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Bahram Sharifnabi, Reza Raghebi, Fariba Ghaderi,
Volume 10, Issue 1 (2-2021)
Abstract

Sharifnabi B, Raghebi R, Ghaderi F (2021) Smuts of poaceous plants in Markazi and Lorestan Provinces of Iran. Plant Pathology Science 10(1):42-63.   Doi: 10.2982/PPS.10.1.42.

Introduction: Poaceous plants such as corn, wheat, barley, sorghum, oats and millet are an important part of agricultural ecosystems. Smuts are one of the most important fungal diseases of these plants, which often cause economic damage and the destruction of part or all of their yields. Materials and Methods: Poaceous smut infected plants in farms and pastures of Markazi and Lorestan provinces were sampled. Morphological characteristics of these fungi and their germination type of teliospores were studied with bright field and fluorescent microscopes and identified using valid keys. The phylogenetic relationship of these fungi with other smuts was also investigated based on ITS-rDNA region sequencing. Results: According to the type of host, morphological characteristics and mode of teliospores germination 12 species vs. U. maydis, U. hordei, U. turcomanica, U. avenae, U.nuda, U. bromivora, U. cynodontis, U. tritici, Tilletia laevis, Tilletia controversa Sporisorium reilianum and S. cruentum were diagnosed. The morphological characteristics and phylogenetic relationship of these fungi with other smuts are described. Conclusion: The smuts of poaceous plants in Markazi and Lorestan provinces include eight species of the genus Ustilago, two species of the genus Sporisorium and two species of the genus Tilletia.

Sedigheh Mohammadi, Zahra Roosefid,
Volume 13, Issue 2 (9-2024)
Abstract

Aflatoxins are toxic metabolites produced by certain Aspergillus species. They cause disease and contaminate food, so reducing and controlling these toxins is extremely important. Due to their antifungal properties, essential oils and extracts from medicinal plants are increasingly used. As part of this study, the medicinal plants Salvia mirzayanii and Mentha piperita were harvested from their original habitat in Hormozgan Province and essential oils were extracted. Subsequently, the toxin-producing fungus A. flavus was isolated and purified from maize kernels, and the effect of the essential oil of both plants on the toxigenicity of A. flavus and the expression of the aflatoxin-encoding gene was investigated using real-time PCR. The antifungal properties were assessed using the disk diffusion method and a mixed evaluation, and then the effective concentration of the essential oil in both plants was determined. The essential oils of both plants effectively inhibited the growth of A. flavus at concentrations of 1000 and 2000 ppm. However, peppermint essential oil significantly reduced toxin production and had a stronger effect on the expression of the gene encoding aflatoxin at a concentration of 2000 ppm. Considering the effectiveness of peppermint essential oil at a concentration of 2000 ppm on the expression of the gene encoding aflatoxin, this essential oil can be introduced as a biological and safe method for the biological control of aflatoxin.


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