Investigation of viruses and phytoplasma infections in tomato plantations in Bilecik province, Türkiye
2024
Randa Zelyüt, Filiz | Karanfil, Ali | Santosa, Adyatma Irawan
In this study, the status of infections caused by viruses and phytoplasmas in tomato production areas of Bilecik province was determined using conventional molecular methods. During the 2022 tomato production season, 93 plants exhibiting symptoms such as mosaic, leaf and fruit deformations, flower anomalies, and necrotic spots were collected. Viral agents such as tomato spotted wilt virus (TSWV), cucumber mosaic virus (CMV), southern tomato virus (STV), tobamoviruses, and potyviruses were screened by RT-PCR, while phytoplasmas were detected by nested-PCR. Single, double, and triple infections were detected in 50 of the 93 plants. 17, 5, and 21 plants were infected by a single pathogen for TSWV, STV, and phytoplasmas, respectively. 1, 3, and 2 plants were infected by two pathogens for STV+TSWV, STV+phytoplasma, and TSWV+phytoplasma, respectively. Only one plant detected a triple infection caused by STV, TSWV, and phytoplasmas. The phytoplasma genetic group was determined as 16Sr XII-A by PCR RFLP in-silico and in-vitro methods. Sequencing studies revealed that TSWV had high nucleotide sequence similarity with other Türkiye isolates for the NSs partial gene and STV entire CP gene region. For phytoplasmas, sequencing studies showed that the obtained tomato strains overlapped one-to-one with stolbur strains. Phylogenetic analyses applied with global isolates for TSWV NSs and STV CP gene regions showed the existence of 2 main groups (Clade I and Clade II). TSWV and STV isolates obtained from this study clustered in large main branches (Clade I).
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