Table 1.

Rows of cytokinin affinity for the receptors from Arabidopsis and corn

Species	Receptor**	Cytokinin affinity rows**
Zea mays	ZmHK1	iP ≥ BA >> tZ ≥ cZ >> DZ >> Ade
Arabidopsis thaliana	CRE1/AHK4	iP ≥ tZ > BA > DZ > cZ >> Ade
Zea mays	ZmHK2	tZ ≥ iP > DZ > BA > cZ >> Ade
Arabidopsis thaliana	AHK3	tZ > DZ > iP > cZ > BA >> Ade
Zea mays	ZmHK3a	iP > tZ > BA > cZ >> DZ >> Ade
Arabidopsis thaliana	AHK2	iP > tZ > BA > cZ > DZ >> Ade

* Orthologous receptors are grouped pairwise.

** Cytokinins: iP – isopentenyladenine; BA – N ⁶ -benzyladenine; tZ – trans -zeatin; cZ – cis -zeatin; DZ – dihydrozeatin. Ade – adenine.