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Grape Variety: O39-16

Variety Name O39-16
Common Synonyms VR039-16
All Synonyms VR O39-16
Countries of Origin USA
Species Interspecific cross (rotundifolia; vinifera)
Breeder H.P. Olmo
Institution Calif.Agr. Expt. Stn. (Davis, CA)
Year Released 1991
Pedigree Almeria x Muscadinia rotundifolia male no. 1
References
Uses Rootstock
Comments O39-16 was developed at the University of California, Davis. It has very strong resistance to Xiphinema index, the dagger nematode vector of grapevine fanleaf virus (GFLV). Although this rootstock resists X. index feeding, it allows movement of GFLV into scions, however the severe decline in fruit set typical of GFLV infection does not occur. At this point, the mechanism by which O39-16 induces tolerance to fanleaf degeneration is unknown, but it is likely due to O39-16's ability to alter phytohormone levels. O39-16 has proven to be resistant to phylloxera, although its vinifera parentage casts doubt on its use in other than fanleaf sites, where it remains the only rootstock choice. O39-16 imparts high vigor to scions where water is ample and can produce wines with high pH and potassium levels, and vegetative characters. It is an interim rootstock solution to fanleaf, and breeding for fanleaf resistance continues at UC Davis. This rootstock is a full sibling to O43-43.

O39-16 PhotosClick photo to enlarge

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O39-16 Selections

Information about:          Selection Numbers     |     Registration Status
  O39-16 01
Registration Status Registered Registered is the ultimate status in the California Department of Food & Agricultures Grapevine Registration & Certification Program. Registered selections have successfully completed all disease testing required by the regulations. Registered selections have also been confirmed as true to variety by experts using visual observations, DNA-based testing or both.
Source Department of Viticulture & Enology, University of California, Davis
Treatments None , Tissue Culture Excision
Comments This selection came to Foundation Plant Services in the early 1980's from the vineyard of the Department of Viticulture & Enology, University of California, Davis (location M32 v15). After successful completion of testing, O39-16 FPS 01 was planted in the foundation vineyard in 1985. The patent on this variety expired in 2006.