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Development of a bioassay method to test activity of cry insecticidal proteins against Diatraea spp. (Lepidoptera: Crambidae) sugarcane stem borers

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Title Development of a bioassay method to test activity of cry insecticidal proteins against Diatraea spp. (Lepidoptera: Crambidae) sugarcane stem borers
 
Creator Ángel-Salazar, Juan Sebastián
Echeverri-Rubiano, Claudia
Rodriguez-Chalarca, Jairo
López-Gerena, Jershon
dos Santos, Rafael Ferreira
Jurat-Fuentes, Juan Luis
Revynthi, Alexandra M.
Vargas, Germán
 
Subject proteins
plant pests
stem eating insects
diatraea
sugar cane
insecticidal properties
analytical methods
 
Description The genus Diatraea (Lepidoptera: Crambidae) includes stem borers representing the most critical sugarcane pests in the Americas. Colombia's most widely distributed and damaging Diatraea species include Diatraea saccharalis, D. indigenella, D. busckella, and D. tabernella. The reduced efficacy of biological tools commonly used in controlling several species highlights the importance of evaluating alternative management strategies, such as transgenic plants expressing insecticidal proteins from the bacterium Bacillus thuringiensis (Bt). The selection of optimal Bt insecticidal proteins for Diatraea control depends on bioassays with purified Bt proteins. Because there is no described artificial diet for borer species other than D. saccharalis and availability of most purified Bt toxins is restricted, this study aimed at developing a bioassay method using fresh corn tissue and providing proof of concept by testing susceptibility to the Cry1Ac insecticidal protein from Bt. Toxicity was evaluated with a single Cry1Ac dose applied directly to corn discs. Stem borer mortality after seven days was higher than 90% for all four tested Diatraea species, while control mortality was below 8%. In addition, we observed that Cry1Ac caused more than 90% weight inhibition in all survivors and delayed development. These results validate the use of this method to determine mortality and growth inhibition due to the consumption of the Cry1Ac protein in each of the Diatraea species. Furthermore, this method could be used to assess other entomopathogenic substances to control these insect pests.
 
Date 2023-10-18
2023-11-13T11:16:41Z
2023-11-13T11:16:41Z
 
Type Journal Article
 
Identifier Ángel-Salazar, J.S.; Echeverri-Rubiano, C.; Rodriguez-Chalarca, J.; López-Gerena, J.; dos Santos, R.F.; Jurat-Fuentes, J.L.; Revynthi, A.M.; Vargas, G. (2023) Development of a bioassay method to test activity of cry insecticidal proteins against Diatraea spp. (Lepidoptera: Crambidae) sugarcane stem borers. PLoS ONE 18(10): e0292992. ISSN: 1932-6203
1932-6203
https://hdl.handle.net/10568/134464
https://doi.org/10.1371/journal.pone.0292992
 
Language en
 
Rights CC-BY-4.0
Open Access
 
Format e0292992
application/pdf
 
Publisher Public Library of Science
 
Source PLoS ONE