Table 1.

Slope of the relationship between average seed production of inoculated and control plants of the same host line. The Student t-test (5 d.f.) tests whether the slope equals one. Since we test the same hypothesis multiple times we mark in italics only those tests significant after Bonferroni correction of the critical α-value.

	slope coefficient	Student t	p-value
mean of all inoculated plants	0.511	5.242	0.0033
mean by origin
Laboratory	0.364	7.074	0.0009
Fribourg	0.571	4.074	0.0096
Orsay	0.671	2.022	0.0991
mean by strain
Emco	0.226	5.308	0.0032
Emwa	0.197	5.395	0.0030
Noco	0.669	4.057	0.0098
Fri3	0.488	5.312	0.0032
Fri5	0.655	2.571	0.0500
Ors3	0.587	2.832	0.0366
Ors5	0.755	1.175	0.2928