BREEDING PIERCES DISEASE RESISTANT TABLE AND RAISIN GRAPES AND THE DEVELOPMENT OF MARKERS FOR ADDITIONAL SOURCES OF RESISTANCE

• Author(s): Ramming, David; Walker, Andrew; Lin, Hong;
• Abstract: This year six crosses for Pierces disease (PD) resistant table and raisin grapes using seedless parents were made, resulting in 2,398 ovules and 747 embryos. These crosses were based on Muscadinia and V. tiliifolia sources of resistance. Nineteen seeded crosses consisting of 3,950 emasculations and 49 bagged clusters were made. These crosses were based on V. arizonica, Muscadinia, and southeastern United States (SEUS) sources of resistance. Over 120 selections have been made based on fruit quality and are ready for greenhouse screening for resistance to PD. Two BC2 families from 89-0908 V. arizonica source of resistance segregated in a 1:1 ration for resistance:susceptibility, based on molecular markers associated with the PdR1 locus. A smaller family from the same source of resistance had an unexpectedly small number of resistant seedlings. DNA samples have been collected from 154 seedlings from the C33-30 x BD5-117 family and are ready for SSR marker analysis. Additional seedlings are being produced to increase probability of identifying markers associated with this source of resistance.
• Publication Date: Nov 2006
• Journal: 2006 Pierce's Disease Research Symposium