Maize SNP Screening to Shorten HPPD-Inhibitor Resistance Breeding
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Solution Overview
Problem
The challenge is to develop maize plants resistant to HPPD inhibitor herbicides, as sensitivity to these herbicides can lead to severe phytotoxic effects and yield loss, and conventional breeding methods are time-consuming and inefficient.
Innovation Solution
Identification and utilization of novel SNP markers linked to HPPD inhibitor resistance, allowing for rapid selection and breeding of resistant maize plants through marker-assisted selection, reducing the need for herbicide phenotyping and shortening the breeding process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional breeding methods are used to develop HPPD inhibitor-resistant maize plants, then resistance can be achieved, but the breeding process is time-consuming and inefficient
Solution Approach 1:
The invention applies preliminary action by identifying and utilizing SNP markers that are already associated with HPPD inhibitor resistance in maize. These markers serve as early indicators allowing breeders to select resistant plants at the seedling stage through DNA analysis, rather than waiting for phenotypic expression after herbicide application. This preliminary genetic screening dramatically reduces breeding time while maintaining reliable selection for resistance.
2Measurement precision
If herbicide phenotyping is used to identify resistant maize plants, then resistance can be confirmed, but the process requires multiple generations and extensive field testing
Solution Approach 1:
The invention replaces the mechanical/physical system of herbicide phenotyping (spraying plants and observing effects) with a molecular/biochemical system based on SNP marker detection. By using DNA-based markers associated with resistance, the invention eliminates the need for time-consuming field phenotyping across multiple generations, thereby dramatically improving breeding efficiency while maintaining accurate identification of resistant plants.
3Reliability
If maize plants are sprayed with HPPD inhibitors for selection, then resistant plants can be identified, but susceptible plants suffer severe phytotoxic effects and yield loss
Solution Approach 1:
The invention introduces an intermediary system - SNP marker analysis - that mediates between the goal of identifying resistant plants and the harmful effects of herbicide application. Instead of directly exposing plants to HPPD inhibitors for selection, the intermediary molecular marker test allows indirect identification of resistant genotypes through DNA analysis, completely avoiding phytotoxic effects on susceptible plants while maintaining accurate selection reliability.
Data Source
AI summary
The current invention relates to methods and compositions to select herbicide-resistant maize plants, by using molecular markers. It more specifically relates to novel single nucleotide polymorphism markers linked with 4-hydroxyphenylpyruvate dioxygenase inhibitor resistance in maize plants, and methods for identifying and selecting 4-hydroxyphenylpyruvate dioxygenase inhibitor resistant maize plants using these markers.