满江红结孢期间鱼腥藻侵染孢子果的新观察

New Data on the lnfection of the Developing Sporocarps with the Symbionts of Azolla during the Sporulation

用扫描电镜观察了小叶满江红、蕨状满江红和墨西哥满江红的内生藻对宿主孢子果的侵染及动向。发现有两种形态与大小不相同的鱼腥藻细胞链紧靠着孢子囊原基周围的表皮毛。大部分的藻丝借助于表皮毛，从发育中的孢子果顶端小孔进入孢子果。但藻丝从孢子果基部小孔入果的可能性也不能排除。正在发育的孢子果内外可见到仍在活跃分裂的鱼腥藻营养细胞。甚至在接近成熟的大孢子果的囊群盖内层细胞中偶尔也能见到营养细胞。尚未取得营养细胞在进入孢子果前即已分化为厚垣孢子的证据。

Scanning electron microscopy was used to follow the fate of Anabaena azollae in Azolla microphylla, A. filiculoides and A. mexicana, and mechanism by which the endophytic Anabaena were partitioned into developing sporocarp.Two kinds of algal hormogonia were found in close association with the trichomes around the base of the sporangial primordia. Most of Anabaena fila-ments entered the developing sporocarps through the pore of the tip in the indusia. But a possibility that the filaments passed through the pore of the base of the developing sporocarps could not pre-cluded as well. The actively dividing vegetative cells of the endophyte were observed inside the de-veloping sporocarps, none of the akinets of Anabaena, however could be seen outside the devel-oping sporocarps. Occasionally, some of the vegetative cells were engulfed in the inner layer cells of the indusium in the nearly matured megasporocarps.