Tomato Breeding Using Marker-Assisted Selection for Sympodial Index
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Solution Overview
Problem
Current tomato breeding methods struggle to produce S. lycopersicum plants with a sympodial index of 2 (spi^2) efficiently, as the spi trait is difficult to select due to its variability and linkage with fruit color, making it challenging to develop commercial varieties with both high yield and desired fruit color.
Innovation Solution
The use of marker-assisted selection with markers linked to the SP3D gene and the phytoene synthase gene allows for the production of S. lycopersicum plants with a sympodial index between 1.6 and 2.4, enabling the uncoupling of spi and fruit color traits, thereby producing red-fruited plants with increased yield and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If traditional backcrossing methods are used to produce S. lycopersicum plants with spi^2, then the sympodial index can be reduced, but the selection process becomes difficult and time-consuming due to trait variability and linkage with fruit color
Solution Approach 1:
The patent replaces traditional phenotypic selection methods with marker-assisted selection (MAS). Molecular markers linked to the SP3D gene and phytoene synthase gene are used to identify plants with the desired spi^2 trait and red fruit color genotype, eliminating the need for time-consuming phenotypic observation and manual leaf removal practices.
Solution Approach 2:
The patent introduces molecular markers as intermediaries to detect the presence of desired traits. These markers serve as proxies for the actual traits (spi^2 and red fruit color), allowing breeders to select for the traits indirectly through marker detection rather than direct phenotypic measurement.
2Measurement precision
If marker-assisted selection is implemented, then the precision of trait selection is improved, but the complexity of the breeding process increases
Solution Approach 1:
The patent replaces complex manual phenotypic assessment with simplified molecular marker detection. The SP3D gene markers and phytoene synthase gene markers provide direct genetic evidence of the desired traits, eliminating the need for complex phenotypic measurements and subjective assessments.
3Ease of operation
If the spi trait is selected based on phenotypic characteristics, then the selection process is simple, but the linkage with yellow fruit color prevents obtaining red-fruited plants with spi^2
Solution Approach 1:
The patent uses molecular markers as intermediaries to detect the spi^2 genotype independently of fruit color phenotype. The SP3D gene markers allow detection of the sympodial index trait genetically, while phytoene synthase gene markers detect red fruit color potential, enabling selection for both traits simultaneously without phenotypic linkage interference.
Solution Approach 2:
The patent changes the selection parameter from phenotypic observation to genotypic detection. By using molecular markers to detect the presence of specific alleles at the SP3D and phytoene synthase loci, the selection process operates at the genetic level where traits are independent, rather than at the phenotypic level where they appear linked.
Data Source
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AI summary
The present invention provides a method for the production of S. lycopersicum plants having an average sympodial index of 2 and producing red-colored fruits comprising crossing a plant of S. lycopersicum capable of producing red-colored fruits, with a plant of a Solanum spp. having an average sympodial index of 2, collecting the seeds resulting from the cross, regenerating the seeds into plants, providing one or more backcross generations, selfing the backross plants, growing the selfed seed into plants, and identifying and selecting plants having an average sympodial index of 2 and producing red-colored fruits.