Linked Life Data

11536959

Source:http://linkedlifedata.com/resource/pubmed/id/11536959

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
1
pubmed:dateCreated
1995-5-10
pubmed:abstractText
Prior research has shown that gravistimulation induces preferential movement of calcium toward the lower side of the tips of maize roots and that roots depleted of calcium show impaired gravitropism. To further investigate the role of calcium in root gravitropism, we examined the effects of calcium on auxin movement in both vertical and gravistimulated roots of maize. Longitudinal movement of auxin was basipetally polar in intact roots but acropetally polar in decapped roots. Treatment of the root tip with calcium increased basipetal auxin movement in both intact and decapped roots. Gravistimulation induced asymmetric auxin movement toward the lower side of the root tip. Both asymmetric auxin movement and gravicurvature were inhibited by treatment of the root tip with auxin transport inhibitors or with EGTA. The results indicate that there is a close correlation between curvature and gravity-induced asymmetric auxin movement across the root cap. Since gravistimulation causes calcium movement toward the lower side of the root tip, our observation that calcium promotes basipetal auxin movement supports the idea that gravity-induced calcium asymmetry is a key step linking gravistimulation to the establishment of auxin asymmetry during root gravitropism.
pubmed:keyword
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
S
pubmed:chemical
pubmed:status
MEDLINE
pubmed:issn
0273-1177
pubmed:author
pubmed:issnType
Print
pubmed:volume
12
pubmed:owner
NASA
pubmed:authorsComplete
Y
pubmed:pagination
211-8
pubmed:dateRevised
2007-4-16
pubmed:meshHeading
pubmed:year
1992
pubmed:articleTitle
The role of calcium in the regulation of hormone transport in gravistimulated roots.
pubmed:affiliation
Department of Plant Biology, Ohio State University, Columbus 43210.
pubmed:publicationType
Journal Article