Billard Estelle, Bangratz Martine, Kassankogno A. I., Saengram Phonsiri, Guigma A. K., Cotto O., Thébaud G., Wonni I., Sérémé D., Poulicard Nils, Cunnac Sébastien, Hutin Mathilde, Hébrard Eugénie, Tollenaere Charlotte. (2025). Co-circulation of viral and bacterial diseases in the field : insights from symptom observation and detection of two rice pathogens. European Journal of Plant Pathology, [Early access], p. [7 p.]. ISSN 0929-1873.
Titre du document
Co-circulation of viral and bacterial diseases in the field : insights from symptom observation and detection of two rice pathogens
Année de publication
2025
Auteurs
Billard Estelle, Bangratz Martine, Kassankogno A. I., Saengram Phonsiri, Guigma A. K., Cotto O., Thébaud G., Wonni I., Sérémé D., Poulicard Nils, Cunnac Sébastien, Hutin Mathilde, Hébrard Eugénie, Tollenaere Charlotte
Source
European Journal of Plant Pathology, 2025,
[Early access], p. [7 p.] ISSN 0929-1873
Co-occurrence of multiple diseases and co-infection of individual plants by various pathogens have potential epidemiological implications. Based on data on the co-occurrence of the rice yellow mottle disease (caused by the rice yellow mottle virus, RYMV) and bacterial leaf streak (BLS, due to Xanthomonas oryzae pv. oryzicola, Xoc) in Burkina Faso, and experimental evidence of interactions between the pathogens causing these two diseases, we monitored the two pathogens more intensively in farmer's rice fields. We selected fields showing both types of symptoms to maximize chances of observing co-infections at the plant scale. We performed observations and sampling in two sites over two consecutive years, resulting in 1666 samples. 1341 plants were symptomatic for any of the two diseases. Although the sampling design was biased towards observing co-infections, only 37 of these samples (2.8%) were annotated as presenting both yellow mottle and BLS symptoms. The samples were then subjected to a newly designed molecular detection test that specifically amplifies both the virus (RYMV) and the bacteria (Xo). This revealed that 166 samples, i.e. 12.4% of the symptomatic samples, were co-infected by RYMV and Xo, hence showing that symptom observation in the field greatly underestimated co-infection levels in this dataset. Combining these data with a previously published dataset, we estimated that at least 1-5% of all plants in disease hotspots may be simultaneously infected by the two pathogens. Further research on multiple infections would benefit from longitudinal surveys over the growing season rather than such a cross-sectional study.
Plan de classement
Sciences du monde végétal [076]
Localisation
Fonds IRD [F B010095412]
Identifiant IRD
fdi:010095412
