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Document Type:Latin Dissertation
Language of Document:English
Record Number:54811
Doc. No:TL24765
Call number:‭3425515‬
Main Entry:Linley Joy Smith
Title & Author:Host range, phylogenetic, and pathogenic diversity of Corynespora cassiicola (Berk. & Curt.) WeiLinley Joy Smith
College:University of Florida
Date:2008
Degree:Ph.D.
student score:2008
Page No:103
Abstract:The fungus Corynespora cassiicola (Berk. & Curt.) Wei is a pathogen, endophyte, and saprophyte. It can be found growing on at least 530 plant species from 380 genera, primarily in the tropics. Isolates from diverse hosts were collected or solicited from locations in American Samoa, Brazil, Malaysia, Micronesia, and Florida, Mississippi, and Tennessee within the United States. Outgroup taxa including C. citricola, C. melongenea, C. olivaceae, C. proliferata, C. sesamum, and C. smithii were solicited from culture collections. A multilocus phylogenetic analysis using 143 isolates was performed to investigate how genetic diversity correlates with host-specificity, growth rate, and geographic distribution. Phylogenetic trees were congruent from the rDNA ITS region, two random hypervariable loci ( Cs caa5 and Cs ga4 ), and the actin encoding locus CC act1, indicating asexual propagation. Fifty isolates had different pathogenicity profiles when tested against eight known C. cassiicola hosts: basil, bean, cowpea, cucumber, papaya, soybean, sweet potato, and tomato. Phylogenetic lineage correlated with pathogenicity profiles, host originality, and growth rate, but not with geographic location. Common fungal genotypes were widely distributed geographically indicating long distance and global dispersal of clonal lineages. This research reveals an abundance of previously unrecognized diversity within the species and provides evidence for redefining species distinctions within Corynespora, which will aid in future disease control strategies.
Subject:Biological sciences; Corynespora cassiicola; Target spot; Tomato diseases; Plant species; Host diversity; Plant biology; Ecology; Plant Pathology; 0309:Plant biology; 0329:Ecology; 0480:Plant Pathology
Added Entry:L. Datnoff
Added Entry:University of Florida