فهرست مطالب a. atashi khalilabad
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Large flowered pelargonium (Pelargonium grandiflorum) is a perspective flowering crop which is distributed around the world. The area of its application is quite wide: from room floriculture to design the gardens and parks. Observation of leaf spot symptoms on this plant, which was collected from Alborz province (Karaj) motivated us to find the causal agent(s) of the disease. So, the symptomatic parts were cultured on the PDA medium after surface sterilization. Two fungal colonies were appeared on the culture medium. They were identified as Alternaria alternata and Botrytis cinerea according to the morphological characterizations. Molecular study using the gapdh for Alternaria and ITS regions and rpb2 gene for Botrytis confirmed the result of the morphological identification. In the pathogenicity tests, the same spots on inoculated plants with Alternaria and the same spots plus gray mold symptoms and fungal body on leaves, buds and stems of the inoculated plants with Botrytis were another confirmation. Based on our knowledge, this is the first report of these two fungal species on the Pelargonium grandiflorum in Iran.
Keywords: disease, fungi, phylogeny, pathogenicity, Pelargonium} -
خصوصیات ریخت شناختی و مولکولی گونه trachycarpicola Pestalotiopsis عامل لکه برگی کروتون باغی در ایران
In the spring of 2021, leaf spot disease symptoms were observed in the Garden Croton (Codiaeum variegatum) plants in one of the ornamental plant greenhouses of Mahallat County, Markazi Province, Iran. To identify the causal agent of the disease, infected plant leaves sampled and then were transferred to the mycology laboratory and nine fungal isolates were recovered. The fungal isolates were characterized based on the morphological features and molecular data using the combined sequences of the internal transcribed spacer (ITS) regions and the translation elongation factor 1-alpha (tef) gene for a representative isolate UT2022. According to the morphology and phylogenetic analysis, the isolate UT2022 was identified as Pestalotiopsis trachycarpicola. The pathogenicity of the isolate UT2022 was performed on healthy and growing leaves of the C. variegatum plants. Inoculated leaves showed leaf spot symptoms 14 days after the inoculation, while the leaves of the control plants were symptomless. To complete Koch’s postulate, P. trachycarpicola was re-isolated from the newly produced leaf spots. Based on the bibliography, P. trachycarpicola is reported as a new taxon for fungi of Iran, as well as P. trachycarpicola is reported as the causal agent of the leaf spot symptom of the C. variegatum in the world.
Keywords: Codiaeum variegatum, Fungal disease, ITS, TEF, pathogenicity}
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