Expected and Unexpected Effects of Mutations Conferring Herbicide Resistance on Photosystem II Activity in Synechocystis PCC 6714 and 6803

1992 ◽  
pp. 575-578
Author(s):  
C. Astier ◽  
G. Ajlani ◽  
I. Perewoska ◽  
M. Picaud ◽  
C. Vernotte
Keyword(s):  
Photosystem Ii ◽  
Herbicide Resistance ◽  
Photosystem Ii Activity ◽  
Synechocystis Pcc 6714

Structural Analysis of the QB Pocket of the D 1 Subunit of Photosystem II in Synechocystis PCC 6714 and 6803

1993 ◽  
Vol 48 (3-4) ◽  
pp. 199-204 ◽  
Author(s):  
Chantal Astier ◽  
Irene Perewoska ◽  
Martine Picaud ◽  
Diana Kirilovsky ◽  
Keyword(s):  
Amino Acid ◽  
Photosystem Ii ◽  
Binding Site ◽  
Herbicide Resistance ◽  
Point Mutations ◽  
Amino Acid Substitutions ◽  
Amino Acid Residues ◽  
Oscillatory Pattern ◽  
Mutant Phenotypes ◽  
Synechocystis Pcc 6714

Abstract Various herbicides inhibit photosynthesis by displacing the second electron acceptor QB from its binding site at the D 1 protein. Different amino acid substitutions within this binding site have been found to reduce herbicide affinities, thereby conferring herbicide resistance. In Synechocystis PCC 6714 we have selected 7 single mutants and 6 double mutants resistant to various herbicides due to amino acid substitutions at different positions in the QB pocket. Characterization of these mutants consists in molecular determination of the mutations in the psbAl genes and in transformation of Synechocystis PCC 6803 by the cloned mutated genes to analyze the role of the mutations in the mutant phenotypes. Comparison with equivalent Chlamydomonas mutants is presented. These studies allow us to specify the interactions of several amino acid residues with herbicides and QB and with each other. Furthermore some Synechocystis mutants present additional characteristics such as an increased sensitivity to photoinhibition, or resistance to formate or modification of the oscillatory pattern of oxygen evolution. Among the 6 point-mutations giving herbicide resistance, only those located at the limit of the loop and the parallel helix produced additional effects on photosystem II function.

The PsbJ protein is required for photosystem II activity in centers lacking the PsbO and PsbV lumenal subunits

2021 ◽  
Author(s):  
Priscilla Choo ◽  
Jack A. Forsman ◽  
Liangliang Hui ◽  
Ei Phyo Khaing ◽  
Tina C. Summerfield ◽  
...  
Keyword(s):  
Photosystem Ii ◽  
Photosystem Ii Activity

Inhibitions of photosystem II activity by proton gradient

1994 ◽  
Vol 1185 (3) ◽  
pp. 279-283 ◽  
Author(s):  
Alexander M. Ehrenheim ◽  
Giovanni Finazzi ◽  
Giorgio Forti
Keyword(s):  
Photosystem Ii ◽  
Proton Gradient ◽  
Photosystem Ii Activity

Changes in Photosystem II Activity and Leaf Reflectance Features of Several Subtropical Woody Plants Under Simulated SO2Treatment

2006 ◽  
Vol 48 (11) ◽  
pp. 1274-1286 ◽  
Author(s):  
Nan Liu ◽  
Chang-Lian Peng ◽  
Zhi-Fang Lin ◽  
Gui-Zhu Lin ◽  
Ling-Ling Zhang ◽  
...  
Keyword(s):  
Photosystem Ii ◽  
Woody Plants ◽  
Leaf Reflectance ◽  
Photosystem Ii Activity

scholarly journals Appreciation of tolerance at the impact of thermal stress on photosystem ii activity in the leaves of pedunculate oak (Quercus robur L.) trees of different ecological origin

2021 ◽  
Vol 13 (1(22)) ◽  
pp. 13-20
Author(s):  
Petru Cuza ◽  
Keyword(s):  
Thermal Stress ◽  
Photosystem Ii ◽  
Quercus Robur ◽  
Central Area ◽  
Extreme Weather Events ◽  
Pedunculate Oak ◽  
Adaptation Capacity ◽  
Oak Trees ◽  
Photosystem Ii Activity ◽  
The Impact

Extreme weather events with high temperatures and strong sunlight have increased alarmingly in the last few decades, considerable affecting plant photosynthesis. In this study, the impact of thermal stress on photosystem II activity in the leaves of pedunculate oak trees (Quercus robur L.) of different ecological origin was assessed. Four days after the thermal shock application with a temperature of 50°C during 20, 40, 60 minutes, the processes of recovery on photosystem II activity in the leaves of the oak trees in the investigated provenances took place with different speed and fullness. The recovery of the functional state of photosystem II in the leaves of the trees showed that in the environmental conditions of the ,,Plaiul Fagului” reservation territory an advanced thermotolerance to the thermal stress action was specifi c for the origin from the north of the country (Edinet). The leaves of the trees of local and southern origin showed a low resistance to the thermal stress action. The advanced adaptation capacity, the high growth rate of the trees from the northern provenance suggest that the acorn harvested from the oaks of northern origin can be used for the works of extension of the afforestation areas in the central area of the Republic of Moldova.

Flower Induction in Seedlings of Asparagus officinalis L. by N-Phenylcarbamates

1989 ◽  
Vol 44 (3-4) ◽  
pp. 226-232 ◽  
Author(s):  
Keiko Yanosaka ◽  
Hajime Iwamura ◽  
Toshio Fujita
Keyword(s):  
Photosystem Ii ◽  
Seedling Stage ◽  
Flower Induction ◽  
Asparagus Officinalis ◽  
Dioecious Plant ◽  
Male And Female ◽  
Flowering Induction ◽  
Cross Breeding ◽  
Photosystem Ii Activity ◽  
Female Flowers

Abstract A series of N-phenylcarbamates induced flowers in one-month-old seedlings of Asparagus officinalis L. Ninety to 100% of the plants flowered when the seeds were germinated in the presence of the most potent members of this class. The flowering occurred only once at the top of the seedlings, which then continued to grow normally. This made it possible to select the commer­cially preferred m ales of this dioecious plant at the seedling stage. Both male and female flowers were fertile, so cross-breeding was possible between flowering seedlings as well as between flowering seedlings and adults that had grown normally. Activity of flowering induction was not related with inhibition of photosystem II activity.

The Use of O2-Evolving Subchloroplast Particles to Study Acceptor and Inhibitor Sites on the Reducing Side of Photosystem II

1983 ◽  
Vol 38 (9-10) ◽  
pp. 793-798 ◽  
Author(s):  
W. S. Cohen ◽  
J. R. Barton
Keyword(s):  
Electron Transfer ◽  
Electron Transport ◽  
Photosystem Ii ◽  
Differential Sensitivity ◽  
Electron Transfer Chain ◽  
Plastoquinone Pool ◽  
Photosystem Ii Activity ◽  
Transfer Chain ◽  
Photosynthetic Electron Transfer ◽  
Photosystem Ii Particles

Photosystem II particles that retain the ability to evolve O2 have been used to examine acceptor and inhibitor sites in the photosynthetic electron transfer chain between Q and plastoquinone. Employing the water to dichlorobenzoquinone reaction to assay photosystem II activity, we have demonstrated that electron transport in thylakoids and particles is equally sensitive to inhibition by DCMU. dinoseb, metribuzin, HQNO and DBMIB. Based on differential sensitivity to inhibition by DCMU vs. HQNO or DBMIB, we suggest that when synthetic quinones, e.g. 2,6-dichlorobenzoquinone operate as Hill reagents in particles they are reduced primarily by the plastoquinone pool. When synthetic quinones, e.g. 5,6-methylenedioxy-2,3-dimethyl benzoquinone act as autoxidizable acceptors they accept electron from the Q/B complex at a point that is located between the DCMU and HQNO (DBMIB) inhibition sites.

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