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|a 10.1094/PD-89-0911B
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|a eng
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|a Rodrigues, J C V
|e verfasserin
|4 aut
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|a Transmissibility of Citrus leprosis virus by Brevipalpus phoenicis to Solanum violaefolium
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|c 2005
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|a Text
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|a ƒaComputermedien
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|a Date Revised 20.11.2019
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|a published: Print
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|a Citation Status PubMed-not-MEDLINE
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|a Citrus leprosis virus (CiLV) constitutes one of the most important viruses in citrus in the areas where it occurs. Two morphological types of virus particles have been described from associated leprosis symptoms, nuclear (CiLV-N) and cytoplasmic (CiLV-C) (4). The CiLV-C is more common, representing more than 99% of samples collected from South and Central America (E. W. Kitajima and J. C. V. Rodrigues, unpublished). Both virus types are associated with the mite vector, Brevipalpus phoenicis (Geijskes) (Acari: Tenuipalpidae). So far, CiLV-C has only been naturally transmitted by these mites to citrus (3). Plants of Solanum violaefolium Schott (Solanaceae) and ornamental and sweet orange seedlings were infested with viruliferous adult female mites, colony no. 61 (GenBank Accession No. AY320027) that were previously maintained on citrus seedlings infected with CiLV-C according to Rodrigues et al. (3). Fifteen days after the mites were transferred, spotted yellowish symptoms were observed on leaves of plants of S. violaefolium and similar symptoms were observed after 25 days on citrus leaves. The symptomatic tissues were studied using transmission electron microscopy. Particles typical of CiLV-C were observed in samples from both plant species. To our knowledge, this is the first reported case of mites transmitting CiLV-C to a noncitrus host. Subsequent experiments showed that mites were able to transmit the virus between plants of S. violaefolium. Attempts to transmit the virus by mites from S. violaefolium to citrus were unsuccessful. The dsRNA viral electrophoresis profile showed differences between the two host plants. Reverse transcription-polymerase chain reaction (RT-PCR) and sequencing assays with primers designed to detect CiLV-C (2) amplified DNA fragments of the expected size and base composition. These data suggest the loss or alteration of some viral components from the Solanum sp. host that might be essential for the transmission or infection in citrus. Such a mechanism may explain why, despite the ever-increasing number of Brevipalpus-transmitted viruses in a large number of different host plant species (1), cross transmission is not common. This information shows one of the potential routes for CiLV to invade citrus orchards, and suggests one alternative host plant that allows rapid multiplication of the virus for characterization. References: (1) E. W. Kitajima et al. Exp. Appl. Acarol. 30:135, 2003. (2) E. C. Locali et al. Plant Dis. 87:1317, 2003. (3) J. C. V. Rodrigues et al. Proc. Int. Org. Citrus Virol. 174, 2000 (4) J. C. V. Rodrigues et al. Exp. Appl. Acarol. 30:161, 2003
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|a Locali, E C
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|a Freitas-Astua, J
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|a Kitajima, E W
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