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Bulletin of Botanical Research ›› 2020, Vol. 40 ›› Issue (4): 481-489.doi: 10.7525/j.issn.1673-5102.2020.04.001

• Research Report •     Next Articles

Peristome Submicro Structure of Hypopterygium in Karst Tiankeng

WU Jin1, ZHANG Zhao-Hui1, WANG Zhi-Hui2   

  1. 1. Key Laboratory for Information System of Mountainous Area and Protection of Ecological Environment of Guizhou Province, Guizhou Normal University, Guiyang 550001;
    2. School of Life Sciences, Guizhou Normal University, Guiyang 550001
  • Received:2019-11-19 Online:2020-07-05 Published:2020-06-12
  • Supported by:
    National Natural Science Foundation(31760050,31960044,31760043);DSTFGC([2017]5726)

Abstract: The microenvironment of Karst Tiankeng has a significant effect on the characteristicsof plant structure.In order to provide reference for the structural adaptation of the peristome of moss in the microenvironment, the submicrostructure of the peristome of the Hypopterygium in the karst Tiankeng was studied by scanning electron microscope (SEM).From the submicroscopic morphology of peristome, two species of Hypopterygium, named H.flavo-limbatum C.Muell and H.japonicum Mitt, have obvious differences in the shapeof their dentium, tropism of dentium, dorsal ridges of the exstomium, ventral lateral stripes of the processus and whether they have ganglioma or not.It belongs to the characteristic of stability and can be used as the basis of system classification. On the other hand, the length and width of dentium, number of plates, transverse raphe and middle raphe are variable characteristics, which should be screened when the peristome of mosses are used as the basis of systematic classification.Illuminance, air temperature, air humidity and altitude are the main environmental factors affecting the development and growth of peristome morphological and structural of H.flavo-limbatum in Tiankeng. Air humidity, illuminance and artificial interference are the main environmental factors affecting the development and growth of peristome morphological and structural of H.japonicum in Tiankeng. Both of the peristome structures of two species of Hypopterygium are most affected by humidity, andtheir habitats are mostly humid and rich in soil moisture.

Key words: Karst Tiankeng, Hypopterygium, peristome, submicroscopic structure

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