Submicroscopical Features of Leaves of Xyris Species

Brazilian Archives of Biology and Technology

Maria Das Graças Sajo²  Silvia Rodrigues Machado¹ 

[1] ,IBUNESP Departemento de Botânica Rio Claro SP ,Brazil

关键词: Xyris;    ultrastructure;    leaf;   

DOI  :  10.1590/S1516-89132001000400011

来源: SciELO

【 摘 要 】

The leaf ultrastructure of five Xyris species were examined using scanning electron microscope (SEM), transmission electron microscope (TEM) and histochemical methods. All studied leaves show some features in epidermis and mesophyll, which were of considerable adaptative significance to drought stress. Such features included the occurrence of a pectic layer on the stomatal guard cells and the presence of a network of pectic compounds in the cuticle. Pectic compunds were also in abundance in lamellated walls of the mesophyll cells and on the inner surface of the sclerified cell walls of the vascular bundle sheaths. There were also specialized chlorenchymatous "peg cells" in the mesophyll and drops of phenolic compounds inside the epidermal cells.

【 授权许可】

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