Light-Induced Ascorbate-Dependent Electron Transport and Membrane Energization in Chloroplasts of Bundle Sheath Cells of the C4 Plant Maize

2001 ◽  
Vol 385 (1) ◽  
pp. 145-153 ◽  
Author(s):  
Boris N. Ivanov ◽  
Colette A. Sacksteder ◽  
David M. Kramer ◽  
Gerald E. Edwards
Keyword(s):  
Electron Transport ◽  
Bundle Sheath ◽  
C4 Plant ◽  
Bundle Sheath Cells ◽  
Membrane Energization ◽  
Sheath Cells

scholarly journals Improving Light Use Efficiency in C4 Plants by Increasing Electron Transport Rate

Proceedings ◽  
2020 ◽  
Vol 36 (1) ◽  
pp. 203
Author(s):  
Maria Ermakova ◽  
Robert T. Furbank ◽  
Susanne von Caemmerer
Keyword(s):  
Electron Transport ◽  
Conversion Efficiency ◽  
C4 Photosynthesis ◽  
Foxtail Millet ◽  
Bundle Sheath ◽  
C4 Plants ◽  
Crop Species ◽  
Bundle Sheath Cells ◽  
Light Conversion Efficiency ◽  
Sheath Cells

C4 plants play a key role in world agriculture and strategies to manipulate and enhance C4 photosynthesis have the potential for major agricultural impacts. The C4 photosynthetic pathway is a biochemical CO2 concentrating mechanism that requires the coordinated functioning of mesophyll and bundle sheath cells of leaves. Chloroplast electron transport in C4 plants is shared between the two cell types; it provides resources for CO2 fixation therefore underpinning the efficiency of photosynthesis. Using the model monocot C4 species Setaria viridis (green foxtail millet) we demonstrated that the Cytochrome (Cyt) b6f complex regulates the electron transport capacity and thus the rate of CO2 assimilation at high light and saturating CO2. Overexpression of the Cyt b6f in both mesophyll and bundle sheath cells results in a higher electron throughput and allows better light conversion efficiency in both photosystems. Importantly, increased Cyt b6f abundance in leaves provides higher rates of C4 photosynthesis without marked changes in Rubisco or chlorophyll content. Our results demonstrate that increasing the rate of electron transport is a viable strategy for improving the light conversion efficiency in C4 crop species like maize and sorghum.

scholarly journals Overexpression of the Rieske FeS protein of the Cytochromeb6fcomplex increases C4photosynthesis

2019 ◽  
Author(s):  
Maria Ermakova ◽  
Patricia E. Lopez-Calcagno ◽  
Christine A. Raines ◽  
Robert T. Furbank ◽  
Susanne von Caemmerer
Keyword(s):  
Electron Transport ◽  
Cell Types ◽  
Bundle Sheath ◽  
Assimilation Rate ◽  
Higher Plant ◽  
Bundle Sheath Cells ◽  
Electron Transport Chains ◽  
Photosynthetic Complexes ◽  
Rieske Fes Protein ◽  
Sheath Cells

AbstractC4plants contribute 20% to the global primary productivity despite representing only 4% of higher plant species. Their CO2concentrating mechanism operating between mesophyll and bundle sheath cells increases CO2partial pressure at the site of Rubisco and hence photosynthetic efficiency. Electron transport chains in both cell types supply ATP and NADPH for C4photosynthesis. Since Cytochromeb6fis a key point of control of electron transport in C3plants, we constitutively overexpressed the Rieske FeS subunit inSetaria viridisto study the effects on C4photosynthesis. Rieske FeS overexpression resulted in a higher content of Cytochromeb6fin both mesophyll and bundle sheath cells without marked changes in abundances of other photosynthetic complexes and Rubisco. Plants with higher Cytochromeb6fabundance showed better light conversion efficiency in both Photosystems and could generate higher proton-motive force across the thylakoid membrane. Rieske FeS abundance correlated with CO2assimilation rate and plants with a 10% increase in Rieske FeS content showed a 10% increase in CO2assimilation rate at ambient and saturating CO2and high light. Our results demonstrate that Cytochromeb6fcontrols the rate of electron transport in C4plants and that removing electron transport limitations can increase the rate of C4photosynthesis.

scholarly journals Differential Sensitivity of Chloroplasts in Mesophyll and Bundle Sheath Cells in Maize, an NADP-Malic Enzyme-Type C4 Plant, to Salinity Stress

2005 ◽  
Vol 8 (5) ◽  
pp. 567-577 ◽  
Author(s):  
Rusdi Hasan ◽  
Youichiro Ohnuki ◽  
Michio Kawasaki ◽  
Mitsutaka Taniguchi ◽  
Hiroshi Miyake
Keyword(s):  
Salinity Stress ◽  
Malic Enzyme ◽  
Bundle Sheath ◽  
Differential Sensitivity ◽  
C4 Plant ◽  
Bundle Sheath Cells ◽  
Sheath Cells
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