Journal
FRONTIERS IN PLANT SCIENCE
Volume 8, Issue -, Pages 1-8Publisher
FRONTIERS MEDIA SA
DOI: 10.3389/fpls.2017.00272
Keywords
manganese (Mn) toxicity; auxin accumulation; auxin efflux carriers; primary root growth; Arabidopsis
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Funding
- Key Project of State Key Laboratory of Desert and Oasis Ecology
- Xinjiang Institute of Ecology and Geography of Chinese Academy of Sciences
- National Key Research and Development Program of China [2016YFC0501901]
- China National Natural Sciences Foundation [31170228, 31272239, 31260127]
- Yunnan Province Foundation [2014HB043]
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Mn toxicity inhibits both primary root (PR) growth and lateral root development. However, the mechanism underlying Mn-mediated root growth inhibition remains to be further elucidated. Here, we investigated the role of auxin in Mn-mediated inhibition of PR growth in Arabidopsis using physiological and genetic approaches. Mn toxicity inhibits PR elongation by reducing meristematic cell division potential. Mn toxicity also reduced auxin levels in root tips by reducing IAA biosynthesis and down-regulating the expression of auxin efflux carriers PIN4 and PIN7. Loss of function pin4 and pin7 mutants showed less inhibition of root growth than col-0 seedlings. These results indicated that this inhibitory effect of Mn toxicity on PR growth was mediated by affecting auxin biosynthesis and the expression of auxin efflux transporters PIN4 and PIN7.
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