<abstract xmlns="http://www.w3.org/1999/xhtml"><p> Ecologically based management of white spruce (Picea glauca [Moench] Voss.) requires an understanding of its patterns of adaptive variation. This understanding will become increasingly important under changing climate conditions. Five common garden tests and a greenhouse trial established in 2002 across Ontario were used to assess levels of genetic variation and relate this variation to local climate. Growth and phenological variables, including height, root collar diameter, survival, timing of spring budflush, and timing of fall budset were measured. Intraclass correlation coefficients were calculated for all traits to determine levels of genetic variation. Simple linear regressions were used to relate these differences to local climate conditions. After two growing season’s levels of between-provenance genetic variation ranged from 0 percent for several of the budflush variables to 22 percent for 2003 survival at the Englehart field trial. Overall, growth variables showed higher levels of between-provenance variation than phenological variables. Variation was predominately explained by longitude, a surrogate for precipitation patterns in Ontario, and temperature variables related to the growing season with r2 values ranging from 0.03 to 0.55. Generally, patterns of adaptive variation followed a southeast to northwest trend across Ontario. Northern sources flushed earlier and set bud earlier, while southern sources demonstrated superior growth. Results support previous white spruce genecology studies showing superior growth of sources from the Ottawa valley region of Ontario and Quebec.</p></abstract>

Ecologically based management of white spruce (Picea glauca [Moench] Voss.) requires an understanding of its patterns of adaptive variation. This understanding will become increasingly important under changing climate conditions. Five common garden tests and a greenhouse trial established in 2002 across Ontario were used to assess levels of genetic variation and relate this variation to local climate. Growth and phenological variables, including height, root collar diameter, survival, timing of spring budflush, and timing of fall budset were measured. Intraclass correlation coefficients were calculated for all traits to determine levels of genetic variation. Simple linear regressions were used to relate these differences to local climate conditions. After two growing season’s levels of between-provenance genetic variation ranged from 0 percent for several of the budflush variables to 22 percent for 2003 survival at the Englehart field trial. Overall, growth variables showed higher levels of between-provenance variation than phenological variables. Variation was predominately explained by longitude, a surrogate for precipitation patterns in Ontario, and temperature variables related to the growing season with r2 values ranging from 0.03 to 0.55. Generally, patterns of adaptive variation followed a southeast to northwest trend across Ontario. Northern sources flushed earlier and set bud earlier, while southern sources demonstrated superior growth. Results support previous white spruce genecology studies showing superior growth of sources from the Ottawa valley region of Ontario and Quebec.

Genetic Variation in Picea glauca for Growth and Phenological Traits From Provenance Tests in Ontario

Silvae Genetica

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.

Ecologically based management of white spruce (Picea glauca [Moench] Voss.) requires an understanding of its patterns of adaptive variation. This understanding...

Genetic Variation in Picea glauca for Growth and Phenological Traits From Provenance Tests in Ontario

Publié en ligne: 27 oct. 2017

Pages: 141 - 148

Reçu: 10 sept. 2004

DOI: https://doi.org/10.1515/sg-2004-0026

Mots clés
Picea glauca, white spruce, genetic variation, adaptive variation, provenance trials, intraclass correlation coefficient, climate

© 2017

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.

Genetic Variation in Picea glauca for Growth and Phenological Traits From Provenance Tests in Ontario

Publié en ligne: 27 oct. 2017

Pages: 141 - 148

Reçu: 10 sept. 2004

DOI: https://doi.org/10.1515/sg-2004-0026

Mots clésPicea glauca, white spruce, genetic variation, adaptive variation, provenance trials, intraclass correlation coefficient, climate

© 2017

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.

Mots clés
Picea glauca, white spruce, genetic variation, adaptive variation, provenance trials, intraclass correlation coefficient, climate