ISHS Acta Horticulturae 164: VI International Symposium on Virus Diseases of Ornamental Plants
SOME ASPECTS OF VIRUS INFECTION IN FORSYTHIA SPP. |
| Author: | M. Kaminska |
| Abstract:
Nine viruses were detected during the testing of 685 Forsythia spp. shrubs growing in seven nurseries in Poland. It was found that nepoviruses were relatively widespread in forsythia. The percentage of infected shrubs varied from 6 to 35 depending on the nursery. Tomato black ring virus (TBRV) was the most common virus of forsythia, and it was usually associated with infection by raspberry ringspot virus (RRV). In one nursery cherry leaf roll (CLRV), arabis mosaic (AMV), and tobacco ringspot viruses (TobRV) were detected. Tobacco necrosis virus (TNV) was present in the roots but not in the shoots of the tested plants. The virus Wr-1 which occurs in forsythia was not identified. Great differences were observed in the detectability of viruses from forsythia in an experiment in which shrubs were infected with known viruses. TBRV was isolated in 57–90% of the cases depending on the isolate, while CMV and RRV were isolated in 32 and 25%, of the cases respectively. The best detection was obtained using developing flower buds or young leaves in spring and autumn. Only TBRV could be isolated from dormant buds in winter and leaves in summer. C h. quinoa plants were much more useful for detection of viruses than tobacco Sumsun or cucumber. Healthy forsythia plants, mechanically inoculated, became infected and after two weeks exhibited local and systemic symptoms. During three years of observation under field conditions it was noticed that after the shock stage, most of the infected plants recovered. Testing revealed that from some of the infected plants the viruses could not be isolated. On the other hand, other plants became naturally infected with TBRV, RRV or tobacco rattle virus (TRV). The percent of these plants was respectively 40, 25 and 4. The growth of all the plants from which viruses were isolated was significantly reduced as compared with the growth of control and recovered plants. | |
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