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相关概念视频

C4 Pathway and CAM01:27

C4 Pathway and CAM

Most plants use the C3 pathway for carbon fixation. However, some plants, such as sugar cane, corn, and cacti that grow in hot conditions, use alternative pathways to fix carbon and conserve energy loss due to photorespiration. Photorespiration is the process that occurs when the oxygen concentration is high. Under such conditions, the rubisco enzyme in the Calvin cycle binds O2 instead of CO2, which halts photosynthesis and consumes energy.
C4 Pathway
The C4 pathway is used by plants such as...
Introduction to Plant Diversity02:22

Introduction to Plant Diversity

From Water to Land
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 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.
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.

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相关实验视频

Updated: Jul 19, 2026

Use of Arabidopsis eceriferum Mutants to Explore Plant Cuticle Biosynthesis
11:02

Use of Arabidopsis eceriferum Mutants to Explore Plant Cuticle Biosynthesis

Published on: May 31, 2008

伦卡里亚 (Runcaria) 是一个中代沃纪的种子植物前体.

P Gerrienne1, B Meyer-Berthaud, M Fairon-Demaret

  • 1Département de Géologie, B18, Université de Liège, Sart Tilman, Liège 1, Belgique. p.gerrienne@ulg.ac.be

Science (New York, N.Y.)
|October 30, 2004
PubMed
概括

化石Runcaria是来自比利时的3.85亿年前的种子前体,比最早的种子早2000万年. 这一发现揭示了对种子植物进化起源的关键见解.

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:

  • 种子习惯是中古时代的一个主要进化创新.
  • 种子植物代表了当今最多样化的植物谱系,有超过25万种现存物种.

研究的目的:

  • 为了研究种子植物的早期进化.
  • 识别和描述已知的早期种子之前的潜在种子前体.

主要方法:

  • 来自比利时的化石标本的古植物学分析.
  • 对Runcaria进行了形态检查,重点关注其生殖结构.

主要成果:

  • 识别Runcaria,一个中期Givetian (38500万年前) 化石.
  • 朗卡里亚被描述为一个半径对称的,带有体的大胞体,有一个圆顶和一个远端延伸.
  • 这种前体比最早的确定的种子早约2000万年.

结论:

  • Runcaria为种子形成的进化途径提供了关键证据.
  • 伦卡利亚的形态,包括其远端延伸,表明它在无菌授粉中发挥了作用.

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A PCR-based Genotyping Method to Distinguish Between Wild-type and Ornamental Varieties of Imperata cylindrica
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A PCR-based Genotyping Method to Distinguish Between Wild-type and Ornamental Varieties of Imperata cylindrica

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Efficient Regeneration-based Agrobacterium-Mediated Transformation of an Asexual Amphibious Brassicaceae Species, Rorippa aquatica
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Efficient Regeneration-based Agrobacterium-Mediated Transformation of an Asexual Amphibious Brassicaceae Species, Rorippa aquatica

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Use of Arabidopsis eceriferum Mutants to Explore Plant Cuticle Biosynthesis

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A PCR-based Genotyping Method to Distinguish Between Wild-type and Ornamental Varieties of Imperata cylindrica
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A PCR-based Genotyping Method to Distinguish Between Wild-type and Ornamental Varieties of Imperata cylindrica

Published on: February 20, 2012

Efficient Regeneration-based Agrobacterium-Mediated Transformation of an Asexual Amphibious Brassicaceae Species, Rorippa aquatica
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Efficient Regeneration-based Agrobacterium-Mediated Transformation of an Asexual Amphibious Brassicaceae Species, Rorippa aquatica

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  • 这一发现显著提升了我们对导致种子习惯的性格获取序列的理解.