Table 12.

The main effect and interaction by brightness changes and stress groups of ln(LF).

Measure	Variable	Sum of Squares	Degrees of Freedom	Mean Square	F	p
R1 × R2	Color	0.359	1.000	0.359	0.722	0.399
	Stress Group	3.104	1.000	3.104	6.239	0.016 *
	Color × Stress Group	0.042	1.000	0.042	0.084	0.774
	Error	24.876	50.000	0.498
R3 × R4	Color	0.274	1.000	0.274	0.693	0.409
	Stress Group	3.675	1.000	3.675	9.304	0.004 **
	Color × Stress Group	0.203	1.000	0.203	0.513	0.477
	Error	19.750	50.000	0.395
R5 × R6	Color	0.393	1.000	0.393	1.025	0.316
	Stress Group	3.333	1.000	3.333	8.693	0.005 **
	Color × Stress Group	0.867	1.000	0.867	2.261	0.139
	Error	19.173	50.000	0.383
Y1 × Y2	Color	0.015	1.000	0.015	0.035	0.853
	Stress Group	8.216	1.000	8.216	19.236	0.000 ***
	Color × Stress Group	0.133	1.000	0.133	0.312	0.579
	Error	21.357	50.000	0.427
Y3 × Y4	Color	0.317	1.000	0.317	0.905	0.346
	Stress Group	3.502	1.000	3.502	10.005	0.003 **
	Color × Stress Group	0.002	1.000	0.002	0.006	0.939
	Error	17.503	50.000	0.350
Y5 × Y6	Color	0.125	1.000	0.125	0.372	0.545
	Stress Group	2.801	1.000	2.801	8.363	0.006 **
	Color × Stress Group	0.551	1.000	0.551	1.646	0.205
	Error	16.746	50.000	0.335

p < 0.001 ***, p < 0.01 **, p < 0.05 *.