Trace elements present in airborne particulate matter鈥擲tressors of plant metabolism

详细信息	查看全文 | 推荐本文 |

• 作者：Milan Pavlí ; k^a ; Daniela Pavlí ; ková ; ^b ; ^{pavlikova@af.czu.cz} ; Veronika Zemanová ; ^b ; Franti&scaron ; ek Hnili膷ka^c ; Veronika Urbanová ; ^b ; Ji艡ina Szá ; ková ; ^b
• 关键词：Airborne particulate matter ; Amino acids ; Gas-exchange parameters ; Lactuca serriola L. ; Toxic elements
• 刊名：Ecotoxicology and Environmental Safety
• 出版年：2012
• 期刊代码：77_01476513
• 类别：env
• 出版时间：1 May, 2012
• 卷：79
• 期：Complete
• 页码：101-107
• 文件大小：317 K

摘要

Changes of amino acid concentrations (glutamic acid, glutamine, asparagine, aspartate, proline, tryptophan, alanine, glycine, valine and serine), gas-exchange parameters (net photosynthetic rate, transpiration rate, stomatal conductance and intercellular CO₂ concentration) and nitrate levels in m>Lactuca serriolam> L. under airborne particulate matter (PM) contamination reported here reveal their role in plant chronic stress adaptation. Results of the pot experiment confirmed the toxic effect of trace elements present in PM for lettuce. PM applied to soil or on the lettuce leaves were associated with the strong inhibition of above-ground biomass and with the enhancement of plant trace element contents. The significant changes of amino acid levels and leaf gas-exchange parameters of the plants showed strong linear dependences on PM contamination (m>Rm>²=0.60-0.99). PM application on leaves intensified toxic effect of trace elements (As, Pb, Cr and Cd) originating from PM by shading of the leaf surface. The plant accumulation of nitrate nitrogen after PM contamination confirmed to block nitrate assimilation.