| 外源铁对不同番茄品种生理特性、镉积累及化学形态的影响 |
| 摘要点击 3811 全文点击 1938 投稿时间：2013-01-13 修订日期：2013-03-10 |
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| 中文关键词 铁镉交互 生理特性 镉累积 镉形态 番茄品种 |
| 英文关键词 antagonism of iron and cadmium physiological characterization Cd accumulation Cd fractions tomato varieties |
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| 中文摘要 |
| 采用盆栽试验研究了重金属Cd (10 mg·kg-1)污染下,叶面喷施不同Fe浓度(0、50、100、200和400 μmol·L-1)对不同品种番茄生长、抗氧化酶活性及番茄体内Cd形态和积累量的影响. 结果表明,喷施Fe后,番茄干重、Cd含量和积累量在2个品种之间的差异达到了显著水平. Fe显著增加了2个番茄品种的果实、根、茎、叶及植株总干重. 随Fe浓度增加,2个品种根超过氧化物歧化酶(SOD)活性以及渝粉109根过氧化氢酶(CAT)活性先下降然后呈升高趋势,2个品种根过氧化物酶(POD)活性以及4641根CAT活性则先升高然后下降. 番茄果实中的Cd以FR>FHCl>FE>FNaCl>FHAC>FW. 适量的Fe减少了番茄果实中各形态Cd含量,但高量Fe(400 μmol·L-1)增加了4641果实中FHCl、FR以及渝粉109果实中FE、FNaCl、FR和Cd总提取量. 番茄Cd积累量以叶>茎>果实>根. 叶面喷施Fe使番茄叶、茎、根和果实中的Cd含量分别降低了7.1%~25.3%、30.8%~50.4%、13.0%~45.1%和2.8%~11.7%. 供试2个番茄品种,无论喷Fe与否,果实Cd含量及植株Cd总积累量以4641<渝粉109. |
| 英文摘要 |
| Pot experiments were carried out to investigate the influence of different iron (Fe) levels (0, 50, 100, 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 concentration and accumulation of Cd significantly differed between the two varieties of tomato tested. Dry weights of fruit, roots, stem, leaf, and plant increased in the presence of Fe. Activities of superoxide dismutase (SOD) of root in both varieties, and activities of catalase (CAT) of root in Yufen109 deceased at first, and then increased with increasing levels of Fe, but activities of peroxidase (POD) of root in both varieties and activities of CAT of root in 4641 increased at first, and then reduced with increasing levels of Fe. Chemical forms of Cd in fruit of tomato were in the order of FR>FHCl>FE>FNaCl>FHAC>FW. All chemical forms of Cd obviously decreased after the application of adequate Fe compared to the control, while FHCl and FR of 4641, and the total extractable Cd, FE, FNaCl and FR of Yufen109 increased at 400 μmol·L-1Fe treatment. Cadmium accumulations of tomato were in the order of leaf>stew>fruit>roots. Cadmium concentration in leaf, stem, roots and fruit of both varieties decreased by 7.1%-25.3%, 30.8%-50.4%, 13.0%-45.1% and 2.8%-11.7% in the presence of Fe when exposed to Cd, and the Cd concentration of fruit and Cd accumulations in plant were in the order of 4641 |
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