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関連する概念動画

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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関連する実験動画

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

ランカリア (Runcaria) とは,デボニア中期の種子植物前駆体である.

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
まとめ

化石ランカリア (Fossil Runcaria) は,ベルギーの3億8500万年前の種子先駆体であり,最も古い種子より2千万年前のものです. この発見は,種子植物の進化的起源に関する重要な洞察を明らかにします.

科学分野:

  • パレオボタニーは古植物学です.
  • 進化生物学の進化生物学について
  • 植物科学 植物科学について

背景:

  • 種子の習慣は,中古時代の主要な進化的革新であった.
  • 種子植物は現在,25万種以上の種を保有し,最も多様な植物系を代表しています.

研究 の 目的:

  • 種子植物の初期の進化を調査する.
  • 既知の初期種子より前の種子前駆体となる可能性のある種子前駆体を特定し,特徴づけること.

主な方法:

  • ベルギーの化石標本の古植物学分析.
  • ランカリアの形態学的調査,その生殖構造に焦点を当てた.

主要な成果:

  • ランカリア (Runcaria) の識別,ミドルギベチア (38500万年前) の化石.
  • ランカリアは,半径対称で,状のメガスポランジウムで,カプルと遠端の延長がある.
  • この前身は,最古の決定的な種よりも約2千万年前に遡ります.

結論:

  • Runcariaは,種子形成への進化の経路の重要な証拠を提供します.
  • 遠端の延長を含むランカリアの形態学は,アネモフィロスの受粉における役割を示唆しています.

さらに関連する動画

A PCR-based Genotyping Method to Distinguish Between Wild-type and Ornamental Varieties of Imperata cylindrica
12:01

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

Published on: January 16, 2026

関連する実験動画

Last 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

A PCR-based Genotyping Method to Distinguish Between Wild-type and Ornamental Varieties of Imperata cylindrica
12:01

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
06:30

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

Published on: January 16, 2026

  • この発見は,シードハビトにつながるキャラクター獲得のシーケンスに関する私たちの理解を大幅に前進させます.