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Evaluation of the Effect of Growth Factors on Chlorophylls a and b Production from Microalgae
Published on: October 25, 2024
Hormone profiles in microalgae: gibberellins and brassinosteroids.
W A Stirk1, P Bálint, D Tarkowská
1Research Centre for Plant Growth and Development, School of Life Sciences, University of KwaZulu-Natal Pietermaritzburg, P/Bag X01, Scottsville 3209, South Africa. stirk@ukzn.ac.za
Plant Physiology and Biochemistry : PPB
|July 2, 2013
Summary
This study successfully detected gibberellins and brassinosteroids in 24 microalgae strains. Slower-growing microalgae had higher gibberellin levels, with GA6 being the most abundant active gibberellin.
Area of Science:
- Phycology
- Plant Hormones
- Biochemistry
Background:
- Microalgae are diverse photosynthetic organisms with potential industrial applications.
- Plant hormones like gibberellins and brassinosteroids play crucial roles in plant growth and development.
- Previous research has hinted at the presence of brassinosteroids in microalgae, but gibberellins remained largely uninvestigated.
Purpose of the Study:
- To quantify endogenous gibberellins and brassinosteroids in axenic microalgae strains.
- To investigate the relationship between microalgae growth rate and phytohormone content.
- To identify specific gibberellin and brassinosteroid compounds present in microalgae.
Main Methods:
- Culturing of 24 axenic microalgae strains from four classes (Chlorophyceae, Trebouxiophyceae, Ulvophyceae, Charophyceae).
- Quantification of endogenous gibberellins and brassinosteroids using analytical techniques.
- Analysis of hormone concentrations in relation to microalgae growth rates.
Main Results:
- Gibberellins were detected in all 24 microalgae strains for the first time, with concentrations varying significantly.
- Slower-growing strains exhibited higher gibberellin content compared to faster-growing strains.
- Gibberellin A6 (GA6) was the most abundant active gibberellin, with GA13 and GA51 as major end products.
- Brassinosteroids were detected in all strains, with brassinolide generally present at higher concentrations than castasterone.
Conclusions:
- This study provides the first comprehensive report on endogenous gibberellins in microalgae.
- Phytohormone profiles, particularly gibberellins, correlate with microalgae growth rates.
- The findings suggest conserved roles for gibberellins and brassinosteroids in microalgae, similar to higher plants.
Keywords:
ABABLBRsBrassinolideBrassinosteroidsCSCastasteroneDHZEndogenous hormonesGA(6)GAsGibberellinsIAAIAMLODMACCMicroalgaeMosonmagyaróvár Algal Culture CollectionUPLC-MS/MSabscisic acidbrassinolidebrassinosteroidscZcastasteronecis-zeatindihydrozeatingibberellinsiPindole-3-acetamideindole-3-acetic acidisopentenyladeninelimit of detectiontZtrans-zeatinultraperformance tandem mass spectrometry
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