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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.
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High-Resolution Kinematic Analysis of Root Gravitropic Bending Using RootPlot.

Aditi Bhat1, Cody L DePew1, Gabriele B Monshausen2

  • 1Department of Biology, Pennsylvania State University, University Park, PA, USA.

Methods in Molecular Biology (Clifton, N.J.)
|October 14, 2021
PubMed
Summary
This summary is machine-generated.

Understanding root gravitropism requires detailed growth analysis. This study introduces a new method and software (RootPlot) to visualize root growth kinetics and spatial distribution during bending, aiding genetic dissection of this complex process.

Keywords:
GravitropismKinematic analysis of growthRelative elemental growth rateRoot growth

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Area of Science:

  • Plant Biology
  • Developmental Biology
  • Biophysics

Background:

  • Root gravitropism, the bending of roots in response to gravity, is crucial for plant adaptation.
  • This process involves differential cell expansion on opposite sides of the root.
  • Dissecting the molecular mechanisms requires precise measurement of growth kinetics and spatial distribution.

Purpose of the Study:

  • To develop an experimental workflow for high spatiotemporal resolution imaging of root growth.
  • To create a method for converting 2D cellular marker data into 3D root growth profiles.
  • To introduce RootPlot, a custom R-based program for analyzing root growth and bending rates.

Main Methods:

  • High-resolution imaging of vertically oriented roots before and after gravistimulation.
  • Utilizing existing image processing software to obtain root cellular marker XY-coordinates.
  • Developing and applying the RootPlot program for calculating velocity profiles, relative elemental growth rates (REGR), and fitting data using LOWESS regression.
  • Visualizing growth data using heatmaps and analyzing overall growth and bending rates.

Main Results:

  • A detailed experimental setup for monitoring root gravitropism is presented.
  • The RootPlot software enables calculation of root velocity and REGR from imaging data.
  • Heatmaps effectively visualize the spatial and temporal contribution of different root regions to the gravitropic response.
  • Analysis of overall growth and bending rates is facilitated by the developed workflow.

Conclusions:

  • The developed workflow and RootPlot software provide a powerful tool for quantitative analysis of root gravitropism.
  • This approach allows for a deeper understanding of the kinetics and spatial dynamics of root bending.
  • The findings will aid in the genetic dissection of the molecular machinery underlying root gravitropic responses.