镉胁迫对构树氮分配以及光合作用的影响
Effects of Cadmium Stress on Nitrogen Allocation and Photosynthesis in Broussonetia papyrifera
摘要: 目前关于植物修复重金属的研究有很多，但是探究构树在镉胁迫下如何分配土壤氮素的研究鲜有报道。为了研究镉胁迫对构树氮素分布以及光合作用的影响，本实验将从种子萌发的构树开始培养，对构树进行镉处理后，比较构树间的光合作用差异，以及构树可溶性蛋白和细胞膜蛋白含量的变化，探究构树在镉胁迫下对氮素的分配，为构树生态修复镉胁迫奠定基础。实验发现，镉胁迫增加了氮素在叶片中的可溶性蛋白以及根系中的细胞膜蛋白的分配，部分叶绿素荧光参数(Fv/Fm、qP、Fm)也有相应的变化。构树增加了用于细胞代谢以及光合作用的氮量，进而维持构树正常进行光合作用，促进构树在镉胁迫下正常生长。这为探究构树生态修复镉胁迫的机制奠定了基础。
Abstract: Numerous studies have focused on phytoremediation of heavy metals, but research investigating nitrogen allocation in Broussonetia papyrifera under cadmium (Cd) stress remains limited. To explore the effects of Cd stress on nitrogen distribution and related photosynthesis in B. papyrifera, this study started from the seed germination of B. papyrifera, subjected the plant to cadmium treatment, analyzed the difference of photosynthesis of B. papyrifera, as well as the changes of the content of soluble protein and cell membrane protein, and investigated the distribution of nitrogen allocation in B. papyrifera under Cd stress, laying the foundation for ecological remediation of B. papyrifera under Cd stress. It was found that Cd stress increased nitrogen allocation to soluble proteins in leaves and cell membrane proteins in roots. However, certain chlorophyll fluorescence parameters (Fv/Fm, qP, Fm) were changed accordingly. B. papyrifera enhances nitrogen allocation to cellular metabolism and photosynthetic processes, thereby maintaining normal photosynthesis and promoting the normal growth of B. papyrifera under Cd stress. This study provides foundational insights into the mechanisms by which B. papyrifera mitigates Cd stress through ecological remediation.
文章引用：柯彤, 钱志良, 胡文涛. 镉胁迫对构树氮分配以及光合作用的影响[J]. 植物学研究, 2025, 14(3): 200-207. https://doi.org/10.12677/br.2025.143023

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