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. 2013 Jun 6;8(6):e65319. doi: 10.1371/journal.pone.0065319

Figure 7. Expression of putative cytokinin biosynthesis and signaling genes in soybean.

Figure 7

The rate-limiting step of cytokinin biosynthesis is catalyzed by ATP/ADP-ISOPENTENYLTRASNFERASE (IPT) gene family as indicated by the schematic diagram [60] on the left. Transmembrane histidine kinases (HK3, HK4) are cytokinin receptors that are auto-phosphorylated following the initial cytokinin perception. These then transfer the phosphate group to members of the HISTIDINE PHOSPHOTRANSFER proteins (HP1, 4, 6) family. HPs subsequently translocate to the nucleus to phosphorylate the RESPONSE REGULATORs (ARRs) proteins of either type-A or type-B. Activated type-A and type-B RRs negatively and positively regulate cytokinin signaling, respectively. Expression level is as in Figure 3.