Abstract:

In order to explore the response of the stem and leaf microstructure of Parashorea chinensis to enviornment conditions, using paraffin method, the stem and leaf microstructure of P. chinensis were observed by using optical microscope. The results showed that the surface of stem and leaf were densely covered with epidermal hairs, meanwhile the conducting tissue and mechanical tissue were well developed. The leaves of P. chinensis were typical bifacial leaf and composed of epidermis, mesophyll and vascular bundles. There were cuticle existed both on upper and lower epidermis. The stoma only scattered on the lower epidermis and stomatal apparatuses were paracytic type. There were particular structure in main vein that 3-5 amphivasal vascular bundles distributed in nearly closed collateral vascular bundle. The structure of stem was similar to other dicotyledon plants and composed of epidermis, cortex, vascular bundle, pith and pith ray. Periderm was formed in secondary structure. The secretory canals mainly located in the interval among the vascular bundles of leaf main vein and pith of stem, but the secretory cells were commonly exist in the parenchymatous cells. The anatomical characteristics of P. chinensis represented the adaptability with its taller sharpe and drought environment.