Comparison of phenotypic and genetic selections in Scots pine (Pinus sylvestris L.) single tree plot half-sib progeny tests

• Autorzy: Kowalczyk J
• Języki publikacji: EN

Abstrakty

EN

The study was carried out in three Scots pine (Pinus sylvestris L.) single tree plot half-sib progeny tests planted in 1984–86. Phenotypic selection was done in two ways: F about 0.5% to 1% of the total number of trees were chosen by the author on the basis of their appearance only, and Fbis on the basis of diameters at breast height and heights measurements and observations scored for individual trees. The best trees were selected on the basis of the index value weighing traits by their economic value. Genetic selection was performed based on both family index value (Wf) and tree index value (WT), weighing traits by heritability and economic value. This was done in four different ways: (A) The best trees were selected only on the basis of their index value (WT) with no attention paid to the family; (B) About 10 to 12 trees were selected in the best families, (both (Wf) and (WT) were taken into consideration); (C) The best 30% of the families (Wf) were selected and then equal numbers of best trees were selected (WT); (D) The same number families (Wf) as in the phenotypic selection were selected and within these families equal numbers of best trees (WT). The number of trees that were genetically selected was always the same as the number of phenotypically selected ones (selection type F). The selections were compared using a calculated expected genetic gain and the relative loss of effective population size. As expected, phenotypic selection resulted in the lowest genetic gain. Phenotypic selection generally conserved genetic variability, while genetic selection reduced it, especially when genetic gain was maximised. Phenotypic selection type F generally identifies the good families. The agreement of genetic selection with the phenotypic selection is low (0% to 19%) at the individual tree level. This is slightly better with phenotypic selections using measurements data (Fbis). Phenotypic selection is recommended only where information concerning pedigrees is not available. It can provide a simple and cheap way of obtaining material for future selection. Genetic selection method (A) where best trees were selected without any restrictions provided highest genetic gain and cause the greatest loss of genetic diversity.

Słowa kluczowe

EN

Scotch pine; Pinus sylvestris; genetic selection; phenotypic selection; selection index; heritability; genetic gain; genetic diversity; progeny test; statistical method

• Wydawca: -
• Czasopismo: Dendrobiology
• Rocznik: 2005
• Tom: 53
• Opis fizyczny: p.45-56,fig.,ref.

Twórcy

autor

Kowalczyk J

• Forest Research Institute, Bitwy Warszawskiej 1920 r. No 3, 00-973 Warsaw, Poland

Bibliografia

• Anderson E. W., Lindgren D., Spanos K. A., Mullin T. J. 1998a. Genetic diversity after one round of selection. Forest Tree Improvement 26: 1–9.
• Anderson E. W., Spanos K. A., Mullin T. J., Lindgren D. 1998b. Phenotypic selection compared to restricted combined index selection for many generations. Silva Fennica 32 (2): 111–120.
• Anderson E.W., Spanos K.A., Mullin T.J, Lindgren D. 1998c. Phenotypic selection can be better than selection for breeding value. Scandinavian Journal of Forest Research 13: 7–11.
• Cotterill P.P., Jackson N. 1989. Gains expected from clonal orchards under alternative breeding strategies. Forest Science 35 (1): 183–196.
• David A., Pike C., Stine R. 2003. Comparison of selection methods for optimizing genetic gain and gene diversity in a red pine (Pinus resinosa Ait.) seedling seed orchard. Theoretical and Applied Genetics 107: 5, 843–849.
• Dempster E. R., Lerner I. M. 1950. Heritability of threshold characters. Genetics 35: 212–236.
• Falconer D. S. 1974. Dziedziczenie cech ilościowych. PWN. Warszawa, 257.
• Falconer D. S., Mackay T. F. C. 1996. Introduction to Quantitative Genetics. Longman. London.
• Giertych M. 1993. Zmienność proweniencyjna. In: Biologia sosny zwyczajnej. Sorus. Poznań–Kórnik: 325–339.
• Giertych M. 1995. Zmienność rodowa sosny i wybór drzew elitarnych. Arboretum Kórnickie 40: 55–70.
• Giertych M., Mąka A. 1994. Ocena indeksowa dziewięcioletnich rodów sosny (Pinus sylvestris L.) z kontrolowanych krzyżówek na plantacji nasiennej. Arboretum Kórnickie 33: 87–107.
• Hill. W. G., Smith. C. 1977. Alternative response. Biometrics 33: 234–236.
• Kocięcki S. 1988. Wytyczne w sprawie selekcji drzew na potrzeby nasiennictwa leśnego. Prace IBL. Seria B. 7.
• Ledig 1974. An analysis of methods for the selection of trees from wild stands. Forest Science 20 (1): 2–16.
• Matras J. 1989. Badania proweniencyjne Zakładu Nasiennictwa i Selekcji IBL z sosną pospolitą. Sylwan 133 (11–12): 53–66.
• Matras J. 1996. Rejestr bazy nasiennej w Polsce. Instytut Badawczy Leśnictwa. Warszawa. pp. 328.
• McGuirk B.J. 1989. The estimation of genetic parameters for all-or-none and categorical traits. In: Evolution and Animal Breeding (eds. W.G. Hill, T.F.C. Mackay). pp 175–180. CAB International. Wallingford. Oxon. U.K.
• Pswarayi I.Z., Barnes R.D. 1994. Genetic gains expected from phenotypic and combined index selection in Pinus elliottii. Zimbabwe Forestry Commission Research Paper No. 5.
• Robertson A. 1961. Inbreeding in artificial selection programs. Genetical Research 2: 189–194.
• Robertson A., Lerner I. M. 1949. The heritability of all–or–none traits: viability of poultry. Genetics 34: 395–411.
• Urbański K. 1998. Wyniki 30-letnich doświadczeń rodowych sosny zwyczajnej (Pinus sylvestris L.). Kongres Leśników Polskich. Materiały i dokumenty. Vol. II. Referaty: 347–352.
• Van Vleck L. D. 1972. Estimation of heritability of threshold characters. Journal of Dairy Science 55: 218–225.
• Wei R.P. 1995. Optimal restricted phenotypic selection. Theoretical and Applied Genetics 91: 389–394.
• Wei R.P. 1996. Loss of genetic diversity following selection from populations with a family structure. Silvae Genetica. 45 (2–3): 153–159.
• Wei R.P., Lindgren D. 1991. Selection effects on diversity and gain. Silva Fennica 25 (4): 230–234.
• Wei R.P., Hansen C.R., Dhir N.K., Yeh F.C. 1998. Genetic gain with desired number in breeding programs: a study on selection effects. Canadian Journal of Forest Research 28: 1861–1869.
• Wei R.P., Lindgren D. 1994. Gain and Effective Population Size Following Index Selection with Variable Weights. Forest Genetics 1 (3): 147–155.
• Zobel B. J., Talbert J. 1984. Applied forest tree improvement. John Wiley and Sons. New York.