Species	Reference gene ID	Possible function	Papers / DOI
Arabidopsis	At2g01830	Cytokinins (CK) receptor related to bacterial two-component regulators.	The Arabidopsis sensor His-kinase, AHk4, can respond to cytokinins.; 2001; DOI: 10.1093/pcp/pce037; PMID: 11230563; https://pubmed.ncbi.nlm.nih.gov/11230563/ | Identification of CRE1 as a cytokinin receptor from Arabidopsis.; 2001; DOI: 10.1038/35059117; PMID: 11234017; https://pubmed.ncbi.nlm.nih.gov/11234017/ | The AHK4 gene involved in the cytokinin-signaling pathway as a direct receptor molecule in Arabidopsis thaliana.; 2001; DOI: 10.1093/pcp/pce094; PMID: 11479382; https://pubmed.ncbi.nlm.nih.gov/11479382/ | The Arabidopsis AHK4 histidine kinase is a cytokinin-binding receptor that transduces cytokinin signals across the membrane.; 2001; DOI: 10.1093/pcp/pce127; PMID: 11577198; https://pubmed.ncbi.nlm.nih.gov/11577198/ | Characterization of the ARR15 and ARR16 response regulators with special reference to the cytokinin signaling pathway mediated by the AHK4 histidine kinase in roots of Arabidopsis thaliana.; 2002; DOI: 10.1093/pcp/pcf121; PMID: 12354925; https://pubmed.ncbi.nlm.nih.gov/12354925/ | Mutations at CRE1 impair cytokinin-induced repression of phosphate starvation responses in Arabidopsis.; 2002; DOI: 10.1046/j.1365-313x.2002.01431.x; PMID: 12410813; https://pubmed.ncbi.nlm.nih.gov/12410813/ | Interallelic complementation at the Arabidopsis CRE1 locus uncovers independent pathways for the proliferation of vascular initials and canonical cytokinin signalling.; 2004; DOI: 10.1111/j.1365-313x.2004.02023.x; PMID: 15053761; https://pubmed.ncbi.nlm.nih.gov/15053761/ | A novel regulatory pathway of sulfate uptake in Arabidopsis roots: implication of CRE1/WOL/AHK4-mediated cytokinin-dependent regulation.; 2004; DOI: 10.1111/j.1365-313x.2004.02079.x; PMID: 15144379; https://pubmed.ncbi.nlm.nih.gov/15144379/ | Histidine kinase homologs that act as cytokinin receptors possess overlapping functions in the regulation of shoot and root growth in Arabidopsis.; 2004; DOI: 10.1105/tpc.021477; PMID: 15155880; https://pubmed.ncbi.nlm.nih.gov/15155880/ | In planta functions of the Arabidopsis cytokinin receptor family.; 2004; DOI: 10.1073/pnas.0402887101; PMID: 15166290; https://pubmed.ncbi.nlm.nih.gov/15166290/ | Two cytokinin receptors of Arabidopsis thaliana, CRE1/AHK4 and AHK3, differ in their ligand specificity in a bacterial assay.; 2004; DOI: 10.1093/pcp/pch132; PMID: 15509853; https://pubmed.ncbi.nlm.nih.gov/15509853/ | Topolins and hydroxylated thidiazuron derivatives are substrates of cytokinin O-glucosyltransferase with position specificity related to receptor recognition.; 2005; DOI: 10.1104/pp.104.057174; PMID: 15728338; https://pubmed.ncbi.nlm.nih.gov/15728338/ | Interaction between phosphate-starvation, sugar, and cytokinin signaling in Arabidopsis and the roles of cytokinin receptors CRE1/AHK4 and AHK3.; 2005; DOI: 10.1104/pp.105.060517; PMID: 15923327; https://pubmed.ncbi.nlm.nih.gov/15923327/ | A live cell hormone-binding assay on transgenic bacteria expressing a eukaryotic receptor protein.; 2005; DOI: 10.1016/j.ab.2005.09.012; PMID: 16246292; https://pubmed.ncbi.nlm.nih.gov/16246292/ | Cytokinin receptors are required for normal development of auxin-transporting vascular tissues in the hypocotyl but not in adventitious roots.; 2006; DOI: 10.1093/pcp/pci240; PMID: 16357038; https://pubmed.ncbi.nlm.nih.gov/16357038/ | Arabidopsis cytokinin receptor mutants reveal functions in shoot growth, leaf senescence, seed size, germination, root development, and cytokinin metabolism.; 2006; DOI: 10.1105/tpc.105.037796; PMID: 16361392; https://pubmed.ncbi.nlm.nih.gov/16361392/ | Cytokinins regulate a bidirectional phosphorelay network in Arabidopsis.; 2006; DOI: 10.1016/j.cub.2006.04.030; PMID: 16753566; https://pubmed.ncbi.nlm.nih.gov/16753566/ | Biochemical characteristics and ligand-binding properties of Arabidopsis cytokinin receptor AHK3 compared to CRE1/AHK4 as revealed by a direct binding assay.; 2006; DOI: 10.1093/jxb/erl179; PMID: 17075078; https://pubmed.ncbi.nlm.nih.gov/17075078/ | The floral volatile, methyl benzoate, from snapdragon (Antirrhinum majus) triggers phytotoxic effects in Arabidopsis thaliana.; 2007; DOI: 10.1007/s00425-006-0464-0; PMID: 17216481; https://pubmed.ncbi.nlm.nih.gov/17216481/ | Identification of amino acid substitutions that render the Arabidopsis cytokinin receptor histidine kinase AHK4 constitutively active.; 2007; DOI: 10.1093/pcp/pcm145; PMID: 17956858; https://pubmed.ncbi.nlm.nih.gov/17956858/ | Cytokinin receptors are involved in alkamide regulation of root and shoot development in Arabidopsis.; 2007; DOI: 10.1104/pp.107.107953; PMID: 17965178; https://pubmed.ncbi.nlm.nih.gov/17965178/ | Functional analysis of AHK1/ATHK1 and cytokinin receptor histidine kinases in response to abscisic acid, drought, and salt stress in Arabidopsis.; 2007; DOI: 10.1073/pnas.0706547105; PMID: 18077346; https://pubmed.ncbi.nlm.nih.gov/18077346/ | Cytokinins negatively regulate the root iron uptake machinery in Arabidopsis through a growth-dependent pathway.; 2008; DOI: 10.1111/j.1365-313x.2008.03502.x; PMID: 18397377; https://pubmed.ncbi.nlm.nih.gov/18397377/ | Mechanism-based inhibitors of cytokinin oxidase/dehydrogenase attack FAD cofactor.; 2008; DOI: 10.1016/j.jmb.2008.05.044; PMID: 18571199; https://pubmed.ncbi.nlm.nih.gov/18571199/ | The role of auxins and cytokinins in the mutualistic interaction between Arabidopsis and Piriformospora indica.; 2008; DOI: 10.1094/mpmi-21-10-1371; PMID: 18785832; https://pubmed.ncbi.nlm.nih.gov/18785832/ | The purine derivative PI-55 blocks cytokinin action via receptor inhibition.; 2009; DOI: 10.1111/j.1742-4658.2008.06777.x; PMID: 19032596; https://pubmed.ncbi.nlm.nih.gov/19032596/
Arabidopsis	At5g35750	Cytokinins (CK) receptor related to bacterial two-component regulators.	Histidine kinase homologs that act as cytokinin receptors possess overlapping functions in the regulation of shoot and root growth in Arabidopsis.; 2004; DOI: 10.1105/tpc.021477; PMID: 15155880; https://pubmed.ncbi.nlm.nih.gov/15155880/ | In planta functions of the Arabidopsis cytokinin receptor family.; 2004; DOI: 10.1073/pnas.0402887101; PMID: 15166290; https://pubmed.ncbi.nlm.nih.gov/15166290/ | Arabidopsis cytokinin receptor mutants reveal functions in shoot growth, leaf senescence, seed size, germination, root development, and cytokinin metabolism.; 2006; DOI: 10.1105/tpc.105.037796; PMID: 16361392; https://pubmed.ncbi.nlm.nih.gov/16361392/ | Cytokinins regulate a bidirectional phosphorelay network in Arabidopsis.; 2006; DOI: 10.1016/j.cub.2006.04.030; PMID: 16753566; https://pubmed.ncbi.nlm.nih.gov/16753566/ | Identification of amino acid substitutions that render the Arabidopsis cytokinin receptor histidine kinase AHK4 constitutively active.; 2007; DOI: 10.1093/pcp/pcm145; PMID: 17956858; https://pubmed.ncbi.nlm.nih.gov/17956858/ | Cytokinin receptors are involved in alkamide regulation of root and shoot development in Arabidopsis.; 2007; DOI: 10.1104/pp.107.107953; PMID: 17965178; https://pubmed.ncbi.nlm.nih.gov/17965178/ | Functional analysis of AHK1/ATHK1 and cytokinin receptor histidine kinases in response to abscisic acid, drought, and salt stress in Arabidopsis.; 2007; DOI: 10.1073/pnas.0706547105; PMID: 18077346; https://pubmed.ncbi.nlm.nih.gov/18077346/ | The role of auxins and cytokinins in the mutualistic interaction between Arabidopsis and Piriformospora indica.; 2008; DOI: 10.1094/mpmi-21-10-1371; PMID: 18785832; https://pubmed.ncbi.nlm.nih.gov/18785832/ | The histidine kinases CYTOKININ-INDEPENDENT1 and ARABIDOPSIS HISTIDINE KINASE2 and 3 regulate vascular tissue development in Arabidopsis shoots.; 2009; DOI: 10.1105/tpc.109.066696; PMID: 19622803; https://pubmed.ncbi.nlm.nih.gov/19622803/ | Cytokinin overproduction-caused alteration of flower development is partially mediated by CUC2 and CUC3 in Arabidopsis.; 2010; DOI: 10.1016/j.gene.2009.11.003; PMID: 19913077; https://pubmed.ncbi.nlm.nih.gov/19913077/ | A subset of cytokinin two-component signaling system plays a role in cold temperature stress response in Arabidopsis.; 2010; DOI: 10.1074/jbc.m109.096644; PMID: 20463025; https://pubmed.ncbi.nlm.nih.gov/20463025/
Rice	Os03g0717700	Cytokinin receptor related to bacterial two-component regulators.	No verified direct reference in this release
Rice	Os02g0738400	Cytokinin receptor related to bacterial two-component regulators.	No verified direct reference in this release