Featured Research

from universities, journals, and other organizations

Researchers Determine Genetic Origin Of California Wild Radish

Date:
July 19, 2006
Source:
University of California - Riverside
Summary:
UC Riverside scientists studying the genetic makeup of wild radishes in California have determined that the California wild radish is descended from hybrids between two species: cultivated radish and the weed, jointed charlock. The hybrid-derived plants apparently have completely eliminated the ancestral species from California.

The California wild radish is descended from hybrids between two species: cultivated radish and the weed, jointed charlock.
Credit: S. Hegde, UCR

University of California, Riverside scientists studying the genetic makeup of wild radishes in California have determined that the California wild radish is descended from hybrids between two species: cultivated radish and the weed, jointed charlock. The hybrid-derived plants apparently have completely eliminated the ancestral species from California, the researchers report.

Related Articles


The discovery is significant because the parental species were replaced by a single, stable hybrid lineage in less than 100 years, an extremely short interval in evolution.

The researchers published their findings in the June issue of Evolution. Next week's issue of the journal Nature highlights their research.

"The documented instances of extinction by hybridization in which both parents are replaced by the hybrid are rare," said Subray G. Hegde, the lead author of the paper and a postgraduate research geneticist who, in 2001, joined the research group of Norman C. Ellstrand, professor of genetics in UCR's Department of Botany and Plant Sciences. "What we've shown is that the extinction of a species by this process can occur very rapidly. We need to recognize the lesson this teaches us for conservation: if we are to save organisms from extinction, we need to make sound decisions fast."

Both the cultivated radish and jointed charlock were introduced to California more than 100 years ago. While the cultivated variety, found in grocery stores, bears pink, purple and white flowers and has a swollen root, the weed bears yellow flowers (occasionally also white) and has a slender root.

California wild radish is a genetic fusion of the cultivated and weedy varieties, thriving along California's coast as well as in the inland valley. Bearing a mixture of white, purple, pink, bronze and yellow flowers, all of the plants are uniformly intermediate between the cultivated radish and jointed charlock in root size and shape. Its fruit size is intermediate also. Suggested as a hybrid lineage by UC Berkeley scientists in the 1960s, the UCR-led research now reports definitive genetic evidence for its hybrid origin.

In their research, the UCR scientists performed an extensive survey of wild radishes throughout California, cultivated radish varieties, and samples of jointed charlock from outside of California. After doing a morphological study of the three types of plants, they performed modern population genetic analysis, using a sophisticated analytical tool developed in the last five years to determine the radishes' genetic makeup.

"We found that wild radish in California has now become an evolutionary entity separate from both of its parents," said Ellstrand, a co-author of the paper. "It can serve as an excellent model organism for evolutionary studies."

Hegde noted that the California wild radish has spread fast in the state, where, unlike its parents, it has become invasive. Next in their research the scientists will look for a genetic explanation for how the hybrid acquired its invasive behavior. Said Hegde, "This approach could help us find a way to control the spread of other plants that evolved invasiveness after interspecies hybridization."

Along with Hegde and Ellstrand, researchers on the study were UCR's Janet M. Clegg and Iowa State University's John D. Nason. Nason received his Ph.D. in botany from UCR in 1991. The study was funded by the Agricultural Experiment Station at UCR.


Story Source:

The above story is based on materials provided by University of California - Riverside. Note: Materials may be edited for content and length.


Cite This Page:

University of California - Riverside. "Researchers Determine Genetic Origin Of California Wild Radish." ScienceDaily. ScienceDaily, 19 July 2006. <www.sciencedaily.com/releases/2006/07/060713233418.htm>.
University of California - Riverside. (2006, July 19). Researchers Determine Genetic Origin Of California Wild Radish. ScienceDaily. Retrieved March 27, 2015 from www.sciencedaily.com/releases/2006/07/060713233418.htm
University of California - Riverside. "Researchers Determine Genetic Origin Of California Wild Radish." ScienceDaily. www.sciencedaily.com/releases/2006/07/060713233418.htm (accessed March 27, 2015).

Share This


More From ScienceDaily



More Plants & Animals News

Friday, March 27, 2015

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Jockey Motion Tracking Reveals Racing Prowess

Jockey Motion Tracking Reveals Racing Prowess

Reuters - Innovations Video Online (Mar. 26, 2015) Using motion tracking technology, researchers from the Royal Veterinary College (RVC) are trying to establish an optimum horse riding style to train junior jockeys, as well as enhance safety, health and well-being of both racehorses and jockeys. Matthew Stock reports. Video provided by Reuters
Powered by NewsLook.com
Botswana Talks to End Illegal Wildlife Trade

Botswana Talks to End Illegal Wildlife Trade

AFP (Mar. 25, 2015) Experts are gathering in Botswana to try to end the illegal wildlife trade that is decimating populations of elephants, rhinos and other threatened species. Duration: 01:05 Video provided by AFP
Powered by NewsLook.com
Elephants Help Keep 18-Wheeler From Toppling Over

Elephants Help Keep 18-Wheeler From Toppling Over

Newsy (Mar. 25, 2015) The Natchitoches Parish Sheriff&apos;s Office discovered two elephants keeping a tractor-trailer that had gotten stuck in some mud upright on a highway. Video provided by Newsy
Powered by NewsLook.com
Baby 'pet' Orangutan Rescued from Chicken Cage Takes First Steps

Baby 'pet' Orangutan Rescued from Chicken Cage Takes First Steps

Reuters - Light News Video Online (Mar. 25, 2015) Buti, a baby orangutan who was left malnourished in a chicken cage before his rescue, takes his first steps after months of painful physical therapy. Mana Rabiee reports. Video provided by Reuters
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:

Strange & Offbeat Stories


Plants & Animals

Earth & Climate

Fossils & Ruins

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