In declining forests of the Vosges mountains (northeast of France), we previously observed that the yellowing of spruce (Picea abies L. cv. Karsten) needles was associated with impairment of the free radical scavenging capacity of the cells and coincided with chronic exposure to ozone. Chloroplasts of yellow needles were characterized by an abnormal accumulation of photosystem II (PSII) D1-protein in the thylakoids. Further experiments carried out on declining and decline-resistant individual spruce trees characterized in previous studies showed that needle yellowing was associated with impairment of the overall anti-oxidative defense in both the cytosol and the chloroplasts. Both enzymic (peroxidases) and non-enzymic (carotenoids) oxidant scavengers were shown to be affected in the declining spruce. PSII D1-protein accumulation seemed to result from a stabilization of the polypeptide, which led us to hypothesize that oxidative processes might interfere with the specific degradation of this protein in declining spruce, with destructive consequences for the photosystems.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1007/BF02987459 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Article Synopsis
- * The decline in insecticide effectiveness leads to a "window of selection," where the survival rates of resistant versus susceptible insects shift, a phenomenon also seen in bacteria and malaria parasites.
- * By focusing on how different genotypes (resistant, susceptible, and heterozygous) are affected by mortality rates post-insecticide application, researchers can better develop strategies to manage and reduce the evolution of insecticide resistance.
Biochemical and molecular studies on declining and decline-resistant spruce in the north-east of France.
Environ Sci Pollut Res Int
May 2002
Institut de Biologie Moléculaire des Plantes du CNRS, Université Louis Pasteur, 12 rue du Général Zimmer, F-67084 Strasbourg, France.
In declining forests of the Vosges mountains (northeast of France), we previously observed that the yellowing of spruce (Picea abies L. cv. Karsten) needles was associated with impairment of the free radical scavenging capacity of the cells and coincided with chronic exposure to ozone.
View Article and Find Full Text PDFSensitivity of age-decline resistant ("hold") WAIS subtests to Alzheimer's disease.
J Clin Exp Neuropsychol
October 1985
WAIS age-decline-resistant ("hold") and age-decline-sensitive ("don't hold") subtests were both effective in discriminating 25 patients with Alzheimer-type dementia (DAT) from 25 normal elderly subjects who were matched on age, education, and sex. We found that global ratings of severity of dementia correlated significantly with the WAIS Information and Digit Symbol subtests, but not with memory test scores. These data indicate that (1) the practice of estimating premorbid ability based on current "hold" test performance should be abandoned, and (2) the utility of memory tests is greatest for initial diagnosis of DAT, while WAIS cognitive variables may be more useful in evaluating DAT severity.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!