Molecular identification and genetic variation of Alternaria species isolated from tomatoes using ITS1 sequencing and inter simple sequence repeat methods

Authors

Department of Biology, Faculty of Science, Lorestan University, Khorramabad, Iran

Abstract

Background and Purpose: Alternaria is one of the most abundant fungi that exists in numerous places around the world. This saprophytic fungus causes diseases in plants and accounts for the spoilage of cereals in warehouses. The aim of this study was to identify Alternaria isolates based on their morphological characteristics and internal transcribed spacer ribosomal RNA (ITS rRNA) sequencing method. To this end, genetic diversity in the isolates was also examined using inter simple sequence repeat (ISSR) markers.

Materials and Methods: To conduct this research, a total of 60 tomato samples with black spots were collected from supermarkets in Khorramabad City, Iran, in the winter of 2017. The specimens were cultured on a potato dextrose agar medium. After the purification of the fungus by the single-spore method, the identification of the species was carried out using morphological characteristics and ITS rRNA sequencing by polymerase chain reaction. The genetic diversity of the identified species with four primers was evaluated using the ISSR marker.

Results: Based on the sequencing of the ITS1 region, all the isolates were identified as A. alternata. Cluster diagrams for the ISSR marker were classified into six distinct groups. The mean polymorphism information content was obtained as 0.35, indicating the effectiveness of the primers in the separation of the isolates.

Conclusion: The sequencing of ITS1 led to the identification of Alternaria species that are morphologically similar. The production of various mycotoxins by A. Alternata species leads to the contamination of livestock and human food. Regarding this, the investigation of the genetic diversity of A. alternata species using the ISSR marker would facilitate the identification of suitable and effective strategies for controlling the fungal and mycotoxin contamination of human nutrition.

Keywords

References

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Current Medical Mycology
Volume 5, Issue 2
June 2019
Pages 1-8

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History

  • Receive Date: 09 July 2019
  • Revise Date: 07 September 2020
  • Accept Date: 09 July 2019
  • Publish Date: 01 June 2019

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