Počet záznamů: 1
Deficiency and toxicity of nanomolar copper in low irradiance-A physiological and metalloproteomic study in the aquatic plant Ceratophyllum demersum
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SYSNO ASEP 0460452 Druh ASEP J - Článek v odborném periodiku Zařazení RIV J - Článek v odborném periodiku Poddruh J Článek ve WOS Název Deficiency and toxicity of nanomolar copper in low irradiance-A physiological and metalloproteomic study in the aquatic plant Ceratophyllum demersum Tvůrce(i) Thomas, G. (DE)
Andresen, Elisa (BC-A) RID, ORCID
Mattusch, J. (DE)
Hubáček, Tomáš (BC-A) RID
Küpper, Hendrik (BC-A) RID, ORCIDZdroj.dok. Aquatic Toxicology. - : Elsevier - ISSN 0166-445X
Roč. 177, August 2016 (2016), s. 226-236Poč.str. 11 s. Forma vydání Tištěná - P Jazyk dok. eng - angličtina Země vyd. NL - Nizozemsko Klíč. slova Ceratophyllum demersum ; Biophysics of photosynthesis ; Chlorophyll fluorescence kinetics Vědní obor RIV BO - Biofyzika CEP LM2015075 GA MŠMT - Ministerstvo školství, mládeže a tělovýchovy Institucionální podpora BC-A - RVO:60077344 UT WOS 000381529700023 EID SCOPUS 84973908848 DOI 10.1016/j.aquatox.2016.05.016 Anotace Essential trace elements (Cu2+, Zn2+, etc) lead to toxic effects above a certain threshold, which is a major environmental problem in many areas of the world. Here, environmentally relevant sub-micromolar concentrations of Cu2+ and simulations of natural light and temperature cycles were applied to the aquatic macrophyte Ceratophyllum demersum a s a model for plant shoots. In this low irradiance study resembling non-summer conditions, growth was optimal in the range 7.5-35 nM Cu, while PSII activity (Fv/Fm) was maximal around 7.5 nM Cu. Damage to the light harvesting complex of photosystem II (LHCII) was the first target of Cu toxicity (>50 nM Cu) where Cu replaced Mg in the LHCII-trimers. This was associated with a subsequent decrease of Chl a as well as heat dissipation (NPQ). The growth rate was decreased from the first week of Cu deficiency. Plastocyanin malfunction due to the lack of Cu that is needed for its active centre was the likely cause of diminished electron flow through PSII (ΦPSII). The pigment decrease added to the damage in the photosynthetic light reactions. These mechanisms ultimately resulted in decrease of starch and oxygen production. Pracoviště Biologické centrum (od r. 2006) Kontakt Dana Hypšová, eje@eje.cz, Tel.: 387 775 214 Rok sběru 2017
Počet záznamů: 1