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 (1.6 MB)

Title: Structural injury underlying mottling in ponderosa pine needles exposed to ambient ozone concentrations in the San Bernardino Mountains near Los Angeles, California

Author: Vollenweider, Pierre; Fenn, Mark E.; Menard, Terry; Gunthardt-Goerg, Madeleine; Bytnerowicz, Andrzej;

Date: 2013

Source: Trees 27:895-911

Publication Series: Scientific Journal (JRNL)

Description: For several decades, southern California experienced the worst ozone pollution ever reported. Peak ozone concentrations have, however, declined steadily since 1980. In this study, the structural injuries underlying ozone symptoms in needles of ponderosa pine (Pinus ponderosa Dougl. ex Laws.) collected in summer 2006 from one of the most polluted sites in the San Bernardino Mountains were investigated using serial sections examined by light and electron microscopy. Ozone-specific light-green diffuse mottling was observed in the currentyear needles, whereas older foliage showed brownish mottling similar to winter fleck injury. Especially, within the outer layers of mesophyll, many markers of oxidative stress, typical for ozone, were observed in both apoplast and symplast. Altogether within cells of mottles, these markers were indicative of hypersensitive-like response, whereas degenerative structural changes were diagnosed in the surrounding mesophyll. Evidence of drought stress and frost injury to older needles was also detected. Hence, mottling injury appeared to be primarily caused by ozone stress, however, other environmental stressors also determined the symptom morphology and distribution, especially within the older foliage.

Keywords: Ponderosa pine, Los Angeles basin, Ozone visible injury, Microscopic diagnosis, Needle histochemistry, Mesophyll ultrastructure

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.

XML: View XML

Citation:


Vollenweider, Pierre; Fenn, Mark E.; Menard, Terry; Gunthardt-Goerg, Madeleine; Bytnerowicz , Andrzej. 2013. Structural injury underlying mottling in ponderosa pine needles exposed to ambient ozone concentrations in the San Bernardino Mountains near Los Angeles, California. Trees 27:895-911. Published online Feb. 9, 2013; DOI 10.1007/s00468-013-0843-7.Springer-Verlag Berlin Heidelberg

 


 [ 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.