Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
27
pubmed:dateCreated
2004-7-8
pubmed:abstractText
Electroneutral monovalent cation/proton antiport across the chloroplast envelope has been shown previously to have an important regulatory effect on stromal pH and thereby on photosynthetic carbon reduction. Here we report that an Arabidopsis nuclear gene, AtCHX23, encodes a putative Na(+)(K(+))/H(+) exchanger and functions in the adjustment of pH in the cytosol and possibly in maintaining a high pH level in the chloroplast stroma. The AtCHX23 protein is localized in the chloroplast envelope. Plastids from chx23 mutants had straight thylakoids but lacked grana lamellae. chx23 mutant leaves were pale yellow and had a much reduced chlorophyll content. The chlorophyll content of chx23 was increased by growing in medium at low (4.0) pH and decreased by growing at high (7.0) pH. The cytosolic pH in the leaves of the mutant was significantly higher than that in the wild type. chx23 mutants displayed a high sensitivity to NaCl. Together, these data indicate that CHX23 is a probable chloroplast Na(+)(K(+))/H(+) exchanger important for pH homeostasis and chloroplast development and function.
pubmed:grant
pubmed:commentsCorrections
http://linkedlifedata.com/resource/pubmed/commentcorrection/15220473-10455050, http://linkedlifedata.com/resource/pubmed/commentcorrection/15220473-10740299, http://linkedlifedata.com/resource/pubmed/commentcorrection/15220473-10748531, http://linkedlifedata.com/resource/pubmed/commentcorrection/15220473-10781109, http://linkedlifedata.com/resource/pubmed/commentcorrection/15220473-10823923, http://linkedlifedata.com/resource/pubmed/commentcorrection/15220473-11154338, http://linkedlifedata.com/resource/pubmed/commentcorrection/15220473-11248196, http://linkedlifedata.com/resource/pubmed/commentcorrection/15220473-11382810, http://linkedlifedata.com/resource/pubmed/commentcorrection/15220473-11500563, http://linkedlifedata.com/resource/pubmed/commentcorrection/15220473-11572991, http://linkedlifedata.com/resource/pubmed/commentcorrection/15220473-11884687, http://linkedlifedata.com/resource/pubmed/commentcorrection/15220473-11996656, http://linkedlifedata.com/resource/pubmed/commentcorrection/15220473-12034882, http://linkedlifedata.com/resource/pubmed/commentcorrection/15220473-13771349, http://linkedlifedata.com/resource/pubmed/commentcorrection/15220473-14535887, http://linkedlifedata.com/resource/pubmed/commentcorrection/15220473-16661188, http://linkedlifedata.com/resource/pubmed/commentcorrection/15220473-16662089, http://linkedlifedata.com/resource/pubmed/commentcorrection/15220473-16663169, http://linkedlifedata.com/resource/pubmed/commentcorrection/15220473-16668116, http://linkedlifedata.com/resource/pubmed/commentcorrection/15220473-16668693, http://linkedlifedata.com/resource/pubmed/commentcorrection/15220473-239746, http://linkedlifedata.com/resource/pubmed/commentcorrection/15220473-4747067, http://linkedlifedata.com/resource/pubmed/commentcorrection/15220473-5220864, http://linkedlifedata.com/resource/pubmed/commentcorrection/15220473-9264460, http://linkedlifedata.com/resource/pubmed/commentcorrection/15220473-9507001
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Jul
pubmed:issn
0027-8424
pubmed:author
pubmed:issnType
Print
pubmed:day
6
pubmed:volume
101
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
10211-6
pubmed:dateRevised
2010-9-21
pubmed:meshHeading
pubmed:year
2004
pubmed:articleTitle
A probable Na+(K+)/H+ exchanger on the chloroplast envelope functions in pH homeostasis and chloroplast development in Arabidopsis thaliana.
pubmed:affiliation
Department of Plant Sciences, University of Arizona, Tucson, 85721, USA.
pubmed:publicationType
Journal Article, Research Support, U.S. Gov't, P.H.S., Research Support, U.S. Gov't, Non-P.H.S., Research Support, Non-U.S. Gov't