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ESTP 표지를 이용한 국내 소나무 집단의 유전변이

Genetic Variation of Pinus densiflora Populations in South Korea Based on ESTP Markers

홍용표|이제완|강호덕|홍경낙|안지영
한국자원식물학회 (The Plant Resources Society Of Korea)|2015.04|한국자원식물학회지 (Korean Journal of Plant Reources.)|제28권 제2호|pp. 279-289|DOI http://dx.doi.org/10.7732/kjpr.2015.28.2.279

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키워드

Genetic diversityPopulation genetic structureGenetic differentiationFST-outlier

초록

소나무의 유전다양성과 유전구조를 추정하기 위해 9개의ESTP 표지를 13개 소나무 집단에 적용하였다. 소나무 집단의유전다양성은 관찰된 대립유전자 수(A)가 2.2개, 유효 대립유전자 수(Ae)가 1.8개, 다형적 유전자좌 비율(P)이 98.8%, 이형접합도 관찰치(Ho)가 0.391, 이형접합도 기대치(He)가 0.402로 나타났다. 안강과 강릉 집단을 제외한 11개 집단이 하디-바인베르그 평형을 만족하였다. 집단간 유전분화도(FST)는 0.057으로, 동위효소나 nSSR 표지분석 결과보다 강하게 나타났다. 군집분석에서 집단의 유전적 거리와 지리적 분포간에 뚜렷한 연관성은 확인할 수 없었으며, 집단의 유전분화와 지리적 인접성도 상관이 없는 것으로 나타났다(Mantel 검증, r = 0.017, P = 0.344). 유전자좌에 대한 FST-outlier 분석을 실시한 결과, 빈도주의 방법에서는 FST 값이 신뢰하한 이하인 3개 유전자좌와 신뢰상한 이상인 3개 유전자좌가 특이값으로 추정되었고, 베이즈방법에서는 3개 유전자좌들만 특이값으로 확인되었다. 두 방법에서 공히 특이값으로 판정된 3개 유전자좌(sams2+AluⅠ, sams2+RsaⅠ, PtNCS_p14A9+HaeⅢ)중 sams2 표지에서 유래된 2개 유전자좌는 balancing selection의 영향을 받는 것으로추정되었다.

Abstract

Genetic diversity and genetic differentiation of thirteen Pinus densiflora populations in South Korea were estimated using nine ESTP (Expressed Sequence Tag Polymorphism) markers. The numbers of allele and the effective allele were 2.2 and 1.8, respectively. The percentage of polymorphic loci (P) was 98.8%. The observed and the expected heterozygosity were 0.391 and 0.402, respectively, and the eleven populations except for Ahngang and Gangneung population were under Hardy-Weinberg equilibrium state. The level of genetic differentiation (Wright’s FST = 0.057) was higher than those of isozyme or nSSR markers. We could not find out any relationship between the genetic distance and geographic distribution among populations from cluster analysis. Also, the genetic differentiation between populations was not correlated with the geographic distance (r = 0.017 and P = 0.344 from Mantel test). From the result of FST-outlier analysis to identify a locus under selection, six loci were detected at confidence interval of 99% by the frequentist’s method. However, only three loci (sams2+AluⅠ, sams2+RsaⅠ, PtNCS_p14A9+HaeⅢ) were presumed as outliers by Bayesian method. The sams2+AluⅠ and sams2+RsaⅠlocus were originated from the sams2 gene and seemed to be the loci under balancing selection.

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