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Pollen contamination in seed mixture increases the dominance of resistance to Bt maize in Spodoptera frugiperda (Lepidoptera: Noctuidae).
- Source :
-
Pest management science [Pest Manag Sci] 2017 Nov; Vol. 73 (11), pp. 2379-2385. Date of Electronic Publication: 2017 Aug 23. - Publication Year :
- 2017
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Abstract
- Background: Seed mixture, also called 'RIB', has been used to provide refuge populations for delaying insect resistance. Pollen contamination in RIB could result in refuge kernels of non-Bt maize expressing variable Bt proteins. Data are lacking regarding the impact of pollen contamination on evolution of resistance for ear-feeding insects. Here, we used Spodoptera frugiperda and Cry1F-maize as a model to examine if pollen contamination in RIB increases the dominance of insect resistance.<br />Results: Pollen contamination caused >66% refuge kernels in 5:95% (non-Bt:Bt) and 20:80% RIBs to express Cry1F protein. Survival at adult stage on pure non-Bt ears was similar (54.4-63.3%) among Cry1F-susceptible (SS), Cry1F-resistant (RR) and Cry1F-heterozygous (RS) S. frugiperda. On Bt ears, survival was similar between SS and RS (0.0-1.7%), but it was significantly less than that of RR (59.2%). On the two RIB refuge ears, survival at adult stage for RS (42.3% in 5:95% RIB; 50.0% in 20:80% RIB) was significantly higher than for SS (8.7% in 5:95% RIB; 10.0% in 20:80% RIB).<br />Conclusion: The results suggest that pollen contamination in RIB could increase the dominance of resistance for ear-feeding insects by significantly reducing susceptible refuge populations and supporting higher survival of heterozygotes relative to homozygous susceptible insects. © 2017 Society of Chemical Industry.<br /> (© 2017 Society of Chemical Industry.)
- Subjects :
- Animals
Bacillus thuringiensis genetics
Bacillus thuringiensis Toxins
Larva drug effects
Larva growth & development
Plants, Genetically Modified genetics
Plants, Genetically Modified physiology
Seeds
Spodoptera growth & development
Zea mays genetics
Bacterial Proteins pharmacology
Endotoxins pharmacology
Hemolysin Proteins pharmacology
Insecticide Resistance
Pollen chemistry
Spodoptera drug effects
Zea mays physiology
Subjects
Details
- Language :
- English
- ISSN :
- 1526-4998
- Volume :
- 73
- Issue :
- 11
- Database :
- MEDLINE
- Journal :
- Pest management science
- Publication Type :
- Academic Journal
- Accession number :
- 28580723
- Full Text :
- https://doi.org/10.1002/ps.4631