| 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 |
- The Brooks and Olmo Register of Fruit & Nut Varieties. Third Edition. 1997. ASHS Press, Alexandria, Virginia.
- Vitis International Variety Catalogue (VIVC). Federal Centre for Breeding Research on Cultivated Plants (BAZ).
Institute for Grapevine Breeding Geilweilerhof (IRZ). August, 2007. Link
The former National Grape Registry (NGR) was initially compiled and annotated using the earlier version of the Vitis database. The VIVC underwent a significant update beginning in 2007. Corresponding updates to this Registry will be made as necessary.
|
| 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. |
