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 (1,015 KB)

Title: Susceptibility of Juglans Species andInterspecific Hybrids to Agrobacterium tumefaciens

Author: McKenna, James R.; Epstein, Lynn;

Date: 2003

Source: HortScience 38(3):435-439

Publication Series: Scientific Journal (JRNL)

Description: Crown gall, caused by the common soil-borne bacterium Agrobacterium tumefaciens, can be an economic problem in walnut nurseries and production orchards in Caliiornia. The principal rootstocks used for commercial walnut production in California are the native Northern California black walnut, Juglans hindsii, and "Paradox," which are interspecific hybrids between a black walnut, primarily J. hindsii, as the maternal parent, and J. regia, the English walnut, as the paternal parent. Receat evidence has shown that some commercial black walnut trees producing Paradox hybrid seedlings are actually hybrids between Juglans hindsii and two other North American black walnut species, J. major and J. nigra. Here, we document that there was a higher incidence of crown gall on Paradox (Juglans hindsii x J. regia) than on Juglans hindsii in three sites with natural soil inoculum. Paradox seedlings (with a female parent that was primarily Juglans hindsii with some J. nigra) inoculated with A. tumefaciens on the roots during transplanting had a higher incidence of crown gall than either Juglans hindsii or J. regia. When stems were inoculated with A. tumefaciens, Juglans hindsii x J. regia populations had significantly larger galls than either Juglans hindsii or J. regia Similarly, in stem inoculations on four out of six Paradox gemotypes with a hybrid black walnut maternal parent, the progeny produced significantly larger galls than either Juglans hindsii or J. regia, However, two Paradox populations from black walnut hybrids that contained J. major, J. nigra, and Juglans hindsii produced galls that were no different in size than in the black walnut species and J. regia Results suggest that J. regia and black walnut species are less susceptible to crown gall than most Paradox populations.

Keywords: crown gall, resistance, rootstocks, Paradox, Rhizobium radiobacter, walnut

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.
  • This publication may be available in hard copy. Check the Northern Research Station web site to request a printed copy of this publication.
  • Our on-line publications are scanned and captured using Adobe Acrobat. During the capture process some typographical errors may occur. Please contact Sharon Hobrla, shobrla@fs.fed.us if you notice any errors which make this publication unusable.

XML: View XML

Citation:


McKenna, James R.; Epstein, Lynn 2003. Susceptibility of Juglans Species andInterspecific Hybrids to Agrobacterium tumefaciens. HortScience 38(3):435-439

 


 [ 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.