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MANGANESE AS ESSENTIAL AND TOXIC ELEMENT FOR PLANTS: TRANSPORT, ACCUMULATION AND RESISTANCE MECHANISMS
Manganese is an essential element for plants, intervening in several metabolic processes, mainly in photosynthesis and as an enzyme antioxidant-cofactor. Nevertheless, an excess of this micronutrient…
Structure and composition of the photochemical apparatus of the antarctic green alga, Chlamydomonas subcaudata
- R. Morgan, A. Ivanov, J. Priscu, D. Maxwell, N. Huner
- Environmental SciencePhotosynthesis Research
- 1 June 1998
The psychrophile and mesophile exhibited comparable photosynthetic efficiency for O2 evolution regardless of growth conditions, and immunoblotting indicated that the stoichiometry of PS II:PS I:CF1 is significantly altered in C. subcaudata compared to the mesophile.
IMMUTANS Does Not Act as a Stress-Induced Safety Valve in the Protection of the Photosynthetic Apparatus of Arabidopsis during Steady-State Photosynthesis1
Neither functional analyses of the IM knockout and overexpression lines nor meta-analyses of gene expression support the model that IM acts as a safety valve to regulate the redox state of the PQ pool during stress and acclimation, but IM appears to be strongly regulated by developmental stage of Arabidopsis.
Differential thermal effects on the energy distribution between photosystem II and photosystem I in thylakoid membranes of a psychrophilic and a mesophilic alga.
Psychrophily is associated with differential energy partitioning, photosystem stoichiometry and polypeptide phosphorylation in Chlamydomonas raudensis.
Photosystem II Excitation Pressure and Development of Resistance to Photoinhibition (II. Adjustment of Photosynthetic Capacity in Winter Wheat and Winter Rye)
It is demonstrated that low-temperature-induced tolerance to photoinhibition is not a low-Temperature-growth effect per se but, instead, reflects increased photosynthetic capacity in response to elevated PSII excitation pressure, which may be modulated by either temperature or irradiance.
Excess manganese differentially inhibits photosystem I versus II in Arabidopsis thaliana
- R. Millaleo, M. Reyes-Díaz, M. Alberdi, A. Ivanov, M. Król, N. Hüner
- Environmental ScienceJournal of experimental botany
- 26 November 2012
The results demonstrate for the first time that PSI is the major target of Mn toxicity within the photosynthetic apparatus of Arabidopsis plants.
Betaine Improves Freezing Tolerance in Wheat
Betaine treatment resulted in the induction of a subset of low temperature responsive genes, such as the wcor410, and wcor413, that are also induced by salinity or drought stresses and was able to improve the tolerance to photoinhibition of PSII and the steady-state yield of electron transport over PSII in a manner that mimicked cold-acclimated plants.
Energy balance, organellar redox status, and acclimation to environmental stress
- K. Wilson, A. Ivanov, G. Öquist, B. Grodzinski, F. Sarhan, N. Huner
- Environmental Science
- 29 September 2006
In plants and algal cells, changes in light intensity can induce intrachloroplastic and retrograde regulation of gene expression in response to changes in the plastoquinone redox status. We review ...
The Antarctic psychrophile, Chlamydomonas subcaudata, is deficient in state I–state II transitions
The Antarctic psychrophile, C. subcaudata, is an example of a natural variant deficient in State I–State II transitions, and this deficiency is associated with reduced levels of Psa A/B relative to D1, the absence of specific photosystem I light-harvesting polypeptides and a cytochrome b6/f complex.