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ARS Home » Midwest Area » Urbana, Illinois » Soybean/maize Germplasm, Pathology, and Genetics Research » Research » Publications at this Location » Publication #92143
Title: PATHOGENICITY OF FUSARIUM SOLANI F. SP. GLYCINES ISOLATES ON SOYBEAN AND GREEN BEAN PLANTS

Author
item Gray, Lynn
item ACHENBACH, LAURIE - SOUTHERN IL UNIV
item DUFF, RICHARD - SOUTHERN IL UNIV
item LIGHTFOOT, DAVID - SOUTHERN IL UNIV

Submitted to: Plant Pathology
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: 8/3/1998
Publication Date: N/A
Citation: N/A

Interpretive Summary: Soybean sudden death syndrome is an important soybean disease caused by a Fusarium fungus that will infect and cause a disease. There are reports that green bean plants could be a possible host for this fungus. In the present work, soil was collected from a soybean field in southern Illinois in the fall of 1996. Soybean and green bean plants were planted in this soil in a greenhouse and isolations were made from tap root tissue of green bean plants. The Fusarium fungus was recovered from tap root tissue of green bean plants. Individuals (called isolates) of the Fusarium fungus were then used to reinoculate green bean plants in the greenhouse. From these studies it was found that the Fusarium fungus infected green bean plants and rotted the tap roots of inoculated plants. Several molecular techniques were used to compare DNA samples of the Fusarium isolates to known SDS isolates of Fusarium. The DNA molecular data showed that the Fusarium isolates recovered from green bean plants were identical to known SDS Fusarium isolates. These results confirm that green bean plants are a host for the SDS Fusarium fungus. Since green beans are grown in certain fields where soybeans are planted the next season, the Fusarium fungus can survive and build up in the soil to infect the soybean crop. This information is of use to soybean plant pathologists that are working on soybean and green bean root disease problems.

Technical Abstract: Green bean plants were grown in a greenhouse in soil removed from a soybean field in 1996 that had a high incidence of soybean sudden death syndrome (SDS). Over a 4-week period, isolations were made from taproot tissue of green bean plants to recover Fusarium isolates. Ten isolates of Fusarium solani were recovered and used to inoculate soybean and green bean plants in the greenhouse. These ten isolates caused typical SDS symptoms on soybean plants and caused a root and crown rot on green bean plants. Green bean plants did not develop typical symptoms associated with soybean SDS but, rather, leaves on infected plants showed yellowing and necrosis. Molecular data indicated that these ten isolates were identical to Fusarium solani f. sp. glycines that cause soybean sudden death syndrome. All isolates were reisolated from greenhouse inoculated soybean and green bean plants.