Korean Journal of Breeding Science (한국육종학회지)

The Korean Society of Breeding Science (한국육종학회)
권호 표지

Genetic Gain and Diversity in a Clonal Seed Orchard of Pinus Koraiensis Under Various Thinning Intensities

잣나무 클론 채종원에서 간벌 강도에 따른 개량효과와 유전다양성

  • Oh, C.Y. (Department of Forest Genetic Resources, Korea Forest Research Institute) ;
  • Han, S.U. (Department of Forest Genetic Resources, Korea Forest Research Institute) ;
  • Kim, C.S. (Department of Forest Genetic Resources, Korea Forest Research Institute) ;
  • Kang, K.S. (Department of Forest Genetic Resources, Korea Forest Research Institute) ;
  • Lee, B.S. (Korea Forest Seed and Variety Center)
  • 오창영 (국립산림과학원 산림유전자원부) ;
  • 한상억 (국립산림과학원 산림유전자원부) ;
  • 김장수 (국립산림과학원 산림유전자원부) ;
  • 강규석 (국립산림과학원 산림유전자원부) ;
  • 이병실 (국립산림품종관리센터)
  • Received : 2008.09.05
  • Published : 2008.09.10
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Abstract

Estimates of genetic gain (in volume growth) and diversity (expressed as status number, $N_s$) were determined in a clonal seed orchard of Pinus koraiensis. The genetic thinning was based on clonal breeding values (represented by general combining ability) obtained from progeny tests, clonal fertility estimated by strobilus production, and clonal size variation determined by the ramet numbers per clone. Parental GCA values for volume growth were calculated, based on height and diameter at breast height measured from field trials. Clonal fertility was estimated from the assessments of strobilus production over twelve years from 1991 to 2003, and used for the calculation of status number. There are 179 clones and 5,268 ramets in 12ha area of P. koraiensis clonal seed orchard. Genetic gain and diversity estimates were determined under assumptions of 30% pollen contamination and inferior genetic value of contaminating pollen. Genetic gain increased as thinning rates were set from 10% to 60%. However, for the higher thinning intensities, the increase of genetic gain was not remarkable. Genetic thinning by means of truncation selection resulted in a greater genetic gain but a large decrease in status number. Status number was represented around 40 clones for 10% through 60% thinning intensities, but for the higher thinning intensities, it was a bit fluctuated. Based on the present results, it could be concluded that thinning rate should not be stronger than 60% to optimize genetic gain while conserving genetic diversity. Consequently 50% or 60% thinning rate might be appropriate for genetic thinning in the clonal seed orchard of P. koraiensis. The effect of pollen contamination on the genetic gain and the consequence of genetic thinning for seed production in the clonal seed orchard, and seed orchard management scheme were also discussed.

잣나무 채종원의 유전간벌을 위하여 재적생장에 대한 개량 효과와 유효클론수를 이용한 유전다양성을 평가하였다. 유전 간벌은 클론의 일반조합능력으로 나타나는 육종가(breeding value), 암꽃과 수꽃 개화량을 이용한 종자생산 기여도, 클론별 ramet수 등를 이용한 클론별 변이를 기초로 하였다. 차대 검정 결과에 의하여 산출된 재적생장에 대한 클론별 일반조합능력(genetic value) 및 1991년부터 2003년까지 조사된 개화량 성적을 이용하여 잣나무 채종원(1981년 조성) 179클론에 대하여 간벌 강도에 따른 유전다양성 및 개량효과를 분석하였다. 이때 채종원 외부로부터의 화분오염율은 30%(gene migration = 15%)로 설정하였다. 그 결과 재적생장에 대한 개량효과는 간벌율이 10%에서 60%까지 높아짐에 따라서 점차 증가하였다. 하지만 이보다 더 높은 간벌 강도에서 현저한 개량효과 증가는 나타나지 않았다. 유효클론수는 간벌강도 10%에서 60% 사이에서는 40클론으로 나타났으며, 70% 간벌율 이상에서는 증가하거나 감소하는 변동을 나타냈다. 따라서 본 잣나무 채종원에 대해서는 50%에서 60% 수준의 간벌 강도가 적당한 것으로 판단된다.

Keywords

References

  1. Adams WT, Kipkins VD, Burczyk J, Randall WK. 1997. Pollen contamination trends in a maturing Douglas-fir seed orchard. Can. J. For. Res. 27:131-134 https://doi.org/10.1139/cjfr-27-1-131
  2. Askew GR, Burrows PM. 1993. Inbreeding prevalence in wind-pollinated conifer seed orchards. In:Advances in pollen management. USDA Forest Service, Agricultural handbook 698, pp. 65-68
  3. Bondesson FL, Lindgren D. 1993. Optimal utilization of clones and genetic thinning of seed orchards. Silvae Gent. 42:157-163
  4. El-Kassaby YA. Fashler AMK, Crown M. 1989. Variation in fruitfulness in a Douglas-fir seed orchard and its effect on crop management decisions. Silvae Genet. 38:113-121
  5. Gomory D, Bruchanik R, Paule L. 2000. Effective population number estimation of three Scots pine (Pinus sylvestris L.) seed orchards based on an integrated assessment of flowering, floral phenology, and seed orchard design. For. Gent. 7:65-75
  6. Griffin AR. 1982. Clonal variation in radiata pine seed orchards. I. Some flowering, cone and seed production traits. Aust. For. Res. 12:295-302
  7. Han SU, Choi SK, Kwon HM, Lee SB. 1985. Broad sense heritabilities of growth characters and genetic gain in clonal selection of plus tree of Pinus koraiensis S. et Z. J. Korean For. Soc. 69:1-5
  8. Han SU, Choi WY, Chung HG, Kang KS. 1997. Standardization of the general combining ability estimated from various environments and its application to the empirical data of the open-pollinated progenies of Pinus densiflora S. et Z. Res. Rep. For. Gen. Res. Inst. Korea. 33:47-53
  9. Han SU, Choi WY, Kang KS, Kim CS. 2006. General combining ability for volume growth of open-pollinated progenies of Korean pine (Pinus koraiensis). Proc. of the IUFRO working party 2.02.15 The Breeding and genetic resources of five-needle pines conference in the southern carpathians. Valiug, Romania. pp. 15-16
  10. Kang KS. 2001. Genetic gain and gen diversity of seed orchard crops. Ph.D. thesis. SLU-Umea, Sweden. Acta Universitatis Agriculturae Sueciae, Silvestria 187. 75pp
  11. Kang KS, Lindgren D. 1998. Fertility variation and its effect on the relatedness of seeds in Pinus densiflora, Pinus thunbergii and Pinus koraiensis clonal seed orchards. Silvae Genet. 47:196-201
  12. Kang KS, Lindgren D, Mullin TJ. 2001a. Prediction of genetic gain and gene diversity in seed orchard crops under alternative management strategies. Theor. Appl. Genet. 103:1099-1107 https://doi.org/10.1007/s001220100700
  13. Kang KS, Harju AM, Lindgren D, Nikkanen T, Almqvist C, Suh GU. 2001b. Variation in effective number of clones in seed orchards. New For. 21:17-33 https://doi.org/10.1023/A:1010785222169
  14. Kang KS, El-Kassaby YA, Choi WY, Han SU, Kim CS. 2003. Genetic gain and diversity caused by genetic thinning in a clonal seed orchard of Pinus densiflora. Silvae Gent. 52:220-223
  15. Kang KS, El-Kassaby YA, Han SU, Kim CS. 2005. Genetic gain and diversity under different thinning scenarios in a breeding seed orchard of Quercus accutissima. For. Ecol. Manage. 212:405-410 https://doi.org/10.1016/j.foreco.2005.03.063
  16. Lindgren D, Gea L, Jefferson P. 1996. Loss of genetic diversity monitored by status number. Silvae Genet. 45:52-59
  17. Lindgren D, Matheson AC. 1986. An algorithm for increasing the genetic quality of seed from seed orchards by using the better clones in higher proportions. Silvae Genet. 35: 173-177
  18. Lindgren D, Mullin TJ. 1998. Relatedness and status number in seed orchard crops. Can. J. For. Res. 28:276-283 https://doi.org/10.1139/cjfr-28-2-276
  19. Nikkanen T, Pukkala T. 1987. Making a thinning plan for seed orchards using a computer program. Folia Forestalia 701:26pp
  20. Nikkanen T, Ruotsalainen S. 2000. Variation in flowering abundance and its impact on the genetic diversity of the seed crop in a Norway spruce seed orchard. Silva Fen. 34:205-222
  21. Oh CY, Kang KS, Choi WY, Han SU, Kim CS. 2007. Seed orchard management considering the correlation between vegetative and reproductive traits in Pinus koraiensis S. et Z. Korean J. Breed. Sci. 39:419-426
  22. Savolainen O. 1991. Background pollination in seed orchards. p. 6-13. In:Lindgren D (ed.). Pollen contamination in seed orchards. Proc. Mtg. Nordic Group for Tree Breeding. Sweden
  23. Stoehr M, Webber J. Woods J. 2004. Protocol for rating seed orchard seed lots in British Columbia quantifying genetic gain and diversity. Forestry 77:297-303 https://doi.org/10.1093/forestry/77.4.297
  24. Williams CG, Askew GR. 1993. Alterative orchard designs. Agriculture Handbook 698:83-90. In:Bramlett DL, Askew Gr, Blush TD, Bridgwater FE and Jett JB (ed.). Advances in pollen management. USDA, Forest Service, Washington, DC