Skip to main content

Autumn Frost Resistance on Several Walnut Species: Methods Comparison and Impact of Leaf Fall

Buy Article:

$29.50 plus tax (Refund Policy)


Four walnut tree species, of value for their wood production, were evaluated for autumn cold resistance: Juglans regia L., Juglans nigra L., Juglans major Torr. A. Heller, and Juglans ×intermedia. Early frost events damage and reduce wood quality and lengthen timber harvesting rotation. The frost vulnerability of these species could be an even more important problem in the future, depending on which Mediterranean climatic scenario develops. The work is based on the use of the chlorophyll fluorescence parameter Fv/Fm—measured in cortical bark chlorenchyma—as a reliable estimator of freezing injuries in Juglans. Two methods traditionally used to evaluate the effects of frost on deciduous trees were also analyzed: visual damage and relative electrolyte leakage. The study was carried out using annual woody shoots collected in November 2009, which were subjected to low temperatures (from 5° C to −16.5° C) in a controlled cold chamber. The relationship between leaf fall stages and autumn frost damage has also been discussed. The results obtained using the different methods studied were comparable. No injuries were detected in any species until the temperature dropped below −8.5° C. In the study, black walnut clones were the most resistant to subzero temperatures, J. regia were the least, and J. ×intermedia showed an intermediate behavior with respect to its genitors. The assessment of cold damage using the Fv/Fm parameter was easy and quick. It seems that this would be particularly useful for screening a large number of samples.

Keywords: Fv/Fm; Juglans; frost hardiness; leaf fall; low temperatures

Document Type: Research Article


Publication date: 2013-10-15

More about this publication?
  • Forest Science is a peer-reviewed journal publishing fundamental and applied research that explores all aspects of natural and social sciences as they apply to the function and management of the forested ecosystems of the world. Topics include silviculture, forest management, biometrics, economics, entomology & pathology, fire & fuels management, forest ecology, genetics & tree improvement, geospatial technologies, harvesting & utilization, landscape ecology, operations research, forest policy, physiology, recreation, social sciences, soils & hydrology, and wildlife management.
    Forest Science is published bimonthly in February, April, June, August, October, and December.

    2015 Impact Factor: 1.702
    Ranking: 16 of 66 in forestry

    Average time from submission to first decision: 62.5 days*
    June 1, 2016 to Feb. 28, 2017

    Also published by SAF:
    Journal of Forestry
    Other SAF Publications
  • Submit a Paper
  • Membership Information
  • Author Guidelines
  • Podcasts
  • Ingenta Connect is not responsible for the content or availability of external websites
  • Access Key
  • Free content
  • Partial Free content
  • New content
  • Open access content
  • Partial Open access content
  • Subscribed content
  • Partial Subscribed content
  • Free trial content
Cookie Policy
Cookie Policy
Ingenta Connect 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