Stevia Plant Screening via Genetic Marker Segmentation
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Solution Overview
Problem
There is a need for a stevia plant with high steviol glycoside content.
Innovation Solution
A method of screening for high steviol glycoside-content stevia plants by detecting specific genetic features using techniques like dCAPS or TaqMan PCR, and a screening kit for detecting these genetic features.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If conventional screening methods (detecting only genetic feature 2) are used, then stevia plants with moderate steviol glycoside content can be identified, but plants with high steviol glycoside content cannot be reliably obtained
Solution Approach 1:
The screening method is segmented into two independent detection steps: first detecting genetic feature (1) at position 290 of SEQ ID NO: 1, then detecting genetic feature (2) at position 40 of SEQ ID NO: 2. This segmentation allows each genetic marker to be evaluated separately, enabling the identification of plants that possess both features for maximum steviol glycoside content.
Solution Approach 2:
The invention performs preliminary genetic detection at the DNA level before actual steviol glycoside content measurement. By detecting the presence of specific alleles (T at position 290 and A at position 40) in advance, the method predicts high steviol glycoside content potential, allowing early selection of superior plants without waiting for phenotypic expression.
2Quantity of substance
If traditional breeding and selection methods are used, then stevia plants can be developed over time, but the process is time-consuming and inefficient
Solution Approach 1:
The invention replaces traditional mechanical breeding methods (crossing, phenotypic selection, multi-generation breeding) with molecular detection methods (dCAPS, TaqMan PCR). This substitution enables direct identification of desired genetic traits at the DNA level, eliminating the need for time-consuming breeding cycles and phenotypic observation periods.
Solution Approach 2:
Instead of physically breeding plants to transfer traits, the invention uses genetic markers as copies or indicators of the desired steviol glycoside production capability. By detecting specific allele patterns that copy the information of high steviol glycoside potential, the method identifies superior plants immediately without requiring actual breeding operations.
3Quantity of substance
If only genetic feature (2) is detected, then some steviol glycoside enrichment can be achieved, but maximum enrichment (3% or more) cannot be realized
Solution Approach 1:
The invention merges two genetic detection systems into a unified screening protocol. By combining the detection of genetic feature (1) from SEQ ID NO: 1 and genetic feature (2) from SEQ ID NO: 2 into a single integrated method, the invention achieves synergistic effects that produce 3% or more steviol glycoside enrichment, exceeding what either marker could achieve alone.
Solution Approach 2:
The screening method is designed with universal applicability by establishing a standardized two-step detection protocol that can be implemented using common molecular biology techniques (dCAPS, TaqMan PCR). This universal approach allows the same methodology to be applied across different stevia plant populations and breeding programs, maximizing its utility despite the added detection step.
Data Source
AI summary
A method of screening for a stevia plant with high steviol glycoside content, that includes detecting from the genome of a test stevia plant the presence and/or the absence of the following genetic feature: (1) homozygous for the allele wherein the base at the position corresponding to position 290 of SEQ ID NO: 1 is T, and the presence and/or the absence of the following genetic feature: (2) homozygous or heterozygous for the allele wherein the base at the position corresponding to position 40 of SEQ ID NO: 2 is A.