First Report of the Occurrence of a White Smut Infecting Rice in Arkansas

False smut has recently emerged as an important disease of rice in Arkansas. In 2011, 2012 and 2013, spore balls of a white smut similar to the spore balls of false smut were observed in rice fields in eastern Arkansas. As a white false smut was previously reported in China and Japan, we examined th...

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Bibliographic Details
Published in:Journal of phytopathology 2015-02, Vol.163 (2), p.138-143
Main Authors: Jecmen, Andrew C, TeBeest, David O
Format: Article
Language:English
Subjects:
Arkansas
chlamydospores
conidia
cultivars
etiological agents
nucleotide sequences
Oryza sativa
paddies
ribosomal DNA
rice
United States
Ustilaginoidea albicans
Ustilaginoidea virens
virulence
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Summary:False smut has recently emerged as an important disease of rice in Arkansas. In 2011, 2012 and 2013, spore balls of a white smut similar to the spore balls of false smut were observed in rice fields in eastern Arkansas. As a white false smut was previously reported in China and Japan, we examined the morphology of chlamydospores and spore balls from some of the infected heads and used selected regions of the rDNA to determine the identity of the causal agent of the disease. We also tested the virulence of an isolate of the white smut to two rice cultivars commonly grown in Arkansas. Our results indicate that the morphology of the spore balls, chlamydospores and conidia is similar to those reported for Ustilaginoidea albicans. However, sequences of ribosomal DNA amplicons indicate a high degree of similarity with both U. virens and U. albicans. The isolate of the white smut was virulent to two rice cultivars, producing spore balls similar to those observed in the field and to those previously described for U. albicans.
ISSN:0931-1785
1439-0434
DOI:10.1111/jph.12263