Featured Research

from universities, journals, and other organizations

Scientists Re-Examine Soy Bean Diversity

Date:
December 1, 2007
Source:
US Department of Agriculture
Summary:
Scientists have now challenged the widely held assumption that two "genetic bottlenecks" have drastically reduced genetic variability in soybean varieties grown in farmers' fields. The first bottleneck was said to be plant breeders' tendency to use only a few parent soybeans from Asia, called "landraces," to build the genetic base of U.S. soybean in the 1930s and 1940s. The second bottleneck was breeders' use of a small group of elite varieties as parents in each succeeding round of breeding during the past 60 years.

Geneticist David Hyten harvests leaf tissue from one of many plant progenies derived from the cross of the soybean cultivar Williams 82 with a wild soybean. The leaf tissue will be stored at -80˚C and will be used to isolate DNA for further studies.
Credit: Photo by Peggy Greb

An Agricultural Research Service (ARS)-led team of scientists has challenged the widely held assumption that two "genetic bottlenecks" have drastically reduced genetic variability in soybean varieties grown in farmers' fields.

Related Articles


The first bottleneck was said to be plant breeders' tendency to use only a few parent soybeans from Asia, called "landraces," to build the genetic base of U.S. soybean in the 1930s and 1940s. The second bottleneck was breeders' use of a small group of elite varieties as parents in each succeeding round of breeding during the past 60 years.

However, in a November 2006 paper published in the Proceedings of the National Academy of Sciences, a team led by ARS geneticists Perry Cregan and David Hyten argues that this isn't the case, based on their analysis of alternate gene forms, called alleles, from four major soybean groups. These included 26 samples of wild soybean, Glycine soja; 52 Asian landraces; 17 landrace "founders" used to establish America's soy crop; and 25 elite cultivars.

According to Cregan and Hyten, with the ARS Soybean Genomics and Improvement Laboratory at Beltsville, Md., their results indicate only a small proportion of the landraces' diversity was lost following their introduction from Asia and subsequent years of intensive plant breeding. Rather, the limited diversity stems from the inherently low diversity in wild soybean and further loss related to its domestication thousands of years ago in Asia.

Cregan and Hyten agree that ensuring genetic variability in soybean is critical to protecting the crop from new disease and insect pests. However, they emphasize the importance of anticipating an exotic pest's or pathogen's eventual U.S. arrival, and conducting searches for resistance genes in the ARS Soybean Germplasm Collection at Urbana, Ill. Such genes could then be bred into America's elite cultivars well before an outbreak of that pest or pathogen. Cregan and Hyten's collaborators include scientists from two other ARS labs, the University of Maryland, and the University of Nebraska.


Story Source:

The above story is based on materials provided by US Department of Agriculture. Note: Materials may be edited for content and length.


Cite This Page:

US Department of Agriculture. "Scientists Re-Examine Soy Bean Diversity." ScienceDaily. ScienceDaily, 1 December 2007. <www.sciencedaily.com/releases/2007/11/071126154542.htm>.
US Department of Agriculture. (2007, December 1). Scientists Re-Examine Soy Bean Diversity. ScienceDaily. Retrieved November 22, 2014 from www.sciencedaily.com/releases/2007/11/071126154542.htm
US Department of Agriculture. "Scientists Re-Examine Soy Bean Diversity." ScienceDaily. www.sciencedaily.com/releases/2007/11/071126154542.htm (accessed November 22, 2014).

Share This


More From ScienceDaily



More Plants & Animals News

Saturday, November 22, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Anglerfish Rarely Seen In Its Habitat Will Haunt You

Anglerfish Rarely Seen In Its Habitat Will Haunt You

Newsy (Nov. 22, 2014) For the first time Monterey Bay Aquarium recorded a video of the elusive, creepy and rarely seen anglerfish. Video provided by Newsy
Powered by NewsLook.com
Birds Around the World Take Flight

Birds Around the World Take Flight

Reuters - Light News Video Online (Nov. 22, 2014) An imperial eagle equipped with a camera spreads its wings over London. It's just one of the many birds making headlines in this week's "animal roundup". Jillian Kitchener reports. Video provided by Reuters
Powered by NewsLook.com
Could Your Genes Be The Reason You're Single?

Could Your Genes Be The Reason You're Single?

Newsy (Nov. 21, 2014) Researchers in Beijing discovered a gene called 5-HTA1, and carriers are reportedly 20 percent more likely to be single. Video provided by Newsy
Powered by NewsLook.com
Raw: Baby Okapi Born at Houston Zoo

Raw: Baby Okapi Born at Houston Zoo

AP (Nov. 20, 2014) The Houston Zoo released video of a male baby okapi. Okapis, also known as the "forest giraffe", are native to the Democratic Republic of the Congo in Central Africa. Video is mute from source. (Nov. 20) Video provided by AP
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