Abstract:
:The changes in external K+ concentration affect plant root growth. However, the molecular mechanism for perceiving a K+ signal to modulate root growth remains unknown. It is hypothesized that the K+ channel AKT1 is involved in low K+ sensing in the Arabidopsis root and subsequent regulation of root growth. Along with the decline of external K+ concentration, the primary root growth of wild-type plants was gradually inhibited. However, the primary root of the akt1 mutant could still grow under low K+ (LK) conditions. Application of NAA inhibited akt1 root growth, but promoted wild-type root growth under LK conditions. By using the ProDR5:GFP and ProPIN1:PIN1-GFP lines, we found that LK treatment reduced auxin accumulation in wild-type root tips by degrading PIN1 proteins, which did not occur in the akt1 mutant. The LK-induced PIN1 degradation may be due to the inhibition of vesicle trafficking of PIN1 proteins. In conclusion, our findings indicate that AKT1 is required for an Arabidopsis response to changes in external K+ , and subsequent regulation of K+ -dependent root growth by modulating PIN1 degradation and auxin redistribution in the root.
journal_name
J Integr Plant Bioljournal_title
Journal of integrative plant biologyauthors
Li J,Wu WH,Wang Ydoi
10.1111/jipb.12575subject
Has Abstractpub_date
2017-12-01 00:00:00pages
895-909issue
12eissn
1672-9072issn
1744-7909journal_volume
59pub_type
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