Table 3.

Di-allelic self-incompatibility (DSI) and poly-allelic SI (PASI) models functioning at the pollen tube/stigma and pollen tube/ovary levels in the olive tree. DSI from Saumitou-Laprade et al. [12]; PASI from Breton et al. [10].

Type of Inheritance	S-Allele	Dominance Level	Encountered S-Allele Pairs	Expression Level	Expression of Pollen Tube	Remarks
DSI	S1	Recessive versus S2	S1S1 = G2	Stigma	S1	Di-allelic SI
	S2	Dominant versus S1	S1S2 = G1	data	S2	S2S2 cannot exist
		In stigma S2 > S1
PASI	R6	More dominant	R1R6, R2R6, R3R6, R4R6, R5R6	Ovary [R1R6], [R2R6], [R3R6], [R4R6], [R5R6]	R6	R6R6 cannot exist unless R7 > R6 exist
	R2		R1R2, R2R3, R2R4, R2R5,	Ovary [R1R2], [R2R3], [R2R4], [R2R5]	R2	R2R2
	R1 = R3 = R5		R1R4, R3R4, R4R5, R1R3, R1R5, R3R5	Ovary [R1R3], [R1R5], [R3R5]	R1, R3, R5, R1R3, R1R5, R3R5	R1, R3, R5, R1R3, R1R5, R3R5
	R4	More recessive		Ovary	R 4	R4R4, not encountered yet