Identification and pathogenicity of Fusarium species associated with sesame (Sesamum indicum L.) seeds from the Punjab, Pakistan

• Published in: Physiological and molecular plant pathology 2018-04, Vol.102, p.128-135
• Main Authors: Nayyar, Brian Gagosh, Woodward, Steve, Mur, Luis A.J., Akram, Abida, Arshad, Muhammad, Naqvi, S.M. Saqlan, Akhund, Shaista
• Format: Article
• Language: English
• Subjects: Blotter paper method; Fusarium; ITS; Sesame; TEF-1α
• ISSN: 0885-5765; 1096-1178
• DOI: 10.1016/j.pmpp.2018.02.001

Sesame (Sesamum indicum) is an oil-crop in Asia and Africa and is widely grown in the Punjab region of Pakistan. A total of 105 sesame seed samples were collected from different locations in the Punjab from which 520 isolates of Fusarium spp. were recovered. These isolates were initially grouped and identified based on morphological characteristics. The identities of representatives of the three most frequently isolated groups (strains designated F01, F98, F153) were identified as Fusarium proliferatum, on the basis of the sequencing of ITS of rDNA and translation elongation factor (TEF-1α) gene regions. Phylogenetic trees generated using the maximum likelihood method showed that these three isolates and a F. proliferatum reference sequence grouped in the same clade with F. phyllophilum, the most closely related species. Pathogenicity tests demonstrated that these three isolates caused disease on sesame plants. Disease Incidence (DI) and Disease Severity Index (DSI) data indicated that F01 was the most virulent isolate, with DI and DSI of approximately 70%. Culture filtrates of F01 reduced sesame seed germination (to 40%) and vigor (to 16.5%) of sesame seedlings. This baseline study suggests that F. proliferatum infection of sesame seeds could be a major source of yield loss in the Punjab, Pakistan which requires further attention. •Sesame yielded Fusarium species as a dominant pathogen.•Three most frequent isolates were accurately identified as Fusarium proliferatum through DNA barcoding.•During various pathogenicity tests, all three isolates were found virulent for sesame seeds and seedlings.•Fusarium proliferatum could be a major source of sesame yield loss in the Punjab, Pakistan which needs further attention.