Flooding-Associated Soft Rot of Sweetpotato Storage Roots Caused by Distinct Clostridium Isolates

Author:

da Silva Washington L.12ORCID,Yang Kuei-Ting3,Pettis Gregg S.13ORCID,Soares Natasha R.3,Giorno Rebecca4,Clark Christopher A.1ORCID

Affiliation:

1. Department of Plant Pathology and Crop Physiology, Louisiana State University Agricultural Center, Baton Rouge, LA 70803

2. The Connecticut Agricultural Experiment Station, Department of Plant Pathology and Ecology, New Haven, CT 06511

3. Department of Biological Sciences, Louisiana State University, Baton Rouge, LA 70803

4. School of Biological Sciences, Louisiana Tech University, Ruston, LA 71272

Abstract

Flooding of sweetpotatoes in the field leads to development of soft rot on the storage roots while they remain submerged or on subsequent harvest and storage. Incidences of flooding after periods of intense rainy weather are on the rise in the southeastern United States, which is home to the majority of sweetpotato production in the nation. In an effort to characterize the causative agent(s) of this devastating disease, here we describe two distinct bacterial strains isolated from soft-rotted sweetpotato storage roots retrieved from an intentionally flooded field. Both of these anaerobic spore-forming isolates were identified as members of the genus Clostridium based on sequence similarity of multiple housekeeping genes, and both were confirmed to cause soft rot disease on sweetpotato and other vegetable crops. Despite these common features, the isolates were distinguishable by several phenotypic and biochemical properties, and phylogenetic analysis placed them in separate well-supported clades within the genus. Overall, our results demonstrate that multiple plant-pathogenic Clostridium species can cause soft rot disease on sweetpotato and suggest that a variety of other plant hosts may also be susceptible.

Funder

National Institute of Food and Agriculture

Louisiana Board of Regents

Publisher

Scientific Societies

Subject

Plant Science,Agronomy and Crop Science

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