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Related Concept Videos

Primary and Secondary Growth in Roots and Shoots03:02

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Related Experiment Video

Updated: Jun 19, 2026

Plant Promoter Analysis: Identification and Characterization of Root Nodule Specific Promoter in the Common Bean
10:58

Plant Promoter Analysis: Identification and Characterization of Root Nodule Specific Promoter in the Common Bean

Published on: December 23, 2017

"GROWTH-PROMOTING SUBSTANCE" AND ELONGATION OF ROOTS.

A E Navez1

  • 1Laboratory of General Physiology, Harvard University, Cambridge.

The Journal of General Physiology
|October 30, 2009
PubMed
Summary
This summary is machine-generated.

Root decapitation halts elongation, with regrowth occurring at a reduced rate. Coleoptile and root tip diffusates inhibit this regrowth, suggesting a growth-inhibiting substance in these tips.

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Area of Science:

  • Plant biology
  • Developmental biology
  • Plant physiology

Background:

  • Normal root elongation in Lupinus seedlings occurs at a consistent rate.
  • Root decapitation temporarily halts elongation, followed by regrowth at a diminished rate.

Purpose of the Study:

  • To investigate the effect of root tip removal and subsequent application of diffusates on root elongation.
  • To identify potential inhibitory substances affecting root growth.

Main Methods:

  • Decapitation of Lupinus seedling roots.
  • Application of diffusates from coleoptile tips (Zea, Avena) and root tips to decapitated roots.
  • Measurement of root elongation rates.

Main Results:

  • Decapitation of roots led to a temporary cessation of elongation, followed by slower regrowth.
  • Diffusates from coleoptile tips significantly decreased the elongation rate of decapitated roots.
  • Diffusates from root tips showed a lesser inhibitory effect compared to coleoptile tips.
  • The lower half of a horizontally placed coleoptile tip diffusate caused more pronounced inhibition than the upper half.

Conclusions:

  • A growth-inhibiting substance present in coleoptile and root tips appears to reduce the elongation rate of decapitated roots.
  • This substance plays a role in regulating root growth, particularly after injury.