Figure - PMC

Skip to main content

An official website of the United States government

Here's how you know

Here's how you know

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you've safely connected to the .gov website. Share sensitive information only on official, secure websites.

View full-text article in PMC

. 2010 Sep 7;22(9):2956–2969. doi: 10.1105/tpc.110.074856

Search in PMC
Search in PubMed
View in NLM Catalog
Add to search

© 2010 American Society of Plant Biologists

Open Access articles can be viewed online without a subscription.

PMC Copyright notice

Figure 8. — A Model of the Homeostatic Feedback Loop Regulating IAA and Cytokinin Concentrations in the Arabidopsis Root Apex.

Cytokinin (CK) acts as a positive regulator of auxin (IAA) biosynthesis in the root apex, possibly by ATR1 coinduction of the CYP79B2/B3 and NIT3 genes. On the other hand, auxin can act as a repressor of cytokinin biosynthesis via downregulation of specific IPT genes. Both auxin and cytokinin signaling is important for these interactions, and our data suggest that specific auxin/IAA genes (IAA17/AXR3 and IAA3/SHY2) and cytokinin signaling components (AHK4 and ARRs) are involved. Changes in auxin transport (PIN efflux carriers) and in the degradation of auxin (GH3s) and cytokinin (CKXs) may also play important roles in the modulation of the response.