Abstract
Anamorphs of 22 strains of botryosphaeriaceous fungi including Fusicoccum spp., Diplodia spp., Sphaeropsis spp., and Lasiodiplodia theobromae (teleomorph = Botryosphaeria rhodina) were compared utilizing conidial characters, cultural morphology, growth rates and nucleotide sequences of the nuclear rDNA internal transcribed spacers ITS 1 and ITS 2. The ITS data shared consensus with morphological and cultural characters in separating 7 of the 22 strains. The 7 strains were placed into one of three groups that corresponded with the morphological species L. theobromae, S. sapinea, and F. luteum. Only partial consensus was achieved with the remaining 15 strains as ITS sometimes grouped together strains with uniform morphological and cultural characters and other times not. The ten Fusicoccum strains, identified as anamorphs of B. dothidea or B. ribis, were divided into two ITS groups and up to five groups based on traditional characters. The two putative B. ribis strains were consistently grouped together and appear to represent a stable variant of B. dothidea. Two morphologically indistinguishable Sphaeropsis sp. strains, identified as anamorphs of B. obtusa, were separated into two ITS groups, one containing all S. sapinea strains and the other containing Diplodia mutila (teleomorph = B. sievensit) and D. quercina. Conidial color, wall texture, septa number, size and shape as well as mycelial growth under different temperatures were consistent characters within some presumed morphological species, and within some ITS groups, but none of the characters were universally informative. Moreover, conidial pleomorphy and plasticity of some morphological and cultural characters posed problems for differentiating strains using traditional characters, particularly with Sphaeropsis and Diplodia form-genera. The possibility that the ITS region is not informative at the species level for some of the taxa evaluated is considered.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.