EFFECTS OF ATRAZINE CONCENTRATIONS ON THE HILL REACTION IN ISOLATED CHLOROPLASTS OF TRIAZINE-RESISTANT AND SUSCEPTIBLE OILSEED RAPE (Brassica napus AND B. campestris) GENOTYPES

1981 ◽  
Vol 61 (3) ◽  
pp. 723-726 ◽  
Author(s):  
J. WEISS ◽  
W. D. BEVERSDORF
Keyword(s):  
Brassica Napus ◽  
Oilseed Rape ◽  
Brassica Campestris ◽  
Hill Reaction ◽  
The Hill ◽  
Isolated Chloroplasts

Effects of atrazine concentrations (10−7 to 10−4 M) on the Hill reaction were evaluated using isolated chloroplasts from parentals, F1 and BC3 of triazine-resistant biotype of bird’s-rape (Brassica campestris) × B. napus ’Tower’ and bird’s-rape × B. campestris ’Torch’. Atrazine did not affect the Hill reaction of bird’s-rape, hybrids or BC3 with cytoplasm from the triazine-resistant bird’s-rape, but interfered with the Hill reaction in triazine-susceptible Tower and Torch.

INTERPRETATIONS OF THE CARBON DIOXIDE DEPENDENCE OF THE HILL REACTION

1965 ◽  
Vol 43 (1) ◽  
pp. 119-127 ◽  
Author(s):  
Norman E. Good
Keyword(s):  
Carbon Dioxide ◽  
Quantum Theory ◽  
Hill Reaction ◽  
Oxygen Production ◽  
Quantum Mechanism ◽  
Photosynthetic Oxygen ◽  
The One ◽  
A Site ◽  
The Hill ◽  
Isolated Chloroplasts

Heretofore Warburg's one-quantum theory of photosynthesis has seemed inconsistent with the existence of the Hill reaction. The one-quantum theory states that massive oxygen uptake and CO2 release are preconditions of photosynthetic oxygen production, yet isolated chloroplasts produce oxygen at high rates apparently without consuming any oxygen or producing any CO2. Warburg has attempted to resolve the dilemma by pointing out a CO2 dependence of the Hill reaction. On the basis of this observation he proposed a reinterpretation of the Hill reaction which is consistent with the one-quantum theory. The effect of CO2 on isolated chloroplasts has been confirmed and some of the conditions which are necessary for the demonstration of the effect have been defined. It is not clear if CO2 is actually metabolized as Warburg claims. Contrary to Warburg's model, its participation seems to be at a site remote from the photochemical act. A number of other reasons for doubting the reality of the one-quantum mechanism are presented.

Interference of Herbicides with the Hill Reaction of Isolated Chloroplasts

Weeds ◽  
1962 ◽  
Vol 10 (3) ◽  
pp. 229 ◽  
Author(s):  
D. E. Moreland ◽  
K. L. Hill
Keyword(s):  
Hill Reaction ◽  
The Hill ◽  
Isolated Chloroplasts

Genetic Analysis of Chloroplast Atrazine Resistance in Brassica campestris – Cytoplasmic Inheritance

Weed Science ◽  
1982 ◽  
Vol 30 (3) ◽  
pp. 281-285 ◽  
Author(s):  
V. Souza Machado ◽  
J. D. Bandeen
Keyword(s):  
Genetic Analysis ◽  
Genetic Marker ◽  
Brassica Campestris ◽  
Female Parent ◽  
Backcross Progeny ◽  
Cytoplasmic Inheritance ◽  
Hill Reaction ◽  
Triazine Resistance ◽  
Atrazine Resistance ◽  
The Hill

Analysis of reciprocal F1, F2, F3, and backcross progeny from crosses between atrazine [2-chloro-4-(ethylamino)-6-(isopropylamino)-s-triazine]-resistant and several susceptible genotypes of Brassica campestris L. indicated that triazine resistance was inherited cytoplasmically from the female parent. A partially dominant chlorotic cotyledon was used as a genetic marker to confirm true hybrids in the reciprocal F1 progenies. Phytotoxicity of atrazine was correlated with loss of the Hill reaction.

Light Saturation of Growth and Photosynthesis of the Shade Plant Marchantia Polymorpha

1973 ◽  
Vol 12 (2) ◽  
pp. 391-401
Author(s):  
R. MACHE ◽  
S. LOISEAUX
Keyword(s):  
Growth Rate ◽  
Photosystem Ii ◽  
Light Intensity ◽  
Marchantia Polymorpha ◽  
Hill Reaction ◽  
Light Saturation ◽  
Shade Plant ◽  
Low Illumination ◽  
The Hill ◽  
Isolated Chloroplasts

The growth rate of the shade plant Marchantia was at its maximum for a low illumination, 2-3 x 103 lx, and was inhibited by an excess of light. Photosynthesis by intact thalli and by isolated chloroplasts of Marchantia was saturated by a light intensity of 2-3 x 103 lx. These isolated chloroplasts were able to carry on satisfactory rates of photosynthesis, up to 35 µM CO2/h/mg chlorophyll. The Hill reaction and photosystem II were also saturated by the same light intensities, demonstrating that the factor limiting the light saturation of photosynthesis is located in the chloroplast. The structure of chloroplasts was strongly modified by an excess of light, small grana and fret membranes being replaced by continuous grana.

On a new inhibitor of photosynthetic electron-transport in isolated chloroplasts

1970 ◽  
Vol 25 (10) ◽  
pp. 1157-1159 ◽  
Author(s):  
A. Trebst ◽  
E. Harth ◽  
W. Draber
Keyword(s):  
Electron Transport ◽  
Photosystem Ii ◽  
Photosystem I ◽  
Photosynthetic Electron Transport ◽  
Hill Reaction ◽  
High Concentration ◽  
Ferricyanide Reduction ◽  
The Hill ◽  
Photosystem I And Ii ◽  
Isolated Chloroplasts

A halogenated benzoquinone has been found to inhibit the photosynthetic electron transport system in isolated chloroplasts. 2·10-6ᴍ of dibromo-thymoquinone inhibit the Hill- reaction with NADP, methylviologen or anthraquinone to 100%, but do not effect the photoreduction of NADP at the expense of an artificial electron donor. The Hill - reaction with ferricyanide is inhibited even at the high concentration of 2·10-5ᴍ of dibromo-thymoquinone to only 60%. The remaining reduction in the presence of the inhibitor reflects the rate of ferricyanide reduction by photosystem II. It is concluded that the inhibition of electron transport by the quinone occurs between photosystem I and II and close to or at the functional site of plastoquinone.

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