Hygroscopic Movement of Polytrichum commune Hedw.var.commune Peristome in Karst Plateau,Guizhou Province,China

doi:10.7525/j.issn.1673-5102.2021.03.017

Abstract

Abstract:

The investigation of the peristome of vapour-wind dispersal type mosses were found sensitive to humidity. The structure of peristome changed at different humidity， which played an important role in the release of spores. The Polytrichum commune Hedw.var.commune of Karst plateau， Guizhou Province was selected as the research object， and the difference of the structure of peristome and the release rule of spore under the change of humidity were observed. In order to reveal the influence and function of the hygroscopic movement on the spore release. The results showed that： ①When the humidity was increased， the sizes of peristome structure and epiphragm were increased significantly， then recovered when the humidity dried again. The space between peristome increased significantly from 8.33 to 11.53 μm， and the area of epiphragm was increased by 20%. ②In the experiment of continuous wind blowing， the quantity of spores released during the initial period of the hygroscopic movement was increased significantly， then decreased with the recovery of the peristome structure， and kept at a very low quantity at last. As the humidity was increased， the percentage of cluster spores in the released spores was increased， and increased with the decrease of the released spores， and reached significant difference when the peristome structure recovered. ③The wind experiments were carried out at the dry stage， the initial stage of the hygroscopic movement and the peristome structure in the recovery stage respectively， the quantity of spores released at the initial stage of the hygroscopic movement was significantly higher than that at the dry and re-recovery stages of the peristome structure， however， when the structure of peristome was restored， the released quantity of spores was still higher than that of dry spores due to the increase of the percentage of cluster spores. Thus， the structure of P.commune Hedw.var.commune peristome changed during the hygroscopic movement， and when the structure of peristome was restored， the ability of releasing spores was still higher than that of drying， with positive significance to the spread and reproduction of this species.

Key words: the hygroscopic movement, peristome, epiphragm, cluster spores, Polytrichaceae

CLC Number:

Q914.84

Zhe-Qi ZHANG, Zhi-Hui WANG, Zhao-Hui ZHANG. Hygroscopic Movement of Polytrichum commune Hedw.var.commune Peristome in Karst Plateau,Guizhou Province,China[J]. Bulletin of Botanical Research, 2021, 41(3): 458-465.

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