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辛桂亮, 郑俊鸣, 叶志勇, 张万超, 邓传远. 秋茄次生木质部的生态解剖学研究[J]. 植物科学学报, 2015, 33(6): 792-800. DOI: 10.11913/PSJ.2095-0837.2015.60792
引用本文: 辛桂亮, 郑俊鸣, 叶志勇, 张万超, 邓传远. 秋茄次生木质部的生态解剖学研究[J]. 植物科学学报, 2015, 33(6): 792-800. DOI: 10.11913/PSJ.2095-0837.2015.60792
XIN Gui-Liang, ZHENG Jun-Ming, YE Zhi-Yong, ZHANG Wan-Chao, DENG Chuan-Yuan. Ecological Anatomical Characteristics of Secondary Xylem in Kandelia obovata Sheue et al.[J]. Plant Science Journal, 2015, 33(6): 792-800. DOI: 10.11913/PSJ.2095-0837.2015.60792
Citation: XIN Gui-Liang, ZHENG Jun-Ming, YE Zhi-Yong, ZHANG Wan-Chao, DENG Chuan-Yuan. Ecological Anatomical Characteristics of Secondary Xylem in Kandelia obovata Sheue et al.[J]. Plant Science Journal, 2015, 33(6): 792-800. DOI: 10.11913/PSJ.2095-0837.2015.60792

秋茄次生木质部的生态解剖学研究

Ecological Anatomical Characteristics of Secondary Xylem in Kandelia obovata Sheue et al.

  • 摘要: 为了探讨秋茄(Kandelia obovata Sheue et al.)次生木质部的形态解剖和数量解剖特征变化对不同红树林生境的生态适应意义,采用光学显微镜(LM)、扫描电镜(SEM)、透射电镜(TEM)和激光共聚焦显微镜(LSCM)对深圳福田红树林自然保护区内7个秋茄种群的次生木质部解剖特征进行观测,并对种群样地的土壤盐分含量、pH值和土壤养分含量进行测定。结果显示,(1) 7个秋茄种群的次生木质部具有一些共同形态解剖特征:具纤维状导管和环管管胞;许多导管壁的微观结构(如管壁附物、穿孔板附物和螺旋雕纹等)有利于提高水分输导的高效性和安全性,以适应潮间带生境;(2) 应用逐步回归分析法对秋茄次生木质部数量解剖特征和土壤理化因子的关系进行分析发现,随着土壤Na + 、土壤全盐量增高,秋茄次生木质部导管分子趋向于“大型化”。“大型化”导管有利于水分输导,但降低了安全性。在土壤盐离子含量越高、秋茄导管分子越大其水分输导安全性越低的情况下,推测可能有其它机制保证秋茄导管水分输导的安全性。

     

    Abstract: Five soil physicochemical indexes, including edaphic pH, edaphic salinity and soil nutrient values, were determined in seven Kandelia obovata populations located in the Futian Mangrove Nature Reserve of Shenzhen Bay. The morphological features of the secondary xylem of K. obovata populations corresponding to soil sampling, which represented different habitats, were surveyed by light microscopy (LM), scanning electron microscopy (SEM), laser scanning confocal microscopy (LSCM) and transmission electron microscopy (TEM). Variations in the quantitative wood anatomical features of the seven K. obovata populations were assessed in detail. Relationships between soil physicochemical variables and quantitative wood anatomical features were analyzed statistically. Some specialized wood structures in K. obovata growing in different habitats were observed, suggesting that they function to safely conduct water under high negative pressure and are adaptive to intertidal habitats. Their characteristics included some fibriform vessel elements and a few vasicentric tracheids; abundant micromorphological structures such as vestures and helical structures on vessel walls, and vestured pits and perforated plates. The relationship between soil physicochemical factors and quantitative anatomical features by stepwise regression analysis indicated that larger-scale vessel elements occurred with increasing soil Na + content and total salt quantity. Large scale vessel elements improved the water transportation efficiency, but depressed water transportation safety. Presumably, other wood anatomical features might ensure safe mechanisms for K. obovata under conditions of higher soil ion content and larger scale vessel elements, which both result in lower water transportation safety.

     

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