Table 1.

MicroRNAs and ta-siRNAs targeting RNAs for secondary siRNA production.

	nt	5′	AGO	Hits	Sec-siRNA source	RNA Targets	Model	References
miR173	22	U	1	1	TAS1a,b,c,2	Pentatricopeptide repeat proteins	A.t.	[24, 25, 83]
miR390	21		7	2	TAS3	Auxin response factors	Plants	[84–86]
miR828	22	U	1	1	TAS4	MYB transcription factors		[87, 88]
miR161/miR400	21		1	2	PPR clade	PPR network	A.t.	[89, 90]
miR393	22		1	1	siTAAR	TAAR network		[89, 91, 92]
miR472	22		1	1	NBS-LRR	NBS-LRR	A.t.	[89]
miR482	22		1	2	NBS-LRR	NBS-LRR	Tomato	[93]
miR780/miR856	21				ATCHX18			[89]
miR2118	22	U	1	1	NBS-LRR; SGS3		Plants	[93, 94]
miR6019	22				NBS-LRR (N)		Tobacco	[95]
miR6020	21				NBS-LRR (N)		Tobacco	[95]
miR2109	22	U	1	1	NBS-LRR		Medicago	[94]
miR1507	22	C	1	1	NBS-LRR; DCL2		Medicago	[94]
miR1509	22		1	2			Medicago	[94]
miR5754	22	U	1	1			Medicago	[94]
miR156/miR172	21/21	U/A	1/1	2	AP2-like		Medicago	[94]
tas1c D6−	21, 22	U	1, 2, 4		TAS 1a,b,c, TAS2		A.t.	[96]
tas1c D10−	21	A	2		TAS1c		A.t.	[96]
tas1c D10−	22	U	1		TAS1c		A.t.	[96]
tas3 D2−	21				TAS3		Leguminosae	[97]
miR168	22			1	AGO1		A.t., Tomato	[93, 98]