Self-Compatibility Sources as Sources of Variation in Advanced Almond Introgression Lines TM Gradziel Department of Plant Sciences, University of California, Davis, CA 95616 02,7159 Transfer of self-fruitfulness from related species (P. webbii, P. persica, P. mira) to almond Species Accessions Closest Prunus SFB Prunus davidiana A Prunus armeniaca B Prunus armeniaca C Prunus persica D Prunus dulcis E Prunus spinosa Prunus mira F Prunus persica F Prunus armeniaca G Prunus armeniaca E Prunus persica Prunus webbii F Prunus cerasus G Prunus avium H Prunus mume Tao et al, 2007; Hanada et al. 2014; Akagi et al. (in-press) Multiple forms of the self-compatibility gene exist but very few are utilized. 06,2-247 00,8-27 Multiple back- Nonpareil F8,7-179 crosses are needed to recover market types. Performance of different species sources differ when moved to almond New Planting Fig. 3. Seed-set following honeybee self-pollination on enclosed trees showing sizable capacity for self-compatibility for the Winters variety. Relatively high levels of self-fruitfulness are sometimes observed in self-incompatible genotypes Selection Seed ParentPollen Parent Origin Pedigree D3-15 (NP*F5,4- 43[W*W][SEL5-15SLF])) * D3-25(NP*F5,4- 2005,10-270 Winters F8,7-179 WP 11[W*W][SEL5-15SLF]) D3-11 * F7,1-1 (Sel5- 15[NP*LukensHoneyXMis]* WSB3b25)(Sel5- 2005,2-108 Nonpareil A98,2-348 P 15[NP*LukensHoneyXMis]* Self-fruitful 25-75WSB3b25) [Arb * 4-26]*[SB4, 4- 2E] * WINTERS 2005,5-17 Winters A97,1-232 M selections D3-15 (NP*F5,4- 43[W*W][SEL5-15SLF])) * D3-25(NP*F5,4- 2005,9-340 Winters F8,7-179 WP 11[W*W][SEL5-15SLF]) developed from D3-15 (NP*F5,4- A00,1-180 43[W*W][SEL5-15SLF])) * D3-25(NP*F5,4- 2006,2-24 Nonpareil +A97,3-40 WP 11[W*W][SEL5-15SLF]) different species D3-15 (NP*F5,4- A00,1-180 43[W*W][SEL5-15SLF])) * D3-25(NP*F5,4- and 2006,2-60 Nonpareil +A97,3-40 WP 11[W*W][SEL5-15SLF]) NP *F8,7-179 different 2006,3-19 Winters A00,8-27 WP F7,2-9 (Sel5-15 slf) F2 species mixes 2006,4-134 Nonpareil A96,1-133 P F7,2-9 (Sel5-15 slf) F2 are now 2006,5-134 Tardy NP A96,1-133 P F7,2-9 (Sel5-15 slf) F2 being tested 2006,5-40 Nonpareil A96,1-133 P F7,2-9 (Sel5-15 slf) F2 2006,5-46 Nonpareil A96,1-133 P 25-75 [Arb * 4-26]*[SB4, 4- 2E] * WINTERS 2007,2-127 Winters A97,1-227 M NP *F8,7-179 2008,3-125 Nonpareil A00,8-27 WP Summary • Sf potential varies with species source(s). • Sf potential varies with source within species. • Self-fruitfulness varies with Sf source as well as genetic (including developmental) background. • Optimum Self-fruitfulness may require optimizing each component. .