Table 1. Major resistance loci in grapevine species that confer resistance to the powdery mildew fungus Erysiphe necator.
| R-locus | Source of resistance | Origin of R-loci | Resistance mechanism | Chromosome | R-gene type | References |
|---|---|---|---|---|---|---|
| RUN1 | M. rotundifolia ‘Thomas’ | North America | PCD of penetrated cell (rapid) | 12 | TIR-NB-LRR gene (MrRUN1) functionally confirmed in transgenic susceptible cultivars | 32 |
| RUN2 | M. rotundifolia ‘Magnolia’/‘Trayshed’ | North America | PCD of penetrated cell (lower frequency compared to RUN1) | 18 | n.d. | 35,84 |
| REN1 | V. vinifera ‘Kishmish vatkana’ | Central Asia | PCD of penetrated cell (significantly slower and lower frequency than RUN1) – hyphal growth and sporulation restricted | 13 | Maps to a CC-NB-LRR gene cluster | 34,39,40 |
| REN2 | V. cinerea ‘Illinois 547-1’ | North America | PCD of penetrated cell (slower than RUN1) | 14 | n.d. | 35,85 |
| REN3 | Interspecific hybrid ‘Regent’ | North America | n.d. | 15 | n.d. | 86 |
| REN4 | V. romanetii | China | PCD of penetrated cell (rapid)/callose encasement of haustoriuma | 18 | n.d. | 37 |
| REN5 | M. rotundifolia ‘Regale’ | North America | Post-penetration but mechanism not reported | 14 | n.d. | 36 |
| REN6 | V. piasezkii | China | PCD of penetrated cell (very rapid)b | 9 | n.d. | Riaz S, 2015, unpublished data |
| REN7 | V. piasezkii | China | n.d. | 19 | n.d. | Riaz S, 2015, unpublished data |
n.d. – not determined.
a
Feechan A, 2015, unpublished data.
b
Dry I, 2015, unpublished data.