国产阔叶树材导管中侵填体和树胶的研究

A STUDY ON TYLOSES AND GUMS IN THE VESSELS OF CHINESE HARDWOOD

扫描电镜观察我国１０２种阔叶树材导管，其中４９种有侵填体存在，１２种有树胶存在．侵填体形态有４种类型，即泡沫状、梯状、坍塌状和圆球状。树胶分布有３种形式，即堵塞整个导管、胶层附在导管内壁、圆球状胶滴沉积在纹孔上。导管－射线间纹孔口长和宽大于３μｍ和２μｍ的树种具有侵填体，小于３μｍ和２μｍ的具有树胶。对刺槐（Ｒｏｂｉｎｉａｐｓｅｕｄｏａｃａｃｉａ）超薄切片的观察表明，侵填体壁具有分层的初生壁和胞间层，并保留单纹孔。光镜观察３种阔叶树材导管中侵填体和树胶在生长轮的分布，近髓心处含量最丰富，向树皮方向有减少的趋势。

The occurrence and morphology of tyloses and gums in vessels of 102Chinese hardwood were investigated using SEM.Tyloses were present in 49species and gums in 12 species.Morphological types of tyloses are:foamed,ladder-,collasped-shaped,globular.Morphological types of gums are:vesselsocclusied,thin layer,small droplet.The mean values of length and widthpit aperture of vessel to parenchyma pit were greater than 3 and 2μm,respectively,in species having tyloses and were less than these values in species having gums.The obeservation of ultrathin section of Robinia pseudoacacia wood by TEM showed:the tyloses walls has a compound middle lamellaand primacy walls with simple pits.There are more tyloses and gums invessele of pith of 3 species.The content of tyloses and gums decreased invessels of each growth ring from pith to bark.