospora farinosa and Stemphylium vesicarium, and spinach plants additionally resistant to Cucumber Mosaic Virus (CMV). Also provided herein are genomic fragments providing the present resistances and use thereof for identifying spinach resistant to Peronospora farinosa and Stemphylium vesicarium, and spinach plants additionally resistant to Cucumber Mosaic Virus (CMV). Provided herein are a spinach plant resistant to Peronospora farinosa and Stemphylium vesicarium: including a genomic fragment of Spinacia tetrandra located on chromosome 4 between positions 8255074 and 8620598 of the spinach reference genome, the genomic fragment of Spinacia tetrandra lacking a lethal factor and providing Peronospora farinosa resistance and including a genomic fragment located on chromosome 3 and between positions 1177586 and 1271037 of the spinach reference genome providing Stemphylium vesicarium resistance.