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Lateral Root Inducible System in Arabidopsis and Maize
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Abscisic acid distribution in horizontal maize root segments.

P E Pilet1, L Rivier

  • 1Institut de Biologie et de Physiologie Végétales, Université de Lausanne, 6 Place de la Riponne, CH-1005, Lausanne, Switzerland.

Planta
|November 27, 2013
PubMed
Summary

Endogenous abscisic acid (ABA) distribution becomes asymmetric in horizontal corn roots, with more ABA on the lower side. This finding reveals ABA

Area of Science:

  • Plant biology
  • Plant physiology
  • Root gravitropism

Background:

  • Plant roots exhibit gravitropism, orienting growth with gravity.
  • Hormonal regulation plays a crucial role in plant growth responses.

Purpose of the Study:

  • To investigate the distribution of endogenous abscisic acid (ABA) in Zea mays roots during gravitropism.
  • To determine if ABA asymmetry correlates with the gravitropic response in corn roots.

Main Methods:

  • Gas chromatography-mass spectrometry (GC/MS) for analyzing ABA levels.
  • Gravitropic stimulation of horizontal Zea mays (cv. LG 11) roots.
  • Analysis of ABA in different root zones, including half-decapped roots.

Main Results:

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  • Endogenous abscisic acid (ABA) shows asymmetric distribution in the elongation zone of horizontal corn roots.
  • ABA levels increase in the lower half and decrease in the upper half of gravitropically responding roots.
  • Asymmetric ABA distribution is also observed in half-decapped roots, suggesting a role in gravitropism.

Conclusions:

  • Asymmetric distribution of abscisic acid is a key factor in the positive gravitropic response of Zea mays roots.
  • ABA's role in root gravitropism warrants further investigation, particularly in relation to root cap function.