Featured Research

from universities, journals, and other organizations

High Protein Yam Bean: A Nearly Forgotten Crop

Date:
September 20, 2007
Source:
American Society of Agronomy
Summary:
Researchers discovered a variation of the yam bean with less water content and high in protein. This could fulfill the need of a more stable crop and food source in sub-Saharan and west Africa where root crops are a major source of nourishment.

This small bean has great potential to provide high quality food production and offer a sustainable cropping system that has been needed in Africa.
Credit: Wolfgang Gruneberg

The Yam bean originated where the Andes meet the Amazon and is locally grown in South and Central America, South Asia, East Asia and the Pacific. It is produced in three species which are called the Amazonian, Mexican and Andean.

Interbreeding of the bean has resulted in fertile and stable hybrids. This gives it potential to be reclassified as a single species, provide high quality food production and offer a sustainable cropping system that has been needed in Africa.

Researchers believe they have discovered a protein-rich starch staple in the yam bean in Peru. They were previously considered a root vegetable due to the high water content; however this 'Chuin' type has lower water content. Families living in the area have been producing it as flour. The crop has extremely high seed production, but its seeds contain high concentrations of rotenone.

This toxic compound has been used for reducing fish populations and parasitic mites on poultry. Seeds are never consumed since they are mildly toxic to humans and other mammals. If the rotenone was removed from the seeds, they could provide a strong protein source as well as seed oil profitable in the food industry.

Sιraphin Zanklan, a scientist at Centre Songhai in Porto-Novo (Benin), has investigated the yam bean for its potential to grow and produce food under West African conditions. The study was funded by a scholarship from the German Academic Exchange Service (DAAD). Thirty-four yam genotypes were grown with and without flower removal at one droughty location and one irrigated location. Of the 33 traits that were measured, nearly all showed large genetic variation. This and the easy spreading of its seeds, make the crops very desirable to breeders. Results from the study will be published in the July-August 2007 issue of Crop Science.

The study identified genotypes with high storage root production. Flower removal increased storage root production by 50 to 100%. Several yam bean genotypes showed very low reduction in storage root and seed production under drought stressed conditions. As expected, the storage roots did show high protein and starch contents. They have as much as three to five times more protein than potatoes or yams. Most importantly, it was found that storage roots can be processed into 'yam bean gari.' This is similar to the current staple of West Africa, 'cassava gari,' a granular flour.

The bean could make a significant contribution to the improvement of food support, especially where resources are poor. The research is ongoing at the International Potato Center, which has a mandate for the bean in the frame of Andean Root and Tuber Crops. Further evaluation is needed on the range of yam bean variations under different conditions. More information on where they can be grown, their agronomic potential and genetic diversity is important to determine the types of breeding programs necessary for yam beans.


Story Source:

The above story is based on materials provided by American Society of Agronomy. Note: Materials may be edited for content and length.


Cite This Page:

American Society of Agronomy. "High Protein Yam Bean: A Nearly Forgotten Crop." ScienceDaily. ScienceDaily, 20 September 2007. <www.sciencedaily.com/releases/2007/09/070915081441.htm>.
American Society of Agronomy. (2007, September 20). High Protein Yam Bean: A Nearly Forgotten Crop. ScienceDaily. Retrieved September 23, 2014 from www.sciencedaily.com/releases/2007/09/070915081441.htm
American Society of Agronomy. "High Protein Yam Bean: A Nearly Forgotten Crop." ScienceDaily. www.sciencedaily.com/releases/2007/09/070915081441.htm (accessed September 23, 2014).

Share This



More Plants & Animals News

Tuesday, September 23, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Raw: Ice Age Wooly Mammoth Remains for Sale

Raw: Ice Age Wooly Mammoth Remains for Sale

AP (Sep. 23, 2014) — A rare, well-preserved skeleton of a woolly mammoth is going on sale at Summers Place Auctions hope the 11.5-foot tall, almost intact specimen will fetch between $245,000 to $409,000. (Sept. 23) Video provided by AP
Powered by NewsLook.com
Fox Bites Conn. Student And School Staffers In Rare Attack

Fox Bites Conn. Student And School Staffers In Rare Attack

Newsy (Sep. 23, 2014) — A fox attacked a second-grade boy at a Connecticut elementary school Monday. It also attacked two school staff members and a woman and her dog. Video provided by Newsy
Powered by NewsLook.com
Will Living Glue Be A Thing?

Will Living Glue Be A Thing?

Newsy (Sep. 23, 2014) — Using proteins derived from mussels, engineers at MIT have made a supersticky underwater adhesive. They're now looking to make "living glue." Video provided by Newsy
Powered by NewsLook.com
Raw: Tiger Kills Man at India Zoo

Raw: Tiger Kills Man at India Zoo

AP (Sep. 23, 2014) — A white tiger killed a young man who climbed over a fence at the New Delhi zoo and jumped into the animal's enclosure on Tuesday, a spokesman said. (Sept. 23) 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