Featured Research

from universities, journals, and other organizations

New Clues Discovered About Divergent Origin Of Sudden Oak Death Pathogen

Date:
April 6, 2009
Source:
USDA/Agricultural Research Service
Summary:
Sudden oak death not only causes nearly instant death to the mighty oak trees of the western United States, but also has forced many tree nurseries out of business in that region. But a new discovery about the disease pathogen's distant past--perhaps as long ago as half a million years -- may offer clues to scientists about ways to thwart the disease.

The dying leaves on this an oak tree are an early sign of sudden oak death.
Credit: Photo by Peggy Greb

Sudden oak death not only causes nearly instant death to the mighty oak trees of the western United States, but also has forced many tree nurseries out of business in that region. But a new Agricultural Research Service (ARS) discovery about the disease pathogen’s distant past--perhaps as long ago as half a million years--may offer clues to scientists about ways to thwart the disease.

A study led by ARS plant pathologist Nik Grunwald and collaborators at ARS and North Carolina State University has uncovered the ancient history of the killer Phytophthora ramorum fungus that causes the disease. This discovery could shed light on how the spread of P. ramorum began, according to Grunwald, at the ARS Horticultural Crops Research Laboratory in Corvallis, Ore.

Prior to this study, the relatedness of the three distinct clonal lineages, or genetic descendants, of P. ramorum--EU1, NA1 and NA2--was not known. The three lineages of P. ramorum are recent introductions to North America and Europe, and their origin is unknown.

But Grunwald and his team, after years of extensive analysis of DNA sequence data, found that the three lineages are between 1.5 million and 5.4 million years old and have been independently genetically mutating--altering their genes--for at least 11 percent of their history. From an evolutionary standpoint, this is a significant amount of time, estimated to be from 165,000 to 500,000 years.

Their evidence showed that the European lineage may be older than the North American lineages, and that the three lineages have originated from three different geographic locations rather than one location, prior to introduction to Europe and North America.

There now needs to be even greater caution when approving plant material for introduction into the United States that could introduce additional strains of the pathogen, according to the researchers.


Story Source:

The above story is based on materials provided by USDA/Agricultural Research Service. Note: Materials may be edited for content and length.


Cite This Page:

USDA/Agricultural Research Service. "New Clues Discovered About Divergent Origin Of Sudden Oak Death Pathogen." ScienceDaily. ScienceDaily, 6 April 2009. <www.sciencedaily.com/releases/2009/03/090328152029.htm>.
USDA/Agricultural Research Service. (2009, April 6). New Clues Discovered About Divergent Origin Of Sudden Oak Death Pathogen. ScienceDaily. Retrieved July 30, 2014 from www.sciencedaily.com/releases/2009/03/090328152029.htm
USDA/Agricultural Research Service. "New Clues Discovered About Divergent Origin Of Sudden Oak Death Pathogen." ScienceDaily. www.sciencedaily.com/releases/2009/03/090328152029.htm (accessed July 30, 2014).

Share This




More Earth & Climate News

Wednesday, July 30, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

In Virginia, the Rise of a New Space Coast

In Virginia, the Rise of a New Space Coast

AP (July 30, 2014) Every summer, tourists make the pilgrimage to Chincoteague Island, Va. to see wild ponies cross the Assateague Channel. But, it's the rockets sending to supplies to the International Space Station that are making this a year-round destination. (July 30) Video provided by AP
Powered by NewsLook.com
Climate Change Could Cost Billions, According To White House

Climate Change Could Cost Billions, According To White House

Newsy (July 29, 2014) A report from the White House warns not curbing greenhouse gas emissions could cost the U.S. billions. Video provided by Newsy
Powered by NewsLook.com
Climate Change Could Cost Billions According To White House

Climate Change Could Cost Billions According To White House

Newsy (July 29, 2014) A report from the White House warns not curbing greenhouse gas emissions could cost the U.S. billions. Video provided by Newsy
Powered by NewsLook.com
Jane Goodall Warns Great Apes Face Extinction

Jane Goodall Warns Great Apes Face Extinction

AFP (July 29, 2014) The world's great apes face extinction within decades, renowned chimpanzee expert Jane Goodall warned Tuesday in a call to arms to ensure man's closest relatives are not wiped out. Duration: 00:58 Video provided by AFP
Powered by NewsLook.com

Search ScienceDaily

Number of stories in archives: 140,361

Find with keyword(s):
Enter a keyword or phrase to search ScienceDaily for related topics and research stories.

Save/Print:
Share:

Breaking News:
from the past week

In Other News

... from NewsDaily.com

Science News

Health News

Environment News

Technology News



Save/Print:
Share:

Free Subscriptions


Get the latest science news with ScienceDaily's free email newsletters, updated daily and weekly. Or view hourly updated newsfeeds in your RSS reader:

Get Social & Mobile


Keep up to date with the latest news from ScienceDaily via social networks and mobile apps:

Have Feedback?


Tell us what you think of ScienceDaily -- we welcome both positive and negative comments. Have any problems using the site? Questions?
Mobile: iPhone Android Web
Follow: Facebook Twitter Google+
Subscribe: RSS Feeds Email Newsletters
Latest Headlines Health & Medicine Mind & Brain Space & Time Matter & Energy Computers & Math Plants & Animals Earth & Climate Fossils & Ruins