Submitted to: Journal of Nematology
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: February 20, 2003
Publication Date: March 15, 2003
Citation: SMITH, J.R., YOUNG, L.D. HOST SUITABILITY OF DIVERSE LINES OF PHASEOLUS VULGARIS TO MULTIPLE POPULATIONS OF HETERODERA GLYCINES. JOURNAL OF NEMATOLOGY. 2003. vol. 35(1). p. 23-28 Interpretive Summary: Soybean cyst nematode is the most destructive pathogen of soybean in the world. A large portion of U.S. soybean acreage is infested with soybean cyst nematode. Some common bean varieties are also good hosts for soybean cyst nematode and soybean and common bean acreage overlap in Michigan, Illinois, Wisconsin, North Dakota, and possibly other areas. However, the effect of a majority of the biotypes of soybean cyst nematode on the breadth of genetic diversity of common bean is not known. This study demonstrated that there is a diversity of responses of common bean to the diversity of biotypes of soybean cyst nematode. Some common bean varieties were resistant to all tested biotypes of soybean cyst nematode, while other common bean varieties were susceptible to some biotypes and resistant to others. Some common bean varieties can increase the number of nematodes in the soil by as much a 900% in as little as 40 days. This study will benefit tscientists and farmers who grow soybean in areas that overlap with common bean production. These individuals will want to exercise caution, by first conducting appropriate soil nematode assays when planting soybean in ground previously planted to common bean.
Technical Abstract: The host suitability of diverse races and gene pools of common bean (Phaseolus vulgaris L.) for multiple populations of Heterodera glycines (soybean cyst nematode) was studied. Twenty P. vulgaris genotypes, representing three of the six races within the two major common bean germplasm pools, were tested in greenhouse experiments to determine their host suitability to five H. glycines populations. P. vulgaris genotypes differed in their host suitability to different H. glycines populations. While some common bean lines were excellent hosts for some H. glycines populations, no common bean line was a good host for all populations. Some bean lines from races Durango and Mesoamerica, representing the Middle America gene pool, were resistant to all five nematode populations. Other lines, from the Andean and Middle America gene pools, had differential responses for host suitability to the different populations of H. glycines. .Andean genotypes 'G122' and 'Contender' demonstrated the ability to increase nematode population densities of the Puerto Rico race-2 population over initial levels, while other common bean lines did not.