Characterization and Pathogenicity of Alternaria burnsii from Seeds of Cucurbita maxima (Cucurbitaceae) in Bangladesh

Mycobiology
Narayan Chandra PaulSeung-Hun Yu

Abstract

In the course of survey of endophytic fungi from Bangladesh pumpkin seeds in 2011~2012, two strains (CNU111042 and CNU111043) with similar colony characteristics were isolated and characterized by their morphology and by molecular phylogenetic analysis of the internal transcribed spacer, glyceraldehydes-3-phosphate dehydrogenase (gpd), and Alternaria allergen a1 (Alt a1) sequences. Phylogenetic analysis of all three sequences and their combined dataset revealed that the fungus formed a subclade within the A. alternata clade, matching A. burnsi and showing differences with its other closely related Alternaria species, such as A. longipes, A. tomato, and A. tomaticola. Long ellipsoid, obclavate or ovoid beakless conidia, shorter and thinner conidial size (16~60 [90] × 6.5~14 [~16] µm) distinguish this fungus from other related species. These isolates showed more transverse septation (2~11) and less longitudinal septation (0~3) than did other related species. Moreover, the isolate did not produce any diffusible pigment on media. Therefore, our results reveal that the newly recorded fungus from a new host, Cucurbita maxima, is Alternaria burnsii Uppal, Patel & Kamat.

References

Mar 25, 1971·Mycopathologia et mycologia applicata·V G Rao
Jan 27, 2005·Fungal Genetics and Biology : FG & B·Soon Gyu HongBarry M Pryor
Jul 1, 2003·Molecular Plant Pathology·Bart P H J Thomma

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Citations

Sep 30, 2020·Plant Disease·Zhonghong FengGuangyu Sun

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Datasets Mentioned

BETA
CNU111043
EML111042
EML111043

Methods Mentioned

BETA
PCR

Software Mentioned

BioEdit
BLAST
CLUSTAL X
MEGA

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