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Papaya lethal yellowing virus
Papaya Lethal Yellowing Virus (PLYV) is an isometric viral plant pathogen, tentatively assigned to the genus Sobemovirus, that causes lethal yellowing disease of the papaya plant.
The virus infects only ''Carica papaya, Jacaratia heterophylla, J. spinosa, Vasconcellea cauliflora, V. monoica'' and ''V. quercifolia'', all from the papaya family Caricaceae. It is only found in Northeastern Brazil and has no confirmed biological vectors.〔 PLYV consists of a 36 kDa capsid protein〔 and a single-stranded RNA genome 4145 nt in length,〔 and causes progressive leaf yellowing and greenish circular spots on the fruits. Control of this virus is of economic importance in Northeast Brazil, as 60% of Brazil’s papaya production occurs there.
==Hosts and Symptoms==
As the name implies, PLYV is very host-specific. In an inoculation study, the virus only infected members of the papaya family Caricaceae, whereas other species (''Chenopodium amaranticolor'', ''C. murale'', ''C. quinoa'' and ''Nicotiana benthamiana'') were not infected.〔
The signs of the virus begin to become visible when the leaves at the top of the plant begin turning yellow and eventually fall off. This usually occurs in the upper third of the canopy and death of the plant usually occurs soon after the leaves wilt and die.〔 The fruit in some studies was found to be delayed in the ripening process and the pulp turns hard.〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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