BMC Ecology and Evolution

Table 2 Infection rates and proportion of homospecific backcrosses for the four given hybrid genotypes

From: Experimental hybridization and backcrossing reveal forces of reproductive isolation in Microbotryum

Gamete type* and isolates no.	Silene latifolia					Silene colorata
Gamete type* and isolates no.	A	B	C	D	p	A	B	C	D	p
M-Sl _a1 ^H	147	123	120	0.69	0.00	116	63	37	0.39	0.32
1	37	32	31	0.52		29	13	4	0.50
2	33	28	28	0.89		33	17	12	0.58
3	44	35	32	0.72		28	15	13	0.46
4	33	28	29	0.62		26	18	8	0.00
M-Sl _a2 ^H	153	126	100	0.63	0.01	98	68	63	0.59	0.13
19	42	37	23	0.52		28	21	18	0.61
20	37	32	24	0.58		29	22	19	0.58
22	39	30	29	0.69		21	14	16	0.75
23	35	27	24	0.71		20	11	10	0.40
M-Sd _a1 ^H	140	110	52	0.46	0.68	93	54	42	0.33	0.02
12	41	36	15	0.67		22	12	7	0.43
13	30	23	12	0.25		23	14	10	0.50
15	37	29	17	0.41		28	15	14	0.21
16	32	22	8	0.50		20	13	11	0.18
M-Sd _a2 ^H	145	129	67	0.45	0.46	107	53	41	0.41	0.21
8	34	30	18	0.39		19	8	7	0.43
9	33	30	15	0.53		24	14	11	0.27
10	37	33	18	0.61		34	13	14	0.36
11	41	36	16	0.25		41	18	9	0.56

*M-Sl_a1^H: haploid hybrid genotype with a1 mating type chromosome originating from M. lychnidis-dioicae; M-Sd_a2^H: haploid hybrid genotype with a2 mating type chromosome originating from M. silenes-dioicae (and vice versa for M-Sd_a1^H and M-Sl_a2^H). A: number of plants inoculated; B: number of infected plants; C: number of infected flowers genotyped; D: proportion of infection arising from homospecific backcrosses, p: binomial probability. Numbers in bold: summed (A,B,C) and averaged (D) values for the four isolates of each gamete type.

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