New ARS-Developed Soybean Line Resists Key
December 31, 2009
A new soybean line developed by
Agricultural Research Service (ARS)
scientists is good news for growers. The line, JTN-5109, is effective against
the most virulent soybean cyst nematode, called LY1.
The soybean cyst nematode is a pervasive soybean pest worldwide. In the
United States, the nematode is the most damaging soybean pest, causing an
estimated yield loss of nearly 94 million bushels in 2007. Genetic resistance
has been the most effective means of controlling the pest.
Nearly all nematode-resistant soybean varieties currently available contain
resistance genes from one of two sourcessoybean lines Peking
or Plant Introduction (PI) 88788. JTN-5109, however, has combined nematode
resistance from three sourcesPeking, PI 437654 and PI
JTN-5109 is the latest soybean line developed by geneticist
Arelli and his team at the ARS
Genetics Research Unit's satellite laboratory in Jackson, Tenn. The soybean
was developed using a combination of traditional plant breeding and genetic
marker-assisted selection. Arelli discussed the research at a meeting of the
American Society of Agronomy and the
Crop Science Society of America in
Nematode populations are genetically variable and have adapted to reproduce
on resistant soybean cultivars over time. And in recent years, the LY1 nematode
populations were found in Missouri, Illinois and Tennessee.
JTN-5109 provided yields of 26 bushels per acre in field studies conducted
in 2008 at Jackson, Tenn., and Ames
Plantation near Grand Junction, Tenn. That yield is not far below the 29
bushels per acre produced by 5601T, which is a commonly used cultivar, but one
susceptible to LY1. The JTN-5109 line will be an excellent source material for
breeding high-yielding soybeans with resistance to nematodes, especially for
the LY1 nematode population.
Arelli collaborated with scientists at the University of Tennessee,
Michigan State University,
Iowa State University, and the
University of Missouri, as well as the
ARS Corn and
Soybean Research Unit at Wooster, Ohio, on the project.
ARS is the chief intramural scientific research agency of the
U.S. Department of Agriculture (USDA). This
research supports the USDA priority of promoting international food security.