scholarly journals Cold Stress Effects on PSI Photochemistry in Zea mays: Differential Increase of FQR-Dependent Cyclic Electron Flow and Functional Implications

2011 ◽  
Vol 52 (6) ◽  
pp. 1042-1054 ◽  
Author(s):  
Leonid V. Savitch ◽  
Alexander G. Ivanov ◽  
Loreta Gudynaite-Savitch ◽  
Norman P. A. Huner ◽  
John Simmonds
Keyword(s):  
Zea Mays ◽  
Cold Stress ◽  
Electron Flow ◽  
Cyclic Electron Flow ◽  
Stress Effects ◽  
Functional Implications ◽  
Differential Increase

scholarly journals Cyanobacterial Alkanes Modulate Photosynthetic Cyclic Electron Flow to Assist Growth under Cold Stress

2015 ◽  
Vol 5 (1) ◽  
Author(s):  
Bertram M. Berla ◽  
Rajib Saha ◽  
Costas D. Maranas ◽  
Himadri B. Pakrasi
Keyword(s):  
Cold Stress ◽  
Electron Flow ◽  
Cyclic Electron Flow

Isolation and Properties of Functional Mesophyll Protoplasts and Chloroplasts From Zea mays

1981 ◽  
Vol 8 (1) ◽  
pp. 21 ◽  
Author(s):  
DA Day ◽  
CLD Jenkins ◽  
MD Hatch
Keyword(s):  
Zea Mays ◽  
Oxygen Evolution ◽  
Pyridoxal Phosphate ◽  
Electron Flow ◽  
Cyclic Electron Flow ◽  
The Other ◽  
Mesophyll Protoplasts ◽  
Intact Chloroplasts ◽  
Common Carrier ◽  
High Concentrations

A procedure is described for the preparation of metabolically active mesophyll protoplasts from maize, and of functional, intact chloroplasts from these protoplasts. Intact protoplasts show no oxygen evolution with 3-phosphoglycerate or with oxalacetate plus pyruvate as substrates, even when these substances are provided at high concentrations. On the other hand, protoplast extracts and chloroplasts display rates of oxygen evolution of 2-3 �mol min-1 (mg Chl)-1 with the same substances. Pyruvate stimulates oxalacetate-dependent oxygen evolution substantially, indicating good coupling between non-cyclic electron flow and phosphorylation. Low PI concentrations stimulate 3-phosphoglycerate-dependent oxygen evolution; high PI concentrations, and pyridoxal phosphate, inhibit this activity, suggesting a common carrier for 3-phosphoglycerate and PI.

Cyclic electron flow around PSI monitored by afterglow luminescence in leaves of maize inbred lines (Zea mays L.): correlation with chilling tolerance

Planta ◽  
2005 ◽  
Vol 221 (4) ◽  
pp. 567-579 ◽  
Author(s):  
Jean-Marc Ducruet ◽  
Miruna Roman ◽  
Michel Havaux ◽  
Tibor Janda ◽  
André Gallais
Keyword(s):  
Zea Mays ◽  
Zea Mays L ◽  
Electron Flow ◽  
Chilling Tolerance ◽  
Inbred Lines ◽  
Cyclic Electron Flow ◽  
Maize Inbred Lines

Physiological Role of Cyclic Electron Flow in Higher Plants

2012 ◽  
Vol 30 (1) ◽  
pp. 100
Author(s):  
Wei HUANG ◽  
Shi-Bao ZHANG ◽  
Kun-Fang CAO
Keyword(s):  
Higher Plants ◽  
Electron Flow ◽  
Physiological Role ◽  
Cyclic Electron Flow

Cyclic electron flow around photosystem I is enhanced at low pH

2014 ◽  
Vol 83 ◽  
pp. 194-199 ◽  
Author(s):  
Teena Tongra ◽  
Sudhakar Bharti ◽  
Anjana Jajoo
Keyword(s):  
Photosystem I ◽  
Electron Flow ◽  
Low Ph ◽  
Cyclic Electron Flow

scholarly journals ATP compartmentation in plastids and cytosol ofArabidopsis thalianarevealed by fluorescent protein sensing

2018 ◽  
Vol 115 (45) ◽  
pp. E10778-E10787 ◽  
Author(s):  
Chia Pao Voon ◽  
Xiaoqian Guan ◽  
Yuzhe Sun ◽  
Abira Sahu ◽  
May Ngor Chan ◽  
...  
Keyword(s):  
Arabidopsis Thaliana ◽  
Fluorescent Protein ◽  
Higher Plants ◽  
Electron Flow ◽  
Cyclic Electron Flow ◽  
Linear Electron ◽  
Protein Sensing ◽  
Atp Production ◽  
Respiratory Inhibitors ◽  
Sensor Protein

Matching ATP:NADPH provision and consumption in the chloroplast is a prerequisite for efficient photosynthesis. In terms of ATP:NADPH ratio, the amount of ATP generated from the linear electron flow does not meet the demand of the Calvin–Benson–Bassham (CBB) cycle. Several different mechanisms to increase ATP availability have evolved, including cyclic electron flow in higher plants and the direct import of mitochondrial-derived ATP in diatoms. By imaging a fluorescent ATP sensor protein expressed in livingArabidopsis thalianaseedlings, we found that MgATP2−concentrations were lower in the stroma of mature chloroplasts than in the cytosol, and exogenous ATP was able to enter chloroplasts isolated from 4- and 5-day-old seedlings, but not chloroplasts isolated from 10- or 20-day-old photosynthetic tissues. This observation is in line with the previous finding that the expression of chloroplast nucleotide transporters (NTTs) inArabidopsismesophyll is limited to very young seedlings. Employing a combination of photosynthetic and respiratory inhibitors with compartment-specific imaging of ATP, we corroborate the dependency of stromal ATP production on mitochondrial dissipation of photosynthetic reductant. Our data suggest that, during illumination, the provision and consumption of ATP:NADPH in chloroplasts can be balanced by exporting excess reductants rather than importing ATP from the cytosol.

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