摘要
核心薄囊蕨类是真蕨纲中的主要类群,其颈卵器壁细胞的起源问题尚未见报道。该研究以华北鳞毛蕨为例,在人工培养条件下,用石蜡切片法综合观察了颈卵器的发育过程,分析颈沟细胞、腹沟细胞、卵细胞等的发生与分化,并结合桫椤科等十多个类群性器官的研究成果,探讨核心薄囊蕨类颈卵器的起源。结果表明:(1)颈卵器由配子体1个原始细胞和多个营养细胞共同发育而成。(2)原始细胞经两次不均等分裂由外向内依次形成颈壁细胞、中央细胞、基细胞。(3)中央细胞分裂形成1个卵细胞、1个腹沟细胞和颈沟细胞。(4)基细胞分化为颈卵器腹壁最下方的1~4个壁细胞。(5)颈卵器腹部周围的壁细胞由卵细胞周围的多个营养细胞直接转化而来。该研究首次提出了核心薄囊蕨类颈卵器为多细胞起源,并为探讨颈卵器植物的有性生殖演化规律提供了形态学依据。
Core leptosporangiatae is a major fern group in the Filicinae.The origin of the wall cell on archegonium has not been specifically reported yet.Combined with research on sexual organs of Cyatheaceae and other 10 more groups,this paper takes Dryopteris goeringiana（Kunze）Koidz.as an example,at the condition of artificial environment,observed the development of the archegonium by paraffin section method.The results show that：（1）the archegonium originates from an initial cell and a plurality of vegetative cells on the gametophyte;（2）Initial cell gives rise to a column of three cells by two unequal divisions,from outside to inside,there are neck wall cell,central cell and basal cell;（3）Central cell ultimately developed into an egg cell,ventral canal cell and neck canal cell;（4）Basal cell divided into 1-4 wall cells under the ventral wall of the archegonium;（5）The wall cells around the ventral of the archegonium are directly transformed from the vegetative cells adjacent to the egg cell.It is the first time to propose that the archegonium of the core leptosporangiatae is multicellular origin,the morphological basis is provided for the study of the evolution of sexual reproduction in the archegonium plants.
出处
《西北植物学报》
CAS
CSCD
北大核心
2018年第1期55-60,共6页
Acta Botanica Boreali-Occidentalia Sinica
基金
国家自然科学基金(31770350)
关键词
核心薄囊蕨类
颈卵器
多细胞起源
core leptosporangiates
archegonium
multicellular origin
