Imbalances of D1 Protein Turnover during Stress Induced Chlorosis of a Declining Spruce Tree

Konopka, Claudia; Hollinderbäumer, Reinhard; Ebbert, Volker; Wietoska, Helga; Godde, Doris

doi:10.1016/s0176-1617(96)80260-4

Cited by 5 publications

(1 citation statement)

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“…2) and by detoxifying stress-induced epoxy groups from thylakoid lipids has also been discussed. 30,32 One essential mechanism allowing still reasonable, though reduced, photosynthetic rates at an excess of highlight is the partial inactivation of photosystem II centers by the process of photoinhibition (destruction of the D1-protein), 33,34 which protects the remaining photosystem II centers from photodestruction. In this response, a partial photoinhibition of some chloroplasts guarantees the maintenance of sufficient photosynthetic net CO 2 assimilation rates in other leaf chloroplasts in order to allow plant growth and development even at excess high-light conditions.…”

Section: Stressors and Stress-coping Mechanismsmentioning

confidence: 99%

The Stress Concept in Plants: An Introduction

1998

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The current concept of stress in plants has been well developed over the past 60 years. Any unfavorable condition or substance that affects or blocks a plant's metabolism, growth, or development is regarded as stress. Vegetation stress can be induced by various natural and anthropogenic stress factors. One has to differentiate between short-term and long-term stress effects as well as between low-stress events that can be partially compensated for by acclimation, adaptation, and repair mechanisms, on the one hand, and strong stress or chronic stress events causing considerable damage that may eventually lead to cell and plant death, on the other hand. Some essential stress syndrome responses of plants are summarized in a unifying stress concept. The major abiotic, biotic, and anthropogenic stressors are listed. Some stress tolerance mechanisms are mentioned. Stress conditions and stress-induced damage in plants have so far been detected using the classical ecophysiological field methods as well as point data measurements of particular chlorophyll fluorescence parameters and of reflectance spectra. The novel laser-induced high-resolution fluorescence imaging technique, which integrates chlorophyll and blue-green fluorescence, marks a new standard in the detection of stress in plants.

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Section: Stressors and Stress-coping Mechanismsmentioning

confidence: 99%

The Stress Concept in Plants: An Introduction

1998

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Biochemical and molecular studies on declining and decline-resistant spruce in the north-east of France

Weber-Lotfi

Guillemaut

Poirey

et al. 2002

Environ Sci & Pollut Res

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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.

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