油松树脂道的发生和发育研究

关于松科植物的树脂道,以往都认为是以裂生方式发生。本文通过对油松各类器官的发育解剖学研究,发现其各类器官中树脂道的结构,发生和发育方式并不完全一致,并对产生这些差异的原因进行了分析和讨论。

THE INITIATION AND DEVELOPMENT OF RESIN DUCTS IN PINUS TABULAEFORMIS CARR.

The structure and pattern of initiation and development of resin ducts in Plans tabulaeformis Carr. have be(?)n studied. It is found that the resin duets are formed sehizogenously, in all o(?)gans, except ovule, just as in other species of gymnospermus, but in ovule the resin duets are formed by lysis of some nucellar cells, pattern of initiation is sialiliar to that in most of angiospermus.The primary resin ducts in the root, stem, leave and the secondary resin ducts in the ray, resin duct initials form rosette, in the secondary root and stem, no rosette is formed.The structure of resin duets of the different organs is different. In the resin ducts of stem cortex, root and stem ray. scale, macrosporophyll and microsporophyll, sheath cells are living, whereas in those of the xylem of root, stem and needle, the sheath cells are dead ones with suherin wall. In addition, resin duets formed schizogenously are elogated structure, while resin ducts formed lysigenously are cyst-like structure.Tylosoid occurs at the later phase of resin ducts development in the heart-wood of stem, vascular strand of needle and scale, but they do not app- (?)ar in other organs.In this paper, difference of structure, initiation and development of resin ducts are analysed and discussed.