Maize Salt Tolerance via Marker-Assisted Selection
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Solution Overview
Problem
Current methods for addressing salt stress and drought in maize crops are not economically sustainable or effective, and breeding for salt tolerance is complex due to the trait's nature.
Innovation Solution
Identification and selection of maize plants with specific QTL alleles or recombinant DNA constructs encoding antiporter/sodium ion transporter genes to enhance tolerance to salt and drought stress, using methods such as marker-assisted selection and gene shuffling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional breeding methods are used to develop salt tolerant maize varieties, then salt tolerance may be improved, but the breeding process becomes complex and time-consuming due to the complex nature of salt tolerance as a trait
Solution Approach 1:
The patent replaces conventional mechanical breeding methods with molecular marker-assisted selection. Instead of relying on phenotypic observation and traditional crossing methods, the invention uses DNA markers (such as SSR, SNP, or RFLP markers) to directly identify and select plants carrying desired salt tolerance alleles, thereby simplifying the breeding process while improving reliability
Solution Approach 2:
The patent introduces molecular markers as intermediaries between the salt tolerance trait and the selection process. These markers serve as proxies that indicate the presence of salt tolerance genes without requiring direct phenotypic assessment, enabling indirect but more efficient selection of tolerant plants
2Reliability
If exogenous chemical compounds are applied to ameliorate salt stress effects, then plant tolerance is improved, but economic sustainability deteriorates due to ongoing input costs
Solution Approach 1:
The patent enables plants to self-regulate salt stress tolerance through endogenous genetic mechanisms. By selecting and propagating plants with favorable alleles at specific QTLs (such as qs.nphs1 for sodium accumulation and qt.nphs1 for osmotic adjustment), the plants inherently possess the capacity to tolerate salt stress without requiring external chemical inputs, thereby achieving long-term economic sustainability
3Reliability
If transgenic approaches are used to produce salt tolerant plants, then tolerance is improved, but device complexity and regulatory hurdles increase
Solution Approach 1:
Instead of introducing foreign transgenes to confer salt tolerance, the patent inverts the approach by selecting and propagating native maize alleles that naturally confer salt tolerance. This uses conventional breeding combined with molecular marker assistance to utilize endogenous genetic variation, avoiding the complexities of transgenic regulation and public perception while achieving similar physiological outcomes
Data Source
AI summary
Compositions and methods useful in identifying and counter-selecting maize plants with having enhanced yield-related traits relative to control plants under abiotic stress conditions such as salt stress and/or drought are provided herein. The methods use molecular genetic markers to identify, select and/or construct salt stress tolerant and/or drought tolerant maize plants. Also provided are methods to enhance tolerance to salt stress and/or drought in crop plants by transforming crop plants with the Zea mays antiporter/sodium ion transporter or by introducing favorable allelic variants of the Zea mays antiporter/sodium ion transporter gene via gene editing.