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|Title: ||Rice OsHKT2;1 transporter mediates large Na+ influx component into K+-starved roots for growth|
|Authors: ||COSTA, ALEX|
|Abstract: ||Excessive accumulation of sodium in plants causes toxicity.
No mutation that greatly diminishes sodium (Naþ)
influx into plant roots has been isolated. The OsHKT2;1
(previously named OsHKT1) transporter from rice functions
as a relatively Naþ-selective transporter in heterologous
expression systems, but the in vivo function
of OsHKT2;1 remains unknown. Here, we analyzed
transposon-insertion rice lines disrupted in OsHKT2;1.
Interestingly, three independent oshkt2;1-null alleles exhibited
significantly reduced growth compared with wildtype
plants under low Naþ and Kþ starvation conditions.
The mutant alleles accumulated less Naþ, but not less Kþ,
in roots and shoots. OsHKT2;1 was mainly expressed in
the cortex and endodermis of roots. 22Naþ tracer influx
experiments revealed that Naþ influx into oshkt2;1-null
roots was dramatically reduced compared with wild-type
plants. A rapid repression of OsHKT2;1-mediated Naþ
influx and mRNA reduction were found when wild-type
plants were exposed to 30mM NaCl. These analyses
demonstrate that Naþ can enhance growth of rice under
Kþ starvation conditions, and that OsHKT2;1 is the central
transporter for nutritional Naþ uptake into Kþ-starved
|MIUR subjects: ||BIO/11 - Biologia Molecolare|
|Publication date: ||May-2007|
|Digital Object Identifier (DOI): ||10.1038/sj.emboj.7601732|
|Citation: ||Rice OsHKT2;1 transporter mediates large Na+ influx component into K+-starved roots for growth / T. Horie, A. Costa, T. Houn
Kim, M. Jung Han, R. Horie, H.Y.
Leung, A. Miyao, H. Hirochika,
G. An, J.I. Schroeder. - In: The EMBO Journal. - ISSN 0261-4189. - ISSN 1460-2075. - 26:12(2007 May), pp. 3003-3014.|
|ISI identifier: ||000248038200017|
|Scopus identifier: ||34250885760|
|Type: ||Article (author)|
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