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Insect-to-insect horizontal transmission of a phytoreovirus in the absence of an infected plant host

Author:
Drake C. Stenger, Rodrigo Krugner
Source:
Virology 2021 v.562 pp. 87-91
ISSN:
0042-6822
Subject:
Citrus, Homalodisca vitripennis, Phytoreovirus, cowpeas, females, host plants, imagos, immunity, insect vectors, nymphs, progeny, secondary transmission, seedlings, vertical disease transmission, viral diseases of plants, virion, virus transmission, xylem
Abstract:
Vertical transmission of Homalodisca vitripennis reovirus (HoVRV) from glassy-winged sharpshooter (GWSS, Homalodisca vitripennis (Germar)) females to progeny occurred in laboratory assays at frequencies too low (2.6%–15.4%) to account for HoVRV incidence (90–100%) in field populations resident in citrus. Because citrus is immune to HoVRV and no plant host is known, horizontal transmission of HoVRV from insect-to-insect was evaluated. Exposure of colony-reared, virus-free test nymphs to HoVRV-infected source adults held in the same cage for 10 days on virus-immune cowpea resulted in HoVRV transmission (13.3%–30.7%) to test nymphs. HoVRV was not transmitted when exposure was indirect and required passive movement of virions through the xylem of immune citrus seedlings. Collectively, these results demonstrate direct insect-to-insect horizontal transmission of HoVRV, providing a plausible explanation for high incidence of HoVRV in GWSS field populations in the absence of efficient vertical transmission or a plant host.
Agid:
7444760
Handle:
10113/7444760