Turnover of D1 Protein Encoded by psbA Gene in Higher Plants and Cyanobacteria Sustains Photosynthetic Efficiency to Maintain Plant Productivity Under Photoinhibitory Irradiance

2000 ◽  
Vol 38 (2) ◽  
pp. 161-169 ◽  
Author(s):  
M. Singh
Keyword(s):  
Photosynthetic Efficiency ◽  
Higher Plants ◽  
D1 Protein ◽  
Plant Productivity ◽  
Psba Gene

scholarly journals LOW PHOTOSYNTHETIC EFFICIENCY 1 is required for light-regulated photosystem II biogenesis inArabidopsis

2018 ◽  
Vol 115 (26) ◽  
pp. E6075-E6084 ◽  
Author(s):  
Honglei Jin ◽  
Mei Fu ◽  
Zhikun Duan ◽  
Sujuan Duan ◽  
Mengshu Li ◽  
...  
Keyword(s):  
Electron Transport ◽  
Photosystem Ii ◽  
Photosynthetic Efficiency ◽  
Higher Plants ◽  
D1 Protein ◽  
Mrna Translation ◽  
Photosynthetic Electron Transport ◽  
Dependent Manner ◽  
Pentatricopeptide Repeat ◽  
Ppr Protein

Photosystem II (PSII), a multisubunit protein complex of the photosynthetic electron transport chain, functions as a water-plastoquinone oxidoreductase, which is vital to the initiation of photosynthesis and electron transport. Although the structure, composition, and function of PSII are well understood, the mechanism of PSII biogenesis remains largely elusive. Here, we identified a nuclear-encoded pentatricopeptide repeat (PPR) protein LOW PHOTOSYNTHETIC EFFICIENCY 1 (LPE1; encoded by At3g46610) inArabidopsis, which plays a crucial role in PSII biogenesis. LPE1 is exclusively targeted to chloroplasts and directly binds to the 5′ UTR ofpsbAmRNA which encodes the PSII reaction center protein D1. The loss ofLPE1results in less efficient loading of ribosome on thepsbAmRNA and great synthesis defects in D1 protein. We further found that LPE1 interacts with a known regulator ofpsbAmRNA translation HIGH CHLOROPHYLL FLUORESCENCE 173 (HCF173) and facilitates the association of HCF173 withpsbAmRNA. More interestingly, our results indicate that LPE1 associates withpsbAmRNA in a light-dependent manner through a redox-based mechanism. This study enhances our understanding of the mechanism of light-regulated D1 synthesis, providing important insight into PSII biogenesis and the functional maintenance of efficient photosynthesis in higher plants.

Engineered ectopic expression of the psbA gene encoding the photosystem II D1 protein in Synechocystis sp. PCC6803

2007 ◽  
Vol 92 (3) ◽  
pp. 315-325 ◽  
Author(s):  
Madhavi Kommalapati ◽  
Hong Jin Hwang ◽  
Hong-Liang Wang ◽  
Robert L. Burnap
Keyword(s):  
Photosystem Ii ◽  
Ectopic Expression ◽  
D1 Protein ◽  
Psba Gene ◽  
Gene Encoding ◽  
Synechocystis Sp

scholarly journals Demonstration of a relationship between state transitions and photosynthetic efficiency in a higher plant

2019 ◽  
Vol 476 (21) ◽  
pp. 3295-3312 ◽  
Author(s):  
Craig R. Taylor ◽  
Wim van Ieperen ◽  
Jeremy Harbinson
Keyword(s):  
Photosynthetic Efficiency ◽  
State Transition ◽  
Higher Plants ◽  
Photosynthetic Apparatus ◽  
State Transitions ◽  
Short Term ◽  
Higher Plant ◽  
Series Configuration ◽  
Use Efficiency ◽  
Sun And Shade

A consequence of the series configuration of PSI and PSII is that imbalanced excitation of the photosystems leads to a reduction in linear electron transport and a drop in photosynthetic efficiency. Achieving balanced excitation is complicated by the distinct nature of the photosystems, which differ in composition, absorption spectra, and intrinsic efficiency, and by a spectrally variable natural environment. The existence of long- and short-term mechanisms that tune the photosynthetic apparatus and redistribute excitation energy between the photosystems highlights the importance of maintaining balanced excitation. In the short term, state transitions help restore balance through adjustments which, though not fully characterised, are observable using fluorescence techniques. Upon initiation of a state transition in algae and cyanobacteria, increases in photosynthetic efficiency are observable. However, while higher plants show fluorescence signatures associated with state transitions, no correlation between a state transition and photosynthetic efficiency has been demonstrated. In the present study, state 1 and state 2 were alternately induced in tomato leaves by illuminating leaves produced under artificial sun and shade spectra with a sequence of irradiances extreme in terms of PSI or PSII overexcitation. Light-use efficiency increased in both leaf types during transition from one state to the other with remarkably similar kinetics to that of F′m/Fm, F′o/Fo, and, during the PSII-overexciting irradiance, ΦPSII and qP. We have provided compelling evidence for the first time of a correlation between photosynthetic efficiency and state transitions in a higher plant. The importance of this relationship in natural ecophysiological contexts remains to be elucidated.

A New psbA Mutation Yielding an Amino-Acid Exchange at the Lumen-Exposed Site of the D1 Protein

1999 ◽  
Vol 54 (11) ◽  
pp. 909-914 ◽  
Author(s):  
C. Schwenger-Erger ◽  
N. Böhnisch ◽  
W. Barz
Keyword(s):  
Amino Acid ◽  
D1 Protein ◽  
Resistant Cell ◽  
Complete Sequence ◽  
Psba Gene ◽  
Amino Acid Exchange ◽  
Sequence Analyses ◽  
Gene Coding ◽  
Resistance Patterns ◽  
Acid Exchange

Abstract In eight metribuzin-resistant photoautotrophic cell cultures of Chenopodium rubrum (Thiemann and Barz, 1994 a, b) sequence analyses of a part of the psbA gene coding for the photosystem -II D1 protein had revealed different double and triple mutations within the herbicide binding niche of the protein (Schwenger-Erger et al., 1993). Two pairs of the exam­ined cell lines carried identical mutations within this part of the protein, although their growth performance and their herbicide resistance patterns were different, both at the cellu­lar and the thylakoid level. Starting from the known part of the psbA gene we have amplified the remaining psbA sequences using inverse polymerase chain reaction. Thus the complete sequence of the coding part of the gene was elucidated. After sequence analyses we found an additional amino acid exchange at the position 184 (ile → asn) of the D1 protein in cell line L1. Metabolic consequences of this mutation are discussed. Partial sequence analyses of the psbD gene of the herbicide resistant cell culture lines revealed no mutation within that part o f the D2 protein, which is in direct contact with the D1 protein.

A New Ioxynil-Resistant Mutant in Synechocystis PCC 6714: Hypothesis on the Interaction of Ioxynil with the D1 Protein

1990 ◽  
Vol 45 (5) ◽  
pp. 436-440 ◽  
Author(s):  
S. Creuzet ◽  
G. Ajlani ◽  
C. Vernotte ◽  
C. Astier
Keyword(s):  
Amino Acids ◽  
Amino Acid ◽  
D1 Protein ◽  
Resistant Mutant ◽  
Hydroxyl Group ◽  
Amino Acid Substitutions ◽  
Psba Gene ◽  
Molecular Models ◽  
Gene Encoding ◽  
Synechocystis Pcc 6714

A new Synechocystis 6714 mutant, loxIIA, resistant to the phenol-type herbicide ioxynil was isolated and characterized. The mutation found in the psbA gene (encoding the D1 photosystem II protein) is at the same codon 266 as for the first ioxynil-resistant mutant IoxIA previously selected [G. Ajlani. I. Meyer, C. Vernotte. and C. Astier, FEBS Lett. 246, 207-210 (1989)]. In IoxIIA, the change of Asn 266 to Asp gives a 3 × resistance, whereas in IoxIA, the change of the same amino acid to Thr gives a 10 × resistance. The effect of these different amino acid substitutions on the ioxynil resistance phenotype has allowed us to construct molecular models and calculate the hydrogen-bonding energies between the hydroxyl group of ioxynil and the respective amino acids at position 266.

scholarly journals Implications of mycorrhiza for biogeochemical cycling and coexistance of soil microbiota- a modelling study

2020 ◽  
Author(s):  
Frank Berninger
Keyword(s):  
Nitrogen Uptake ◽  
Mycorrhizal Fungi ◽  
Higher Plants ◽  
Inorganic Nitrogen ◽  
Environmental Parameters ◽  
Plant Productivity ◽  
Nitrogen Transfer ◽  
Wide Range ◽  
Fixed Proportion ◽  
Mycorrhizal Plants

Ectomycorrhizae are widespread symbionts of higher plants. However, their benefits for plant productivity and growth have not been well demonstrated since many studies do not suggest any improvement of plant growth or of plant nutrition for mycorrhizal plants. We use mechanistic modelling based on the population dynamics of decomposers to simulate the coexistence of mycorrhizal and non-mycorrhizal plants as well as the development of the soil decomposer community. The model assumed a fixed stoichiometry of each decomposer functional type. Decomposer growth depended on its carbon and nitrogen uptake. For mycorrhiza a part of the carbon is modelled to be supplied from the plant while a fixed proportion of the mycorrhizal nitrogen uptake is translocated to the plant. Carbon nitrogen ratios of decomposers were adjusted mineralization of nitrogen or overflow respiration of carbon. The results suggest that mycorrhizal plants do often outcompete non-mycorrhizal plants at no or little improvement of plant productivity. The main mechanism of mycorrhizal dominance is a reduction of the soil inorganic nitrogen pool and a rerouting of the nitrogen uptake of plants to the transfer nitrogen transfer from mycorrhizae to plants. On the other hand carbon subsidies from the trees allow to expand the niche of mycorrhizal fungi and to outcompete saprohytic fungi under a wide range of physiological and environmental parameters. This leads to dominance of mycorrhizal plants under a broad range of conditions and parameters including low transfer rates of nitrogen from the mycorrhiza to the plant, and low allocation of the plants to mycorrhiza.

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