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Tropical and sub-tropical higher plant species show marked growth inhibition when exposed to chilling temperatures. In root tip segments of coffee seedlings which were subjected for 6 days to temperatures of 10, 15, 20 and 25°C, in darkness, we have detected an increased amount of malondialdehyde formed in the 10°C treatment, accompanied by higher electrolyte leakage. The electron paramagnetic resonance...
Barley leaves were exposed for several min to a white light of photon flux density 1000 μmol m -2 s -1 , leading to a massive conversion of the xanthophyll violaxanthin to antheraxanthin and zeaxanthin in the absence of lipid peroxidation. Using electron spin resonance spectroscopy and different spin-labeled stearate probes, we observed that this light treatment noticeably...
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