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First report of bacterial leaf blight of rice caused by Xanthomonas oryzae pv. oryzae in Benin.

Afolabi, O. ; Amoussa, R. ; Bilé, M. ; Oludare, A. ; Gbogbo, V. ; Poulin, L. ; Koebnik, R. ; Szurek, B. ; Silué, D.

Plant Disease 2016 Vol 100 No. 2 pp. 515;

Abstract

In May 2013, bacterial leaf blight-like symptoms were observed on wild rice Oryza longistaminata plants near Tanguiéta town, near Pendjari National Park, northwest Benin. Symptoms included water-soaked stripes below the leaf tip and on leaf margins. The stripes occasionally enlarged and turned yellow and the most severely affected leaves became greyish-brown with yellow margins on one or both sides of leaves. Based on the results of PCR assay, morphological observations, DNA sequence analysis of the gyrB gene and pathogenicity tests, the causal agent (isolate ABB1) was identified as Xanthomonas oryzae pv. oryzae. In 2013, new samples were collected during the rainy (July) and dry (November) seasons from different host plants including rice (Oryza sativa and O. glaberrima) and wild rice (O. longistaminata) around the site where ABB1 originated. While all samples collected in July were negative in multiplex PCR assays, those collected in November from wild rice (O. longistaminata) led to the isolation of ABB40 and ABB41 that were confirmed as X. oryzae pv. oryzae by multiplex PCR assay and gyrB sequencing. This is thought to be the first report of bacterial leaf blight of rice caused by X. oryzae pv. oryzae in Benin.