Recombinant DNA Constructs for Stable Trait Stacking in Transgenic Plants
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Solution Overview
Problem
Current methods for enhancing plant traits such as water use efficiency, cold tolerance, and yield are limited in their ability to provide stable and consistent improvements across different environmental stress conditions, and often require multiple transgenic events to achieve desired agronomic traits.
Innovation Solution
Development of recombinant DNA constructs comprising specific polynucleotides and their cognate amino acid sequences, which are stably integrated into plant cells and expressed to confer enhanced traits like herbicide tolerance, drought resistance, and improved nitrogen use efficiency, using Agrobacterium-mediated transformation or microprojectile bombardment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple transgenic events are used to achieve desired agronomic traits, then the variety of enhanced traits increases, but the stability and consistency of trait expression decreases
Solution Approach 1:
The patent combines multiple trait-enhancing transgenic events into a single integrated event, where multiple genes are co-introduced and co-expressed in one transformation event. This merging approach ensures that all desired traits are stably integrated together in the same genome, eliminating the inconsistency that arises from multiple separate events while maintaining the variety of enhanced traits.
Solution Approach 2:
The patent creates composite transgenic constructs that integrate multiple functional elements (promoters, coding sequences, terminators) from different sources into a unified genetic architecture. This composite structure allows multiple traits to be expressed in a coordinated and stable manner, resolving the contradiction between trait diversity and expression consistency.
2Reliability
If recombinant DNA constructs are stably integrated into plant chromosomes, then trait enhancement is achieved, but the complexity of the transformation process increases
Solution Approach 1:
The patent employs Agrobacterium tumefaciens as an intermediary vector system to facilitate stable chromosomal integration of recombinant DNA. The bacterium naturally transfers DNA to plant cells through its Ti plasmid mechanism, serving as a biological mediator that simplifies the transformation process while ensuring stable integration, thereby reducing overall process complexity despite achieving reliable trait expression.
3Object-affected harmful factors
If specific polynucleotides are used to enhance plant traits under stress conditions, then drought resistance and cold tolerance are improved, but the applicability across different environmental conditions is limited
Solution Approach 1:
The patent designs recombinant DNA constructs with universal promoters and regulatory elements that can drive expression of stress-responsive genes under multiple environmental stress conditions. By using constitutive or inducible promoters that respond to various stress signals (drought, cold, heat, salinity), the same transgenic construct can provide protection across different environmental conditions, enhancing versatility while maintaining specific stress resistance.
Data Source
AI summary
Transgenic seed for crops with enhanced agronomic traits are provided by trait-improving recombinant DNA in the nucleus of cells of the seed where plants grown from such transgenic seed exhibit one or more enhanced traits as compared to a control plant. Of particular interest are transgenic plants that have increased yield. The present invention also provides recombinant DNA molecules for expression of a protein, and recombinant DNA molecules for suppression of a protein.