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Related Experiment Video

Updated: Dec 15, 2025

A Contrast of Three Inoculation Techniques used to Determine the Race of Unknown Fusarium oxysporum f.sp. niveum Isolates
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Caulonema differentiation in Funaria protonema.

Man-Mohan Johri1

  • 1Tata Institute of Fundamental Research, Department of Biological Sciences, Mumbai, India. mjohri06915@yahoo.co.in.

The International Journal of Developmental Biology
|July 14, 2020
PubMed
Summary

Auxin (indole acetic acid) significantly influences caulonema differentiation in the moss Funaria hygrometrica. Optimal conditions, including pH and nutrient levels, enhance auxin

Area of Science:

  • Plant developmental biology
  • Moss protonema differentiation
  • Plant hormone signaling

Background:

  • Cell differentiation in moss protonema is regulated by environmental factors.
  • Auxin, a plant hormone, is known to play a role in plant development.
  • Previous research suggests auxin's involvement in caulonema differentiation in other moss species.

Purpose of the Study:

  • To investigate the role of auxin in caulonema differentiation in Funaria hygrometrica protonema.
  • To determine optimal conditions for auxin-induced caulonema differentiation.
  • To explore the relationship between auxin concentration, pH, and nutrient availability.

Main Methods:

  • Stationary suspension cultures of Funaria hygrometrica protonema.
  • Manipulation of inoculum cell density and indole acetic acid (IAA) concentration.

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  • Culturing in media buffered at specific pH levels and varying nutrient availability.

    • Main Results:

    • Indole acetic acid (IAA) at 2-5 µM induced 65-70% caulonema differentiation in 5-6 days at low cell densities.
    • Caulonema differentiation occurred in auxin-free medium buffered at pH 5.0 after a lag period.
    • Nutrient-limited medium buffered at pH 5.0 with 3 µM IAA enhanced differentiation to 75-80% within 3-4 days.

    Conclusions:

    • Auxin is a key regulator of caulonema differentiation in Funaria hygrometrica.
    • pH and nutrient availability modulate the sensitivity of protonema cells to auxin.
    • Findings align with auxin's role in regulating transcription factors in other moss species.