Linked Life Data

15779828

Source:http://linkedlifedata.com/resource/pubmed/id/15779828

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
2
pubmed:dateCreated
2005-3-22
pubmed:abstractText
Leaves of 7-day-old barley seedlings were subjected to heat pulses at 50 degrees C for 20 or 40s to inhibit partially or fully the oxygen evolution without inducing visible symptoms. By means of biophysical techniques, we investigated the time course and mechanism of photosystem II (PSII) recovery. After the heat treatment, the samples were characterized by typical heat stress symptoms: loss of oxygen evolution activity, strong decrease of Fv/Fm, induction of the K-step in the fluorescence induction transient, emergence of the AT-thermoluminescence-band and a dramatic increase in membrane permeability. In the first 4h in the light following the heat pulse, the AT-band and the K-step disappeared in parallel, indicating the loss of this restricted activity of PSII. This phase was followed by a recovery period, during which PSII-activity was gradually restored in the light. In darkness, no recovery, except for the membrane permeability, was observed. A model is presented that accounts for (i) the damage induced by the heat pulse on the membrane architecture and on the PSII donor side, (ii) the light-dependent removal of the impaired reaction centers from the disorganized membrane, and (iii) the subsequent light-independent restoration of the membrane permeability and the de novo synthesis of the PSII reaction centers in the light.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Feb
pubmed:issn
0176-1617
pubmed:author
pubmed:issnType
Print
pubmed:volume
162
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
181-94
pubmed:dateRevised
2011-11-17
pubmed:meshHeading
pubmed:year
2005
pubmed:articleTitle
Biophysical studies of photosystem II-related recovery processes after a heat pulse in barley seedlings (Hordeum vulgare L.).
pubmed:affiliation
Laboratory of Bioenergetics, University of Geneva, Chemin des Embrouchis 10, CH-1254 Jussy, Switzerland. toth1@etu.unige.ch
pubmed:publicationType
Journal Article, Research Support, Non-U.S. Gov't