期刊
PLANT CELL
卷 26, 期 3, 页码 862-875出版社
AMER SOC PLANT BIOLOGISTS
DOI: 10.1105/tpc.113.119495
关键词
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资金
- Biotechnology and Biological Sciences Research Council (BBSRC)
- Engineering and Physical Sciences Research Council
- Leverhulme Trust
- Al-Tajir World of Islam Trust
- National Science Foundation [DBI0820755]
- Royal Society
- Wolfson Foundation
- BBSRC Professorial Research Fellowship
- Direct For Biological Sciences
- Div Of Molecular and Cellular Bioscience [1158181] Funding Source: National Science Foundation
- Biotechnology and Biological Sciences Research Council [BB/D019613/1, BB/J009717/1, BB/H020314/1] Funding Source: researchfish
- BBSRC [BB/D019613/1, BB/H020314/1] Funding Source: UKRI
Auxin is a key regulator of plant growth and development. Within the root tip, auxin distribution plays a crucial role specifying developmental zones and coordinating tropic responses. Determining how the organ-scale auxin pattern is regulated at the cellular scale is essential to understanding how these processes are controlled. In this study, we developed an auxin transport model based on actual root cell geometries and carrier subcellular localizations. We tested model predictions using the DII-VENUS auxin sensor in conjunction with state-of-the-art segmentation tools. Our study revealed that auxin efflux carriers alone cannot create the pattern of auxin distribution at the root tip and that AUX1/LAX influx carriers are also required. We observed that AUX1 in lateral root cap (LRC) and elongating epidermal cells greatly enhance auxin's shootward flux, with this flux being predominantly through the LRC, entering the epidermal cells only as they enter the elongation zone. We conclude that the nonpolar AUX1/LAX influx carriers control which tissues have high auxin levels, whereas the polar PIN carriers control the direction of auxin transport within these tissues.
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