摘要
采用盆栽试验研究了烤烟（Nicotiana tabacum L.）对不同浓度外源砷吸收和累积特性的影响。结果表明,外源砷浓度增加到50 mg/kg时对烤烟干物质量的影响不显著,而增加到100 mg/kg时烤烟干物质量比对照降低了16.59%。烤烟不同部位砷的浓度变化规律为根（1.38-3.87 mg/kg）〉下部叶（0.80-2.18mg/kg）〉中部叶（0.55-1.21 mg/kg）〉茎（0.31-1.35 mg/kg）〉上部叶（0.61-0.96 mg/kg）〉芽（0.31-0.55 mg/kg）。砷不同部位分布比例规律为下部叶（25.07%-35.35%）〉茎（16.84%-26.64%）〉根（15.23%-25.88%）〉中部叶（11.84%-14.18%）〉上部叶（7.20%-12.08%）〉芽（3.22%-6.53%）。提高外源砷的浓度可以增加下部叶和茎部砷的累积。随着外源砷浓度的增加烤烟富集系数逐渐降低,而转移系数却呈现出先降低后增加的变化趋势。
Pot experiment was conducted to study the arsenic absorption and accumulation of flue-cured tobacco（Nicotiana tabacum L.）. The results showed that there was no significant difference of dry matter of flue-cured tobacco with the arsenic concentration less than 50 mg / kg. The dry matter decreased by 16.59% compared with control when it was treated with 100 mg / kg arsenic. The sequence of arsenic concentrations on different flue-cured tobacco parts was in the order of roots（1.38-3.87 mg / kg） 〉lower leaf（0.80-2.18 mg / kg）.〉 middle leaf（0.55-1.21 mg / kg） 〉stem（0.31-1.35 mg / kg）〉 upper leaf（0.61-0.96 mg / kg） 〉bud（0.31-0.55 mg / kg）. Arsenic distribution ratios on different flue-cured tobacco parts was in the order of lower leaf（25.07%-35.35%）〉stem（16.84%-26.64%）〉roots（15.23%-25.88%） 〉middle leaf（11.84%-14.18%） 〉upper leaf（7.20%-12.08%） 〉bud（3.22%-6.53%）. The increased arsenic concentration increased arsenic accumulation in lower leaf and stem part of flue-cured tobacco. As the arsenic concentration increased, the accumulation factor of flue-cured tobacco had a gradual reducing trend. The translocation factor decreased firstly and then increased.
出处
《湖北农业科学》
北大核心
2014年第22期5375-5378,共4页
Hubei Agricultural Sciences
基金
湖北省烟草公司科技项目(027Y2011-055)
湖北省农业科技创新中心项目(2011-620-003-03-05)
