ویژگی‌های نوکلئوتیدی قارچ Fusarium oxysporum f. sp. radicis-lycopersici عامل پوسیدگی ریشه و طوقه گوجه‌فرنگی

In recent years, tomato root and crown rot caused by Fusarium oxysporum f. sp. radicis-lycopersici (FORL) has become a major issue in southern Iran, causing significant damage to tomato crops. To explore the nucleotide characteristics of the tef-1α gene region of this pathogen, Iranian sequences submitted in the GenBank were compared with other valid sequences. The study found significant differences in nucleotide frequency and substitution rates among the analyzed sequences. Cytosine had the highest base frequency (29.5% across all isolates), while guanine had the lowest (21.2% in Iranian isolates and 21.7% in non-Iranian isolates). Furthermore, the average rate of base substitution was 8% in Iranian isolates, compared to 14% and 5% in non-Iranian isolates (highest and lowest, respectively). These variations can be linked to different climatic conditions and the continuous cultivation of various tomato varieties, which have resulted in diversity within the F. oxysporum species complex, potentially leading to speciation over time.
In recent years, tomato root and crown rot caused by Fusarium oxysporum f. sp. radicis-lycopersici (FORL) has become a major issue in southern Iran, causing significant damage to tomato crops. To explore the nucleotide characteristics of the tef-1α gene region of this pathogen, Iranian sequences submitted in the GenBank were compared with other valid sequences. The study found significant differences in nucleotide frequency and substitution rates among the analyzed sequences. Cytosine had the highest base frequency (29.5% across all isolates), while guanine had the lowest (21.2% in Iranian isolates and 21.7% in non-Iranian isolates). Furthermore, the average rate of base substitution was 8% in Iranian isolates, compared to 14% and 5% in non-Iranian isolates (highest and lowest, respectively). These variations can be linked to different climatic conditions and the continuous cultivation of various tomato varieties, which have resulted in diversity within the F. oxysporum species complex, potentially leading to speciation over time.