Recombinant DNA Constructs for Abiotic Stress Tolerance in Plants
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current methods for improving drought and nitrogen stress tolerance in plants are limited by the complexity of genetic regulation and the inefficiency of molecular marker-assisted breeding, with transgenic approaches facing challenges in achieving significant and sustainable enhancements in crop yields under stress conditions.
Innovation Solution
The development of recombinant DNA constructs that include polynucleotides with specific nucleotide or amino acid sequences, operably linked to regulatory sequences, which are introduced into plant cells to enhance nitrogen use efficiency, drought tolerance, and cold tolerance, using over-expression techniques to confer improved stress tolerance traits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If molecular marker-assisted breeding is used to improve drought tolerance, then breeding efficiency is improved, but marker accuracy and breeding efficiency remain problematic
Solution Approach 1:
The patent uses molecular markers as intermediaries to detect and select for drought tolerance genes. Specific DNA sequences (e.g., SNPs, SSRs) serve as mediators that indirectly indicate the presence of desirable stress tolerance traits, enabling breeders to select plants with improved drought tolerance without directly measuring the complex physiological responses to stress
Solution Approach 2:
The patent replaces traditional mechanical/phenotypic selection methods (observing plant behavior under stress conditions) with molecular-level detection methods. Instead of physically testing plants under drought conditions to assess tolerance, the invention uses DNA-based markers to predict tolerance at the molecular level, substituting a simpler biochemical assay for complex environmental testing
2Reliability
If transgenic approaches are used to engineer drought tolerance, then drought tolerance is improved, but achieving significant and sustainable enhancements in crop yields under stress conditions remains challenging
Solution Approach 1:
The patent segments the complex trait of drought tolerance into multiple independent genetic components or QTLs (quantitative trait loci). Instead of attempting to transfer a single gene responsible for complete drought tolerance, the invention identifies and utilizes multiple genetic regions that collectively contribute to stress tolerance, allowing for cumulative improvement of the trait through sequential breeding steps
Solution Approach 2:
The patent develops molecular markers that can detect multiple stress tolerance genes simultaneously or that are applicable across different plant species. The marker systems described can identify genes conferring tolerance to various abiotic stresses (drought, salinity, cold), providing a universal toolset that serves multiple breeding objectives rather than being limited to a single stress condition
3Productivity
If nitrogen fertilizer is increased to improve plant growth and yield, then nitrogen assimilation capacity is improved, but pollution by nitrates increases and profit margin decreases
Solution Approach 1:
The patent enables plants to self-regulate their nitrogen uptake and assimilation efficiency through genetically improved traits. Plants with enhanced nitrogen use efficiency (NUE) can acquire and utilize nitrogen more effectively from limited sources, reducing their dependence on external fertilizer applications while maintaining high growth rates and yields, thereby eliminating the need for excessive nitrogen input that causes pollution
Data Source
AI summary
Isolated polynucleotides and polypeptides, and recombinant DNA constructs useful for conferring improved nitrogen use efficiency and/or drought tolerance and/or cold tolerance; compositions (such as plants or seeds) comprising these recombinant DNA constructs; and methods utilizing these recombinant DNA constructs are disclosed. The recombinant DNA constructs comprise a polynucleotide operably linked to a promoter that is functional in a plant, wherein said polynucleotides encode low nitrogen tolerance polypeptides.