Journal
EMBO REPORTS
Volume 18, Issue 7, Pages 1213-1230Publisher
WILEY
DOI: 10.15252/embr.201643806
Keywords
aluminum; auxin; cytokinin; root growth
Categories
Funding
- Ministry of Science and Technology of China [2015CB942901]
- National Natural Science Foundation of China [31270327, 31470371, 31222005, 31400227]
- Shandong Provincial Funds for Distinguished Young Scholars [2014JQ201408]
- Shandong Provincial Natural Science Foundation project [ZR2014CQ021]
- Grants-in-Aid for Scientific Research [15K01828] Funding Source: KAKEN
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Auxin acts synergistically with cytokinin to control the shoot stem-cell niche, while both hormones act antagonistically to maintain the root meristem. In aluminum (Al) stress-induced root growth inhibition, auxin plays an important role. However, the role of cytokinin in this process is not well understood. In this study, we show that cytokinin enhances root growth inhibition under stress by mediating Al-induced auxin signaling. Al stress triggers a local cytokinin response in the root-apex transition zone (TZ) that depends on IPTs, which encode adenosine phosphate isopentenyl-transferases and regulate cytokinin biosynthesis. IPTs are up-regulated specifically in the root-apex TZ in response to Al stress and promote local cytokinin biosynthesis and inhibition of root growth. The process of root growth inhibition is also controlled by ethylene signaling which acts upstream of auxin. In summary, different from the situation in the root meristem, auxin acts with cytokinin in a synergistic way to mediate aluminum-induced root growth inhibition in Arabidopsis.
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