ISHS Acta Horticulturae 550: XVIII International Symposium on Virus and Virus-like Diseases of Temperate Fruit Crops - Top Fruit Diseases
TRACKING HOP STUNT VIROID INFECTION IN APRICOT TREES DURING A WHOLE YEAR BY NON-ISOTOPIC TISSUE PRINTING HYBRIDISATION |
| Authors: | K. Amari, M.C. Caņizares, V. Pallás, A. Myrta, S. Sabanadzovic, B. Di Terlizzi |
| Abstract:
Hop stunt viroid (HSVd) is the viroid with the broadest host range known so far. In some hosts, such as grapevine and apricot, the infection seems to be latent. In other species, HSVd is found associated with disorders of serious economic importance e.g. hop stunt and dapple fruit in plum and peach, and citrus cachexia. A recent study (Caņizares et al., 1998) revealed the presence of HSVd in 81 % of the apricot trees tested in south-eastern Spain. By using a non-isotopic tissue printing technique we found that petiole tissue was a very good source of viroid. We then used transversal sections of infected petiole tissue to follow the presence of HSVd in apricot trees during a whole year. The results showed that viroid titter was higher from May to July, after which the accumulation level of HSVd slightly decreased. Surprisingly, by December, the viroid title had recovered levels similar to those observed in July. The significance of these results is discussed. | |
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