Table 3.

R. padi olfactory response to odour of barley after the exposure of one cultivar to volatiles from another

Inducing genotype	Responding genotype	Observations in olfactometer arm (mean ± SE)				P- level
(a) Inducing genotype remained in the inducing chamber
A	B	AB	0B	BB	Blank
Alva	Hulda	2.0 ± 0.37	2.5 ± 0.41	2.4 ± 0.39	2.1 ± 0.31	n.s.
Hulda	Alva	1.3 ± 0.23	2.3 ± 0.42	2.4 ± 0.46	2.2 ± 0.39	n.s.
Alva	Kara	1.6 ± 0.32	1.6 ± 0.28	3.3 ± 0.42	2.2 ± 0.44	0.027
Kara	Alva	1.9 ± 0.24	2.7 ± 0.36	2.7 ± 0.45	1.9 ± 0.35	n.s.
(b) Inducing genotype was removed from the inducing chamber
A	B	A*B	0B	B*B	Blank
Alva	Hulda	2.5 ± 0.37	2.4 ± 0.39	1.8 ± 0.47	1.7 ± 0.39	n.s.
Hulda	Alva	2.3 ± 0.44	1.9 ± 0.35	2.2 ± 0.30	2.0 ± 0.37	n.s.
Alva	Kara	1.5 ± 0.33	1.9 ± 0.34	3.5 ± 0.47	1.8 ± 0.32	0.026
Kara	Alva	1.9 ± 0.31	2.7 ± 0.39	2.7 ± 0.40	1.8 ± 0.32	n.s.

AB represents a two-chamber cage where a responding genotype B was exposed to volatiles from an inducing genotype A. 0B is two-chamber cage without plants in the first chamber, where genotype B was not exposed to plant volatiles. BB is a two-chamber cage with the same genotype in both chambers, where genotype B is exposed to volatiles from the same genotype. A*B is a two-chamber cage with different genotypes in each chamber, where the inducing genotype A was removed. B*B is two-chamber cage with the same genotype in both chambers, where cultivar B was removed from the inducing chamber

P values from the Friedman ANOVA test

n.s. not significant P > 0.05