Allozyme polymorphism and geographic variation in the small brown planthopper, Laodelphax striatellus (Homoptera: Delphacidae)

The small brown planthopper, Laodelphax striatellus, immigrates annually into Japan over the East China Sea from the Asian mainland. It is not known whether this long-distance dispersal has any effect on the genetic structure of Japanese L. striatellus populations. The dispersal of L. striatellus is...

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Bibliographic Details
Published in:Biochemical genetics 1997-12, Vol.35 (11/12), p.383-393
Main Author: Hoshizaki, S
Format: Article
Language:English
Subjects:
ALLELES
ALLOENZYMES
ALLOZYME
ALLOZYMES
ALOZIMAS
Animal populations
Animals
Climate
Cytoplasmic incompatibility
Delphacidae
Differentiation
Dispersal
ENZYME POLYMORPHISM
Enzymes
Epidemics
GENE
GENE FREQUENCY
GENES
Genetic structure
GEOGRAPHICAL VARIATION
Geographical variations
Geography
Homoptera
Infection
Insecta - enzymology
Insecta - genetics
Insecta - microbiology
Islands
Isoelectric Focusing
Isoenzymes
JAPAN
JAPON
Laodelphax striatellus
Life history
Oryza sativa
POLIMORFISMO ENZIMATICO
Polymorphism, Genetic
POLYMORPHISME ENZYMATIQUE
Population dynamics
Population structure
Rickettsiaceae Infections
TAIWAN
Wolbachia
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Summary:The small brown planthopper, Laodelphax striatellus, immigrates annually into Japan over the East China Sea from the Asian mainland. It is not known whether this long-distance dispersal has any effect on the genetic structure of Japanese L. striatellus populations. The dispersal of L. striatellus is suspected to be relevant to the population dynamics of infection with the parasitic bacterium Wolbachia, which causes cytoplasmic incompatibility in L. striatellus. Wolbachia infection has spread within and among Japanese L. striatellus populations due to this cytoplasmic incompatibility. In the present study, the geographic differences among II L. striatellus populations from Japan and Taiwan was investigated using allozyme polymorphism. FST values on three enzyme loci (GPI, PGM, and AK) indicated a geographically differentiated population structure. Significant differentiation was found even among populations located along the course of the long-distance dispersal. The results indicated that long-range dispersal of L. striatellus does not occur regularly over the main islands of Japan and that it does not have a large effect on the population structure of L. striatellus. This conclusion is in agreement with the geographically variable life history of L. striatellus adapted to local climates. The short-term rice stripe epidemic, which is vectored by L. striatellus, in northwestern Kyushu, Japan, during 1985 and 1986 corresponds to these results. Based on the present findings, short-distance dispersal was considered to drive the spatial spread of Wolbachia infection among L. striatellus populations.
ISSN:0006-2928
1573-4927
DOI:10.1023/A:1022233700872