photosystem


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Related to photosystem: Reaction center

photosystem

(ˈfəʊtəʊˌsɪstəm)
n
(Botany) botany either of two pigment-containing systems, photosystem I or II, in which the light-dependent chemical reactions of photosynthesis occur in the chloroplasts of plants
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References in periodicals archive ?
In addition, Mg deficiency affects the size, structure and function of chloroplasts, including the electron transfer in photosystem II (MCSWAIN; TSUJIMOTO; ARNON, 1976; MAATHUIS, 2009).
(2017b) exposed Atriplex nummularia plants to irrigation water from 0 to 40 dS [m.sup.-1] under soil conditions and stated that under high salinity levels, the increase of Fo could mean the possible loss of the reaction centers of photosystem II as well as in oxidative damage (Baker, 2008).
Among the negative effects promoted by saline stress, the reduction of photosynthetic activity stands out as one of the most limiting to the crops (Neves et al., 2009; Silva et al., 2014; Souza et al., 2011, Taiz et al., 2004), or to restrictions on photochemical activity, leading to reductions in the potential quantum efficiency of photosystem II (Praxedes et al., 2010; Silva et al., 2014; Souza et al., 2011).
This is first of its kind model to use hydrogenase and photosystem II for creating semi-artificial photosynthesis supported entirely by solar power.
This model is the first to successfully use hydrogenase and photosystem II to create semi-artificial photosynthesis driven purely by solar power.
The study, titled "Bias-free photoelectrochemical water splitting with photosystem II on a dye-sensitized photoanode wired to hydrogenase," was published Sept. 3 in the journal (http://dx.doi.org/10.1038/s41560-018-0232-y) Nature Energy.
Chlorophyll a fluorescence study revealing effects of high salt stress on Photosystem II in wheat leaves.
ROS can damage DNA, proteins such as the Dl protein in photosystem II (PS[PI]) and its repair mechanism and the enzyme ribulose 1,5-bisphosphate decarboxylase/oxygenase (Rubisco), and thylakoid membranes, leading to photosynthetic dysfunction (Lesser, 1996, 1997,2006; Weis, 2008; Roth, 2014).
Data on maximum quantum efficiency as determined by the ratio of variable florescence to maximum florescence (Fv/Fm) and the ratio of efficiency of electron donation to photosystem II estimated by the ratio of variable fluorescence to minimum fluorescence (Fv/Fo) were also recorded.
Two genes were involved in transport, namely, genes encoding ATP-binding cassette (PAU011882.1) and calcium-transporting ATPase 12 (PAU023543.1), and two genes were involved in photosynthesis, namely, genes encoding chlorophyll a-b binding protein (PAU002322.1) and photosystem II 10kDa polypeptide (PAU000284.1).