Abstract

Fresh pollen grains of Alnus glutinosa were radiated with the same intensity of CuKα ray for four different lengths of time. The alterations in the exine ultrastructure and particularly in the biopolymer organization were investigated. The most important results are as follows: (1) The originally homogeneous substance of the ectexine layers are altered into finely granular one. (2) In particular on the surface, the degradation of the biopolymer system have been observed with several kinds of organization. (3) The original ultrastructural characteristic features of some exinous layers (e.g. lamellar endexine) disappear. (4) Endexine and the protoplasm may have the same secondary ultrastructure. (5) Peculiar effect to the bordering part of the different exinous layers have been observed with strong electron density. From these results it is concluded that X-ray has effected a heterogeneous character.

中文摘要

以相同的銅Kα射線強度但四種不同時間處理赤楊的新鮮花粉。其花粉壁的微細構造，特別是生物聚合物的構造產生改變。重要改點如下：(1)改變原均質性之外壁外層成為細粒狀。(2)在花粉表面，生物聚合物系統崩解成多種結構。(3)原本層狀的外壁內層微細構造消失。(4)外壁內層和原生質具有相同的次級構造。(5)不同的外壁層產生強電子強度。依據我們初步的結果，使用X-射線照射具有異質性的結果。