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Optimized scorpion polypeptide LMX: a pest control protein effective against rice leaf folder
Xiuzi Tianpei1, Yingguo Zhu1, Shaoqing Li1
1State Key Laboratory of Hybrid Rice; Key Laboratory for Research and Utilization of Heterosis in Indica Rice of Ministry of Agriculture; Engineering Research Center for Plant Biotechology and Germplasm Utilization of Ministry of Education; College of Life Sciences, Wuhan University, Wuhan, China.
A novel insecticidal peptide, LMX, derived from scorpion neurotoxin, effectively controls rice leaf folder pests. This peptide enhances crop protection by disrupting larval development and reducing feeding damage.
Area of Science:
- Agricultural Entomology
- Molecular Biology
- Biochemistry
Background:
- Lepidopteran pests cause substantial crop yield losses globally.
- Insect-specific scorpion peptides offer potential for targeted pest control.
- The neurotoxin LqhIT2 shows insecticidal properties but requires optimization.
Purpose of the Study:
- To investigate the efficacy of an optimized scorpion neurotoxin peptide, LMX, against the rice leaf folder.
- To elucidate the biochemical mechanisms underlying LMX's insecticidal activity.
- To evaluate the potential of LMX as a biopesticide for rice protection.
Main Methods:
- In vitro and in planta assays to assess LMX activity against rice leaf folder larvae.
- Biochemical analysis of larval physiological systems (ecdysone, detoxification, digestion, antioxidant enzymes) following LMX ingestion.
- Development and evaluation of transgenic rice expressing the LMX peptide.
Main Results:
- LMX demonstrated high insecticidal activity, reducing feeding, growth, development, and increasing mortality in rice leaf folder larvae.
- LMX exhibited improved stability and efficacy compared to the parent LqhIT2 toxin.
- LMX ingestion significantly altered larval ecdysone levels and key enzyme activities in detoxification, digestive, and antioxidant systems.
- Transgenic rice lines expressing LMX showed significantly reduced leaf damage.
Conclusions:
- The optimized scorpion neurotoxin peptide LMX is a potent and effective agent against the rice leaf folder.
- LMX acts by disrupting crucial physiological processes in the insect larvae.
- LMX represents a promising, specific, and effective alternative for protecting rice crops from lepidopteran pests.
