Imperata yellow mottle virus: An Emerging Threat to Maize, Sorghum and Pearl Millet in Burkina Faso
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Date
2017-05Author
Koala, Moustapha
Traoré, Valentin Stanislas Edgar
Sérémé, Drissa
Neya, Bouma James
Brugidou, Christophe
Barro, Nicolas
Traoré, Oumar
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Show full item recordAbstract
Imperata yellow mottle caused by Imperata yellow mottle virus (IYMV) of the
genus Sobemovirus was first characterized on Imperata cylindrica and Zea
mays in Burkina Faso. The disease has been reported in several localities of
the country but its ecology and epidemiology are poorly known. In particular,
only I. cylindrica and maize have been reported within IYMV host range. The
aim of this study was to investigate the experimental host range of the virus.
Mechanical inoculation of a mixture of four IYMV isolates to 18 plant species,
including four crops (maize, rice, sorghum and pearl millet) and 14 wild
grasses showed clear mottle symptoms in maize, sorghum and pearl millet
and two wild grass species (Setaria verticillata and Rottboellia exaltata). Symptom
development was confirmed by Enzyme-linked immunosorbent assay
and reverse transcription–polymerase chain reaction (RT-PCR). Infection of
crop species by IYMV depended on cultivars tested. Therefore, proportions of
positive cultivars were 16/36 in maize, 4/10 in sorghum and 4/9 in pearl millet,
respectively. Studies on virus-host interactions using individual virus isolates
showed two pathogenic patterns. Three out of the four isolates tested infected
all plant species and cultivars. In contrast, the fourth IYMV isolate
could infect only one maize cultivar. These results expand the previously
known host range of IYMV from two to five species, indicating a narrow host
range. Among the new characterized host species, sorghum and pearl millet
are important cereal crops. Therefore, Imperata yellow motte disease is a potential
threat for the cereal crop production and its ecology and epidemiology
should be thoroughly investigated.
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- Agriculture [96]