Recombinant DNA Constructs for Crop Yield and Stress Tolerance
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Solution Overview
Problem
Current agricultural practices face challenges in enhancing crop yields, nitrogen use efficiency, and water use efficiency, particularly under stress conditions, due to limitations in genetic modification technologies that can effectively introduce desired traits into plants.
Innovation Solution
Development of recombinant DNA constructs that include specific nucleotide and amino acid sequences, linked with promoters functional in plant cells, to modulate gene expression and introduce traits such as increased yield, nitrogen use efficiency, and water use efficiency by suppressing or overexpressing target genes, thereby altering plant phenotypes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional genetic modification methods are used to enhance crop traits, then some genetic changes can be achieved, but the effectiveness is limited and cannot sufficiently improve yield, nitrogen use efficiency, and water use efficiency under stress conditions
Solution Approach 1:
The patent changes the parameters of gene expression by using specific promoters (such as GhWRKY42 promoter) and targeting specific gene sequences (GhNAC2, GhNAC6, GhNAC9) to achieve precise control over gene activity. This approach transforms the generic genetic modification into a targeted parameter-specific modification, thereby improving the reliability and effectiveness of trait enhancement in cotton plants under abiotic stress conditions.
2Productivity
If gene expression is suppressed to introduce desired traits, then traits such as increased yield and stress tolerance can be achieved, but the complexity of constructing recombinant DNA increases
Solution Approach 1:
The patent combines multiple functional elements into a single recombinant DNA construct: the promoter sequence (GhWRKY42), the target gene sequence (GhNAC2/GhNAC6/GhNAC9), and the necessary regulatory elements are merged into one integrated construct. This consolidation simplifies the transformation process and reduces the complexity of managing multiple separate genetic elements while achieving the desired gene suppression effect through RNA interference mechanisms.
3Manufacturing precision
If specific nucleotide sequences are used to target gene suppression, then precision in trait modification is improved, but the difficulty of detecting and measuring the correct sequences increases
Solution Approach 1:
The patent employs a feedback mechanism in the form of specific sequence homology between the promoter region (GhWRKY42) and the target gene regions (GhNAC2, GhNAC6, GhNAC9). This homology acts as a molecular recognition feedback system that ensures the recombinant DNA construct targets the correct sequences with high precision. The feedback through sequence complementarity facilitates both the precise targeting and the detection/verification of correct sequence integration in the transformed plants.
Data Source
AI summary
This disclosure provides recombinant DNA constructs and transgenic plants having enhanced traits such as increased yield, increased nitrogen use efficiency and enhanced drought tolerance; propagules, progeny and field crops of such transgenic plants; and methods of making and using such transgenic plants. This disclosure also provides methods of producing seed from such transgenic plants, growing such seed and selecting progeny plants with enhanced traits. Also disclosed are transgenic plants with altered phenotypes which are useful for screening and selecting transgenic events for the desired enhanced trait.