Pest Management Science (2015) 71, 1433-1440

Bo Li, Yangyang Xu, Cao Han, Lanzhi Han, Maolin Hou and Yufa Peng (2015)
Chilo suppressalis and Sesamia inferens display different susceptibility responses to Cry1A insecticidal proteins
Pest Management Science 71 (10), 1433-1440
Abstract:
BACKGROUND
Chilo suppressalis and Sesamia inferens are important lepidopteran rice pests that occur concurrently in rice-growing areas of China. The development of transgenic rice expressing Cry1A insecticidal proteins has provided a useful strategy for controlling these pests.
RESULTS
This study evaluated the baseline susceptibilities of C. suppressalis and S. inferens to Cry1A, as well as their responses to selection with Cry1A. Wide geographic variation in susceptibility was observed across all field populations. Within a given population, the LC₅₀ of both Cry1Ab and Cry1Ac against S. inferens was drastically higher than that of C. suppressalis. Large LC₅₀ differences (74.6-fold) were detected between the two species for Cry1Ab in the Poyang population, while small differences (3.6-fold) were detected for Cry1Ac in the Changsha population. The Cry1Ac LC₅₀ of C. suppressalis and S. inferens increased 8.4- and 4.4-fold after 21 and eight selection generations respectively. Additionally, the estimated realised heritabilities (h²) of Cry1Ac tolerance were 0.11 in C. suppressalis and 0.292 in S. inferens.
CONCLUSIONS
S. inferens exhibited a significantly lower susceptibility and more rapidly evolved resistance to Cry1A compared with C. suppressalis. Therefore, S. inferens is more likely to evolve increased resistance, which threatens the sustainability of rice expressing Cry1A protein.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
Link to article at publishers website
Database assignments for author(s): Mao-Lin Hou

Research topic(s) for pests/diseases/weeds:
biocontrol - natural enemies
Research topic(s) for beneficials or antagonists:
resistance/tolerance/defence of host

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Chilo suppressalis
	Sesamia inferens
Bacillus thuringiensis Cry1A-toxin (entomopathogen)	Chilo suppressalis
Bacillus thuringiensis Cry1A-toxin (entomopathogen)	Sesamia inferens