Insight into nitrogen and phosphorus enrichment on cadmium phytoextraction of hydroponically grown Salix matsudana Koidz cuttings
Insight into nitrogen and phosphorus enrichment on cadmium phytoextraction of hydroponically grown Salix matsudana Koidz cuttings
复制标题
水培柳插条植物提取镉的氮磷富集研究
DOI：
10.1007/s11356-019-07499-4
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发表时间：
2020-03-01
影响因子：
5.8
通讯作者：
Tian, Xingjun
中科院分区：
文献类型：
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作者：
Kong, Xiangshi;Zhao, Yunxia;Tian, Xingjun
镉（Cd）因其对人类和植物的高生物毒性已引起全世界的关注。研究了氮（N）和磷（P）的富集对水培旱柳（Salix matsudana Koidz）插穗中Cd的毒性、形态和积累的影响。结果表明，Cd胁迫显著抑制了S.结果表明，松竹扦插苗地上部和根系生物量减少，光合色素含量降低，可溶性蛋白质和过氧化物酶活性增加。N、P处理可通过增加脯氨酸的产生减轻Cd的毒害作用，从而降低丙二醛的含量，促进Cd的累积。N和P的富集显著降低了Cd的向上转移，同时增强了根系吸收（刺激根系活力）和从茎中的再转运，导致S.松根在根和木质部中，Cd浓度与N和P正相关。N和P富集提高植物提取潜力主要是通过提高根中Cd浓度，可能是通过增加植物螯合素的产生（例如，脯氨酸），其形成Cd螯合物并帮助防止Cd诱导的ROS的损害。本研究为S.即使在富营养化的水环境中，松竹也能有效地提取镉。
Cadmium (Cd) has already caused worldwide concern because of its high biotoxicity to human and plants. This study investigated how nitrogen (N) and phosphorus (P) enrichment alter the toxic morpho-physiological impacts of and accumulation of Cd in hydroponically grown Salix matsudana Koidz cuttings. Our results showed that Cd significantly depressed growth and induced a physiological response on S. matsudana cuttings, exhibiting by reduced biomass, decreased photosynthetic pigment concentrations, and increased soluble protein and peroxidase activity of shoots and roots. N and P enrichment alleviated the Cd toxic effects by increasing production of proline which prevented cuttings from damage by Cd-induced ROS, displaying with decreased malondialdehyde concentration, and stimulated overall Cd accumulation. Enrichment of N and P significantly decreased the upward Cd transfer, combing with enhanced root uptake (stimulated root activity) and retranslocation from stem, resulted in extensive Cd sequestration in S. matsudana roots. In both root and xylem, concentration of Cd is positively correlated with N and P. The improved phytoextraction potential by N and P enrichment was mainly via elevating Cd concentration in roots, probably by increased production of phytochelatins (e.g., proline) which form Cd chelates and help preventing damage from Cd-induced ROS. This study provides support for the application of S. matsudana in Cd phytoextraction even in eutrophic aquatic environments.