新的,一个没有的晚代纪卵子,以及它对整体功能的影响
1Key Laboratory of Orogenic Belts and Crustal Evolution, Department of Geology, Peking University, Beijing, China.
Plant biology (Stuttgart, Germany)
|March 20, 2025
概括
来自德纪晚期的化石卵子揭示了Sinolobotheca octa,这是一个缺乏cupules的新属. 它独特的,平坦的整体叶片表明了超出保护范围的新功能,如光合作用和营养储存.
科学领域:
- 古植物学是古植物学.
- 进化生物学 进化生物学
- 植物形态学植物形态学
背景情况:
- 最早的种子植物卵子从晚代纪 (Famennian) 往往是分离和拥有cupules.
- 这些早期卵子的确切功能仍未得到充分研究.
研究的目的:
- 研究早期种子植物卵子的形态学和进化意义.
- 描述Famennian ovule的一个新分类,并推断出它的生态功能.
主要方法:
- 在野外工作期间采集化石植物.
- 使用钢针制备样本.
- 显微镜检查许多卵子的横截面.
主要成果:
- 一个新的属和物种,Sinolobotheca octa gen. et sp. Nov. 从中国的Famennian中鉴定出来.
- Sinolobotheca的卵子缺乏,结束二分法分支,并具有八个独特的,近距离融合的,远距离融合的,横向分离的整体叶片.
- 这些叶片是长长的,平的,向外曲的,含有丰富的薄壁细胞,在很大程度上与核细胞无关.
结论:
- 发现Sinolobotheca支持这样一个假设:一些Famennian卵子中可能会丢失cupula.
- 体的复杂性和重要性增加,包括平坦化和体,表明它们在光合作用和营养/水储存中具有进化的功能.
- 在Sinolobotheca中没有差异化的核细胞尖端,这可能表明它不依赖早期种子植物特有的水精子繁殖.
更多相关视频
07:32Protocols for Obtaining Zygotic and Somatic Embryos for Studying the Regulation of Early Embryo Development in the Model Legume Medicago truncatula
Published on: June 9, 2015
13.9K
10:57Scanning Electron Microscopy SEM Protocols for Problematic Plant, Oomycete, and Fungal Samples
Published on: February 3, 2017
28.7K
相关概念视频
02:33Seed Structure and Early Development of the Sporophyte
27.6K
Seed structures are composed of a protective seed coat surrounding a plant embryo, and a food store for the developing embryo. The embryo contains the precursor tissues for leaves, stem, and roots. The endosperm and cotyledons—seed leaves—act as the food reserves for the growing embryo.
27.6K
02:26Non-vascular Seedless Plants
63.1K
The diverse plant life on Earth—consisting of nearly 400,000 species—can be divided into three broad categories based on biological characteristics: nonvascular, seedless vascular, and seed plants.
63.1K
03:40Introduction to Seed Plants
60.0K
Most plants are seed plants—characterized by seeds, pollen, and reduced gametophytes. Seed plants include gymnosperms and angiosperms.
60.0K
01:33Cleavage and Blastulation
44.5K
After a large-single-celled zygote is produced via fertilization, the process of cleavage occurs while zygotes travel through the uterine tube. Cleavage is a mitotic cell division that does not result in growth. With each round of successive cell division, daughter cells get increasingly smaller.
44.5K
02:39The Angiosperm Life Cycle
64.0K
Plants have a life cycle split between two multicellular stages: a haploid stage—with cells containing one set of chromosomes—and a diploid stage—with cells containing two sets of chromosomes. The haploid stage is the gamete-producing gametophyte, and the diploid stage is the spore-producing sporophyte.
64.0K
03:24Seedless Vascular Plants
59.2K
Seedless Vascular Plants Were the First Tall Plants on Earth
59.2K