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相关概念视频

Water and Mineral Acquisition02:34

Water and Mineral Acquisition

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Specialized tissues in plant roots have evolved to capture water, minerals, and some ions from the soil. Roots exhibit a variety of branching patterns that facilitate this process. The outermost root cells have specialized structures called root hairs that increase the root surface, thus increasing soil contact. Water can passively cross into roots, as the concentration of water in the soil is higher than that of the root tissue. Minerals, in contrast, are actively transported into root cells.
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Responses to Gravity and Touch02:26

Responses to Gravity and Touch

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Gravitropism: Plant Responses to Gravity
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Primary and Secondary Growth in Roots and Shoots03:02

Primary and Secondary Growth in Roots and Shoots

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Vascular plants, which account for over 90% of the Earth’s vegetation, all undergo primary growth—which lengthens roots and shoots. Many land plants, notably woody plants, also undergo secondary growth—which thickens roots and shoots.
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Construction of Root Locus01:15

Construction of Root Locus

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The construction of a root locus involves several key steps to analyze and visualize the behavior of a system's poles with varying gain. The number of branches in the root locus equals the number of closed-loop poles and is symmetrical about the real axis.
For positive gain values, the root locus exists on the real axis to the left of an odd number of finite open-loop poles or zeros. The root locus starts at the open-loop poles and traces the paths of the closed-loop poles as the gain...
189
Properties of the Root Locus01:05

Properties of the Root Locus

172
The root locus method is an invaluable tool for analyzing higher-order systems without needing to factor the denominator of the transfer function. A pole of the system is identified when the characteristic polynomial in the transfer function's denominator equals zero.
To determine if a point lies on the root locus, the criterion involves the sum of angles contributed by all poles and zeros to that point. Specifically, this sum must be an odd multiple of 180 degrees. The gain at any point on...
172
Plotting and Calibrating the Root Locus01:19

Plotting and Calibrating the Root Locus

192
Root loci often diverge as system poles shift from the real axis to the complex plane. Key points in this transition are the breakaway and break-in points, indicating where the root locus leaves and reenters the real axis. The branches of the root locus form an angle of 180/n degrees with the real axis, where n is the number of branches at a breakaway or break-in point.
The maximum gain occurs at the breakaway points between open-loop poles on the real axis, while the minimum gain is...
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相关实验视频

Updated: Oct 1, 2025

Lateral Root Inducible System in Arabidopsis and Maize
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一个保存的超位调节地面和地下根的启动

Moutasem Omary1, Naama Gil-Yarom1, Chen Yahav1

  • 1The Institute of Plant Science and Genetics in Agriculture, Faculty of Agriculture, The Hebrew University of Jerusalem, Rehovot, Israel.

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概括
此摘要是机器生成的。

植物可以从芽生长出根, 不仅仅是在地下. 一项新的研究揭示了一个关键的基因SHOOTBORNE ROOTLESS (SBRL) 控制了这一过程,

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Poplar Adventitious Roots Induced by Stem Canker Pathogens: An Experimental System for Studying Roots Biology and Light Response-Related Processes
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An Optimized Rhizobox Protocol to Visualize Root Growth and Responsiveness to Localized Nutrients
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相关实验视频

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科学领域:

  • 植物生物学
  • 发育生物学
  • 遗传学

背景情况:

  • 植物在器官形成方面表现出了显著的可塑性,
  • 虽然侧根在地下发育,但发芽根形成的机制尚不清楚.

研究的目的:

  • 阐明西红 (Solanum lycopersicum) 发芽根的细胞和分子机制.
  • 确定调节这种独特发育途径的关键遗传因素.

主要方法:

  • 用单细胞绘制西红发芽的根部发育图.
  • 一种新型转录因子SHOOTBORNE ROOTLESS (SBRL) 的鉴定和表征.
  • 对SBRL及其类型的进化分析.

主要成果:

  • 发芽根源于通过明显的过渡状态与花皮相关的细胞.
  • 转录因子SBRL对于激活这种过渡状态至关重要.
  • SBRL的功能和调节元素在血管苗中保留,并参与其他根形成过程.

结论:

  • 植物根系的可塑性是由SBRL等特定环境因素调节的保存过渡状态.
  • 了解SBRL可以了解根部发育和器官生成的演变.