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| Comparative anatomy of stems of 12 species of saxicolous mosses in Guizhou karst rock desertification areas |
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| Abstract: |
| Through paraffin wax section, the comparative morphological anatomy of 12 saxicolous mosses stems in different environments of karst rock desertification areas were studied. The results showed that, the stems of 12 saxicolous
mosses were different on stem shape, epidermis, existence or inexistence and the scale of the mainaxis of stems varied
highly. The tightly arrayed epidermis in their stem, the distinctly thickened cellwalls in epidermis were found in xeric
saxicolous mosses, the majority had one cell-layer. More types were outward protruding extension and formed cells glands.
Besides Bryum knowltonii internal and external cortex of other 11 kinds of mosses had differentiation between inner and
outer cortex and cell wall thickening of the epidermis. The B. argenteum and Atrichum undulatum had the mainaxis of
differentiation, the differentiation of the remaining 8 species of saxicolous mosses was not very obvious. However, the
mainaxis of Weisin semipallida C. Muell. and Erythrodontium julaceum were not differentiation, which indicated that water
uptake and conduction of saxicolous mosses in karst areas was the ectohydric based and mixohydric supplemented.
Therefore, the anatomical structure of saxicolous mosses stems in the xerophytic environment has important ecological
significance of adaptation. |
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