Effects of abiotic stresses on the turnover of the D₁ reaction centre II protein

Abstract

Effects of abiotic stresses on the turnover of the Di reaction centre II protein. -Physiol. Plant. 101: 635-642.In the 199O's, evidence has accumulated that various unfavourable environmental conditions substantially affect the turnover of the D| protein of reaction centre II, the psbA gene product. Biochemical, molecular and physiological studies in higher plants indicate that alterations of Di protein turnover occur under drought, nutrition deficiency, heat, chemical stress, ozone fumigation as well as UV-B and visible photo-stresses. The behaviour of photosystem II under these various stress conditions indicates that the response of Di protein turnover can be interpreted as a general adaptive response to environmental extremes.

Temperature-dependent chlorophyll accumulation and photosystem II assembly during etioplast to chloroplast transition in sunflower cotyledons

“…So, the lower chlorophyll concentrations in such cases would be the result of diminished biosynthesis. Further, low temperatures diminish CO 2 fi xation and thus increase the chance for over-reduction of the electron-transport chain and consequently for photo-damage of PSII due to inhibition of the repair cycle of D1 protein, the essential protein for optimal PSII functioning (Giardi et al 1997). Fig.…”

Chlorophyll as a measure of plant health: Agroecological aspects

“…The ratio of the energy used and energy lost depends on several abiotic (high/low temperature, salinity and soil pH, drought, presence of phytotoxic elements in the soil, etc. ), biotic (phytopathogenic viruses, bacteria, fungi, nematodes, arthropods and other organisms) and xenobiotic factors (pesticides, other phytotoxic chemicals, radionuclides and similar) and their combinations (DemmigAdams and Adams, 1992;Long et al, 1994;Giardi et al, 1997). All these factors limit the synthesis and utilization of organic matter, and growth and development of plants (Lichtenthaler, 1996;Larcher, 2003).…”

“…Many researchers have studied the impact of various factors on the process of photosynthesis (Long et al, 1994;Lichtenthaler, 1996;Giardi et al, 1997;Larcher, 2003;Lichtenhaler and Babani, 2004). A particularly interesting aspect of this issue is the inhibition of photosynthesis by herbicides (Nikolić, 1997;Klem et al, 2002;Pavlović, 2005;Nikolić, 2007;Nikolić et al, 2007 a, b, c;Pavlović, 2010).…”

“…on the physiology and yield of cultivated plants and weeds. Adaptation of plants to extreme environmental conditions causes short-term chemical, molecular and physiological, as well as long-term physiological, structural and morphological modifications (Giardi et al, 1997). Changes in activation, transcription and translation of genes often occur during acclimatization of plants and develop into a kind of tolerance to a stressful factor (Lichtenthaler, 1996;Giardi et al, 1997).…”

Effects of Some Heavy Metals in Some Morpho-Physiological Parameters in Maize Seedlings

“…Cereals in this case maize are known to be good accumulators of contaminants (Malgorzata and Andzej, 2005). The mechanisms of heavy metal toxicity on photosynthesis is still a matter of speculations, this may be partly due to the differences in experimental design, but some evidence points to the involvement of electron transport in lights reactions (Giardi et al, 1997). The lack of cultivable and productive land has been attributed to soil contamination from high rate of heavy metals (USEPA, 1997).…”