유전간벌 방법에 따른 굴참나무 육종채종원의 개량효과 추정
Estimation of genetic gain by genetic thinning methods in a breeding seed orchard of Quercus variabilis
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굴참나무 육종채종원에서 유전간벌 모형 및 다양한 간벌 강도에 따른 재적생장에 대한 개량효과 및유전다양성을 추정하였다. 유전간벌 모형은 개체간벌, 가계간벌 및 가계 내 개체간벌이었으며, 간벌강도는 개체목 기준으로 10% 단위로 적용하였다. 유효집단크기는 채종목 가계 간 유전적 유연관계를 나타내는 공동조상도를 이용하여 추정하였다. 유전간벌 모형에 있어 개체간벌이 가계간벌 및 가계 내 개체간벌 보다 모든 간벌강도에서 높은 개량효과가 추정되었다. 가계간벌은 모든 간벌강도에서 매우 낮은개량효과가 추정되어 본 굴참나무 채종원의 유전간벌 방법으로 적용하기에는 부적절한 것으로 판단되었다. 각 유전간벌 모형에 대한 유효집단크기를 추정한 결과, 가계간벌이 다른 간벌모형 보다 높은 유효집단크기가 추정되었다. 개체간벌은 약도의 강도에서는 일정하게 유지되었으나 강도의 간벌에서는 낮게추정되었으며, 가계 내 개체간벌은 중도의 간벌강도까지는 감소하는 경향을 나타내다가 강도의 간벌강도에서 다시 증가하였다. 이상의 결과를 종합하며, 50% 이하의 간벌강도를 적용할 경우에는 개체간벌이 효과적인 반면, 50% 이상의 간벌강도를 적용할 시에는 가계 내 개체간벌 방법이 효과적일 것으로판단된다.
Abstract
Genetic gain and gene diversity were estimated by genetic thinning methods under variousthinning intensities in a breeding seedling seed orchard of Quercus variabilis. The geneticthinning methods included individual thinning, family thinning and family+within family thinning. The thinning intensity was imposed by 10% intervals in the thinning methods. The genediversity was estimated by the concept of effective population size, which considered the geneticrelatedness(coancestry) among individuals. As the results, individual thinning showed highergenetic gain compared to the other methods. The family thinning gave the lowest genetic gain,so it could not be applied in this seed orchard. On the other hand, the family thinning wasmore effective to maintain gene diversity than the other methods. Individual thinning andfamily+within family thinning showed consistent gene diversity under week thinning intensities,but decreased under moderate intensities. In conclusion, individual thinning method could be effective under 50% thinning intensities and family+within family thinning method would beapplicable above 50% intensities for maximizing genetic gain and maintaining gene diversity inthe breeding seedling seed orchard of Quercus variabilis.
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