Linked Life Data

11809376

Source:http://linkedlifedata.com/resource/pubmed/id/11809376

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
2-3
pubmed:dateCreated
2002-1-25
pubmed:abstractText
The influence of carotenoids on partial protochlorophyllide (Pchlide) photoreduction and the successive formation of long-wavelength chlorophyllide (Chlide) forms was studied by low-temperature fluorescence spectroscopy (77 K). Wheat leaves with a decreased content of carotenoids obtained from norflurazon-treated seedlings (10 and 100 micromol l(-1)) were compared with leaves containing normal amounts of these pigments. Partial photoreduction of Pchlide was achieved by irradiation of the leaves with one light flash in combination with a number of neutral gray and/or red Perspex filters. There were significant differences between the fluorescence emission spectra (the position and height of the peaks) of dark-grown normal and carotenoid-deficient leaves irradiated with non-saturating white light of increasing intensity. The long-wavelength Chlide forms appeared first in the leaves nearly devoid of carotenoids (treated with 100 micromol l(-1) norflurazon), then in the leaves with carotenoid deficiency (treated with 10 micromol l(-1) norflurazon), and finally in normal leaves. After irradiation with non-saturating light of the same intensity, the ratio Chlide/Pchlide(657) was always the highest in the leaves nearly deficient of carotenoids, medium in the leaves with carotenoid deficiency and lowest in the normal leaves. Similarly to white light, red light of low intensity induced faster formation of long-wavelength Chlide species in the leaves with carotenoid deficiency in comparison to the normal leaves. We propose that, in leaves with reduced carotenoid content, a greater number of Pchlide molecules transform to Chlide per light flash than in normal leaves. The results are discussed in relation to the involvement of carotenoids in competitive absorption and light screening, as well as to their influence on Pchlide-Chlide interactions.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Dec
pubmed:issn
1011-1344
pubmed:author
pubmed:issnType
Print
pubmed:day
31
pubmed:volume
65
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
171-6
pubmed:dateRevised
2007-7-23
pubmed:meshHeading
pubmed:year
2001
pubmed:articleTitle
Carotenoid dependence of the protochlorophyllide to chlorophyllide phototransformation in dark-grown wheat seedlings.
pubmed:affiliation
Department of Plant Physiology and Molecular Biology, University of Plovdiv, Tsar Assen 24 St., 4000 Plovdiv, Bulgaria. galiahoo@yahoo.com
pubmed:publicationType
Journal Article