Genetic and environmental factors reducing the incidence of the storage pestSitotroga cerealellain maize
| Autor: | Pedro Revilla, M. C. Romay, Ana Butrón, Amando Ordás, Rosa Ana Malvar |
|---|---|
| Rok vydání: | 2008 |
| Předmět: |
Resistance
Biology medicine.disease_cause Angoumois grain moth Genotypic covariates Lepidoptera genitalia Toxicology Sitotroga cerealella Infestation Environmental covariates medicine Poaceae Stored products Genetic variability Ecology Evolution Behavior and Systematics Genetically modified maize business.industry food and beverages Gelechiidae biology.organism_classification Biotechnology Lepidoptera medicine.drug_formulation_ingredient Insect Science PEST analysis business |
| Zdroj: | Digital.CSIC. Repositorio Institucional del CSIC instname |
| ISSN: | 1570-7458 0013-8703 |
| DOI: | 10.1111/j.1570-7458.2008.00733.x |
| Popis: | The Angoumois grain moth, Sitotroga cerealella (Olivier) (Lepidoptera: Gelechiidae), is found worldwide and infests maize grains in the field and during storage. Transgenic maize resistant to kernel attack by S. cerealella has been developed, but could pose a nutritional risk to humans and livestock. Therefore, alternative sources of resistance posing no threat to consumption should be identified. In this study, our main objectives were to assess genetic variability for kernel damage by S. cerealella under natural infestation and to determine genetic and environmental factors contributing to genotype, year, and genotype*year variability. Factorial regression was performed to obtain a biological explanation for the number of kernels damaged per ear. Seventy-seven Spanish maize landraces along with six hybrid checks were evaluated in 2004, 2005, and 2006. There was variability for kernel damage by natural infestation of S. cerealella among the landraces: popcorn landraces were among the least damaged, whereas hybrid checks were among the most susceptible genotypes. Plant characteristics associated with ear appearance could be the main stimulatory factors for oviposition and feeding of S. cerealella moths, followed by husk coverage of the ear. It was confirmed that temperature is the main environmental factor affecting S. cerealella development. Genotypes sensitive to infestation by S. cerealella were more negatively affected by higher temperatures than the least attractive genotypes, and lower temperatures reduced the number of kernels damaged on the most susceptible genotypes more than on the least susceptible. Research was supported by project RF03-007-C31 and the Excma. Diputación Provincial de Pontevedra. M.C. Romay acknowledges a fellowship from the Ministry of Education and Science of Spain. MEC Diputación Provincial de Pontevedra |
| Databáze: | OpenAIRE |
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