小扭口藓(Barbula indica)芽胞发育特征的实验研究

Experimental studies on the characteristics of gemma development in Barbula indica

在光照培养箱中人工对照培养小扭口藓(Barbula indica(Hook.)Spreng)的芽胞,显微镜下观察并记录其发育成配子体的全过程.结果表明:小扭口藓芽胞在3～4d即可萌发;10 d左右开始分化出绿丝体、轴丝体及假根;18 d,轴丝体上的侧枝顶端细胞以分生缢割的方式产生单细胞或多细胞芽胞;40 d,轴丝体上开始出现配子体原始细胞;之后,配子体原始细胞发育成桑椹状的幼小配子体.还对芽胞形态发育、生理生态及配子体发生过程的特点进行了分析和讨论.

Gemma culture and protonema growth of Barbula indica (Hook.) Spreng in response to meliorative knop, authors study the whole process and take photoes. The results show that its gemma germinates after 3~4 days;10 days later, chloronemata, caulonemata and rhizoides begin to differentiate; 18 days, the branch top cells of caulonemata differentiate into unicellular or multicellular gemmas; Nearly 40 days, bud primordium appears on caulonemata and develops into callow gametophyte. In the end of this paper, the characteristics of gemma development, and phyoiological ecology and gametophyte formation are analysed and discussed.