Table 2.

Classes of CRKs, based on the number of stress-antifungal (DUF 26) domains, found in 35 land plants.

Class no	Class Name	Functional domains	Total no. of genes
I	sdCRRSP	Single stress-antifungal domain	143
II	sdCRRSPD	sdCRRSP with N-terminal DUF domain	5
III	sdCRRSPdS	sdCRRSP with double sugar transporter domain	1
IV	ddCRRSP	Double stress-antifungal domain	521
V	ddCRRSPD	ddCRRSP with N-terminal DUF3403 domain	10
VI	ddCRRSPP	ddCRRSP with N-terminal PRIMA1 domain	1
VII	tdCRRSP	Triple stress-antifungal domain	2
VIII	sdCRK	Single stress-antifungal domain with N-terminal kinase domain	58
IX	sdCRKD	dCRK with N-terminal DUF3403 domain	2
X	ddCRK	Double stress-antifungal domain with N-terminal kinase domain	947
XI	ddCRKD	ddCRK with DUF3403 domain	49
XII	ddCRKF	ddCRK with N-terminal FYVE domain	2
XIII	ddCRKP	ddCRK with N-terminal PRIMA1 domain	2
XIV	ddCRKS	ddCRK with N-terminal sugar transporter domain	2
XV	ddCRdK	ddCRK with special fungal kinase domains	27
XVI	tdCRK	Triple stress-antifungal domain with single kinase domain	2
XVII	tdCRdK	Triple stress-antifungal domain with single kinase domain and special fungal kinase domains	1
XVIII	qdCRK	Tetra stress-antifungal domain with single kinase domain	15
XIX	qdCRKD	Tetra stress-antifungal domain with single kinase domain and DUF3403 domain	4