Free radicals and metabolism associated with the acquisition and loss of desiccation tolerance in developing seeds.
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Cell Membrane↗
Biomedical subjects
N M Atherton
Publications and source records attributed to N M Atherton.
A free radical ubiquitously associated with senescence in plants: evidence for a quinone.
The interpretation of EPR and ENDOR measurements on an organic free radical which appears to be a universal concomitant of senescence in plants is discussed. On the basis of EPR spectra obtained at 95 GHz it is speculated that the radical is derived from a quinone.
Aging↗
Plants under drought-stress generate activated oxygen.
Lysed chloroplasts prepared from droughted wheat plants generate O2- on illumination as detected by electron spin resonance spectroscopy, the amplitude of the signal increasing with the severity of water deprivation. Following a similar time-course as radical formation and chlorophyll destruction, there was a significant increase in the accumulation of iron in the droughted shoots to reach an estimated concentration in the cell sap of about 2.5 mM. The evidence suggests that superoxide generated as a result of impaired electron transport in the chloroplasts reacts with the high concentration of accumulating iron resulting in the formation of hydroxyl radical, the probable cause of the primary pathologies observed in droughted plants.
Chloroplasts↗
Spectroscopic investigation of rubredoxin and ferredoxin.
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Electron Spin Resonance Spectroscopy↗