Comparison of Leaf Structure and Anatomical Characteristics of Four Man-grove Species
In order to compare the difference and adaptability of the leaf anatomical characteristics of mangrove plants under the same environment.The leaf structure and anatomical characteristics of Bruguiera sexangula,Rhi-zophora apiculate,B.gymnorhizza and Lumnitzera racemose by paraffin sectioning method.The results showed that the epidermis of the leaves of 4 mangrove species had similar structure.Thick cuticle were commonly existed in the upper and lower epidermis,columnar or short columnar cells existed in the palisade tissue,and the spongy tis-sue arranged loosely.However,the difference between the quantitative characteristics of leaf structure with man-grove species.The palisade/spongy tissue ratio was the highest(0.60),and the leaf compactness and porosity were the highest in Bruguiera gymnorhiza and Lumnitzera racemose,respectively.The xylems in the leaves of Bruguiera gymnorhiza,B.sexangula and Rhizophora apiculate were identified to be well developed,but the xylem vessels of Lumnitzera racemose was not.The results of PCA showed that the adaptability of mangroves was related to the palisade tissue,upper epidermis,lower cuticle and leaf porosity,they were differences among the four mangrove species in environmental adaptability factors.To sum up,the leaf structural characteristics of the four mangrove species all have special anatomical characteristics to adapt to the salt environment in the same habitat.These char-acteristics could also be used as a taxonomy basis and it is of great significance to identify the tidal saliniferous plants and to analyze the formation environment of their sediments.
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