关键词: 番茄, 铁镉交互, 抗氧化酶, 镉累积, 镉形态

Abstract: Pot experiments were carried out to investigate the influence of different iron（Fe）levels
（0，200 and 400 μmol · L-1）on the plant growth，activities of antioxidant enzymes，accumulation and
chemical forms of cadmium（Cd）in tomato when exposed to Cd（10 mg · kg-1）. The results showed that
dry weights of fruit，roots，stem，leaf and plant，and concentrations and accumulation of Cd significantly
differed between two varieties of tomato. Dry weights of fruit，roots，stem，leaf and plant increased in the presence of Fe. Photosynthetic rate（Pn），stomatal conductance（Gs）and transpiration rate（Tr）in both
varieties，and activity of peroxidase（POD）in‘Yufen109’，and activity of catalase（CAT）in‘4641’
increased at first，and then decreased with increasing levels of Fe，while intercellular carbon dioxide
concentration（Ci）in both varieties，activity of superoxide dismutase（SOD）in‘Yufen109’decreased
at first，and then increased with increasing levels of Fe. The contents of chemical forms of Cd in fruit of
tomato were in order of residual Cd（FR）> hydrochloric acid-extractable Cd（FHCl）> ethanol-extractable
Cd（FE）> sodium chloride-extractable Cd（FNaCl）> acetic acid-extractable Cd（FHAc）> deionized
water-extractable Cd（FW）. All chemical forms of Cd significantly decreased after the application of
adequate Fe（200 μmol · L-1）compared to the control. However，FHCl and FR of‘4641’，and the total
extractable Cd，FE，FNaCl and FR of‘Yufen109’increased at 400 μmol · L-1 Fe treatment. Cadmium
accumulations in tomato were in order of leaf > stem > fruit > roots. Cadmium concentrations in leaf，
stem，roots and fruit of both varieties decreased by 7.1%–21.9%，35.6%–50.4%，13.1%–37.0% and
2.8%–8.2% in the presence of Fe when exposed to Cd，respectively. Cadmium concentrations，and Cd
accumulation in fruit and plant were in order of ‘4641’<‘Yufen109’in the presence or absence of Fe.

Key words: tomato, antagonism of iron and cadmium, activities of antioxidant enzymes, Cd accumulation, Cd fractions