Linked Life Data

11536740

Source:http://linkedlifedata.com/resource/pubmed/id/11536740

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
3
pubmed:dateCreated
1997-10-18
pubmed:abstractText
Previous work on the growth biophysics of maize (Zea mays L.) primary roots suggested that cell walls in the apical 5 mm of the elongation zone increased their yielding ability as an adaptive response to low turgor and water potential (psi w). To test this hypothesis more directly, we measured the acid-induced extension of isolated walls from roots grown at high (-0.03 MPa) or low (-1.6 MPa) psi w using an extensometer. Acid-induced extension was greatly increased in the apical 5 mm and was largely eliminated in the 5- to 10-mm region of roots grown at low psi w. This pattern is consistent with the maintenance of elongation toward the apex and the shortening of the elongation zone in these roots. Wall proteins extracted from the elongation zone possessed expansin activity, which increased substantially in roots grown at low psi w. Western blots likewise indicated higher expansin abundance in the roots at low psi w. Additionally, the susceptibility of walls to expansin action was higher in the apical 5 mm of roots at low psi w than in roots at high psi w. The basal region of the elongation zone (5-10 mm) did not extend in response to expansins, indicating that loss of susceptibility to expansins was associated with growth cessation in this region. Our results indicate that both the increase in expansin activity and the increase in cell-wall susceptibility to expansins play a role in enhancing cell-wall yielding and, therefore, in maintaining elongation in the apical region of maize primary roots at low psi w.
pubmed:grant
pubmed:commentsCorrections
http://linkedlifedata.com/resource/pubmed/commentcorrection/11536740-11536663, http://linkedlifedata.com/resource/pubmed/commentcorrection/11536740-11536718, http://linkedlifedata.com/resource/pubmed/commentcorrection/11536740-11538167, http://linkedlifedata.com/resource/pubmed/commentcorrection/11536740-11607483, http://linkedlifedata.com/resource/pubmed/commentcorrection/11536740-1400418, http://linkedlifedata.com/resource/pubmed/commentcorrection/11536740-1554366, http://linkedlifedata.com/resource/pubmed/commentcorrection/11536740-16664006, http://linkedlifedata.com/resource/pubmed/commentcorrection/11536740-16666126, http://linkedlifedata.com/resource/pubmed/commentcorrection/11536740-16667621, http://linkedlifedata.com/resource/pubmed/commentcorrection/11536740-16667664, http://linkedlifedata.com/resource/pubmed/commentcorrection/11536740-16668205, http://linkedlifedata.com/resource/pubmed/commentcorrection/11536740-5219815
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
S
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Jul
pubmed:issn
0032-0889
pubmed:author
pubmed:issnType
Print
pubmed:volume
111
pubmed:owner
NASA
pubmed:authorsComplete
Y
pubmed:pagination
765-72
pubmed:dateRevised
2010-9-14
pubmed:meshHeading
pubmed:year
1996
pubmed:articleTitle
Growth maintenance of the maize primary root at low water potentials involves increases in cell-wall extension properties, expansin activity, and wall susceptibility to expansins.
pubmed:affiliation
Plant Science Unit, University of Missouri, Columbia 65211, USA.
pubmed:publicationType
Journal Article, Comparative Study, Research Support, U.S. Gov't, Non-P.H.S., Research Support, Non-U.S. Gov't