Changes in the chlorophyll fluorescence parameters and superoxide dismutase activity during heat shock treatment and the recovery period in tomato plants
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Abstract
heat shock of 45oC for two and three hours. After stress
conditions, a group of plants was recovered under normal
growth conditions of temperature of 25/20oC day/night, relative
humidity of 60 % and a photon flux density of 250 ?mol
photons.m-2.s-1 PAR. Furthermore, they were recovered at 25oC
for 20 hours. An initial fluorescence increase and a variable
fluorescence decrease were detected in stressed plants by
both stress conditions. A photochemical efficiency decrease
was noted during stress. After the recovery period (20 hours),
fluorescence parameters showed a significant recovery, except
the photochemical efficiency. SOD total activity was reduced
by heat shock; however, several isoenzymes did not show a
similar sensitivity to high temperature. Fe-SOD showed
resistance to high temperature, whereas Cu/Zn-SOD was
thermosensible. Thus, 20 hours of recovery were considered
sufficient to restore SOD activity.
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