Ecological Genetics and Host Range Expansion by Busseola fusca (Lepidoptera: Noctuidae).

Assefa, Y; Conlong, D E; Van Den Berg, J; Martin, L A

Assefa, Y; Conlong, D E; Van Den Berg, J; Martin, L A.

Afiliación

Assefa Y; Department of Zoology and Entomology, University of Fort Hare, Faculty of Science and Agriculture, Private Bag X1314, Alice 5700, South Africa. yarmide@ufh.ac.za.
Conlong DE; South African Sugarcane Research Institute, Private Bag X02, Mount Edgecombe, 4300, South Africa. School of Life Sciences, University of KwaZulu-Natal, Private Bag X01, Pietermaritzburg, Scottsville 3209, South Africa.
Van Den Berg J; Unit of Environmental Sciences and Development, North-West University, Potchefstroom 2520, South Africa.
Martin LA; South African Sugarcane Research Institute, Private Bag X02, Mount Edgecombe, 4300, South Africa.

Environ Entomol ; 44(4): 1265-74, 2015 Aug.

Article en En | MEDLINE | ID: mdl-26314073

RESUMEN

The host plant range of pests can have important consequences for its evolution, and plays a critical role in the emergence and spread of a new pest outbreak. This study addresses the ecological genetics of the indigenous African maize stem borer, Busseola fusca (Fuller) (Lepidoptera: Noctuidae), in an attempt to investigate the evolutionary forces that may be involved in the recent host range expansion and establishment of this species in Ethiopian and southern African sugarcane. We used populations from Ethiopia, Zimbabwe, and South Africa to examine whether the host range expansion patterns shared by the Ethiopian and the southern African populations of B. fusca have evolved independently. Base-pair differences in the cytochrome oxidase I (COI) gene were used to characterize haplotype diversity and phylogenetic relationships. There were seven haplotypes among the 30 sequenced individuals collected on four host plant species from 17 localities in the four countries. Of the seven COI haplotypes identified, the two major ones occurred in both sugarcane and maize. Genetic analyses revealed no detectable genetic differentiation between southern African B. fusca populations from maize and sugarcane (FST = 0.019; P = 0.24). However, there was strong evidence of variation in genetic composition between populations of the pest from different geographic regions (FST = 0.948; P < 0.001). The main implication of these findings is that the B. fusca populations in maize in southern Africa are more likely to shift to sugarcane, suggesting that ecological opportunity is an important factor in host plant range expansion by a pest.

Asunto(s)

Evolución Biológica; Variación Genética; Herbivoria; Mariposas Nocturnas/fisiología; Animales; Complejo IV de Transporte de Electrones/genética; Complejo IV de Transporte de Electrones/metabolismo; Etiopía; Haplotipos; Proteínas de Insectos/genética; Proteínas de Insectos/metabolismo; Datos de Secuencia Molecular; Mariposas Nocturnas/genética; Filogenia; Análisis de Secuencia de ADN; Sudáfrica; Especificidad de la Especie; Zimbabwe

Palabras clave

Busseola fusca; ecological genetics; host range expansion; sugarcane

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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Variación Genética / Evolución Biológica / Herbivoria / Mariposas Nocturnas Tipo de estudio: Prognostic_studies Límite: Animals País/Región como asunto: Africa Idioma: En Revista: Environ Entomol Año: 2015 Tipo del documento: Article País de afiliación: Sudáfrica Pais de publicación: Reino Unido

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