scholarly journals Building a better equation for electron transport estimated from Chl fluorescence: accounting for nonphotosynthetic light absorption

2019 ◽  
Vol 225 (2) ◽  
pp. 604-608
Author(s):  
Alan M. McClain ◽  
Thomas D. Sharkey
Keyword(s):  
Electron Transport ◽  
Light Absorption ◽  
Chl Fluorescence

The Leafless Orchid Cymbidium macrorhizon Performs Photosynthesis in the Pericarp during the Fruiting Season

2021 ◽  
Author(s):  
Koichi Kobayashi ◽  
Kenji Suetsugu ◽  
Hajime Wada
Keyword(s):  
Electron Transport ◽  
Mycorrhizal Fungi ◽  
Significant Proportion ◽  
Photochemical Efficiency ◽  
Fluorescence Analysis ◽  
Photosynthetic Electron Transport ◽  
Isotopic Analysis ◽  
Fluorescence Induction ◽  
Induction Kinetics ◽  
Chl Fluorescence

Abstract Photosynthesis with highly photoreactive chlorophyll (Chl) provides energy for plant growth but with simultaneous risk of photooxidative damage and photoprotection costs. Although the leafless orchid Cymbidium macrorhizon mostly depends on mycorrhizal fungi for carbon, it accumulates Chl particularly during fruiting and may not be fully mycoheterotrophic. In fact, stable isotopic analysis suggested that the fruiting C. macrorhizon specimens obtain a significant proportion of its carbon demands through photosynthesis. However, actual photosynthetic characteristics of this leafless orchid are unknown. To reveal the functionality of photosynthetic electron transport in C. macrorhizon, we compared its photosynthetic properties with those of its relative mixotrophic orchid Cymbidium goeringii and the model plant Arabidopsis thaliana. Compared with C. goeringii and A. thaliana, maximum photochemical efficiency of PSII was substantially low in C. macrorhizon. Chl fluorescence induction kinetics revealed that the electron transport capacity of PSII was limited in C. macrorhizon. Chl fluorescence analysis at 77 K suggested partial energetic disconnection of the light-harvesting antenna from the PSII reaction center in C. macrorhizon. Despite its low PSII photochemical efficiency, C. macrorhizon showed photosynthetic electron transport activity both in the field and under laboratory conditions. Cymbidium macrorhizon developed strong nonphotochemical quenching in response to increased light intensity as did C. goeringii, suggesting the functionality of photoprotective systems in this orchid. Moreover, C. macrorhizon fruit developed stomata on the pericarp and showed net O2-evolving activity. Our data demonstrate that C. macrorhizon can perform photosynthetic electron transport in the pericarp, although its contribution to net carbon acquisition may be limited.

scholarly journals Effective light absorption and absolute electron transport rates in the coral Pocillopora damicornis

2014 ◽  
Vol 83 ◽  
pp. 159-167 ◽  
Author(s):  
Milán Szabó ◽  
Daniel Wangpraseurt ◽  
Bojan Tamburic ◽  
Anthony W.D. Larkum ◽  
Ulrich Schreiber ◽  
...  
Keyword(s):  
Electron Transport ◽  
Light Absorption ◽  
Pocillopora Damicornis ◽  
Electron Transport Rates

Solar paint of ZnO/CdS and ZnO/CdSe based on commercial ZnO

2016 ◽  
Vol 09 (02) ◽  
pp. 1650018 ◽  
Author(s):  
Yi Guo ◽  
Xiang Zhang ◽  
Yanhong Li ◽  
Yanmei Li ◽  
Chunli Hu ◽  
...  
Keyword(s):  
Solar Cells ◽  
Solar Cell ◽  
Electron Transport ◽  
High Power ◽  
Light Absorption ◽  
Power Conversion ◽  
High Power Conversion Efficiency ◽  
Solar Cell Fabrication ◽  
Zno Particles ◽  
Cell Fabrication

We report a facile and cheap route to the fabrication of ZnO/CdS and ZnO/CdSe based on commercial ZnO particles. The obtained product can be directly brush printed as solar paint. The results show that the solar cell based on the mixture of ZnO/CdS and ZnO/CdSe have a better light absorption and electron transport ability, and a high power conversion efficiency (PCE) of 1.36% was obtained, which is the highest PCE reported for inorganic paint-based solar cells to date. This method greatly simplifies the process of the solar cell fabrication and opens a door toward the cheap and printable solar paint based on commercial available materials.

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