Heritability and Expected Gain Estimates for Traits of Scotch Pine Christmas Tree Seed Sources

Abstract

Forty-five full-sib families of Scotch pine (Pinus sylvestris L.) from an incomplete factorial mating design were planted in northeastern Kansas in 1981. The trees were evaluated in 1986 for survival, height growth, crown width, taper (crown width/height), number of stems per tree, the presence or absence of stem crooks, and the number of full faces. Needle length and needle color were measured at a consistent location on each tree in December 1987. Individual tree heritabilities were high; 49.68% for taper, 61.64% for crown width, 66.83% for height, and 71.46% for needle length. Estimated genetic gains showed that rapid improvements through selection are possible for these four traits. Combined selection consistently had the highest percentage gain and is the recommended selection procedure. Genetic correlation indicated that taper is negatively correlated with height (-0.651). Therefore, because of the commercial importance of form, selection for rapid height growth should not be the emphasis in future breeding efforts. West. J. Appl. For. 7(3):82-86.

Growth Differences in the Progeny Trials of the Scots Pine (Pinus sylvestris L.)

“…Tänu tugevale geneetilisele korrelatsioonile nii puu kõrguse ja tüve mahu kui ka puu rinnasdiameetri ja tüve mahu vahel saab neid näitajaid kasutada tüve mahu hindamisel (Eriksson et al, 1987). Oluliseks sammuks metsapuude parendamise programmides on leida head päritavuse hinnangud, et nende alusel valida geneetilise kontrolli all olevatest tunnustest head selektsiooni kriteeriumid (Diebel et al, 1992). Valiku efektiivsus oleneb suurel määral ka tunnuste arvust, mille järgi valikut tehakse.…”

About the heritability influence to the growth performance in Scots pine (Pinus sylvestris L.) progeny trials

“…Metsageneetikud peavad aretustegevuses hindama oluliste tunnuste geneetilise kontrolli tugevust ja massilise valiku efektiivsust (Danusevičius, 2000). Oluliseks sammuks metsapuude parendamise programmides on leida head päritavuse hinnangud, et nende alusel valida geneetilise kontrolli all olevatest tunnustest head selektsiooni kriteeriumid (Diebel et al, 1992). Seega osutub oluliseks kvantitatiivset tunnust iseloomustavaks näitajaks päritavuskoefitsient, mis seob indiviidi fenotüübi tema geneetilise konstitutsiooniga (genotüübiga) (Kaart, 1998).…”