Results (
Thai) 2:
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The root apex of ASVEG #6 was observed to be brownish
in color after 6 h of flooding, whereas those of L4422,
EG117 and EG203 appeared brownish after 48 h of flooding.
Early flooding did not have any harmful effects on tops
of the tomato plants. Yet, with prolonged flooding stress,
particularly when significant flooding-injury in appearance
occurred, total ASA amount of oxy-radical production increased.
These observations suggest that the roots of the
tomato plants become more sensitive to flooding and that
oxidative processes may be associated with this sensitivity.
The degree and speed of flooding-injury seem to be the
result of an accumulation of total ASA (Fig. 7). In short,
oxidative damage may be one of the factors that causes
brownish discoloration or decay of the roots of the plants.
Different plant genotypes may prepare for oxidative injury
by up-regulating their antioxidase activity and/or antioxidant
capacity during waterlogged conditions, and that APX, reduced
ASA, total ASA, GSH, total glutathione and reduced
ASA were involved in this process (Figs. 1, 5, 7, 10, and 11).
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