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Molecular analysis of new isolates of Tomato leaf curl Philippines virus and an associated betasatellite occurring in the Philippines

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Abstract

Three new begomovirus isolates and one betasatellite were obtained from a tomato plant exhibiting leaf curl symptom in Laguna, the Philippines. Typical begomovirus DNA components representing the three isolates (PH01, PH02 and PH03) were cloned, and their full-length sequences were determined to be 2754 to 2746 nucleotides. The genome organizations of these isolates were similar to those of other Old World monopartite begomoviruses. The sequence data indicated that PH01 and PH02 were variants of strain B of the species Tomato leaf curl Philippines virus, while PH03 was a variant of strain A of the species Tomato leaf curl Philippines virus. These isolates were designated ToLCPV-B[PH:Lag1:06], ToLCPV-B[PH:Lag2:06], and ToLCPV-A[PH:Lag3:06], respectively. Phylogenetic analysis revealed that the present isolates form a separate monophyletic cluster with indigenous begomoviruses reported earlier in the Philippines. A betasatellite isolated from same sample belongs to the betasatellite species Tomato leaf curl Philippines betasatellite and designated Tomato leaf curl Philippines betasatellite-[Philippines:Laguna1:2006], ToLCPHB-[PH:Lag1:06]. When co-inoculated with this betasatellite, tomato leaf curl Philippines virus induced severe symptoms in N. benthamiana and Solanum lycopersicum plants. Using a PVX-mediated transient assay, we found that the C4 and C2 proteins of tomato leaf curl Philippines virus and the βC1 protein of ToLCPHB-[PH:Lag1:06] function as a suppressor of RNA silencing.

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Acknowledgments

We are thankful to David Baulcombe for the PVX vector and N. benthamiana 16c seeds. We also thank Project Director, DWR and Dr. N. Rishi for their helpful suggestions during preparation of manuscript. This work was partly supported by grants-in-aid from the Academic Frontier Promotion Program from the Ministry of Education, Culture, Sport, Science and Technology of Japan to M.I. The first author is grateful to the Japan Society for Promotion of Science for financial assistance under the Young Scientist Grant-in-Aid scheme.

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Correspondence to Pradeep Sharma.

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Nucleotide sequence data are available in GenBank under accession numbers AB377111 (PH01), AB37712 (PH02), AB377113 (PH03) and AB308071 (PH0β).

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Sharma, P., Matsuda, N., Bajet, N.B. et al. Molecular analysis of new isolates of Tomato leaf curl Philippines virus and an associated betasatellite occurring in the Philippines. Arch Virol 156, 305–312 (2011). https://doi.org/10.1007/s00705-010-0837-3

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