Table 2.

C. septempunctata olfactory response to odour of barley after the exposure of one genotype to volatiles from another

Inducing genotype	Responding genotype	Olfactometer arm (mean ± SE)		n	P level
(a) Inducing genotype remained in the inducing chamber
A	B	AB	0B
Alva	Hulda	4.8 ± 0.26	3.2 ± 0.31	19	0.019
Hulda	Alva	4.9 ± 0.31	3.6 ± 0.28	21	0.033
Alva	Kara	5.1 ± 0.50	3.4 ± 0.39	18	0.088
Kara	Alva	4.6 ± 0.37	3.8 ± 0.32	20	0.247
(b) Inducing genotype remained in the inducing chamber
A	B	AB	BB
Alva	Hulda	5.2 ± 0.36	3.6 ± 0.27	19	0.011
Hulda	Alva	4.7 ± 0.27	3.6 ± 0.22	20	0.033
Alva	Kara	4.3 ± 0.42	4.3 ± 0.35	15	0.950
Kara	Alva	4.2 ± 0.42	4.7 ± 0.37	21	0.444
(c) Inducing genotype was removed from the inducing chamber
A	B	A*B	0B
Alva	Hulda	4.8 ± 0.34	3.0 ± 0.29	23	0.009
Hulda	Alva	4.5 ± 0.50	3.5 ± 0.35	17	0.297
Alva	Kara	4.0 ± 0.43	3.7 ± 0.42	15	0.826
Kara	Alva	4.7 ± 0.40	3.6 ± 0.36	19	0.111
(d) Inducing genotype was removed from the inducing chamber
A	B	A*B	B*B
Alva	Hulda	3.8 ± 0.36	4.3 ± 0.41	17	0.379
Hulda	Alva	4.6 ± 0.35	3.7 ± 0.33	20	0.199
Alva	Kara	4.0 ± 0.30	3.0 ± 0.22	21	0.058
Kara	Alva	4.6 ± 0.30	3.8 ± 0.40	17	0.280

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 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. Blank is a two-chamber cage without any plants

P values from a Wilcoxon matched pairs test, n number of individual C. septempunctata tested against each combination