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関連する概念動画

Formation of Species01:31

Formation of Species

Speciation describes the formation of one or more new species from one or sometimes multiple original species. The resulting species are discrete from the parent species, and barriers to reproduction will typically exist. There are two primary mechanisms, speciation with and without geographic isolation—allopatric and sympatric speciation, respectively.Allopatric SpeciationIn allopatric speciation, gene flow between two populations of the same species is prevented by a geographic barrier, like...
Genetics of Speciation02:16

Genetics of Speciation

Speciation is the evolutionary process resulting in the formation of new, distinct species—groups of reproductively isolated populations.The genetics of speciation involves the different traits or isolating mechanisms preventing gene exchange, leading to reproductive isolation. Reproductive isolation can be due to reproductive barriers that have effects either before or after the formation of a zygote. Pre-zygotic mechanisms prevent fertilization from occurring, and post-zygotic mechanisms...
Speciation Rates01:07

Speciation Rates

Speciation can proceed at markedly different rates, and evolutionary biologists commonly describe these differences through the models of gradualism and punctuated equilibrium. Both patterns explain how new species arise, but they differ in the tempo and continuity of evolutionary change. In both cases, evolutionary change arises from heritable variation within populations, with natural selection often shaping traits that improve survival and reproduction under specific environmental conditions.
Introduction to Plant Diversity02:22

Introduction to Plant Diversity

From Water to Land
Understanding Species and Reproductive Barriers01:17

Understanding Species and Reproductive Barriers

A species is a group of organisms that interbreed and produce fertile offspring. Typically, individuals of the same species appear similar and share common characteristics due to their highly similar genomes. However, not all organisms that look alike are members of the same species. Various mechanisms keep most species discrete. While some mechanisms prevent reproductive behavior and fertilization (pre-zygotic isolation), others prevent the production of fertile offspring after mating has...
Seedless Vascular Plants03:24

Seedless Vascular Plants

Seedless Vascular Plants Were the First Tall Plants on Earth

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関連する実験動画

Updated: Jul 13, 2026

Non-radioactive in situ Hybridization Protocol Applicable for Norway Spruce and a Range of Plant Species
11:56

Non-radioactive in situ Hybridization Protocol Applicable for Norway Spruce and a Range of Plant Species

Published on: April 17, 2009

植物種の分類 植物種の分類

Loren H Rieseberg1, John H Willis

  • 1Department of Botany, University of British Columbia, Vancouver, BC V6T 1Z4, Canada. Lriesebe@interchange.ubc.ca

Science (New York, N.Y.)
|August 19, 2007
PubMed
まとめ

植物の種化には,遺伝子フローに対する障壁が含まれるが,プリジゴティックな障壁が鍵となる. ポストジゴティック・バリアとポリプロイド・スペシエーション・ドライバーの理解は,植物多様性にとって極めて重要です.

科学分野:

  • 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
  • 遺伝学 遺伝学とは

背景:

  • 植物種の発生は,動物種の発生と同様に,集団間の遺伝子交換の障壁を進化させることを含む.
  • プレジゴティック・バリア (交配/受精を阻害する) は,一般に,植物生殖隔離において,ポストジゴティック・バリア (ハイブリッドに対する選択) よりも有意である.
  • 生態学的要因 (受粉者,生息地) に起因する適応的分岐は,通常,生殖前のバリアを形成する.

研究 の 目的:

  • 植物種の種化における固有のポスチゴティック・バリアを駆動する進化的力を探求する.
  • 植物におけるポリプロイド種の高頻度に寄与する要因を理解する.
  • 植物種の豊かさと,様々な生物学的/地史学的要因との関係を調査する.

主な方法:

  • この研究は,植物の種化メカニズムに関する既存の研究を統合したものです.
  • 生殖分離におけるプレジゴティック・バリアとポストジゴティック・バリアの役割を分析しています.
  • ポリプロイドの種化と種豊かさに関連した特徴を調べています.

主要な成果:

  • 固有のポスチゴティック・バリアの進化的原動力はほとんど不明であり,しばしば不適合性の要因のポリモルフィズムにつながります.

さらに関連する動画

Laser-assisted Microdissection (LAM) as a Tool for Transcriptional Profiling of Individual Cell Types
09:31

Laser-assisted Microdissection (LAM) as a Tool for Transcriptional Profiling of Individual Cell Types

Published on: May 10, 2016

Experimental Protocol for Manipulating Plant-induced Soil Heterogeneity
08:16

Experimental Protocol for Manipulating Plant-induced Soil Heterogeneity

Published on: March 13, 2014

関連する実験動画

Last Updated: Jul 13, 2026

Non-radioactive in situ Hybridization Protocol Applicable for Norway Spruce and a Range of Plant Species
11:56

Non-radioactive in situ Hybridization Protocol Applicable for Norway Spruce and a Range of Plant Species

Published on: April 17, 2009

Laser-assisted Microdissection (LAM) as a Tool for Transcriptional Profiling of Individual Cell Types
09:31

Laser-assisted Microdissection (LAM) as a Tool for Transcriptional Profiling of Individual Cell Types

Published on: May 10, 2016

Experimental Protocol for Manipulating Plant-induced Soil Heterogeneity
08:16

Experimental Protocol for Manipulating Plant-induced Soil Heterogeneity

Published on: March 13, 2014

  • ポリプロイドの種化は植物の中で頻繁に見られ,これは生態学的差異化,分散,生殖能力,生命史,生殖戦略に起因する可能性がある.
  • 植物種の豊かさは,生態学的機会を高める要因と相関しています.

    • 結論:

    • 植物生殖的隔離には,生態学的適応によって引き起こされるプレジゴティックバリアが支配的な役割を果たします.
    • ポリプロイディは,特定の生命史の特徴によって促進される,重要な植物種の形態です.
    • 生態学的機会は,植物で観察される高種の豊かさと密接に関連しています.