ISHS Acta Horticulturae 110: V International Symposium on Virus diseases of Ornamental Plants
CARNATION CRYPTIC VIRUS |
| Authors: | V. Lisa, E. Luisoni, R.G. Milne |
| Abstract:
During the electron microscopic examination of carnation samples from northern and central Italy, a small isometric virus was detected in low concentration. The virus differed from any carnation virus so far described, and because of its properties has been named carnation cryptic virus (CCV). As virus source, we used a plant of Mediterranean carnation multiplied by means of cuttings. Mechanical transmission tests were made with sap expressed from infected leaves in various ways and with various additives, or by inoculating partially purified virus. No mechanical transmission was obtained in six Caryophyllaceae (including carnation) and eight other normally used test species. Attempts to transmit the virus by grafting the original carnation on virus-free Mediterranean, Sim and Chabaud varieties were always negative, although the grafts took successfully and although, when tested 3 months later, the scions still contained the virus. In aphid transmission experiments with Myzus persicae positive results have not yet been obtained. CCV was, on the other hand, transmitted through 10% of the tested seed of the carnation cv. Chabaud, 90–100% of that of Mediterranean cultivars and 100% of that of Dianthus caryophyllus x D. chinensis hybrids. All the tested seeds came from varieties in which CCV was not previously known to be present. No particular symptoms have ever been observed in plants infected with CCV. Thin sections of the plants examined in | |
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