Journal
PLANT JOURNAL
Volume 108, Issue 1, Pages 55-66Publisher
WILEY
DOI: 10.1111/tpj.15424
Keywords
aluminium; auxin transport; PIN1; root growth; root-apex transition zone
Categories
Funding
- National Natural Science Foundation of China [31670259, 31872655, 32070303, 31400227]
- Shandong Provincial Key Research and Development Program [2019GSF107005]
- Shandong Provincial Natural Science Foundation project [ZR2014CQ021]
- Joint NSFC-ISF Research Grant [32061143005]
- European Regional Development Fund-Project [CZ.02.1.01/0.0/0.0/16_019/0000738]
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The study revealed that PIN and AUX1/LAX proteins were up-regulated in the root-apex transition zone in response to aluminum stress, coordinating the local auxin accumulation and root growth inhibition in that region. Moreover, the up-regulation of PIN1 under aluminum stress was co-regulated by ethylene and auxin.
Aluminium (Al) stress is a major limiting factor for worldwide crop production in acid soils. In Arabidopsis thaliana, the TAA1-dependent local auxin biosynthesis in the root-apex transition zone (TZ), the major perception site for Al toxicity, is crucial for the Al-induced root-growth inhibition, while the mechanism underlying Al-regulated auxin accumulation in the TZ is not fully understood. In the present study, the role of auxin transport in Al-induced local auxin accumulation in the TZ and root-growth inhibition was investigated. Our results showed that PIN-FORMED (PIN) proteins such as PIN1, PIN3, PIN4 and PIN7 and AUX1/LAX proteins such as AUX1, LAX1 and LAX2 were all ectopically up-regulated in the root-apex TZ in response to Al stress and coordinately regulated local auxin accumulation in the TZ and root-growth inhibition. The ectopic up-regulation of PIN1 in the TZ under Al stress was regulated by both ethylene and auxin, with auxin signalling acting downstream of ethylene. Al-induced PIN1 up-regulation and auxin accumulation in the root-apex TZ was also regulated by the calossin-like protein BIG. Together, our results provide insight into how Al stress induces local auxin accumulation in the TZ and root-growth inhibition through the local regulation of auxin transport.
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