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首页> 外文期刊>Journal of Experimental Marine Biology and Ecology >Effect of nitrate enrichment and salinity reduction on the seagrass Thalassia hemprichii previously grown in low light
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Effect of nitrate enrichment and salinity reduction on the seagrass Thalassia hemprichii previously grown in low light

机译：硝酸盐富集和盐度降低对先前在弱光下生长的海草Thalasia hemprichii的影响

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摘要

A sub-acute experiment that tested carbon and nitrogen metabolisms and the plant's antioxidant defence system was used to investigate the effects of nitrate enrichment and salinity reduction on the tropical seagrass Thalassia hemprichii that had previously been grown in low light conditions. Shading significantly reduced leaf growth rate, nitrate reductase activity and non-structural carbohydrate (NSC) content in both aboveground and below-ground tissues, but enhanced superoxide dismutase and guaiacol peroxidase (POD) activities and free amino acids in aboveground tissue. After shade removal, salinity reduction with pre-shading decreased minimum fluorescence and maximum fluorescence under all nitrate conditions. Pre-shading aggravated the negative effect of nitrate enrichment and salinity reduction on leaf growth rate. Nitrate enrichment led to a greater reduction in NSC in aboveground tissues of pre-shading plants compared to the control. Furthermore, salinity reduction with pre-shading even induced effective NSC translocation from belowground to aboveground tissues. Nitrate enrichment and salinity reduction both increased POD activity in T. hemprichii grown previously in low light. Therefore, pre-shading increases the vulnerability of T. hemprichii to eutrophication and hyposalinity, which must be considered when predicting future responses and effective management of seagrass resources.
机译：使用亚急性实验测试了碳和氮的代谢以及植物的抗氧化剂防御系统，以研究硝酸盐富集和盐度降低对先前在弱光条件下生长的热带海草Thalasia hemprichii的影响。遮光显着降低了地上和地下组织的叶片生长速率，硝酸盐还原酶活性和非结构性碳水化合物（NSC）含量，但增强了地上组织的超氧化物歧化酶和愈创木酚过氧化物酶（POD）活性以及游离氨基酸。去除阴影后，在所有硝酸盐条件下，通过预阴影降低盐度会降低最小荧光和最大荧光。遮荫加剧了硝酸盐富集和盐度降低对叶片生长速率的负面影响。与对照相比，硝酸盐富集导致预遮光植物地上组织中NSC的降低更大。此外，通过预先遮蔽降低盐度甚至可以诱导有效的NSC从地下组织转移到地面组织。硝酸盐富集和盐度降低都增加了先前在弱光条件下生长的T. hemprichii的POD活性。因此，预先遮荫增加了汉氏锥虫对富营养化和次盐度的脆弱性，这在预测未来对海草资源的反应和有效管理时必须加以考虑。

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    Zhijian Jiang; Xiaoping Huang; Jingping Zhang;

  • 作者单位

    State Key Laboratory of Tropical Oceanography, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, PR China,Tropical Marine Biological Research Station in Hainan, Chinese Academy of Sciences, Sanya 572200, PR China;

    State Key Laboratory of Tropical Oceanography, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, PR China;

    State Key Laboratory of Tropical Oceanography, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, PR China,Tropical Marine Biological Research Station in Hainan, Chinese Academy of Sciences, Sanya 572200, PR China;

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  • 正文语种 eng
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  • 关键词

    Enzymatic activity; Growth; Nitrate enrichment; Salinity reduction; Seagrass; Thalassia hemprichii;

    机译：酶活性;成长;硝酸盐富集;盐度降低;海草;鱼;

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