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| ▒ Home | > | | 연구정보 (Information) | > | 국내연구정보 (Domestic information) |
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| Genetic Parameters with Age and Site 조기검정을 위한 수령 및 입지별 생장과 유전모수 |
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| 글쓴이 : 관리자
날짜 : 08-05-23 13:07
조회 : 9732
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Trends in Genetic Parameters with Age and Site for Early Implications of Genetic Improvement in Korean White Pine 잣나무의 유전적 형질 개량의 조기검정을 위한 수령 및 입지별 생장과 유전모수의 특성에 관한 연구 <한국임학회지 79(1):56-70 Jour. Kor. For. Soc. 79(1):56-70 1990>
Eighteen Korean white pine (Pinus koraiensis S. et Z.) families were tested in 3 different regions from age 5 to 9. Family and site were significant sources of variation for seedling survival and field growth, whereas the effects of family site interaction were relatively small as compared with the former sources of variation. Variance components estimated from the separate and combined sites indicated that the most variabilities were associated with individual trees within plot. Family x site interaction components as a percentage of family variance decreased sharply with age. Heritability estimates varied with testing site and tree age. Combined analyses, however, showed a moderate change in heritability with increasing tree ages, and demonstrated high and stable trends of estimates, particularly in family heritabilities of tree height (hF2= 0.789-0.798).
The gains estimated from combined analysis have expected maximum or near-maximum efficiencies at age 6 or 7. Given equal intensity of selection, mass selection showed the most efficient gains within and across the sites. However, for the differences between mass and combined selections are small, selection made on the combination of family and within family would be more effective in improving genetic gains. Indirect selection method indicated that 5- and 6-years height were all good predictors of 9-year-old height with little loss of relative efficiency (less than 10%) as compared with direct family selection at age 9. Phenotypic and genetic correlations computed on the basis of family mean values of height and diameter have shown predominantly high, positive, and statistically significant (1% level) relationships between all tested pairs of traits, which indicates that family growth maintained statistically consistent trends with age. The best families are those that maintained a stable superiority overall sites and ages in growth performance, therefore, it can be suggested that early identification of superior families at age 9 is feasible at age 5 or 6 in Pinus koraiensis.
Key words: vriance components, heritability, genetic gain, selection, phenotypic and genetic correlations
잣나무의 풍매차대검정림을 충북 영동군, 경기도 광주군 및 가평군의 3개 지역에 조성하고, 묘목의 생존율과 산지 5년 동안(5년생-9년생)의 수고 및 근원경 생장을 조사하였다. 산지 식재 후 묘목의 생존율과 생장은 가계와 식재지에 따라 큰 차를 나타내었다. 생장의 변이를 나타내는 가장 큰 분산요인은 플롯 내의 개체목 간에 있음을 알 수 있었으며 가계분산에 대한 가계x입지 상호작용의 분산비는 수령이 증가함에 따라 현저히 감소하였다. 유전력은 지역과 수령에 따라 차를 나나내었으나 Combined analysis에 의한 수고의 가계유전력(hF2= 0.789-0.798)은 높고 안정된 경향을 보여주었다. 선발에 의한 개량효과는 가계선발과 가계내 개체선발을 동시에 실시하는 연합선발에 의하는 것이 바람직한 것으로 여겨진다. 가계선발의 경우, 5,6년생에서 간접선발은 9년생에서의 직접선발에 비하여 90% 이상의 상대효율을 얻을 수 있었으므로 조기선발의 가능성을 나타내었고, 5년생부터 9년생까지의 수령간 상관을 구해본 결과 표현형 및 유전상관 모두 고도 유의성을 인정할 수 있었다.
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