Table 1. Results from GLMMs testing the effect of UV radiation, population and their interaction on the production of anthocyanins and UV-absorbing compounds in each plant tissue.

		Anthocyanins				UV-absorbing compounds
Tissue	Source of variation	SS	Denominator d.f.	F	P	SS	Denominator d.f.	F	P
Petals	Treatment	0.670	46.62	7.968	0.007	0.019	38.78	1.469	0.233
	Population	0.033	19.79	0.396	0.536	0.477	42.86	36.15	<0.001
	Treatm. x Pop.	0.096	47.86	1.140	0.291	0.001	38.68	0.004	0.949
Calyces	Treatment	0.674	44.48	3.729	0.059	1.013	44.39	37.27	<0.001
	Population	0.121	43.22	0.667	0.419	0.606	46.06	22.29	<0.001
	Treatm. x Pop.	0.231	45.11	1.276	0.265	0.018	44.94	0.647	0.426
Leaves	Treatment	0.007	46.70	0.176	0.677	0.368	49.00	5.145	0.028
	Population	0.078	23.18	1.899	0.181	1.166	49.00	16.28	<0.001
	Treatm. x Pop.	0.199	48.29	4.840	0.033	0.023	49.00	0.327	0.570
Stems	Treatment	1.572	44.65	8.527	0.005	1.295	46.10	6.203	0.016
	Population	0.035	49.27	0.191	0.664	0.049	42.77	0.237	0.629
	Treatm. x Pop.	0.339	45.22	1.837	0.182	0.008	46.92	0.041	0.841

Significant P-values were highlighted in bold.

Numerator d.f. = 1 in all cases.