Four seed-quality measures in orchids with different pollination systems

Figures & data

Figure 1. Pollination effect on seed quality on deceptive Orchis militaris (left) and on rewarding Platanthera chlorantha (right): number of seeds per capsule, abortion measured as relation empty/normal seeds, viability by a tetrazolium staining test, germination in vitro. Error bars are SEs (see text) the level of statistical significance of the effect of pollination treatment for each quality indicator (ns, not significant *p < 0.05 **p < 0.01 ***p < 0.001). Bars with different letters [(a), (b) and (c)] are significantly different (p < 0.05) by a Tukey honest significant difference test for unequal sample sizes.

Table 1. Pearson’s correlation coefficients and their statistical significance between seed quality measures: (1) seed number (2) abortion (3) viability (4) germination) in deceptive Orchis militaris for three pollination treatments.

Control	(1)	(2)	(3)	(4)
(1) Seed number	1.000
(2) Abortion	–0.630**	1.000
(3) Viability	–0.044	–0.083	1.000
(4) Germination	–0.117	–0.141	0.545**	1.000
Cross-pollination
(1) Seed number	1.000
(2) Abortion	–0.607***	1.000
(3) Viability	-0.099	–0.069	1.000
(4) Germination	0.145	–0.118	–0.098	1.000
Self-pollination
(1) Seed number	1.000
(2) Abortion	–0.446*	1.000
(3) Viability	0.125	–0.379	1.000
(4) Germination	–0.017	–0.225	0.422	1.000

^* p < 0.05

^** p < 0.01

^*** p < 0.001.

Table 2. Pearson's correlation coefficients and their statistical significance between seed quality measures in rewarding Platanthera chlorantha for three pollination treatments.

Control	(1)	(2)	(3)	(4)
(1) Seed number	1.000
(2) Abortion	–0.407***	1.000
(3) Viability	0.292	–0.138	1.000
(4) Germination	0.088	–0.240	0.397***	1.000
Cross-pollination
(1) Seed number	1.000
(2) Abortion	–0.544*	1.000
(3) Viability	–0.092	0.050	1.000
(4) Germination	–0.287	–0.075	0.540*	1.000
Self-pollination
(1) Seed number	1.000
(2) Abortion	0.576**	1.000
(3) Viability	0.088	0.231	1.000
(4) Germination	0.390	0.253	0.983***	1.000

^* p < 0.05

^** p < 0.01

^*** p < 0.001.