Linked Life Data

18242769

Source:http://linkedlifedata.com/resource/pubmed/id/18242769

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
14
pubmed:dateCreated
2008-9-8
pubmed:abstractText
Phenylalanine ammonia-lyase (PAL, EC 4.3.1.5) catalyzes the first step in the phenylpropanoid pathway, and is considered an important regulation point between primary and secondary metabolism. In the present work we analyzed expression of the PAL genes in leaves of Arabidopsis thaliana rosette-stage plants in response to nitrogen depletion at temperatures ranging from 5 to 30 degrees C. Only PAL1 and PAL2 responded strongly to both environmental factors, nitrogen and temperature. Regardless of nitrogen treatments, PAL1 and 2 transcript levels increased at 5 and 10 degrees C. Averaged across all temperatures, nitrogen depletion led to a two-fold increase in PAL1 and PAL2 transcripts. PAL activity was correlated with PAL transcript levels (R=0.94). Accumulation of major soluble phenylpropanoids, sinapic acid esters and flavonoids, increased in response to lowering temperature. The flavonoids, kaempferols, quercetins and anthocyanins, showed significantly increased levels as a result of nitrogen depletion (two-, five- and six-fold increases, respectively) when averaged across all temperatures. PAL1, PAL2 and PAL4 have previously been shown to be related with tissue-specific lignin synthesis, and the present work shows that PAL1 and PAL2 also have functional specialization in abiotic environmental-triggered flavonoid synthesis.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Sep
pubmed:issn
1618-1328
pubmed:author
pubmed:issnType
Electronic
pubmed:day
29
pubmed:volume
165
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
1491-9
pubmed:dateRevised
2009-11-19
pubmed:meshHeading
pubmed:year
2008
pubmed:articleTitle
Differential expression of four Arabidopsis PAL genes; PAL1 and PAL2 have functional specialization in abiotic environmental-triggered flavonoid synthesis.
pubmed:affiliation
Faculty of Science and Technology, University of Stavanger, Stavanger, Norway.
pubmed:publicationType
Journal Article, Research Support, Non-U.S. Gov't