Skip to page content
USDA Forest Service
  
Treesearch

Research & Development Treesearch

 
Treesearch Home
About Treesearch
Contact Us
Research & Development
Forest Products Lab
International Institute of Tropical Forestry
Northern
Pacific Northwest
Pacific Southwest
Rocky Mountain
Southern Research Station
Help
 

Science.gov - We Participate


USA.gov  Government Made Easy


Global Forest Information Service

US Forest Service
P.O. Box 96090
Washington, D.C.
20090-6090

(202) 205-8333

You are here: Home / Search / Publication Information
Bookmark and Share

Publication Information

View PDF (116 KB bytes)

Title: Photosynthetic productivity of aspen clones varying in sensitivity to tropospheric ozone

Author: Coleman, M.D.; Isebrands, J.G.; Dickson, R.E.; Karnosky, D.F.;

Date: 1995

Source: Tree Physiology 15, 585--592

Publication Series: Miscellaneous Publication

Description: Rooted cuttings from three aspen (Populus tremuloides Michx.) clones (216, 271 and 259, classified as high, intermediate and low in O3 tolerance, respectively) were exposed to either diumal O3 profiles simulating those of Michigan's Lower Peninsula (episodic treatments), or diurnal square-wave O3 treatments in open-top chambers in northern Michigan, USA. Ozone was dispensed in chambers ventilated with charcoal-filtered (CF) air. In addition, seedlings were compared to rooted cuttings in their response to episodic O3 treatments. Early in the season, O3 caused decreased photosynthetic rates in mature leaves of all clones, whereas only the photosynthetic rates of recently mature leaves of the O3-sensitive Clone 259 decreased in response to O3 exposure. During midseason, O3 caused decreased photosynthetic rate s of both recently mature and mature leaves of the O3-sensitive Clone 259, but it had no effect on the photosynthetic rate of recently mature leaves of the O3-tolerant Clone 216. Late in the season, however, photosynthetic rates of both recently mature and mature leaves of Clone 216 were lower than those of the control plants maintained in CF air. Ozone decreased the photosynthetic rate of mature leaves of Clone 271, but it increased or had no effect on the photosynthetic rate of recently mature leaves. Photosynthetic response patterns of seedlings to O3 treatment were similar to those of the clones, but total magnitude of the response was less, perhaps reflecting the diverse genotypes of the seedling population. Early leaf abscission was observed in all clones exposed to O3 ; however, Clones 216 and 259 lost more leaf area than Clone 271. By late August, leaf area in the highest O3 treatment had decreased relative to the controls by 26, 24 and 9% for Clones 216, 259 and 271, respectively. Ozone decreased whole-tree photosynthesis in all clones, and the decrease was consistently less in Clone 271 (23%) than in Clones 216 (56%) and 259 (56%), and was accompanied by declines in total biomass of 19, 28 and 47%, respectively. The relationship between biomass and whole-tree photosynthesis indicates that the negative impact of O3 on biomass in the clones was determined largely by lower photosynthetic productivity of the foliage, rather than by potential changes in the carbon relations of other plant organs.

Keywords: biomass production, leaf abscission, leaf age classes, photosynthesis, photosynthetic light-response curves, Populus tremuloides, whole-tree photosynthesis

Publication Notes:

  • We recommend that you also print this page and attach it to the printout of the article, to retain the full citation information.
  • This article was written and prepared by U.S. Government employees on official time, and is therefore in the public domain.
  • You may send email to pubrequest@fs.fed.us to request a hard copy of this publication. (Please specify exactly which publication you are requesting and your mailing address.)

XML: View XML

Citation:


Coleman, M.D.; Isebrands, J.G.; Dickson, R.E.; Karnosky, D.F. 1995. Photosynthetic productivity of aspen clones varying in sensitivity to tropospheric ozone. Tree Physiology 15, 585--592

 


 [ Get Acrobat ]  Get the latest version of the Adobe Acrobat reader or Acrobat Reader for Windows with Search and Accessibility

USDA logo which links to the department's national site. Forest Service logo which links to the agency's national site.