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Hypolignification: A Decisive Factor in the Development of Hyperhydricity.

Nurashikin Kemat1,2, Richard G F Visser1, Frans A Krens1

  • 1Plant Breeding, Wageningen University and Research, P.O. Box 386, 6700 AJ Wageningen, The Netherlands.

Plants (Basel, Switzerland)
|December 28, 2021
PubMed
Summary
This summary is machine-generated.

Reduced lignin in plants may increase water content, causing hyperhydricity (HH). Applying p-coumaric acid reduced HH symptoms by increasing lignin, suggesting lignin

Keywords:
Arabidopsis thalianaapoplasthyperhydricityhypolignificationmicropropagationp-coumaric acidpiperonylic acid

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Area of Science:

  • Plant Biology
  • Biochemistry

Background:

  • Hyperhydricity (HH) in plants is linked to reduced cell wall lignification (hypolignification).
  • The precise relationship between lignin reduction and HH abnormalities remains unclear.
  • Lignin's hydrophobic nature suggests its reduction may enhance cell wall capillary action and apoplastic water content.

Purpose of the Study:

  • To investigate the role of lignin in the development of hyperhydricity in Arabidopsis thaliana.
  • To determine the effects of exogenous p-coumaric acid on HH symptoms and lignin content.

Main Methods:

  • Utilized wild-type Arabidopsis thaliana (Ler and Col-0) and mutants in cinnamate 4-hydroxylase (C4H) gene (ref3-1, ref3-3).
  • Applied p-coumaric acid exogenously to assess its impact on HH symptoms, root growth, and lignin content.
  • Analyzed phenylpropanoid biosynthesis pathway components.

Main Results:

  • Exogenous p-coumaric acid application decreased HH symptoms in both wild-type and low-lignin mutants.
  • p-coumaric acid inhibited root growth in all tested genotypes.
  • Lignin content was increased by p-coumaric acid treatment in both wild-type and low-lignin mutants.

Conclusions:

  • Lignin plays a significant role in regulating hyperhydricity in Arabidopsis thaliana.
  • Increasing lignin content, via p-coumaric acid application, can mitigate HH symptoms.
  • Further research into lignin's function in plant water relations is warranted.