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Amino acids regulate salinity-induced potassium efflux in barley root epidermis


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Cuin, TA and Shabala, SN 2007 , 'Amino acids regulate salinity-induced potassium efflux in barley root epidermis' , Planta, vol. 225, no. 3 , pp. 753-761 , doi: 10.1007/s00425-006-0386-x.

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The amino acid content increases substantially
in salt-stressed plants. The physiological relevance
of this phenomenon remains largely unknown.
Using the MIFE ion Xux measuring technique, we
studied the eVects of physiologically relevant concentrations
of 26 amino acids on NaCl-induced K+ Xux
from barley root epidermis. We show that 21 (of 26)
amino acids caused a signiWcant mitigation of the
NaCl-induced K+ eZux, while valine and ornithine
substantially enhanced the detrimental eVects of salinity
on K+ homeostasis. Our results suggest that physiologically
relevant concentrations of free amino acids
might contribute to plant adaptive responses to salinity
by regulating K+ transport across the plasma membrane,
thus enabling maintenance of an optimal K+/
Na+ ratio as opposed to being merely a symptom of
plant damage by stress. Investigating the speciWc mechanisms
of such amelioration remains a key issue for
future studies.

Item Type: Article
Authors/Creators:Cuin, TA and Shabala, SN
Keywords: Amino acids - Barley - Membrane - Potassium homeostasis - Stress - Adaptation
Journal or Publication Title: Planta
Publisher: Springer-Verlag
ISSN: 0032-0935
DOI / ID Number: 10.1007/s00425-006-0386-x
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