蜈蚣藻和繁枝蜈蚣藻孢子发生类型的研究

A COMPARATIVE STUDY ON THE MODE OF SPOROGENSIS OF CRATELOUPIA FILICINA C.AG.AND GRATELOUPIA RAMOSISSIMA OKAM

本研究以我国厦门地区沿海产的蜈蚣藻和繁枝蜈蚣藻为对象,进行其发生的比较研究,其结果如下: l.蜈蚣藻的果孢子和四分孢子大小相似,直径约为15微米左右,孢子中央具有一个细胞核,色素体多集中于细胞中央,呈黄褐色。繁枝蜈蚣藻的果孢子和四分孢子略大,直径为17微米左右,其色素体呈棕褐色。 2.蜈蚣藻和繁枝蜈蚣藻的孢子发生类型,均为间接盘状型,但其发生初期的发生形式,略有不同,表现出种间的差异性。

The comparative study of the mode of sporogenesis in algae is ofmuch importance for both identifying their taxonmic position and for finding outthe relationship of genealogical germination between them. The materials used in this study were Gratelopia filicina and G. ramosissimacollected from the seashore of Xiamen in the Dong Hai Sea. The results obtained fromthe comparative observation on their sporogsis were as follows: 1) The size of both tetraspores and carpospores of Grateloupia filicina weresimilar to each other, liberated spore about 15μm in diameter, all spherical. Therewas a nucleus in the centher of the spore. Most of chromoplasts gathered in the centerof cell were yellow-brown in colour. Both carpospores and tetraspores of G. ramosis-sima were about 17μm slightly bigger than that of G. filicina, and their chromoplastsshowed dark-brown in colour.2) According to our observation, the modes of sporogenesis of both G. filicinaand G. ramosissima were all 'mediate discal type'. However, the germinal form oftheir initial stage had a bit of differance which may be considered as the difference ofspecies.