Light absorption and light-use efficiency of juvenile white spruce trees in natural stands and plantations

2016 ◽  
Vol 376 ◽  
pp. 158-165 ◽  
Author(s):  
Andrew S. Nelson ◽  
Robert G. Wagner ◽  
Michael E. Day ◽  
Ivan J. Fernandez ◽  
Aaron R. Weiskittel ◽  
...  
Keyword(s):  
Light Absorption ◽  
White Spruce ◽  
Light Use Efficiency ◽  
Use Efficiency ◽  
Natural Stands

scholarly journals Light absorption, light use efficiency and productivity of 16 contrasted genotypes of several Eucalyptus species along a 6-year rotation in Brazil

2019 ◽  
Vol 449 ◽  
pp. 117443 ◽  
Author(s):  
Guerric le Maire ◽  
Joannès Guillemot ◽  
Otavio C. Campoe ◽  
José-Luiz Stape ◽  
Jean-Paul Laclau ◽  
...  
Keyword(s):  
Light Absorption ◽  
Eucalyptus Species ◽  
Light Use Efficiency ◽  
Use Efficiency ◽  
Efficiency And Productivity

Stem production, light absorption and light use efficiency between dominant and non-dominant trees of Eucalyptus grandis across a productivity gradient in Brazil

2013 ◽  
Vol 288 ◽  
pp. 14-20 ◽  
Author(s):  
Otávio Camargo Campoe ◽  
José Luiz Stape ◽  
Yann Nouvellon ◽  
Jean-Paul Laclau ◽  
William L. Bauerle ◽  
...  
Keyword(s):  
Light Absorption ◽  
Eucalyptus Grandis ◽  
Light Use Efficiency ◽  
Productivity Gradient ◽  
Use Efficiency ◽  
Stem Production

Enhanced light interception and light use efficiency explain overyielding in young tree communities

2021 ◽  
Author(s):  
Laura J. Williams ◽  
Ethan E. Butler ◽  
Jeannine Cavender‐Bares ◽  
Artur Stefanski ◽  
Karen E. Rice ◽  
...  
Keyword(s):  
Light Interception ◽  
Light Use Efficiency ◽  
Young Tree ◽  
Tree Communities ◽  
Use Efficiency

scholarly journals No Evidence of an Impact on the Rhizosphere Diazotroph Community by the Expression of Bacillus thuringiensis Cry1Ab Toxin by Bt White Spruce

2007 ◽  
Vol 73 (20) ◽  
pp. 6577-6583 ◽  
Author(s):  
Josyanne Lamarche ◽  
Richard C. Hamelin
Keyword(s):  
Bacillus Thuringiensis ◽  
Bacterial Communities ◽  
White Spruce ◽  
Sequencing Analysis ◽  
Nitrogen Fixing ◽  
Cloning And Sequencing ◽  
Insecticidal Toxin ◽  
Soil Bacterial Communities ◽  
Cry1ab Toxin ◽  
Natural Stands

ABSTRACT Nitrogen fixation is one of the most important roles played by soil bacterial communities, as fixation supplies nitrogen to many ecosystems which are often N limited. As impacts on this functional group of bacteria might harm the ecosystem's health and reduce productivity, monitoring that particular group is important. Recently, a field trial with Bt white spruce, which constitutively expresses the Cry1Ab insecticidal toxin of Bacillus thuringiensis, was established. The Bt white spruce was shown to be resistant to spruce budworm. We investigated the possible impact of these genetically modified trees on soil nitrogen-fixing bacterial communities. The trial consisted of untransformed controls, GUS white spruce (transformed with the β-glucuronidase gene), and Bt/GUS white spruce (which constitutively expresses both the Cry1Ab toxin and β-glucuronidase) in a random design. Four years after planting, soil samples from the control and the two treatments from plantation as well as from two natural stands of white spruce were collected. Diazotroph diversity was assessed by extracting soil genomic DNA and amplifying a region of the nitrogenase reductase (nifH) gene, followed by cloning and sequencing. Analysis revealed that nitrogen-fixing communities did not differ significantly among the untransformed control, GUS white spruce, and Bt/GUS white spruce. Nevertheless, differences in diazotroph diversity were observed between white spruce trees from the plantation site and those from two natural stands, one of which grew only a few meters away from the plantation. We therefore conclude, in the absence of evidence that the presence of the B. thuringiensis cry1Ab gene had an effect on diazotroph communities, that either site and/or field preparation prior to planting seems to be more important in determining diazotroph community structure than the presence of Bt white spruce.

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