17 Result(s)
within
Christopher Preston
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Article
Paternal leakage inheritance and a fitness cost are associated with the chloroplastic psbA gene controlled metribuzin tolerance in lentil (Lens culinaris)
Reciprocal F1, F2 and F3 populations of lentil (Lens culinaris Medik.) were developed by crossing between lines, with a chloroplastic psbA gene mutation conferring tolerance to the photosystem II inhibitor herbic...
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Article
A novel insight into the mode of action of glufosinate: how reactive oxygen species are formed
Glufosinate targets glutamine synthetase (GS), but its fast herbicidal action is triggered by reactive oxygen species (ROS). The relationship between GS inhibition and ROS accumulation was investigated in Amarant...
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Article
Open AccessResistance of flaxleaf fleabane (Conyza bonariensis (L.) Cronquist) to glyphosate
Resistance to glyphosate has been reported in flaxleaf fleabane populations within a number of grain growing areas in southern Queensland and northern New South Wales and other crop** regions across Australia.
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Article
Open AccessGenetic diversity and spread of glyphosate-resistant flaxleaf fleabane
Continual application of herbicides for flaxleaf fleabane control readily results in the evolution of herbicide resistance. Flaxleaf fleabane has evolved resistance to different modes of action herbicides in m...
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Article
Reactive oxygen species trigger the fast action of glufosinate
Glufosinate is primarily toxic to plants due to a massive light-dependent generation of reactive oxygen species rather than ammonia accumulation or carbon assimilation inhibition.
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Article
Addressing Socio-Economic and Ethical Considerations in Biotechnology Governance: The Potential of a New Politics of Care
There is a growing demand to incorporate social, economic and ethical considerations into biotechnology governance. However, there is currently little guidance available for understanding what this means or ho...
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Article
Gene amplification of 5-enol-pyruvylshikimate-3-phosphate synthase in glyphosate-resistant Kochia scoparia
Field-evolved resistance to the herbicide glyphosate is due to amplification of one of two EPSPS alleles, increasing transcription and protein with no splice...
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Article
Predicting the Spread of Herbicide Resistance in Australian Canola Fields
A common concern expressed about the commercial release of transgenic canola into crop** systems is the risks of unwanted gene flow between varieties. Experimental data is emerging that answers some of the t...
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Article
UK field-scale evaluations answer wrong questions
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Article
Light-dependent enhanced metabolism of chlorotoluron in a substituted urea herbicide-resistant biotype ofLolium rigidum Gaud.
A population ofLolium rigidum Gaud. displays resistance to the herbicide chlorotoluron endowed by enhanced metabolism of this herbicide. The level of resistance in intact plants of this population is light depend...
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Article
The mechanism of resistance to paraquat is strongly temperature dependent in resistant Hordeum leporinum Link and H. glaucum Steud.
Paraquat-resistant biotypes of the closely-related weed species Hordeum leporinum Link and H. glaucum Steud. are highly resistant to paraquat when grown during the normal winter growing season. However, when grow...
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Chapter
The Primary Charge-Separation Rate in Isolated Photosystem II Reaction Center Complex
The primary charge-separation act in isolated bacterial reaction center (RC) complex occurs in 2.8 ps at room temperature and 0.7–1.2 ps at 10K [see refs. in 1]. Because of similarities between the bacterial a...
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Chapter
Partial Identification of the High-Affinity MN-Binding Site in Scenedesmus obliquus Photosystem II
The photosynthetic O2-evolving system is a complex metallo-enzyme with four bound Mn atoms per reaction center [1,2]. At present the binding sites of these Mn are not known; however, there is considerable evidenc...
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Article
Regeneration of the high-affinity manganese-binding site in the reaction center of an oxygen-evolution deficient mutant of Scenedesmus by protease action
The O2-evolution deficient mutant (LF-1) of Scenedesmus obliquus inserts an unprocessed D1 protein into the thylakoid membrane and binds less than half the wild type (WT) level of Mn. LF-1 photosystem II (PS II) ...
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Article
Determination of the primary charge separation rate in Photosystem II reaction centers at 15 K
We have measured the rate constant for the formation of the oxidized chlorophyll a electron donor (P680+) and the reduced electron acceptor pheophytin a − (Pheo a −) following excitation of isolated Photosystem I...
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Article
Interaction of electron acceptors with thylakoids from halophytic and non-halophytic species
Thylakoid membranes isolated from halophytic species showed differences in their interactions with ionic and lipophilic electron acceptors when compared to thylakoids from non-halophytes. FeCN was considerably...
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Chapter
Differential Thylakoid Membrane Stacking in Mangrove and Spinach
Stacking of isolated thylakoid membranes in vitro requires the addition of cations (1–4). Divalent cations are effective in inducing grana formation at lower concentrations than monovalent cations (3). This catio...
