Chlorophyll Fluorescence as a Measure of Cold Hardiness and Freezing Stress in 1 + 1 Douglas-Fir Seedlings

$29.50 plus tax (Refund Policy)

Buy Article:

Abstract:

Two-year-old seedlings of Douglas-fir (Pseudotsuga menziesii [Mirb.] Franco) from two seed lots with different levels of predicted cold hardiness were grown in separate nurseries. Seedlings were lifted every 4 wk from October 1991 through March 1992 and exposed to controlled freezing temperatures. Fluorescence emissions of the seedlings were measured before and 1 and 3 days after each freezing test. Destructive morphological assessments were made 7 days after freezing. Unstressed seedlings were measured during 6 additional test periods through September 1992. Chlorophyll fluorescence had a significant linear relationship to needle freezing damage and seedling survival, but there was no significant linear relationship between fluorescence of control seedlings and frost hardiness. The LT50 (lethal temperature for 50% of the seedlings) fluorescence measurements, however, tended to be lower before and higher after the seedlings were hardened off. These results indicate that chlorophyll fluorescence is capable of detecting nonvisible damage to seedlings. Continued research may show this to be a valuable tool for rapidly identifying damaged seedlings in nurseries and hence for aiding vital management decisions. For. Sci. 41(3):564-575.

Keywords: Photosynthesis; dormancy; seedling quality; stress physiology

Document Type: Journal Article

Affiliations: Faculty Research Assistant, Department of Forest Science, Oregon State University, Corvallis, OR 97331

Publication date: August 1, 1995

More about this publication?
  • Membership Information
  • ingentaconnect is not responsible for the content or availability of external websites
Related content

Tools

Favourites

Share Content

Access Key

Free Content
Free content
New Content
New content
Open Access Content
Open access content
Subscribed Content
Subscribed content
Free Trial Content
Free trial content
Cookie Policy
X
Cookie Policy
ingentaconnect website makes use of cookies so as to keep track of data that you have filled in. I am Happy with this Find out more