Genetic Variation in the Chemical Components of Eucalyptus globulus Wood

G3: Genes, Genomes, Genetics

Ana Alves³  Desmond J. Stackpole¹  José Rodrigues³  Brad M. Potts²  René E. Vaillancourt² 

[1] School of Plant Sciences and Cooperative Research Centre for Forestry, University of Tasmania, Hobart 7001, Tasmania, AustraliScion, Rotorua 3046, New ZealSchool of Plant Sciences and Cooperative Research Centre for Forestry, University of Tasmania, Hobart 7001, Tasmania, AustraliSchool of Plant Sciences and Cooperative Research Centre for Forestry, University of Tasmania, Hobart 7001, Tasmania, AustraliScion, Rotorua 3046, New ZealScion, Rotorua 3046, New ZealSchool of Plant Sciences and Cooperative Research Centre for Forestry, University of Tasmania, Hobart 7001, Tasmania, AustraliScion, Rotorua 3046, New Zeal;School of Plant Sciences and Cooperative Research Centre for Forestry, University of Tasmania, Hobart 7001, Tasmania, AustraliSchool of Plant Sciences and Cooperative Research Centre for Forestry, University of Tasmania, Hobart 7001, Tasmania, AustraliSchool of Plant Sciences and Cooperative Research Centre for Forestry, University of Tasmania, Hobart 7001, Tasmania, Australi;Forestry and Forest Products Center, Tropical Research Institute of Portugal (IICT), Tapada Ajuda, 1349-017 Lisboa, PortugalForestry and Forest Products Center, Tropical Research Institute of Portugal (IICT), Tapada Ajuda, 1349-017 Lisboa, PortugalForestry and Forest Products Center, Tropical Research Institute of Portugal (IICT), Tapada Ajuda, 1349-017 Lisboa, Portugal

关键词: tree improvement;    wood chemicals;    adaptation;    lignin;    cellulose;    extractives;    syringyl;    guaiacyl;   

DOI  :  10.1534/g3.111.000372

学科分类：生物科学（综合）

来源: Genetics Society of America

【 摘 要 】

Despite the ecological and economic importance of lignin and other wood chemical components, there are few studies of the natural genetic variation that exists within plant species and its adaptive significance. We used models developed from near infra-red spectroscopy to study natural genetic variation in lignin content and monomer composition (syringyl-to-guaiacyl ratio [S/G]) as well as cellulose and extractives content, using a 16-year-old field trial of an Australian tree species, Eucalyptus globulus. We sampled 2163 progenies of 467 native trees from throughout the native geographic range of the species. The narrow-sense heritability of wood chemical traits (0.25–0.44) was higher than that of growth (0.15), but less than wood density (0.51). All wood chemical traits exhibited significant broad-scale genetic differentiation (Q_ST = 0.34–0.43) across the species range. This differentiation exceeded that detected with putatively neutral microsatellite markers (F_ST = 0.09), arguing that diversifying selection has shaped population differentiation in wood chemistry. There were significant genetic correlations among these wood chemical traits at the population and additive genetic levels. However, population differentiation in the S/G ratio of lignin in particular was positively correlated with latitude (R² = 76%), which may be driven by either adaptation to climate or associated biotic factors.

【 授权许可】

Unknown