Bt Research 2025, Vol.16, No.3, 103-109 http://microbescipublisher.com/index.php/bt 107 5.4 Lessons learned This case demonstrates that Bt genetically modified crops have significant advantages in enhancing field stability and durability. However, it is also emphasized that the resistance management strategy must be scientific and reasonable. Rational planning of shelters, optimization of field layout, and monitoring of changes in pest populations are all key to ensuring the long-term stability of Bt crops and delaying the development of resistance. Field management also needs to take into account both yield and ecological security, and continuously improve technologies and measures in order to achieve the sustainable application of Bt bioengineering (Shelton et al., 2000). 6 Future Directions 6.1 Integration with CRISPR-based editing for precision engineering. In the future, Bt bioengineering can be combined with gene editing technologies such as CRISPR to more precisely modify Bt toxin genes. CRISPR can control the domain and expression level of Bt proteins, as well as their distribution time and location in crops. These modifications can make Bt proteins more stable in the environment, more specific to target insects, and also assist in resistance management. In this way, it is expected to obtain more efficient, lower-risk and more adaptable Bt crops and microorganisms, bringing new methods for pest control and ecological security. 6.2 Combination with other biocontrol strategies (RNAi, beneficial microbes). The future development direction of Bt bioengineering also includes integration with other prevention and control methods, such as RNA interference (RNAi) and beneficial microorganisms. RNAi can specifically target the important genes of pests. If used in combination with Bt protein, it can expand the range of pest control and also slow down the development of pest resistance. The combined use of beneficial microorganisms (such as probiotics and antagonistic fungi) and Bt can not only enhance the stress resistance of crops, but also improve the soil microecology, thereby forming a multi-level and sustainable biological control system (Shelton et al., 2018). This "multi-pronged" approach can reduce the reliance on a single Bt protein, enhance the overall control effect, and is also more conducive to ecological security. 6.3 Climate-resilient Bt strains tailored for different ecosystems. Climate change has brought great challenges to agricultural ecology. In the future, Bt bioengineering will require the development of "climate-resilient" Bt strains that can adapt to different climates and environments. For instance, through molecular breeding and screening, Bt strains and crop varieties that are heat-tolerant, drought-tolerant or salt-tolerant can be obtained to adapt to different agricultural environments around the world (Shelton et al., 2018). At the same time, appropriate Bt protein combinations and expression methods can also be designed based on the main pests and environmental pressures in different regions, which can further enhance the stability and sustainability in the field. 7 Concluding Remarks In recent years, significant progress has been made in the stability research of Bt (Bacillus thuringiensis). Researchers encapsulated Bt proteins and spores with microcapsules, nanomaterials and biomolecules to make them more stable in the environment, especially performing better in terms of UV protection and extending field effects. For instance, wrapping Bt with lignosulfonate or chitosan can effectively protect its activity, keep it stable even under strong light, and enhance the field application effect. While enhancing the pest control effect, safety has always been the focus of Bt projects. The new generation of Bt preparations can be released more precisely, have stronger targeting, and have less impact on non-target organisms and ecosystems. Biopolymer coating not only enhances stability as it is easy to degrade and has low toxicity, but also reduces environmental risks. These improvements have laid the foundation for the long-term application of Bt, achieving a balance between protection effectiveness and environmental safety.
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