Table 1. Genes selected for RISH analysis.

AGI code	Name/description	FC, 2 days	FC, 5 days	Cambium expression (RISH)	Reference
AT5G05160	RUL1	2.25	12.91	✓	this work
AT1G46480	WOX4	0.92	4.23	✓	[28], [29]
AT1G52340	ABA2	1.46	3.83	-	[47]
AT5G61480	PXY	1.56	3.77	✓	[24]-[26]
AT4G32880	ATHB8	1.06	3.68	✓	[43]
AT5G51350	MOL1	1.45	3.31	✓	this work
AT5G39340	AHP3	1.84	3.17	no probe	[71]
AT5G57110	ACA8	1.56	2.94	✓	[46]
AT2G26070	RTE1	1.83	2.89	-	[48]
AT3G45590	ATSEN1	1.72	2.85	no probe	[72]
AT2G27040	AGO4	1.46	2.61	✓	[73]
AT5G57130	unknown protein	1.33	2.56	✓
AT1G11130	SCM	1.72	2.30	✓	[45]
AT2G41070	ATBZIP12	1.47	2.12	-

ATHB8 and WOX4 were classified as ‘late’ but were included because of their roles as a classical marker for procambium identity [43] and as an essential cambium regulator [29], respectively. For WOX4, values are based on qRT-PCR results, for the other genes on micro-array data. FC  =  fold change.