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Genetic characterization of a putative Densovirus from the mealybug Planococcus citri
M L Thao1, S Wineriter, G Buckingham
1Microbiology Section, University of California, Davis, CA 95616-8665, USA.
Current Microbiology
|October 31, 2001
Summary
Researchers identified a 5.5-kilobase linear DNA molecule in citrus mealybugs (Planococcus citri). This DNA was confirmed as a densovirus, closely related to a cockroach densovirus.
Area of Science:
- Molecular Biology
- Virology
- Entomology
Background:
- Citrus mealybugs (Planococcus citri) are significant agricultural pests.
- Insect viruses, such as densoviruses, can impact host populations.
- Characterization of insect-specific viruses is crucial for understanding host-pathogen interactions.
Purpose of the Study:
- To identify and characterize viral DNA present in citrus mealybug genomic DNA preparations.
- To determine the genetic relationship of the identified virus to known densoviruses.
Main Methods:
- Isolation and purification of genomic DNA from Planococcus citri.
- Molecular cloning of a specific 5.5-kilobase DNA band into the pUC18 vector.
- Nucleotide sequencing of the cloned DNA fragment.
Main Results:
- A distinct 5.5-kilobase linear DNA molecule was isolated from citrus mealybug DNA.
- Sequence analysis confirmed the DNA as the replicative form of a densovirus.
- Phylogenetic analysis indicated the citrus mealybug densovirus is most closely related to the densovirus found in Periplaneta fuliginosa (smokybrown cockroach).
Conclusions:
- A novel densovirus has been identified in the citrus mealybug, Planococcus citri.
- This finding expands the known diversity of densoviruses in insect hosts.
- The close relationship to a cockroach densovirus suggests potential evolutionary links or shared ancestry among insect densoviruses.