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首页> 美国卫生研究院文献>other >Germination Physiological Responses and Gene Expression of Tall Fescue (Festuca arundinacea Schreb.) Growing under Pb and Cd
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Germination Physiological Responses and Gene Expression of Tall Fescue (Festuca arundinacea Schreb.) Growing under Pb and Cd

机译：在铅和镉下生长的高羊茅（Festuca arundinacea Schreb。）的萌发生理响应和基因表达

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Cadmium (Cd) and lead (Pb) are recognized as the most toxic metal ions due to their detrimental effects not only to plants, but also to humans. The objective of this study was to investigate the effects of Cd and Pb treatments on seed germination, plant growth, and physiological response in tall fescue (Festuca arundinacea Schreb.). We employed six treatments: CK (nutrient solution as control), T1 (1000 mg L-1 Pb), T2 (50 mg L-1 Cd), T3 (150 mg L-1 Cd), T4 (1000 mg L-1 Pb+50 mg L-1 Cd), T5 (1000 mg L-1 Pb+150 mg L-1 Cd). Antagonistic and synergistic actions were observed in tall fescue under Pb and Cd combined treatments. Under low Cd, plants exhibited higher relative germination rate, germ length, VSGR, catalase (CAT) and peroxidase (POD) activities. Additionally, in the shoots, the gene expression level of Cu/Zn SOD, FeSOD, POD, GPX, translocation factors, MDA, EL, and soluble protein contents were reduced under Pb stress. Conversely, under high Cd level, there was a decline in NRT, Pb content in shoots, Pb translocation factors, CAT activity; and an increase in VSGR, Pb content in roots, gene expression level of Cu/ZnSOD and POD in tall fescue exposed to Pb2+ regimes. On the other hand, tall fescue plants treated with low Cd exhibited lower relative germination rate, germination index, germ length, NRT, Cd content in roots. On the other hand there was higher Cd content, Cd translocation factor, CAT and POD activities, and gene expression level of Cu/Zn SOD, FeSOD, POD, GPX under Pb treatment compared with single Cd2+ treatment in the shoots. However, after high Cd exposure, plants displayed lower NRT, Cd content, CAT activity, and exhibited higher Cd contents, Cd translocation factor, MDA content, gene expression level of Cu/ZnSOD and GPX with the presence of Pb2+ relative to single Cd2+ treatment. These findings lead to a conclusion that the presence of low Cd level impacted positively towards tall fescue growth under Pb stress, while high level of Cd impacted negatively. In summary, antioxidant enzymes responded to Cd and Pb interaction at an early stage of exposure, and their gene expression profiles provided more details of the activation of those systems.
机译：镉（Cd）和铅（Pb）被认为是最有毒的金属离子，因为它们不仅对植物而且对人类都有有害作用。这项研究的目的是研究镉和铅处理对高羊茅种子的发芽，植物生长和生理响应的影响。我们采用了六种处理方法：CK（营养液作为对照），T1（1000 mg L -1 Pb），T2（50 mg L -1 Cd），T3（150毫克L -1 Cd），T4（1000毫克L -1 Pb + 50毫克L -1 Cd），T5（1000毫克L -1 Pb + 150 mg L -1 Cd）。在铅和镉联合处理下高羊茅中观察到拮抗和协同作用。在低镉下，植物表现出较高的相对发芽率，胚芽长度，VSGR，过氧化氢酶（CAT）和过氧化物酶（POD）活性。此外，在铅胁迫下，芽中Cu / Zn SOD，FeSOD，POD，GPX，转运因子，MDA，EL和可溶性蛋白质含量的基因表达水平降低。相反，在高Cd水平下，NRT，枝条中Pb含量，Pb易位因子，CAT活性均下降。 Pb 2 + 处理的高羊茅根中VSGR，根中Pb含量，Cu / ZnSOD和POD基因表达水平增加。另一方面，用低Cd处理的高羊茅植株的根部相对发芽率，发芽指数，胚芽长度，NRT，Cd含量较低。另一方面，与单一Cd 2 + 相比，铅处理后的Cu / Zn SOD，FeSOD，POD，GPX的Cd含量，Cd转运因子，CAT和POD活性以及基因表达水平更高。芽中的治疗。然而，在高镉暴露后，在Pb 2+存在下，植物表现出较低的NRT，Cd含量，CAT活性，并表现出较高的Cd含量，Cd易位因子，MDA含量，Cu / ZnSOD和GPX的基因表达水平。 相对于单个Cd 2 + 处理。这些发现得出一个结论，即低铅水平的存在对铅胁迫下高羊茅生长具有积极影响，而高镉水平则对不利的羊茅生长产生积极影响。总之，抗氧化酶在暴露的早期对Cd和Pb的相互作用有反应，它们的基因表达谱提供了这些系统激活的更多细节。

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