Grapevine yellow speckle agent implicated in the aetiology of vein banding disease
DOI:
https://doi.org/10.5073//vitis.1983.22.40-50Abstract
The vein banding strain of fanleaf virus, purified from a vein banding and yellow speckle diseased Sultana clone, lost the ability to induce vein banding leaf symptoms in healthy Mission Seedling 1, LN 33, Cabernet Franc and Mataro grapevines. The same virus isolate in combination with yellow speckle disease produced the same range of leaf symptoms as those induced by the vein banding disease source in LN 33, Cabernet Franc and Mataro vines. The leaf symptoms associated with yellow speckle and yellow speckle combined with the vein banding virus within each cultivar were identical in type although differences in severity occurred in Sultana, LN 33 and Cabernet Franc in some years.
We present the hypothesis that the leaf symptoms associated with vein banding disease are due to a yellow speckle infection, intensified by co-infection with fanleaf virus.
Die Bedeutung des Erregers von Grapevine yellow speckle in der Aetiologie von Vein banding disease
Aus einem Sultana-Klon, der an Vein banding und Yellow speckle erkrankt war, wurde der Vein-banding-Stamm des Fanleafvirus in gereinigter Form gewonnen; dieser Stamm besaß nicht mehr die Fähigkeit, an den Blättern gesunder Reben der Sorten Mission Seedling 1, LN 33, Cabernet Franc und Mataro Vein-banding-Symptome auszulösen. Dasselbe Virusisolat erzeugte jedoch in Verbindung mit Yellow speckle disease die gleichen Blattsymptome, wie sie durch die ursprüngliche Virusquelle von Vein banding disease bei LN 33, Cabernet Franc und Mataro induziert wurden. Die bei Yellow speckle beobachteten Blattsymptome waren vom Typ her bei allen Rebsorten identisch mit den Symptomen der Mischinfektionen von Yellow speckle und Vein-banding-Virus; allerdings konnte der Grad der Symptomausprägung bei Sultana, LN 33 und Cabernet Franc jahrgangsweise variieren.
Es wird die Hypothese aufgestellt, daß die mit Vein banding verbundenen Blattsymptome auf eine Yellow-speckle-Infektion zurückgehen und durch eine Mischinfektion mit Fanleafvirus verstärkt werden.
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