Stylet-borne virus

Definition

A plant virus transmitted by piercing-sucking insects that carry virions attached to the cuticular lining of the stylet food canal, without replication in the vector. Transmission occurs during brief intracellular punctures (potential drops) as the insect probes for phloem, and virions are acquired and inoculated within minutes to hours without a latent period. This nonpersistent or semipersistent mechanism contrasts with circulative transmission, where viruses pass through the gut and salivary glands.

Etymology

From 'stylet,' the needle-like mouthpart of piercing-sucking insects, plus 'borne,' carried or transported.

Example

The potyvirus Bean common mosaic virus is stylet-borne by aphids such as Aphis fabae, which acquire virions on their maxillary stylets while probing epidermal cells and can transmit immediately upon moving to a new host plant.

Synonyms

• nonpersistently transmitted virus
• stylet-borne plant virus

Related Terms

• circulative virus
• propagative virus
• nonpersistent transmission
• semipersistent transmission
• stylet
• foregut-borne virus
• vector specificity
• acquisition access period
• inoculation access period

Usage Notes

The term is sometimes used interchangeably with 'nonpersistent virus,' though 'stylet-borne' more precisely describes the anatomical attachment site, while 'nonpersistent' emphasizes the epidemiological brevity of retention (hours to days). Some semipersistent viruses are foregut-borne rather than strictly stylet-borne, so the terms are not fully overlapping. The mechanism was first demonstrated by electron microscopy showing virions adsorbed to the stylet cuticle. Stylet-borne transmission is particularly important in agricultural epidemiology because vectors can acquire and transmit virus during brief probing visits, making control by insecticides difficult.