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Genetic structure of Laodelphax striatellus (Fallén) (Hemiptera: Delphacidae) in Korea : 국내 애멸구의 유전적 구조에 대한 연구

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Authors

BYUNG IN SON

Advisor
Joon-Ho Lee
Major
농업생명과학대학 농생명공학부
Issue Date
2015-08
Publisher
서울대학교 대학원
Keywords
microsatellitepopulation genetic structuredispersalgene flowwing morph
Description
학위논문 (석사)-- 서울대학교 대학원 : 농생명공학부(곤충학전공), 2015. 8. 이준호.
Abstract
The small brown planthopper, Laodelphax striatellus (Fallen), is one of the serious rice pests in Asia, and transmits rice stripe virus (RSV) and rice black-streaked dwarf virus (RBSDV) to rice. Laodelphax striatellus overwinters in Korea and also migrates from China to western parts of Korea. Migration of L. striatellus has been evident since 2009.
The population genetic structure of L. striatellus has not been revealed in Korea. Therefore, I investigated the genetic structure of L. striatellus populations in spatial and temporal scales. Laodelphax striatellus was collected in April and September in 2013 (14 sites) and in April and July in 2014 (16 sites) in Korea. For estimating the population genetic structure of L. striatellus, nine microsatellite loci were used. The average of allelic richness (AR) ranging from 5.5 to 11.129 across populations was the lowest in the April populations in 2014. Pairwise FST values ranged from -0.0048 to 0.0484 among total genotypes. Exact tests showed no significance in all pairwise populations in April in 2013 and July in 2014. Isolation by distance (IBD) was not significant in both 2013 (r2=0.0015, p=0.3) and 2014 (r2=0.0041, p=0.16), indicating high gene flow among L. striatellus populations in Korea. Analysis of molecular variance (AMOVA) showed significantly different genetic variation among years and seasons. In principal coordinate analysis (PCoA), the April population from 2014 was separated from other groups for 21.45% for axis 1 in total genetic variance. STRUCTURE program suggested two genetic cluster, and revealed that a maximum values was 30.04 at ?K=2, in Korea.
In addition, investigation was made to determine the ratio of wing morphs, macropter and brachypter, of L. striatellus. Sampling was taken at sixteen sites in April and July, 2014. Compared to the April population, ratio of brachyterous male in the July population declined significantly, while the brachypterous female ratio increased but it was not significant. A positive relationship was found between the latitude and the ratio of brachypterous adults in April.
In this study, the lack of genetic differentiation and change of proportion of the wing morph indicated the possibility of high dispersal of L. striatellus across the geographic areas in Korea.
Language
English
URI
https://hdl.handle.net/10371/125915
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