Sponsor
The information in this document has been funded wholly (or in part) by the US Environmental Protection Agency.
Published In
Environmental and Experimental Botany
Document Type
Article
Publication Date
10-1998
Subjects
Acclimatization (Plants), Douglas fir -- Growth -- Effect of, Douglas fir -- Climatic factors, Global temperature changes
Abstract
Global climatic change as expressed by increased CO2 and temperature has the potential for dramatic effects on trees. To determine what its effects may be on Pacific Northwest forests, Douglas-fir (Pseudotsuga menziesii ) seedlings were grown in sun-lit controlled environment chambers at ambient or elevated (+4°C above ambient) temperature, and at ambient or elevated (+200 ppm above ambient) CO2. In 1995–1996 and 1996–1997, elevated CO2 had no effect on vegetative bud morphology, while the following unusual morphological characteristics were found with greater frequency at elevated temperature than at ambient: rosetted buds with reflexed and loosened outer scales, convoluted inner scales, clusters of small buds, needles elongating between scales, needle primordia with white, hyaline apical extensions, and buds with hardened scales inside of unbroken buds. Buds became rosetted in elevated temperature chambers after temperatures exceeded 40°C in July, 1996. Rosettes were induced within 48-h in buds placed in a 40°C oven; fewer rosettes formed at 20°C. Induction was reversible in buds transferred from 40 to 20°C, implying that rosetting is a physical rather than a growth phenomenon. It appears that rosettes form after long-term exposure to elevated temperature and after shorter periods of exposure to intense heat. Elevated temperature influences bud morphology and may therefore influence the overall branching structure of Douglas-fir seedlings.
DOI
10.1016/S0098-8472(98)00031-8
Persistent Identifier
http://archives.pdx.edu/ds/psu/12657
Citation Details
Apple, M. E., Lucash, M. S., Olszyk, D. M., & Tingey, D. T. (1998). Morphogenesis of Douglas-fir buds is altered at elevated temperature but not at elevated CO2. Environmental And Experimental Botany, 40(2), 159-1.
Included in
Environmental Monitoring Commons, Other Ecology and Evolutionary Biology Commons, Other Environmental Sciences Commons, Plant Biology Commons
Description
The information in this document has been funded wholly (or in part) by the US Environmental Protection Agency. It has been subjected to the Agency’s peer and administrative review, and it has been approved for publication as an EPA document.
This work was authored as part of the Contributor's official duties as an Employee of the United States Government and is therefore a work of the United States Government. In accordance with 17 U.S.C. 105, no copyright protection is available for such works under U.S. Law.
The published article is copyrighted by Elsevier and can be found at: http://dx.doi.org/10.1016/S0098-8472(98)00031-8