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相关概念视频

Seed Structure and Early Development of the Sporophyte02:33

Seed Structure and Early Development of the Sporophyte

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.
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.
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.
Seedless Vascular Plants03:24

Seedless Vascular Plants

Seedless Vascular Plants Were the First Tall Plants on Earth
Introduction to Plant Diversity02:22

Introduction to Plant Diversity

From Water to Land
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.

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相关实验视频

Updated: Jul 11, 2026

Protocols for Obtaining Zygotic and Somatic Embryos for Studying the Regulation of Early Embryo Development in the Model Legume Medicago truncatula
07:32

Protocols 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

带有胚胎的古生物种子.

C N Miller, J T Brown

    Science (New York, N.Y.)
    |January 12, 1973
    PubMed
    概括
    此摘要是机器生成的。

    来自低珀米亚的化石针叶树种子含有已知的最古老的植物胚胎. 它们的发展表明,关键的种子植物胚胎生长模式是由古生物学时代进化.

    更多相关视频

    Efficient and Rapid Isolation of Early-stage Embryos from Arabidopsis thaliana Seeds
    08:05

    Efficient and Rapid Isolation of Early-stage Embryos from Arabidopsis thaliana Seeds

    Published on: June 7, 2013

    A Seed Coat Bedding Assay to Genetically Explore In Vitro How the Endosperm Controls Seed Germination in Arabidopsis thaliana
    08:52

    A Seed Coat Bedding Assay to Genetically Explore In Vitro How the Endosperm Controls Seed Germination in Arabidopsis thaliana

    Published on: November 9, 2013

    相关实验视频

    Last Updated: Jul 11, 2026

    Protocols for Obtaining Zygotic and Somatic Embryos for Studying the Regulation of Early Embryo Development in the Model Legume Medicago truncatula
    07:32

    Protocols 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

    Efficient and Rapid Isolation of Early-stage Embryos from Arabidopsis thaliana Seeds
    08:05

    Efficient and Rapid Isolation of Early-stage Embryos from Arabidopsis thaliana Seeds

    Published on: June 7, 2013

    A Seed Coat Bedding Assay to Genetically Explore In Vitro How the Endosperm Controls Seed Germination in Arabidopsis thaliana
    08:52

    A Seed Coat Bedding Assay to Genetically Explore In Vitro How the Endosperm Controls Seed Germination in Arabidopsis thaliana

    Published on: November 9, 2013

    科学领域:

    • 古植物学是古植物学.
    • 进化生物学 进化生物学
    • 植物科学 植物科学

    背景情况:

    • 种子植物是陆地生态系统中一个关键的进化创新.
    • 了解早期的种子植物进化需要检查生殖结构的化石证据.
    • 波斯纪是早期种子植物多样化的关键时期.

    研究的目的:

    • 报道发现最古老的植物胚胎在化石种子中保存.
    • 分析这些古代胚胎的发育阶段.
    • 确定种子植物中关键胚胎发育模式的进化时间.

    主要方法:

    • 微观检查来自西德克萨斯州下珀米亚河的化石针叶树材料.
    • 化石种子内部内部结构的详细形态分析,重点是胚胎组织.
    • 用现存的种子植物胚胎进行比较的发育分析.

    主要成果:

    • 胚胎组织被鉴定为来自下珀姆河的化石种子.
    • 这些代表了有史以来最古老的科学记录的植物胚胎.
    • 观察到的胚胎发育早于种子分散,表明发育的高级阶段.

    结论:

    • 这一发现大大推迟了植物胚胎的化石记录.
    • 它表明,现代种子植物的特征胚胎发育序列是在古老时代晚期建立的.
    • 这一发现为体的早期进化和多样化提供了关键的见解.