Functional Analysis of Water Channels in Barley Roots

We identified three genes homologous to water channels in the plasma membrane type subfamily from roots of barley seedlings. These genes were designated HvPIP2;1, HvPIP1;3, and HvPIP1;5 after comparison to Arabidopsis aquaporins. Competitive reverse transcription (RT)-PCR was applied in order to dis...

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Veröffentlicht in:Plant and cell physiology 2002-08, Vol.43 (8), p.885-893
Hauptverfasser: Katsuhara, Maki, Akiyama, Yoshiko, Koshio, Kazuki, Shibasaka, Mineo, Kasamo, Kunihiro
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container_issue 8
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container_title Plant and cell physiology
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creator Katsuhara, Maki
Akiyama, Yoshiko
Koshio, Kazuki
Shibasaka, Mineo
Kasamo, Kunihiro
description We identified three genes homologous to water channels in the plasma membrane type subfamily from roots of barley seedlings. These genes were designated HvPIP2;1, HvPIP1;3, and HvPIP1;5 after comparison to Arabidopsis aquaporins. Competitive reverse transcription (RT)-PCR was applied in order to distinguish and to quantify their transcripts. The HvPIP2;1 transcript was the most abundant among the three in roots. Salt stress (200 mM NaCl) down-regulated HvPIP2;1 (transcript and protein), but had almost no effect on the expressions of HvPIP1;3, or HvPIP1;5. Approximately equal amounts of the transcripts of the three were detected in shoots, and salt stress enhanced the expression of HvPIP2;1 but not of HvPIP1;3, or HvPIP1;5. HvPIP2;1 protein was confirmed to be localized in the plasma membrane. Functional expression of HvPIP2;1 in Xenopus oocytes confirmed that HvPIP2;1 encoded an aquaporin that transports water. This water permeability was reduced by HgCl2, which is a typical water channel inhibitor. This activity was not modified by some inhibitors against protein kinase and protein phosphatase.
doi_str_mv 10.1093/pcp/pcf102
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These genes were designated HvPIP2;1, HvPIP1;3, and HvPIP1;5 after comparison to Arabidopsis aquaporins. Competitive reverse transcription (RT)-PCR was applied in order to distinguish and to quantify their transcripts. The HvPIP2;1 transcript was the most abundant among the three in roots. Salt stress (200 mM NaCl) down-regulated HvPIP2;1 (transcript and protein), but had almost no effect on the expressions of HvPIP1;3, or HvPIP1;5. Approximately equal amounts of the transcripts of the three were detected in shoots, and salt stress enhanced the expression of HvPIP2;1 but not of HvPIP1;3, or HvPIP1;5. HvPIP2;1 protein was confirmed to be localized in the plasma membrane. Functional expression of HvPIP2;1 in Xenopus oocytes confirmed that HvPIP2;1 encoded an aquaporin that transports water. This water permeability was reduced by HgCl2, which is a typical water channel inhibitor. 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source Oxford University Press Journals All Titles (1996-Current); MEDLINE; Elektronische Zeitschriftenbibliothek - Frei zugängliche E-Journals
subjects 3-isobutyle-1-methylxanthine
Adaptation, Physiological - genetics
Adaptation, Physiological - physiology
Algorithms
Amino Acid Sequence
Animals
Aquaporins - antagonists & inhibitors
Aquaporins - genetics
Aquaporins - physiology
Arabidopsis Proteins
Carbazoles - pharmacology
Cell Membrane - metabolism
Cell Membrane Permeability - drug effects
dimethylsulfoxide
dithiothreitol
DMSO
DNA, Complementary - genetics
DNA, Complementary - metabolism
DTT
Female
Gene Expression Regulation, Plant
Hordeum - drug effects
Hordeum - genetics
Hordeum - physiology
IBMX
Indole Alkaloids
Ion Channels - genetics
Keywords: Aquaporin — Barley — Competitive RT-PCR — Salt stress
MBS
Mercuric Chloride - pharmacology
modified Barth’s solution
Molecular Sequence Data
N′-bis(2-ethanesulfonic acid)
Okadaic Acid - pharmacology
Oocytes - physiology
Osmotic Pressure - drug effects
Osmotic water permeability
phenylmethylsulfonylfluoride
Phosphoprotein Phosphatases - antagonists & inhibitors
Phosphorylation
Phylogeny
PIP
piperazine-N
PIPES
Plant Proteins - genetics
Plant Proteins - metabolism
Plant Roots - drug effects
Plant Roots - genetics
Plant Roots - physiology
Plasma membrane Intrinsic Protein
PMSF
Protein Kinase Inhibitors
RACE
rapid amplification of cDNA end
reverse transcription-PCR
RT-PCR
Sequence Homology, Amino Acid
Sodium Chloride - pharmacology
TIP
Tonoplast Intrinsic Protein
Water - pharmacology
Water - physiology
Xenopus laevis
title Functional Analysis of Water Channels in Barley Roots
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