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Reference: Virus dynamics in vineyards and a simulation study on the interaction of RNA-viruses and immune system of plants
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Over seven years it was investigated how the pattern of virus detections in the grapevines of some vineyards changes. For this reason at the beginning of the experiment young grapevines (two years or younger) and older ones (older than ten years) of the same site were compared. Frequency of virus species, temporal development of detection, correlation of detection quantity of "young" and "old" grapevines of the same vineyard, quantity of multiple infections and similarity of rows and vineyards were determined to evaluate the relative significance of transmission by animals or vineyard management, respectively. However, indisputable evidences for virus transmission could not be concluded from the virus detection patterns. Nevertheless some viruses were very frequent - 46% of all grapevines were infected with GLRaV-1 and more than 26% with GFkV - and the quantity of virus species, especially nepoviruses, was very high although they were not able to spread on most sites since animal vectors were not present. Often detection was not possible in all investigated years and significant grapevine damage was not observed. Alternative ways of virus transmission (without vectors), through soil water or aerosols, are discussed as well as the phenomenon of latency concerning RNA-viruses, which, contrary to DNA-viruses, are not able to insert into the host genome. To improve the understanding of interactions of virus and immune system of grapevines, a simulation was performed, considering immune repression through viruses and the existence of vectors. In the simulation permanent coexistence of an active, adaptive immune system with viruses was not possible, although it is observed in practice. Thus an important piece of the jigsaw puzzle, that leads to an understanding, how RNA-virus latency or induction of permanent disease in grapevines is possible, is still missing.

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Publication Details

Published: 2018
Publication: Mitteilungen Klosterneuberg
Issue: 2018 68-3 p148-171
Author: Gangl H 2018


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