Cry1Da and Cry1Be Protein Combination for Insect Resistance Management
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Solution Overview
Problem
The development of resistance in insect populations to single insecticidal proteins used in transgenic plants poses a challenge for maintaining the effectiveness of Bt-based insect resistance traits, leading to potential losses in crop yield and increased pesticide use.
Innovation Solution
The use of a combination of Cry1Da and Cry1Be proteins in transgenic plants, which do not compete for binding sites in fall armyworm gut cells, delaying or preventing resistance development and providing multiple sites of action against target pests, thereby reducing the need for refuge acreage and minimizing cross-resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single Bt protein is used in transgenic plants, then the insecticidal effect is strong initially, but resistance develops quickly in pest populations
Solution Approach 1:
The patent combines multiple Bt proteins (Cry1Da and Cry1Be) into a single transgenic plant variety, creating a pyramided stack that delivers multiple insecticidal mechanisms simultaneously. This merging approach ensures that pests must develop resistance to multiple different proteins to overcome control, significantly extending the duration of effective insecticidal action while maintaining strong initial efficacy.
Solution Approach 2:
The invention creates a composite insecticidal system by integrating different Bt protein genes into the plant genome. The composite nature of expressing multiple distinct Cry proteins with different modes of action provides both immediate strong insecticidal effect and long-term sustainability by preventing rapid resistance development, as pests cannot easily adapt to multiple different toxic mechanisms simultaneously.
2Duration of action of moving object
If multiple Bt proteins are combined to delay resistance, then the longevity of insecticidal efficacy is extended, but the complexity of the transgenic system increases
Solution Approach 1:
Multiple Bt protein expression systems are merged into a single transgenic plant variety through coordinated transformation. This integration allows the plant to simultaneously produce multiple Cry proteins from different genes, achieving extended resistance management without requiring separate application of multiple products or complex field management systems.
Solution Approach 2:
The transgenic plant system achieves multi-functionality by incorporating genes for multiple Bt proteins that target different insect pests and different resistance mechanisms. This universal approach provides broad-spectrum insect control and simultaneous resistance management across multiple pest species, reducing the need for separate single-protein varieties for different pests.
3Productivity
If refuge acreage is reduced to minimize non-Bt crop areas, then the productivity and economic return increase, but the effectiveness of resistance management decreases
Solution Approach 1:
The patent implements preliminary resistance management by pre-configuring the plant with multiple Bt protein mechanisms before pest resistance develops. This proactive approach embeds multiple lines of defense directly in the crop, eliminating the need for reactive refuge strategies and allowing near-universal planting of the transgenic variety while maintaining resistance management effectiveness.
Solution Approach 2:
The pyramided Bt protein stack provides continuous insecticidal pressure across multiple mechanisms simultaneously, ensuring that resistant individuals are continuously selected against throughout the growing season. This continuous multi-mechanism action replaces the discontinuous protection that would result from refuge-based strategies, maintaining both high productivity and resistance management effectiveness.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This combination effectively protects crops from fall armyworm damage by delaying resistance development and offering multiple sites of action, enhancing the longevity of insecticidal efficacy and reducing the requirement for refuge areas.
Implementation Method 1
The key predictor of lack of cross resistance inherent in this approach is that the insecticidal proteins do not compete for receptors in a sensitive insect species.
Data Source
Figure 1~2
AI summary
The subject invention includes methods and plants for controlling fall army worm insects, said plants comprising a Cry1Da insecticidal protein and a Cry1Be insecticidal protein, and various combinations of other proteins comprising this pair of proteins, to delay or prevent development of resistance by the insects.