Genetic Variation of the Beet Armyworm, Spodoptera exigua (Hubner), Populations in Korea Using Polymorphic Allozymes

다형 동위효소를 이용한 국내 파밤나방(Spodoptera exigua (Hubner)) 집단의 유전변이

  • 강성영 (안동대학교 자연과학대학 생명자원과학부) ;
  • 김용균 (안동대학교 자연과학대학 생명자원과학부)
  • Published : 2001.09.01

Abstract

Genetic variation of the beet armyworm, Spodoptera exigua (Hubner), was analyzed by polymorphic allozymes. Field populations were subdivided by different hosts, geographical locations, and seasons. Estimated average heterozygosity ($0.443\pm$0.013) indicated high genetic variation in all field populations of S. exigua. There were significant inbreeding effects deviated from Hardy-Weinberg equilibrium in each of subpopulations. These significant nonrandom matings were caused by within-subpopulations probably due to sampling errors, but not by mating isolation among subpopulations. Wrights ($F_{ST}$ ) and Neis (D) genetic distances indicated little genetic differentiation among subpopulations, though some southern local subpopulations (Haenam and Sachon) were relatively different of northern subpopulations (Andong and Kunwi). Estimated number of migrants per generation was 5.9 among host subpopulations, 10.6 among geographical subpopulations, and 31.8 among seasonal subpopulations. These genetic analyses suggest that Korean S. exigua subpopulations have little genetic differentiation mostly due to their significant migratory capacity.

Keywords

Spodoptera exigua;Genetic analysis;Polymorphism;Allozyme;Genetic distance