Kado, Clarence J. Department of Plant Pathology, University of California, Davis, California.
- Crown gall tumors
- Links to Primary Literature
- Additional Readings
A neoplastic disease of primarily woody plants, featuring abnormal growths (galls) that occur at the base of the stem or root crown or on other plant parts. Crown gall results from infection of plant wounds by the free-living soil bacterium Agrobacterium tumefaciens (also known as Rhizobium radiobacter), which is commonly associated with the roots of plants. It predominantly affects woody plants, although the disease can be reproduced in species representing more than 90 plant families. The first step in the infection process is the site-specific attachment of the bacteria to the plant host. Up to half of the bacteria become attached to host cells after 2 h. At 1 or 2 weeks after infection, swellings and overgrowths take place in tissue surrounding the site of infection. Eventually, these tissues proliferate into large tumors (see illustration). If infection takes place around the main stem or trunk of woody hosts, continued tumor proliferation will cause girdling and may kill the host. Crown gall is therefore economically important, particularly in nurseries where plant material for commercial use is propagated and disseminated. See also: Bacteria; Plant pathology
The content above is only an excerpt.
for your institution. Subscribe
To learn more about subscribing to AccessScience, or to request a no-risk trial of this award-winning scientific reference for your institution, fill in your information and a member of our Sales Team will contact you as soon as possible.
to your librarian. Recommend
Let your librarian know about the award-winning gateway to the most trustworthy and accurate scientific information.
AccessScience provides the most accurate and trustworthy scientific information available.
Recognized as an award-winning gateway to scientific knowledge, AccessScience is an amazing online resource that contains high-quality reference material written specifically for students. Contributors include more than 9000 highly qualified scientists and 43 Nobel Prize winners.
MORE THAN 8700 articles covering all major scientific disciplines and encompassing the McGraw-Hill Encyclopedia of Science & Technology and McGraw-Hill Yearbook of Science & Technology
115,000-PLUS definitions from the McGraw-Hill Dictionary of Scientific and Technical Terms
3000 biographies of notable scientific figures
MORE THAN 19,000 downloadable images and animations illustrating key topics
ENGAGING VIDEOS highlighting the life and work of award-winning scientists
SUGGESTIONS FOR FURTHER STUDY and additional readings to guide students to deeper understanding and research
LINKS TO CITABLE LITERATURE help students expand their knowledge using primary sources of information