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相关概念视频

Plant Breeding and Biotechnology01:59

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Crop cultivation has a long history in human civilization, with records showing the cultivation of cereal plants beginning at around 8000 BC. This early plant breeding was developed primarily to provide a steady supply of food.
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Some of Mendel’s crosses examined three pairs of contrasting characteristics. Such a cross is called a trihybrid cross. A trihybrid cross is a combination of three individual monohybrid crosses. For example, plant height (tall vs. short), seed shape (round vs. wrinkled), and seed color (yellow vs. green).
The F1 generation plants of a trihybrid cross are heterozygous for all three traits and produce eight gametes. Upon self-fertilization, these gametes have an equal...
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Transcription

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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.
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种群转录组和表型分析显示,Rht-D1b为现代面包小麦提供了更大的苗根.

Xiaoming Wang1,2, Peng Zhao1, Xue Shi1

  • 1State Key Laboratory for Crop Stress Resistance and High-Efficiency Production, College of Agronomy, Northwest A&F University, Yangling, Shaanxi 712100, China.

The Plant cell
|November 8, 2025
PubMed
概括

绿色革命 (GR) 显著改变了小麦的根系. 一个特定的GR等位基因,Rht-D1b,通过增加细胞大小和水系活动,增强了现代品种的苗木根生长.

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科学领域:

  • 植物遗传学 植物遗传学
  • 农业科学 农业科学
  • 植物生理学作物生理学

背景情况:

  • 绿色革命 (GR) 提高了小麦产量,但其对根系的影响尚不清楚.
  • 了解GR对小麦根结构的影响对于作物改进至关重要.

研究的目的:

  • 调查GR如何影响小麦 (Triticum aestivum L.) 根系.
  • 为了确定对GR驱动的根系变化负责的遗传因素.

主要方法:

  • 406个小麦加入的大规模转录和表型分析.
  • 土地品种和现代品种的比较,以确定与GR相关的特征.

主要成果:

  • 在现代品种中,GR等位基因降低高度 (Rht) -D1b通过增强细胞长度和 меристем大小,显著增加了幼苗根大小.
  • Rht-D1b对根系的影响与TaRht-D1.1b的转化重新启动有关.
  • 与Rht-D1b不同,Rht-B1b等位基因对根特征没有显著影响,尽管对植物高度有类似的影响.

结论:

  • 在现代小麦品种中,Rht-D1b等位基因赋予了更大的根芽比率,这是绿色革命的一个被忽视的好处.
  • 这些发现为利用GR等位基因来改善小麦的种子根系提供了洞察力.