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Titolo:
GROWTH-DIFFERENTIATION IN WHITE SPRUCE CROP TREE PROGENIES
Autore:
MAGNUSSEN S;
Indirizzi:
FORESTRY CANADA,PETAWAWA NATL FORESTRY INST CHALK RIVER K0J 1J0 ON CANADA
Titolo Testata:
Silvae Genetica
fascicolo: 4-5, volume: 42, anno: 1993,
pagine: 258 - 266
SICI:
0037-5349(1993)42:4-5<258:GIWSCT>2.0.ZU;2-X
Fonte:
ISI
Lingua:
ENG
Soggetto:
GLAUCA MOENCH VOSS; SIMULTANEOUS GENETIC GAIN; PICEA-GLAUCA; STAND DEVELOPMENT; SELECTION INDEX; WOOD DENSITY; HERITABILITY; PROVENANCES; PARAMETERS; POPULATION;
Keywords:
VARIANCE COMPONENTS; HERITABILITY; COEFFICIENT OF GENETIC PREDICTION; RANK STABILITY; GROWTH CURVES; VOLUME;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
49
Recensione:
Indirizzi per estratti:
Citazione:
S. Magnussen, "GROWTH-DIFFERENTIATION IN WHITE SPRUCE CROP TREE PROGENIES", Silvae Genetica, 42(4-5), 1993, pp. 258-266

Abstract

Stem analysis of 288 36-year-old dominant and codominant 'crop' treesin 18 white spruce open-pollinated families revealed a strong geneticcontrol of height growth (heritabilities of 0.3 to 0.6). Heritabilityestimates for volume growth peaked around age 20 when they reached a level of 0.3 only to decline rapidly thereafter. Rank stability and the coefficient of genetic prediction between age 36 family means and means obtained at earlier ages were not sufficiently strong to warrant early selection for either height or volume. Height-age and volume-age relationships were successfully modelled with a quadratic log-linear model with three interpretable parameters. Heritabilities of the growthcurve parameters varied from 0.14 to 0.72. The opportunity to improvethe growth curves by 20% for all ages was explored by using a restricted selection index of the growth curve parameters. An improvement of 6% to 12% in both height and volume per breeding cycle and unit selection intensity is realistic. Growth curve analysis is recommended for the analysis of longitudinal growth

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Documento generato il 05/12/20 alle ore 00:27:42