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231224s2016 xx |||||o 00| ||eng c |
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|a 10.1093/jxb/erv493
|2 doi
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|a pubmed24n1417.xml
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|a (DE-627)NLM254787975
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|a (NLM)26585227
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|a DE-627
|b ger
|c DE-627
|e rakwb
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|a eng
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| 100 |
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|a Zhu, Min
|e verfasserin
|4 aut
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|a Nax loci affect SOS1-like Na+/H+ exchanger expression and activity in wheat
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|c 2016
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|a Text
|b txt
|2 rdacontent
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|a ƒaComputermedien
|b c
|2 rdamedia
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|a ƒa Online-Ressource
|b cr
|2 rdacarrier
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|a Date Completed 25.10.2016
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|a Date Revised 24.05.2024
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|a published: Print-Electronic
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|a Citation Status MEDLINE
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|a © The Author 2015. Published by Oxford University Press on behalf of the Society for Experimental Biology.
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|a Salinity stress tolerance in durum wheat is strongly associated with a plant's ability to control Na(+) delivery to the shoot. Two loci, termed Nax1 and Nax2, were recently identified as being critical for this process and the sodium transporters HKT1;4 and HKT1;5 were identified as the respective candidate genes. These transporters retrieve Na(+) from the xylem, thus limiting the rates of Na(+) transport from the root to the shoot. In this work, we show that the Nax loci also affect activity and expression levels of the SOS1-like Na(+)/H(+) exchanger in both root cortical and stelar tissues. Net Na(+) efflux measured in isolated steles from salt-treated plants, using the non-invasive ion flux measuring MIFE technique, decreased in the sequence: Tamaroi (parental line)>Nax1=Nax2>Nax1:Nax2 lines. This efflux was sensitive to amiloride (a known inhibitor of the Na(+)/H(+) exchanger) and was mirrored by net H(+) flux changes. TdSOS1 relative transcript levels were 6-10-fold lower in Nax lines compared with Tamaroi. Thus, it appears that Nax loci confer two highly complementary mechanisms, both of which contribute towards reducing the xylem Na(+) content. One enhances the retrieval of Na(+) back into the root stele via HKT1;4 or HKT1;5, whilst the other reduces the rate of Na(+) loading into the xylem via SOS1. It is suggested that such duality plays an important adaptive role with greater versatility for responding to a changing environment and controlling Na(+) delivery to the shoot
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|a Journal Article
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|a Research Support, Non-U.S. Gov't
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|a HKT transporter
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|a potassium
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|a salinity stress
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|a sequestration
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|a sodium
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|a xylem loading.
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|a Ions
|2 NLM
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|a Plant Proteins
|2 NLM
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|a RNA, Messenger
|2 NLM
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|a Sodium-Hydrogen Exchangers
|2 NLM
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|a Sodium Chloride
|2 NLM
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|a 451W47IQ8X
|2 NLM
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| 650 |
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|a Potassium
|2 NLM
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|a RWP5GA015D
|2 NLM
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| 700 |
1 |
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|a Shabala, Lana
|e verfasserin
|4 aut
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|a Cuin, Tracey A
|e verfasserin
|4 aut
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| 700 |
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|a Huang, Xin
|e verfasserin
|4 aut
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| 700 |
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|a Zhou, Meixue
|e verfasserin
|4 aut
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|a Munns, Rana
|e verfasserin
|4 aut
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| 700 |
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|a Shabala, Sergey
|e verfasserin
|4 aut
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| 773 |
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|i Enthalten in
|t Journal of experimental botany
|d 1985
|g 67(2016), 3 vom: 01. Feb., Seite 835-44
|w (DE-627)NLM098182706
|x 1460-2431
|7 nnns
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| 773 |
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|g volume:67
|g year:2016
|g number:3
|g day:01
|g month:02
|g pages:835-44
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|u http://dx.doi.org/10.1093/jxb/erv493
|3 Volltext
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|h 835-44
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