Table 1.

Occurrence and distribution of sequences annotated as similar to RKS (receptor kinase‐like SERK) and SERK (somatic embryogenesis receptor kinase) across the main leucine‐rich repeat receptor‐like kinase II (LRR‐RLKII) clades found in this study. RKS types are designated according to similarity to types in Schmidt et al. (2009). The SERK and NSP interacting kinase (NIK) types are based on NCBI annotation files

LRR‐RLKII clade	No. of terminals	Similar to RKS types	SERK types	Non‐SERK proteins
1	405	1, 4, 5, 7, 9, 11, 14	1, 2	‘NIK1’, ‘NIK2’
2	132	1, 5, 7, 9, 14	–	‘NIK3’
3	102	5	1, 2	‘Poap SERK‐like 1’, ‘Poap SERK like 2’
4	280	2, 3, 6	1, 2	‘AtLRRRLK1, AtLRRRLK2, ‘Ta SERK‐like’, ‘OS SERK‐like 1’
5	404	0, 8, 10, 12, 13, 16	1, 2, 3, 4, 5, BAK1