Table 1.

RNA samples used for assessment of the stability of the candidate reference genes

Plant phenotype	Herbicide application			Total
	BEFORE treatment	AFTER treatment
		+2.5H	+6H
SENSITIVE	1	2	2	5
RESISTANT	4	5	5	14
Total	5	7	7	19

Samples were assigned to five subsets according to plant phenotype or to the time after herbicide application. Subsets containing samples collected at the same time (BEFORE, + 2.5H or + 6H) enabled to assess gene stability between phenotypes (i.e. phenotype effect). Subsets containing samples from plants with a same phenotype (SENSITIVE or RESISTANT) enabled to assess the effect of the time after herbicide application on gene stability.