Linked Life Data

15501907

Source:http://linkedlifedata.com/resource/pubmed/id/15501907

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
409
pubmed:dateCreated
2004-12-13
pubmed:abstractText
Proteoid roots play a major role in enabling white lupin (Lupinus albus L.) to adapt to phosphate (Pi) deficiency. Such roots release citrate from proteoid rootlets, which allows this species to mobilize Pi from sparingly soluble Pi sources. Release of citrate is preceded by a significant accumulation of organic acids, in which a Pi deficiency-inducible phosphoenolpyruvate carboxylase (PEPC) activity has been involved. To gain an insight into this adaptive mechanism, the expression of three different transcripts coding for PEPC was examined in proteoid rootlets of Pi-starved and Pi-starved-and-rescued white lupin. Semi-quantitative reverse transcriptase (RT)-PCR experiments performed with gene-specific primers targeted to the 3'-end region of the corresponding cDNAs revealed that the transcripts for these three PEPCs differentially accumulate in both Pi-starved and Pi-starved-and-rescued proteoid rootlets. Semi-quantitative RT-PCR analysis in Pi-starved proteoid rootlets sampled at different times after being rescued from Pi deficiency showed that Pi levels differentially down-regulated the three PEPC transcripts. RT-PCR experiments were further extended to Pi-starved and Pi-fed whole roots, cotyledons, and leaves on which a tissue-specific, Pi-dependent PEPC expression was observed. These results indicate that there exists at least three different transcripts coding for PEPC in proteoid root clusters of white lupin, whose expression are differentially regulated by Pi.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Jan
pubmed:issn
0022-0957
pubmed:author
pubmed:issnType
Print
pubmed:volume
56
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
145-53
pubmed:dateRevised
2006-11-15
pubmed:meshHeading
pubmed:year
2005
pubmed:articleTitle
Phosphate deficiency regulates phosphoenolpyruvate carboxylase expression in proteoid root clusters of white lupin.
pubmed:affiliation
Instituto de Investigaciones Agropecuarias, Unidad de Biotecnología, INIA Carillanca, Casilla 58-D, Temuco, Chile. epenaloz@carillanca.inia.cl
pubmed:publicationType
Journal Article, Research Support, Non-U.S. Gov't