Combined application of citric acid and 5-aminolevulinic acid improved biomass, photosynthesis and gas exchange attributes of sunflower (Helianthus annuus L.) grown on chromium contaminated soil
Combined application of citric acid and 5-aminolevulinic acid improved biomass, photosynthesis and gas exchange attributes of sunflower (Helianthus annuus L.) grown on chromium contaminated soil
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DOI：
10.1080/15226514.2018.1556595
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发表时间：
2019-07-03
影响因子：
3.7
通讯作者：
Ahmad, Irfan
中科院分区：
文献类型：
--
作者：
Farid, Mujahid;Ali, Shafaqat;Ahmad, Irfan
植物修复是去除污染土壤中重金属的一项重要技术，具有高效、经济的特点。研究了5-氨基乙酰丙酸(ALA)和柠檬酸(CA)在提高向日葵植物提取铬(Cr)方面的协同作用。向日葵植株在土壤中种植，添加不同浓度的铬(0、5、10、20 mg kg(-1))。不同浓度的5-ALA(0、10、20 mg L-1)和CA(0、2.5、5 mM)在幼鱼阶段外源施药。在单独铬胁迫下，向日葵的生物量和农艺性状均显著下降。此外，铬胁迫显著降低了植株的生长、可溶性蛋白质和光合色素含量。然而，外源ALA和CA通过减少活性氧的产生和减少电解质渗漏，显著改善了植物的生理和农艺性状。此外，随着土壤中铬浓度的增加，土壤对铬的吸收也增加，ALA和CA配施进一步提高了土壤对铬的吸收。
Phytoremediation is an important technique to remove heavy metals from contaminated soils due to its efficiency and cost-effectiveness. The present study was conducted to assess the synergistic role of 5-aminolevulinic acid (ALA) and citric acid (CA) in improving the phyto-extraction of chromium (Cr) by sunflower. Sunflower plants were grown in soil, spiked with different concentrations of Cr (0, 5, 10, 20mg kg(-1)). Various concentrations of 5-ALA (0, 10, 20mg L-1) and CA (0, 2.5, 5mM) were applied exogenously at juvenile stage. A significant decrease was observed in biomass and agronomic traits of sunflower under Cr stress alone. Further, Cr toxicity significantly decreased the plant growth, soluble proteins and photosynthetic pigments. However, exogenously applied ALA and CA significantly improved the plants' physiological as well as agronomic attributes by lowering the production of reactive oxygen species and reducing electrolyte leakage. Moreover, Cr uptake was increased with increasing concentration of Cr in spiked soil, which was further enhanced by combined application of ALA and CA.