Synergistic action of auxin and cytokinin mediates aluminum‐induced root growth inhibition in Arabidopsis |
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| Authors: | Jiajia Liu Bing Zhang Wenjing Meng Bruno Müller Ken‐ichiro Hayashi Xiansheng Zhang Zhong Zhao Ive De Smet Zhaojun Ding |
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| Affiliation: | 1. The Key Laboratory of Plant Cell Engineering and Germplasm Innovation, Ministry of Education, College of Life Science, Shandong University, Jinan, China;2. State Key Laboratory of Crop Biology, College of Life Sciences, Shandong Agricultural University, Taian, China;3. Institute of Plant Biology, University of Zurich, Zurich, Switzerland;4. Department of Biochemistry, Okayama University of Science, Okayama, Japan;5. School of Life Sciences, University of Science and Technology of China, Hefei, China;6. Department of Plant Biotechnology and Bioinformatics, Ghent University, Ghent, Belgium;7. VIB Center for Plant Systems Biology, Ghent, Belgium |
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| Abstract: | 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 isopentenyltransferases 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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| Keywords: | aluminum auxin cytokinin root growth |
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