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Khanal M, Bhatta BP, Timilsina S, Ghimire S, Cochran K, Malla S. Curtobacterium allii sp. nov., the actinobacterial pathogen causing onion bulb rot. Antonie Van Leeuwenhoek 2023; 116:83-96. [PMID: 36100777 DOI: 10.1007/s10482-022-01775-z] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2022] [Accepted: 09/06/2022] [Indexed: 02/01/2023]
Abstract
A Gram-stain-positive, aerobic, and non-spore-forming bacterial strain, 20TX0166T, was isolated from a diseased onion bulb in Texas, USA. Upon testing its pathogenicity on onion bulb, it produced pathogenic response which makes it first species of pathogen belonging to the phylum actinobacteria detected in onion. Phylogenetic analysis of the 16S rRNA gene sequence revealed that the strain belonged to the genus Curtobacterium and was most similar to Curtobacterium flaccumfaciens LMG 3645T (100%), C. pusillum DSM 20527T (99.5%), and C. oceanosedimentum ATCC 31317T (99.5%). The estimated genome size of the novel species was 4.0 Mbp with a G + C content of 70.8%. The orthologous ANI (orthoANIu), ANI based on blast (ANIb), and dDDH values between the novel strain and the closest relative, C. flaccumfaciens LMG 3645T, were 95.7%, 95.4%, and 63.3%, respectively. These values were below the recommended species cut-off threshold of 96% (ANI) and 70% (dDDH), suggesting the strain may be a novel species. Physiologic and phenotypic characters of this novel strain were also unique when compared with the closely related species. The major cellular fatty acids of this strain were anteiso-C15:0 and anteiso-C17:0. Using a polyphasic approach based on phenotypic and genotypic analyses, strain 20TX0166T represents a novel species of the genus Curtobacterium, and the name Curtobacterium allii sp. nov. is proposed. The type strain is 20TX0166T (= LMG 32517T = CIP112023T = NCIMB 15427T).
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Affiliation(s)
- Manzeal Khanal
- Department of Horticultural Sciences, Texas A&M University, College Station, TX, 77843, USA.,Texas A&M AgriLife Research and Extension Centre, Uvalde, TX, 78801, USA
| | - Bed Prakash Bhatta
- Department of Horticultural Sciences, Texas A&M University, College Station, TX, 77843, USA.,Texas A&M AgriLife Research and Extension Centre, Uvalde, TX, 78801, USA
| | - Sujan Timilsina
- Department of Plant Pathology, University of Florida, Gainesville, FL, 32611, USA.,Charles River Laboratories, Newark, DE, USA
| | - Sudeep Ghimire
- Department of Pathology, University of Iowa, Iowa City, IA, 54442, USA
| | - Kimberly Cochran
- Texas A&M AgriLife Research and Extension Centre, Uvalde, TX, 78801, USA.,Department of Plant Pathology and Microbiology, Texas A&M University, College Station, TX, 77843, USA
| | - Subas Malla
- Department of Horticultural Sciences, Texas A&M University, College Station, TX, 77843, USA. .,Texas A&M AgriLife Research and Extension Centre, Uvalde, TX, 78801, USA.
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Wang W, Liu J, Mishra B, Mukhtar MS, McDowell JM. Sparking a sulfur war between plants and pathogens. TRENDS IN PLANT SCIENCE 2022; 27:1253-1265. [PMID: 36028431 DOI: 10.1016/j.tplants.2022.07.007] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/07/2021] [Revised: 07/03/2022] [Accepted: 07/21/2022] [Indexed: 06/15/2023]
Abstract
The biochemical versatility of sulfur (S) lends itself to myriad roles in plant-pathogen interactions. This review evaluates the current understanding of mechanisms by which pathogens acquire S from their plant hosts and highlights new evidence that plants can limit S availability during the immune responses. We discuss the discovery of host disease-susceptibility genes related to S that can be genetically manipulated to create new crop resistance. Finally, we summarize future research challenges and propose a research agenda that leverages systems biology approaches for a holistic understanding of this important element's diverse roles in plant disease resistance and susceptibility.
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Affiliation(s)
- Wei Wang
- School of Plant and Environmental Sciences, Virginia Tech, Blacksburg, VA 24061, USA
| | - Jinbao Liu
- Department of Biology, University of Alabama-Birmingham, Birmingham, AL 35294, USA
| | - Bharat Mishra
- Department of Biology, University of Alabama-Birmingham, Birmingham, AL 35294, USA
| | - M Shahid Mukhtar
- Department of Biology, University of Alabama-Birmingham, Birmingham, AL 35294, USA
| | - John M McDowell
- School of Plant and Environmental Sciences, Virginia Tech, Blacksburg, VA 24061, USA.
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