极危孑遗蕨类中华水韭有性生殖的形态学研究
作者:
作者单位:

作者简介:

通讯作者:

中图分类号:

基金项目:

国家自然科学基金(31170294)


Morphological Study on the Sexual Reproductive of the Critically Endangered Fern Isoetes sinensis
Author:
Affiliation:

Fund Project:

  • 摘要
  • |
  • 图/表
  • |
  • 访问统计
  • |
  • 参考文献
  • |
  • 相似文献
  • |
  • 引证文献
  • |
  • 资源附件
  • |
  • 文章评论
    摘要:

    通过人工培养,采用半薄切片和超薄切片法,对中华水韭(Isoetes sinensis Palmer)有性生殖全过程进行了连续观察。结果显示:(1)雌雄配子体均为壁内发育,雌配子着生有假根,发育出多个颈卵器;雄配子体无假根,每个雄配子可产生4个具有8~12条鞭毛的精细胞。(2)颈卵器只有2个颈沟细胞和1个卵细胞,腹壁细胞由配子体营养细胞转化而来。(3)合子初次分裂面与颈卵器长轴之间的夹角约为20°,2~4细胞胚胎易于停止分裂而老化,自数十个细胞后胚胎即出现明显的组织分化。(4)在球形胚时期第一叶还没分化的时候,在胚胎中出现第一叶的叶舌原始细胞,但直到第一叶顶端变绿具有光合能力时,第一叶的叶舌才开始发育。研究结果支持根叶优先发育的观点,认为雄配子体发生率极低、雌配子体存在较多的败育性结构等,是中华水韭生殖濒危的主要原因。

    Abstract:

    By artificial culture,with semithin section and ultrathin section,we continuously observed the whole procedure of sexual reproduction of Isoetes sinensis Palmer.The results showed:(1)both female and male gametophytes are intramural development,there are rhizoids and archegoniums on femal gametophyte;but no rhizoids for male gametophyte,and every male gametophyte have 4 spermatids,all of them have 8-12 flagellums.(2)There are only two neck canal cells and one egg in the archegonium,and the ventral wall cells were transformed from the gametophyte vegetative cells.(3)Between the first division of the zygote and the achegonium’s long axis,there is an angle about 20°,and the embryo with 2-4 cells is easy to division and be aging,organization differentiation obvious on the embryo after 10 cells.(4)When is the globular embryo’s time,the first leaf has not differentiation and ligule primitive cell appeared in the embryo.The first leaf ligule will not development until the first leaf’s upside change to green and get photosynthetic capacity.The results supported the view of the priority development of root and leaf,and we think the main reasons of the I.sinensis endangered are about the male gametophyte’s lower germination rate and the female gametophyte exist more abortive structures.

    参考文献
    相似文献
    引证文献
引用本文

刘子玥,邢建娇,路 靖,等.极危孑遗蕨类中华水韭有性生殖的形态学研究[J].西北植物学报,2015,35(5):922-928

复制
分享
文章指标
  • 点击次数:
  • 下载次数:
  • HTML阅读次数:
  • 引用次数:
历史
  • 收稿日期:
  • 最后修改日期:
  • 录用日期:
  • 在线发布日期: 2015-06-09
  • 出版日期:

微信公众号二维码

手机版网站二维码