Local regulation of auxin transport in root-apex transition zone mediates aluminium-induced Arabidopsis root-growth inhibition.
2021
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 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 this 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 co-ordinately regulate the 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, these studies
provide insight about 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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