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相关概念视频

Biological Clocks and Seasonal Responses02:45

Biological Clocks and Seasonal Responses

34.7K
The circadian—or biological—clock is an intrinsic, timekeeping, molecular mechanism that allows plants to coordinate physiological activities over 24-hour cycles called circadian rhythms. Photoperiodism is a collective term for the biological responses of plants to variations in the relative lengths of dark and light periods. The period of light-exposure is called the photoperiod.
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Circadian Rhythms and Gene Regulation02:19

Circadian Rhythms and Gene Regulation

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The biological clock is involved in many aspects of regulating complex physiology in all animals. It was in 1935 when German zoologists, Hans Kalmus and Erwin Bünning, discovered the existence of circadian rhythm in Drosophila melanogaster. However, the internal molecular mechanisms behind the circadian clock remained a mystery until 1984, when Jeffrey C. Hall, Michael Rosbash, and Michael W. Young discovered the expression of the Per gene oscillating over a 24-hour cycle. In subsequent...
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Cell Signaling in Plants01:25

Cell Signaling in Plants

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Plant cells communicate to coordinate their cycle of growth, flowering and fruiting, and activities in roots, shoots, and leaves in response to the changing environmental conditions. Plant signaling is distinct from animal signaling. Plants primarily utilize enzyme-linked receptors, whereas the largest class of cell-surface receptors in animals are G-protein coupled receptors (GPCRs). Unlike animals, receptor tyrosine kinases are rare in plants. Instead, plants have a diverse class of...
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Photoreceptors and Plant Responses to Light02:00

Photoreceptors and Plant Responses to Light

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Light plays a significant role in regulating the growth and development of plants. In addition to providing energy for photosynthesis, light provides other important cues to regulate a range of developmental and physiological responses in plants.
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Transcription01:10

Transcription

147.1K
Overview
Transcription is the process of synthesizing RNA from a DNA sequence by RNA polymerase. It is the first step in producing a protein from a gene sequence. Additionally, many other proteins and regulatory sequences are involved in the proper synthesis of messenger RNA (mRNA). Regulation of transcription is responsible for the differentiation of all the different types of cells and often for the proper cellular response to environmental signals.
Transcription Can Produce Different Kinds...
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Position-effect Variegation02:32

Position-effect Variegation

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In 1928, a German botanist Emil Heitz observed the moss nuclei with a DNA binding dye. He observed that while some chromatin regions decondense and spread out in the interphase nucleus, others do not. He termed them euchromatin and heterochromatin, respectively. He proposed that the heterochromatin regions reflect a functionally inactive state of the genome. It was later confirmed that heterochromatin is transcriptionally repressed, and euchromatin is transcriptionally active chromatin.
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相关实验视频

Updated: Jul 15, 2025

Rapid Analysis of Circadian Phenotypes in Arabidopsis Protoplasts Transfected with a Luminescent Clock Reporter
07:42

Rapid Analysis of Circadian Phenotypes in Arabidopsis Protoplasts Transfected with a Luminescent Clock Reporter

Published on: September 17, 2016

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植物的进化表观遗传钟

N Yao1, Z Zhang2, L Yu3

  • 1Department of Genetics, University of Georgia, Athens, GA, USA.

Science (New York, N.Y.)
|September 28, 2023
PubMed
概括
此摘要是机器生成的。

一个新的"表皮表"使用DNA甲基化变化来确定植物在几年或几个世纪的进化日期,比传统的分子表更快. 这种方法准确地重建了植物家族树,为生物多样性研究提供了新的工具.

更多相关视频

Chromatin Immunoprecipitation Assay for the Identification of Arabidopsis Protein-DNA Interactions In Vivo
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Chromatin Immunoprecipitation Assay for the Identification of Arabidopsis Protein-DNA Interactions In Vivo

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

Published on: June 7, 2013

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相关实验视频

Last Updated: Jul 15, 2025

Rapid Analysis of Circadian Phenotypes in Arabidopsis Protoplasts Transfected with a Luminescent Clock Reporter
07:42

Rapid Analysis of Circadian Phenotypes in Arabidopsis Protoplasts Transfected with a Luminescent Clock Reporter

Published on: September 17, 2016

12.9K
Chromatin Immunoprecipitation Assay for the Identification of Arabidopsis Protein-DNA Interactions In Vivo
12:36

Chromatin Immunoprecipitation Assay for the Identification of Arabidopsis Protein-DNA Interactions In Vivo

Published on: January 14, 2016

20.5K
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

17.8K

科学领域:

  • 进化生物学
  • 基因组学
  • 表观遗传学

背景情况:

  • 基于DNA序列的分子时钟对于宏观进化约会至关重要,但对于最近的进化历史来说太慢了.
  • 经典的DNA时钟运行在10~8年的时间尺度上,限制了它们对最近的多样化事件的有用性.

研究的目的:

  • 基于DNA甲基化变化的新型高分辨率分子时钟.
  • 为了证明这种"表皮表"的实用性,用于重建最近的植物谱系.

主要方法:

  • 研究了植物基因组中的特定细胞因子的随机DNA甲基化变化.
  • 开发并应用了"表皮表表"用于几年到几个世纪的基因测年.
  • 实验证实了该时钟的准确性,使用了Arabidopsis thaliana和Zostera marina.

主要成果:

  • DNA甲基化变化表现出类似时钟的行为,比基于DNA的时钟更快.
  • 进化时钟成功地总结了已知的物种内遗传树和分歧时间.
  • 在自肥植物 (*Arabidopsis thaliana*) 和克隆植物 (*Zostera marina*) 中得到验证.

结论:

  • 进化时钟为植物进化中的高分辨率时间研究提供了一个强大的新工具.
  • 这一发现为探索近期植物生物多样性和进化动态开辟了道路.
  • 表观遗传变化提供了更快,更精确的植物遗传分析方法.