Jove
Visualize
联系我们

相关概念视频

Pollination and Flower Structure02:40

Pollination and Flower Structure

Flowers are the reproductive, seed-producing structures of angiosperms. Typically, flowers consist of sepals, petals, stamens, and carpels. Sepals and petals are the vegetative flower organs. Stamens and carpels are the reproductive organs.
Non-vascular Seedless Plants02:26

Non-vascular Seedless Plants

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.
Introduction to Plant Diversity02:22

Introduction to Plant Diversity

From Water to Land
Introduction to Seed Plants03:40

Introduction to Seed Plants

Most plants are seed plants—characterized by seeds, pollen, and reduced gametophytes. Seed plants include gymnosperms and angiosperms.
Lampbrush Chromosomes01:51

Lampbrush Chromosomes

In 1882, Flemming observed lampbrush chromosomes (LBC) in salamander eggs. Later in 1892, Rückert observed LBCs in shark egg cells and coined the term "lampbrush chromosomes" because they looked like brushes used to clean kerosene lamps.
LBCs are made up of two pairs of conjugating homologous chromatids. Each chromatid consists of alternatively positioned regions of condensed-inactive chromatin and loosely placed-active side loops, which can be contracted and extended. The loops resemble the...
The Angiosperm Life Cycle02:39

The Angiosperm Life Cycle

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.

您也可能阅读

相关文章

通过共同作者、期刊和引用图与本文相关的文章。

排序
Same author

Estimation of temperature and precipitation from morphological characters of dicotyledonous leaves.

American journal of botany·2011
Same author

Life in the end-Permian dead zone.

Proceedings of the National Academy of Sciences of the United States of America·2001
Same author

The delayed resurgence of equatorial forests after the permian-triassic ecologic crisis.

Proceedings of the National Academy of Sciences of the United States of America·1999
Same author

A natural experiment on plant acclimation: lifetime stomatal frequency response of an individual tree to annual atmospheric CO2 increase.

Proceedings of the National Academy of Sciences of the United States of America·1996
Same author

Zoidogamy in fossil gymnosperms: The centenary of a concept, with special reference to prepollen of late Paleozoic conifers.

Proceedings of the National Academy of Sciences of the United States of America·1996
Same author

The terminal Paleozoic fungal event: evidence of terrestrial ecosystem destabilization and collapse.

Proceedings of the National Academy of Sciences of the United States of America·1996
JoVE
x logofacebook logolinkedin logoyoutube logo
关于 JoVE
概览领导团队博客JoVE 帮助中心
作者
出版流程编辑委员会范围与政策同行评审常见问题投稿
图书馆员
用户评价订阅访问资源图书馆顾问委员会常见问题
研究
JoVE JournalMethods CollectionsJoVE Encyclopedia of Experiments存档
教育
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab Manual教师资源中心教师网站
使用条款与条件
隐私政策
政策

相关实验视频

Updated: Jul 12, 2026

Whole-mount Clearing and Staining of Arabidopsis Flower Organs and Siliques
09:17

Whole-mount Clearing and Staining of Arabidopsis Flower Organs and Siliques

Published on: April 12, 2018

古老的双性恋花朵 古老的双性恋花朵

J F Basinger, D L Dilcher

    Science (New York, N.Y.)
    |May 4, 1984
    PubMed
    概括

    来自达科他群的化石花朵揭示了早期的双性花的进化. 这些9400万年前的化石显示出独特的特征,挑战了当前的植物分类,并突出了昆虫授粉适应的特征.

    科学领域:

    • 古植物学是古植物学.
    • 进化生物学 进化生物学
    • 血管精植物古生物学

    背景情况:

    • 化石花提供了关键的洞察力,对血管苗的进化.
    • 了解早期的花多样性是重建植物进化历史的关键.
    • 达科他群是白时期植物化石的重要来源.

    研究的目的:

    • 描述和分类一个新发现的化石花从达科他州的形成.
    • 为了研究这个古老的花的系统位置和进化意义.
    • 分析花形态和花粉特征,以获得植物遗传学见解.

    主要方法:

    • 化石花结构的详细形态分析.
    • 对花粉颗粒进行显微镜检查,以检查诊断特征.
    • 与现存和化石血管精子种群的类别进行比较分析.

    主要成果:

    • 发现保存良好,中等尺寸的双性恋花,可以追溯到9400万年前.
    • 识别鲜明的花朵部分,包括花,花,花茎,合的,和一个容器盘.
    • 对花粉的分析显示了小的三角形粒,表明昆虫授粉.
    • 化石花表现出独特的特征组合,不适合任何单一的现存秩序.

    更多相关视频

    Field Experiments of Pollination Ecology: The Case of Lycoris sanguinea var. sanguinea
    07:19

    Field Experiments of Pollination Ecology: The Case of Lycoris sanguinea var. sanguinea

    Published on: November 25, 2016

    A Rapid Method to Confine and Safely Handle Bees in the Field
    03:44

    A Rapid Method to Confine and Safely Handle Bees in the Field

    Published on: August 23, 2024

    相关实验视频

    Last Updated: Jul 12, 2026

    Whole-mount Clearing and Staining of Arabidopsis Flower Organs and Siliques
    09:17

    Whole-mount Clearing and Staining of Arabidopsis Flower Organs and Siliques

    Published on: April 12, 2018

    Field Experiments of Pollination Ecology: The Case of Lycoris sanguinea var. sanguinea
    07:19

    Field Experiments of Pollination Ecology: The Case of Lycoris sanguinea var. sanguinea

    Published on: November 25, 2016

    A Rapid Method to Confine and Safely Handle Bees in the Field
    03:44

    A Rapid Method to Confine and Safely Handle Bees in the Field

    Published on: August 23, 2024

    结论:

    • 这种化石花代表了双性异性芽种的早期例子.
    • 它的独特特征需要重新评估开花植物的分类和进化.
    • 这些发现强调了化石证据对于理解植物谱系多样化的重要性.