eCite Digital Repository

Genetic basis of aboveground productivity in two native Populus species and their hybrids


Lojewski, NR and Fischer, DG and Bailey, J and Schweitzer, J and Whitham, TG and Hart, SC, Genetic basis of aboveground productivity in two native Populus species and their hybrids, Tree Physiology: An International Botanical Journal, 29, (9) pp. 1133-1142. ISSN 0829-318X (2009) [Refereed Article]

DOI: doi:10.1093/treephys/tpp046


Demonstration of genetic control over riparian tree productivity has major implications for responses of riparian systems to shifting environmental conditions and effects of genetics on ecosystems in general. We used field studies and common gardens, applying both molecular and quantitative techniques, to compare plot-level tree aboveground net primary productivity (ANPP tree) and individual tree growth rate constants in relation to plant genetic identity in two naturally occurring Populus tree species and their hybrids. In field comparisons of four cross types (Populus fremontii S. Wats., Populus angustifolia James, F1 hybrids and backcross hybrids) across 11 natural stands, productivity was greatest for P. fremontii trees, followed by hybrids and lowest in P. angustifolia. A similar pattern was observed in four common gardens across a 290 m elevation and 100 km environmental gradient. Despite a doubling in productivity across the common gardens, the relative differences among the cross types remained constant. Using clonal replicates in a common garden, we found ANPPtree to be a heritable plant trait (i.e., broad-sense heritability), such that plant genetic factors explained between 38% and 82% of the variation in ANPPtree. Furthermore, analysis of the genetic composition among individual tree genotypes using restriction fragment length polymorphism molecular markers showed that genetically similar trees also exhibited similar ANPPtree. These findings indicate strong genetic contributions to natural variation in ANPP with important ecological implications.

Item Details

Item Type:Refereed Article
Research Division:Environmental Sciences
Research Group:Ecological applications
Research Field:Ecosystem function
Objective Division:Environmental Management
Objective Group:Fresh, ground and surface water systems and management
Objective Field:Assessment and management of freshwater ecosystems
UTAS Author:Bailey, J (Associate Professor Joe Bailey)
UTAS Author:Schweitzer, J (Dr Jen Schweitzer)
ID Code:73633
Year Published:2009
Web of Science® Times Cited:36
Deposited By:Research Division
Deposited On:2011-10-19
Last Modified:2011-10-19

Repository Staff Only: item control page